施工技术 2016年4月上 82 CONSTRUCTION TECHNOLOGY 第45卷第7期 D0I:10.7672/8js2016070082 软弱地基堆载预压加固处理分析 李鑫奎，王伟良1，马盛2 (1.上海建工集团股份有限公司，上海201114；2.上海市机械施工集团有限公司，上海200072) [摘要]中国博览会会展综合体室外展场地基天然承载力不能满足使用要求，设计采用堆载预压法对软弱地基进 行处理.施工过程中采取了一系列措施，用以提高预压效果并防止不均匀沉降，同时对预压全程进行了监测，根据 预压效果总结了堆载预压法施工关键点. [关键词]地基；加固；堆载预压；沉降；监测 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2016)07-0082-03 Analysis of Surcharge Preloading Reinforcement of Poor Subgrade Li Xinkui' Wang Weiliang' Ma Sheng? (1.Shanghai Construction Group Co.Lid.Shanghai 201114 China;2.Shanghai Mechanized Construction Group Co.Ltd.Shanghai 200072 China) Abstract:Natural foundation bearing capacity of China Expo Exhibition outdoor exhibition can not meet the requirements design used ballast preloading method for poor subgrade.Construction process has taken a series of measures to improve the effect of preloading and prevents nonuniform settlement preloading monitoring was carried out.According to the effect of preloading this paper summarized the key points of construction. Key words:foundations;strengthening;surcharge preloading;settlement;monitoring 1工程概况 表1土层物理力学性质 中国博览会会展综合体室外展场项目位于上 Table 1 Physical and mechanical properties of soils 海市虹桥商务区规划范围内，设计面积为10万m2 压缩 压缩 黏 内摩 其中7万m2为35kPa荷载使用区，3万m2为50kPa 土层名称 系数/模量/聚力/ 擦角/ MPa-I MPa kPa (°) 荷载使用区，针对50kPa荷载使用区进行堆载预压 ②，粉质黏土 0.38 5.03 15 22.5 处理，设计堆载压力为50kPa 按实际土方密度折算 ②，粉砂 0.15 12.41 0 33.5 堆载高度为3.3m.堆载时间不少于180d 且连续 ③淤泥质粉质黏土 0.79 2.92 13 15.5 ④淤泥质黏土 0.96 2.52 13 12.0 5d实测沉降速率≤1.5mm/d 总沉降量达到400mm ⑤黏土 0.59 3.68 ...
2014年10月上 施工技术 第43卷第19期 CONSTRUCTION TECHNOLOGY 45 D0I:10.7672/5js2014190045 软弱土层基坑水泥搅拌桩止水帷幕失效分析 任志福 (广州航海学院土木工程系，广东广州510725) [摘要]以广州市某基坑工程止水帷幕失效为背景，对软弱土层地质条件下的城市深基坑水泥搅拌桩止水帷幕失 效原因进行了分析.土体中的有机质含量、固化剂的比例及桩体有效入土深度等因素对水泥搅拌桩的成桩质量和 止水效果有较大影响.城市深基坑通常施工场地比较狭窄，基坑的支护结构、电梯井基坑、降水及其他工程对水泥 搅拌桩的施工质量有时也会产生较大影响，因此应做好相应的设计和施工管理工作. [关键词]地下工程；基坑；软弱土层；水泥搅拌桩；止水帷幕 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2014)19-0045-03 The Waterproof Curtain Failure Analysis of Cement Mixing Pile in Soft Soil Foundation Excavation Ren Zhifu (Department of Civil Engineering Guangzhou Maritime Institute Guangzhou Guangdong 510725 China) Abstract:Based on the waterproof curtain failure of a foundation excavation in Guangzhou the failure reasons of cement mixing pile waterproof curtain in soft soil geological conditions of deep foundation excavation in city are analyzed.The content of organic matter soil curing agent ratio and pile effective depth affect the cement mixing pile quality and the water sealing result.Usually the construction site of deep foundation excavation in city is quite narrow the supporting structure elevator excavation and foundation exeavation dewater also affect the quality of cement mixing pile sometimes.The corresponding design and the construction management should be worked well. Key words:underground;foundation excavation soft soil;cement mixing piles;waterproof curtain 0引言 坡顶距离路边线约3m 市政路对面10m处为某厂 城市基坑工程往往受施工场地限制，软弱土层 房；东侧为某花园小区，基坑边线距离小区围墙约 地质条件下水泥搅拌桩止水帷幕的设计和施工管 2.5m 距离小区建筑物边线8.9~25m.基坑总平 理难度更...
[关键调】地下工程；深基坑；软土；支护；快速施工；变形；时空效应 [中图分类号]TU447 [文献标识码]A[文章编号]1002-8498（2013）01-0035-05 Rapid ConstructionMethodof Large AreaDeepFoundationExcavationinSoftSoil Ren Wangdong'，Li Chunguang'，Tian Jianping'，Zheng Gang²，Diao Yu² (1.China Railway Construction Real Estate Group(Tianjin）Co.，Lad.，Tianjin 300000,China; 2.Department of Civil Engineering，Tianjin University，Tianjin 300072,China) Abstract:The rapid construction methods of large area deep foundation excavation in soft soil are applied and developed in Tianjin.These methods include bined retaining pile(wall） and earth berm， bined double-row retaining pile and earth berm, bined double-row retaining pile and single row retaining pile,bined gravity retaining and single row retaining pile.The key respects of these methods include accurate deformation prediction，waterproof curtain，dewatering of earth berm，time- space effect of staged excavation and underground structure construction. Compared with the conventional retaining methods，the rapid retaining methods of large area deep foundation excavation have the advantages of short construction period of underground structure of high-rise building, low cost and less discharge of solid waste produced by the demolish of concrete struts. Key words:underground; deep foundation excavation; soft soil; supports; rapid construction; deformation;time-space effect 在天津、上海等沿海土质较为软弱的地区，一难以根据实际工程需要进行分区开挖，特别是大面 般而言，在基坑周边存在建筑物、道路、地下管线等积基坑中分布有多幢高层建筑时，往往高层建筑的 情况下，由于环境保护的需要，当基坑深度>5～6m施工工期是最重要的。
施工技术 2014年9月下 74 CONSTRUCTION TECHNOLOGY 第43卷第18期 D0I:10.7672/sjs2014180074 软岩隧道衬砌开裂机理分析及预防措施* 李皓晖，虞晓卫2，张旺兴，李涛，余莉1 (1.中国地质大学（武汉）工程学院，湖北武汉430074；2.湖北省谷竹高速公路 建设指挥部，湖北十堰442100) [摘要]衬砌开裂是高速公路隧道重要病害之一，穿越软弱片岩区的某高速公路隧道衬砌开裂现象严重，给隧道的 安全施工与运营带来隐患；以该高速公路上某隧道为研究对象，利用现场监测、勘察资料结合室内试验结果，得出 导致该区域衬砌开裂的主要因素：地下水、软岩蠕变和地形偏压.并依据实例针对性地给出了防治措施，取得了较 好的处理效果. [关键词]隧道工程；公路；衬砌；裂缝；防治 [中图分类号]U457.2 [文献标识码]A [文章编号]1002-8498(2014)18-0074-04 Mechanism Analysis and Prevention Measures About Soft Rock Tunnel Lining Cracking Li Haohui Yu Xiaowei Zhang Wangxing' Li Tao Yu Li (1.Faculty of Engineering China University of Geosciences Wuhan Hubei 430074 China; 2.Hubei Province Guzhu Expressway Construction Command Shiyan Hubei 442100 China) Abstract:Lining cracking is a important disease of highway tunnel.The tunnel in a highway appeared serious lining cracking phenomenon which induced many problems to the safety of the tunnel construction and operation.This article takes a tunnel as study object using the on-site monitoring survey data and the results of laboratory experiments the main factors which caused the lining cracking are put forward including groundwater soft rock creep and terrain bias.Based on some practical examples some control measures are taken and a good treatment effect is obtained. Key words:tunnels;roads;lining;cracks;prevention 0引言 湖北省诸多高速公路隧道穿越这一区域，部分隧道 衬砌开裂是高速公路隧道主要病害之一，对隧 出现了大量衬砌开裂现象，严重地影响了隧道的安 道的施工和运营影响重大，一直是研究的重点. 全施工与运营，而针对软弱片岩区的高速公路隧道 Asakura和Kojima对衬砌的变形机理进行了描 衬砌开裂的研究却较少涉及，且鲜有结合软岩区的 述；王...
[关键词】隧道工程；软岩隧道；超挖；数值模拟；围岩；塑性区 [中图分类号】TU74；U455 [文献标识码】A [文章编号】1002-8498(2013）01-0088-04 Study on the Treatment of Over-break in Soft Rock Tunnel Construction Zhang Xiaoming,Chen Shougen，Huo Xiaolong （MOE Key Laboratory of Transportation Tunnel Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) Abstract:Tunneling in soft rock is featured with large deformation and poor stability. This is especially true when over-break occurs. This paper simulated the tunneling process in soft rock using FLAC3D， and discussed the influence of over-break ,under-break, back-filling with stone ballast and backing with C40 concrete on the tunnel stability. It was found that it is very important to strictly control over-break and when over-break occurs， high strength material should be used for back-filling in dense paction in order to keep the tunnel stability. Key words:tunnels; soft rock tunnel; over-break;simulation;surrounding rocks;plastic zone 1引起超挖的原因及处理现状 4)人为的测量误差、隧道施工中趋于保守的预 1.1超挖原因 留变形量以及施工误差。
施工技术 2013年12月上 78 CONSTRUCTION TECHNOLOGY 第42卷第23期 D01:10.7672/sgj82013230078 软岩隧道大变形机理及支护参数优化分析* 李勇峰12，孙洋1，徐颖，陈建平1 (1.中国地质大学（武汉）工程学院，湖北武汉430074；2.湖北省交通规划设计院，湖北武汉430051) [摘要]谷竹高速公路油坊坪隧道在施工过程中曾多次出现大变形.为了控制变形，确保施工安全，在现场地质调 研和监控量测的基础上，从地质条件、围岩条件、地下水条件、地应力条件以及施工因素等方面分析了大变形机理. 通过现场试验，对不同支护刚度下初支围岩压力、二衬围岩压力以及围岩的变形情况进行分析，结合对监测数据的 分析结果确定了油坊坪隧道合理的支护参数形式. [关键词]隧道工程；软岩隧道；变形；监测；支护；优化 [中图分类号]U451.2 [文献标识码]A [文章编号]1002-8498(2013)23-0078-04 Analysis of Large Deformation Mechanism and Support Parameter Optimization in Soft Rock Tunnel Li Yongfeng.2 Sun Yang' Xu Ying' Chen Jianping' (1.Faculty of Engineering China University of Geosciences Wuhan Hubei 430074 China; 2.Hubei Communications Planning and Design Institute Wuhan Hubei 430051 China) Abstract:The large deformation happened for several times in Youfangping Tunnel of Gucheng-Zhuxi Highway during construction.In order to control deformation and ensure the safety of the construction this paper analyzes the causes of the deformation which es from the geological conditions surrounding rock conditions ground stress conditions construction conditions ete.Based on field investigation and monitoring measurement this paper analyzes the condition of the first lining surrounding rock pressure secondary lining surrounding rock pressure and the deformation for different supporting stiffness.The reasonable supporting parameters form is confirmed based on analyzing monitoring data. Key words:tunnels;soft rock tunnels;deformation;monitoring;suppor...
施工技术 2016年9月上 124 CONSTRUCTION TECHNOLOGY 第45卷第17期 D01:10.7672/8gjs2016170124 软岩大变形隧道变形规律及控制措施 邓启华 (中铁二十二局集团有限公司，北京100043) [摘要]软岩隧道工程地质条件复杂，具有大变形特点，长期以来一直是工程界研究的重点和难点.宝峰隧道穿越 第三纪弱胶结、强风化地层，地下水丰富，多次发生坍塌和突水突泥.根据工程地质勘察、超前地质预报、隧道监控 量测和大量试验结果，将隧道分为浅埋沟壑型、断层破碎带型和炭质泥岩3类，并分别制订施工方案，进行工程应 用和验证，有效控制了隧道变形，取得良好效果. [关键词]隧道工程；软岩隧道；膨胀性；变形；控制方法 [中图分类号]U456 [文献标识码]A [文章编号]1002-8498(2016)17-0124-03 Deformation Law and Control Measures in Soft Rock Tunnel with Large Deformation Deng Qihua China Railway 22nd Bureau Group Go. Lad.Beijing 100043 China) Abstract:Engineering geological conditions of soft rock tunnel with large deformation characteristics are plex which has been the focus and difficulty of engineering research.Baofeng Tunnel passes through the Tertiary weak cemented strongly weathered strata and rich groundwater in which collapse and water and mud outburst occur repeatedly.Based on engineering geological investigation geological prediction monitoring and measuring of tunnel and a number of test results the type of tunnel deformation is divided into shallow gully type fault fracture zone type and carbonaceous mudstone type in this paper. Construction program is made and applied which effectively controls the deformation of the tunnel and good results are achieved. Key words:tunnels;soft rock tunnels;expansion;deformation;control method 0引言 工程自身的特殊性，研究隧道围岩变形机理，提出 软岩基本特性主要表现为强度低、易风化、孔防治措施. 隙比大、重度小、易渗水，具有显著的膨胀性和明显1工程概况 的时效特性，往往对隧道施工安全和工期造成严重 昆玉铁路宝峰隧道下穿高速段位于滇泄盆地 影响.国内外学者对软岩隧道大变形及控制技术 与玉溪盆...
施工技术 2016年1月上 20 CONSTRUCTION TECHNOLOGY 第45卷第1期 D0I:10.7672/sgjs2016010020 软土基坑桩锚支护失效案例及处理措施分析* 葛阳成1，朱进军2，邵勇2 (1.连云港市建设施工图审查中心，江苏连云港222006；2.连云港职业技术学院建筑工程学院， 江苏连云港222006) [摘要]某软土基坑采用桩铺支护结构，在基坑开挖完毕后坑体变形突然增至数十厘米，随后经过坑底处砂袋堆载 和钢管支撑使得工程顺利完成.通过现场监测数据分析，认为其原因一是施工速度过快，使得变形无法收敛，二是 软土中桩锚支护结构容易发生转动，特别是在错索错固角度较大和桩体嵌固深度较浅时，因此在软土基坑中采用 桩锚支护结构应加强设计，如减小锚固角度、增大桩长等. [关键词]基坑；软土；支护；失稳；处理措施 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2016)01-0020-04 Failure Case Study and Treatment Measures of Pile Anchor Supporting Structure Under Soft Soil Foundation Excavation Ge Yangcheng' Zhu Jinjun2 Shao Yong? (1.Center of Construction Plan Review in Lianyungang City Lianyungang Jiangsu 222006 China: 2.Department of Architectural Engineering Lianyungang Technical College Lianyungang Jiangsu 222006 China) Abstract:A soft soil foundation excavation using retaining structure of pile and anchor after the pletion of excavation foundation excavation deformation suddenly increased to tens of centimeters and then the projects successfully pleted with the sandbags heap the bottom and steel supporting. Through analysis of field monitoring data one of reasons is fast construction so that deformation can't converge and the other one is in the soft soil pile anchor retaining structure is prone to rotate especially in the larger angle of anchorage and pile embedded depth is shallow so the use of pile anchor retaining structure in soft soil foundation should strengthen the design such as reducing the angle of anchor inc...
施工技术 2015年10月上 56 CONSTRUCTION TECHNOLOGY 第44卷第19期 D0I:10.7672/8js2015190056 软土基坑坑角效应的三维有限元分析 尹盛斌1 2 (1.深圳市城市空间规划建筑设计有限公司上海分公司，上海200122；2.天津大学建筑工程学院，天津300072) [摘要]通过对三维与平面应变状态下无支撑及多道支撑的基坑开挖模拟，对基坑的坑角效应进行较为深人的研 究，包括考虑几何尺寸对基坑角部效应的影响，具体表现为对墙体变形及坑外土体位移的影响.当基坑开挖宽度 较大时，相邻墙体的作用较强，基坑角部效应范围较大，约为5~7倍开挖深度，此时应考虑凸出现象的影响，同时 坑外土体相应位置也将产生较大位移. [关键词]软土；基坑；坑角效应；有限元分析 [中图分类号]TU443 [文献标识码]A [文章编号]1002-8498(2015)19-0056-03 3D Finite Element Analysis of the Corner-effect of Foundation Excavation in Soft-soil Area Yin Shengbin (1.Shenzhen Urbanspace Planning Architectural Design Group(Shanghai) Shanghai 200122 China; 2.School of Civil Engineering Tianjin University Tianjin 300072 China) Abstract:Based on the simulation of the three-dimension and plane strain condition excavations with non-support and multi-support the corner effect of the foundation excavation is conducted with a more in- depth research including consideration of the geometrie dimensions of the corner effect.The specific effect is reflected on the wall deformation and the displacement of soil outside the foundation excavation. When the excavation width is larger with stronger effect on the wall the corner effects are relatively outstanding with the sphere of influence about 5~7 times of the depth of excavation.At the same time the convex effect should be considered fully.The displacement of the soil outside corresponds to convex point will be also more obvious. Key words:soft soil;foundation excavation;corner effect;finite element ...
2016年8月上 施工技术 第45卷第15期 CONSTRUCTION TECHNOLOGY 99 D0I:10.7672/8js2016150099 软土地层深基坛隆起变形规律及其对周围建筑物 的影响* 杜磊，王育平 (山东科技大学矿业安全学院，山东岛266590) [摘委]以北京菜地区深基工程为背景，采用工程经翰法和有限元拟种方法，对施工过程中成的底隆 起、建物差异沉障进行结算，分别指出了基悦最大变形和建物相对危险源，分析了2种方法的优点，示 了2种方法对工程预估的现实意义.出了基悦开挖过程中由地的沉降方程以及悦底隆起与开挖深度之间 的指敷关季. [美键词]地下工程：深基悦：隆起：变形；差异沉降：有限元分析 [中图分类号]TU753[献标识码]A[支章编导]1002-8498(2016)15-0099-05 Soft Soil Foundation Excavation Uplift Deformation Law and Its Impact on Surrounding Buildings Du Lei Wang Yuping College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao Shandong 266590 China) Abstract:According to the engineering practice in Beijing engineering experience and finite element simulation are applied to estimate the bottom uplift the building differential settlement caused by the construction process.It respectively indicated maximum deformation values of foundation excavation and the relative hazard of building the advantages and disadvantages of the two methods are analyzed revealing the significance of their project estimates.It made the equation of free surface settlement exponential relationship between bottom uplift and excavation depth. Key words:underground;deep foundation excavation;uplift;deformation;differential settlement;finite element analysis 0引言 控制施工灾害具有重要的意义. 随着城市化进程的不断加快，地下空间的开发 目前，图内外学者已从理论、数值伤真和现场 与利用成为城市建设的主要方向.城市建设中遇监测角度对基坑隆起变形规律及其对周围环境的 到越来越多的深基坑工程，基坑开挖大多在城市影响展开研究，如孙钓根据模型试验与实测数据 繁华地段，临近道路、既有建筑物等地面结构及地 的对比分析，提出了判断坑底失稳的依据；刘燕[3] 铁、腿道等地下工程川.基坑开挖，打破...
施工技术 2014年6月上 112 CONSTRUCTION TECHNOLOGY 第43卷第11期 D0I:10.7672/5j52014110112 软土地基堆载预压沉降特性及智能化预测研究* 余景良，吕言新2，李海波2 (1.广州航海学院航务工程系，广东广州510725； 2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉430071) [摘要]针对软土地基含水量高、压缩性高及抗剪强度低的特点，采用理论分析与数值模拟相结合的方法，从力学 机理探讨了堆载效应与软土地基沉降的关系.软件FLA3D数值模拟表明，随着地基深度的增加，地基的竖向沉 降不断减少，并且其递减幅度随深度的增加而增大，最大水平向位移发生在堆载物边缘以下的深部地基土中；随着 水平距离的增加，地基竖向沉降也不断减少，并且其减少的幅度较均匀，当水平距离增加到一定值，其沉降值维持 在某一个恒定值.以现场监测资料为基础构建动态模糊神经网络，获得了准确度和可靠度较高的预测结果，表明 动态模糊神经网络具有较强的网络稳定性和泛化能力. [关键词]地基；堆载预压；沉降；软土；预测；数值模拟 [中图分类号]TU472.33 [文献标识码]A [文章编号]1002-8498(2014)11-0112-03 Study on Settlement Characteristics and Intelligent Forecasting with Surcharge Preloading in Soft Soil Foundation Yu Jingliang' LǔYanxin㎡，Li Haibo2 (1.Department of Narigational Fairs Engineering Guangzhou Maritime Institute Guangzhou Guangdong 510725 China; 2.State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071.China) Abstract:Based on high water content high pressibility and low shear strength characteristics in soft soil foundation bined with theoretical analysis and numerical simulation this paper introduces the relationship between surcharge effect and settlement in mechanical mechanism respect in soft soil foundation.Software FLAC3D numerical simulation shows that the vertical foundation settlement decreases gradually with the foundation depth increased and the decreasing rate increases with depth increased.The maximum horizontal di...
2017年1月上 施工技术 第46卷第1期 CONSTRUCTION TECHNOLOGY 13 D0I:10.7672/sgjs2017010013 软土地基双排钢板桩围堰稳定性分析及应用 徐顺平，戴小松，张安政，谢学彬，严浩明 (中建三局投资发展有限公司，湖北武汉430076) [摘要]双排钢板柱围堰由于结构不设内支撑，在软土地基中变形量大，易发生倾覆.基于东湖通道围堰工程实 例，对双排钢板桩围堰“前短后长”和“前长后短”两种结构形式变形特性分析和探讨，分析软土地基双排钢板柱围 堰在5种不同抽水速率工况下变形及受力情况.结果表明，围堰在抽水阶段，“前长后短”结构形式位移变形小于 “前短后长”.结合监测数据及专家意见，提出0.2m/d抽水速率指标以及三级变形监测预警控制值，确保围堰 安全. [关键词]地基；软土；钢板桩围堰；稳定性；变形；监测 [中图分类号]TU443 [文献标识码]A [文章编号]1002-8498(2017)01-0013-05 Analysis and Application of Double Row Steel Sheet Pile Cofferdam Stability on Soft Soil Foundation Xu Shunping Dai Xiaosong Zhang Anzheng Xie Xuebin Yan Haoming Investment Development Corporation of CCTEB.Wuhan Hubei 430076 China) Abstract:Because of the double row steel sheet pile structure without support it is summarized as large deformation in soft soil foundation and easy to overturn.Based on Eastlake Tunnel cofferdam engineering this paper discussed two kinds of structure type deformation characteristics as 'short after long'and 'long after short'of the double row steel sheet pile cofferdam.Using elastic plastic constitutive model the authors make analysis on soft soil foundation of double row steel sheet pile cofferdam in five different pumping rate under the condition of deformation and stress.The results show that cofferdam in the pumping stage ‘before long short'structure type displacement deformation is smaller than the‘long and short in front'.Combined with the monitoring data and expert opinion the 0.2m/d pumping rate index and the thre...
施工技术 2011年5月下 52 CONSTRUCTION TECHNOLOGY 第40卷第341期 软土地区超大深基坑中心岛支护方案设计与施工 周予启，刘卫未 (中建一局集团建设发展有限公司，北京100102) [摘要]在超大面积深基坑工程中，中心岛设计方法具有明显优势，不仅可以降低工程造价，还可以提高中部主体 结构的施工进度.以天津嘉里中心工程超大深基坑工程为背景，着重介绍了中心岛方案设计需考虑的因素及工况 流程，并结合该工程实施过程中出现的同题进行详细分析.采用FLAC数值模拟软件对中心岛支护方案基坑变形 进行分析，并结合工程实际监测数据，对该设计方法反压土台宽度进行探讨. 【关键词]超大深基坑：中心岛法；数值模拟；反压土台宽度 [中图分类号]TU753.1 [文献标识码]A [文章编号]1002-8498(2011)10-0052-03 Design of Central-island Method and Its Construction for Super Large Deep Foundation Excavation in Soft Soil Area Zhou Yuqi Liu Weiwei China Construction First Dinision Group Construction Development Co.Led.Beijing 100102 China) Abstract:Central-island method has very obvious advantages in the super large deep foundation excavation engineering.The project cost and construction period are saved by using the new method. Application of central-island method in foundation excavation of Tianjin Kerry Center is introduced emphatically the construction process and the factors which must be taking into account in the design of central-island scheme.The problems appearing in the implementation process is discussed in detail. Using FLAC numerical simulation software deformation of central-island scheme was analyzed. According to the results of numerical simulation and the foundation excavation monitoring data width of passive soil slop is presented. Key words:super large deep foundation excavation;central-island method;numerical simulation;width of passive soil slop 天津嘉里中心工程分为1，Ⅱ期工程，期工程和地下连续墙两种形式.地下连续墙造价较高，多 由3栋公寓、1栋酒店和整体地下车库组成.面积采用二墙合一形式，即同时作为基坑开挖的围护体 73011m2 边长均超过200m 开挖深度16.45m 公和正式结构的地下室外墙.二墙合一的地下连续墙 寓塔楼开挖深度17.825m 电梯井坑开挖深度达设计除应满足基坑支护安全要求外，还需考虑主体 23.275m 酒店塔楼区开挖深度达17.025m 电梯并阶段地下室外墙所承受的荷载及各楼层的准确标高 坑开挖深度达22.025m.场区内地下水位埋深较（以提前预埋钢筋连接器），因此对主体结构地下室 浅，约在自然地面以下2m 土层分布以粉质黏土层 设计的进度有一定要求.本工程中在基坑支护设计 为主，局部夹粉砂层. 阶段，地下室主体结构设计尚未完成，在工期上不满 1基坑支护设计考虑因素 足二墙合一的要求，因此基坑围护结构选用钻孔灌 1.1图护结构选型 注桩止水帷幕的形式.钻孔灌注桩为 天津地区地下水位较高，土质较软，基坑工程尤 1000mm@1200mm 止水幕采用b850mm@ 其是市区基坑工程，在进行基坑开挖时均要求隔断600mm三轴水泥土搅拌桩. 地下水.围护结构主要采用钻孔灌注桩止水椎幕1.2支护体系...
[关键词】地下工程；高层建筑；深基坑：软土地区；沉降；文物建筑 [中图分类号]TU753[文献标识码】A[文章编号]1002-8498(2015）01-0028-04 InfluenceonCultureBuildingSettlementofDeepFoundation Excavation inSoft Area Gong Jiangfei，Zhou Xiaoming,Zhang Ji,Liu Zhenji,Li Ning (China State Construction Engineering Co.，Ltd.，Beijing 100037,China) Abstract:This paper summarized the setlement law of culture building based on monitoring data in No. 9 building of Jinwan Plaza in Tianjin, analyzed the reasons of settlement. The main factors are soil excavation，foundation excavation dewatering and construction disturbance. Then this paper introduced control measures in this project and gave suggestions for the similar project. Key words:underground; tall buildings; deep foundation excavation; soft soil area; settlement; culture building 0引言（不含顶部造型）及4层裙房组成，建筑物下设置4 随着城市人口的不断增长和土地价值的提高，层地下室，且地下室连为一体，地下1层层高6.8m， 人类生存空间不断向空中延伸，因而高层和超高层地下2~4层层高4.5m，地下部分功能为酒店配套 建筑得到了迅猛发展，建筑高度越来越高，同时基用房和车库等。
2011年5月上 施工技术 第40卷第340期 CONSTRUCTION TECHNOLOGY 软土地区深基坑工程存在的变形 与稳定问题及其控制 —基坑施工全过程的稳定问题 郑刚，宾华港2 (1.天津大学建筑工程学隆，天津300072：2.天津市建设交通管理委员会，天津300051) [要]对基悦施工全边程可能产生的穆定向题进了分析，出了复杂深卷悦的穆定向题直性.根基悦 穆的接引发因素划分为基抗连护传构施工引发的穆定向题、悦内外土体形成滑动面引发的穆定向题、竖向直拖 传构（排裤、地下连镇墙等）破坏引发的基悦稳定向题、水平连撑（猫杆）系说破坏引起的基悦穆定向题、水平支撑 的竖向支承系说（童柱）破环引发的稳定向题和地下水引发的稳定向题6类，对具关稳机理、危害、程进行了 分析.最后，提出了基悦支护结体系的元余度设计概会和分类. [关键词]土：深基悦：支护开挖：移定破坏：余度 [中便分类导]TU447 [文献标识好]A [文章编号]10028498(2011)09-0001-06 Stability and Deformation Problems During Deep Foundation Excavation in Soft Soil Area and Their Control Measures -Stability Problems During the Whole Process of Excavation Construction Zheng Gang' Dou Huagang (1.School of Ciril Engineering Tianjin University Tianjin 300072 China: 2.Tianjin Urban Construction Communications Commission Tianjin 300051 China) Abstract:The stability problem must be carefully examined to minimize the impact of excavation on surroundings when deep excavation urban area is surrounded by various buildings roads buried pipelines and underground tunnels.The stability problems during the whole process of excavation are discussed and the plex of stability failure of braced deep excavation is illustrated.Based on the element whose failure directly leads to the stability failure of brace excavation the stability problems of braced deep excavation is classified into 6 categories namely stability problem induces by construction of retaining wall slip surface formed in ground stability problem due to the failure of retain...
2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 5 软土地区深基坑工程存在的变形 与稳定问题及其控制 一基坑施工全过程可产生的变形 李光照，郑刚2 (1.天津滨海新区建设投资集团有限公司，天津300450；2.天津大学建筑工程学晓，天津300072) [摘要]随着我国城市建设的发展，软土地区的深基坑工程设计与施工面临越来越复杂的环境条件，基坑施工对环 境影响的控制要求也越来越严格，基坑工程已进人已变形控制设计与施工为主的时代.结合天津软土地区的工程 实践及国内其他地区经验，将基坑工程的全过程划分为基坑支护结构施工、基坑降水、基坑开挖、基坑使用、拆除支 撑、地下水位恢复等6个阶段，分析了施工全过程各个阶段可能产生的稳定与变形机理、危害及控制方法. [关键词]软土：基坑工程；降水；变形：稳定 [中图分类号]TU447 [文献标识码]A[文章编号]1002-8498(2011)07-0005-05 Stability and Deformation Problems During Deep Foundation Excavation in Soft Soil Area and Their Control Measures —Deformation in Process of Foundation Excavation Li Guangzhao' Zheng Gang2 (1.Tianjin Binhai New Area Construction Investment Group Co.Ltd.Tianjin 300450 China; 2.School of Cicil Engineering Tianjin University Tianjin 300072 China) Abstract:With the development of urban construction in China environment conditions of design and construction of deep foundation excavation in soft soil is getting more plex and control requirements for influence of foundation excavation on environment is getting more strict.Based on engineering practice process of excavation construction is divided into six stages as construction of retaining structures foundation excavation dewatering excavation service stage demolition of support and groundwater level recovery.Stability and deformation mechanism and harmfulness and countermeasures in each stage are analyzed. Key words:soft soil;foundation excavation;dewatering:deformation;stability 1软土地区基坑工程的特点 ~40m 其中上海地铁四号线修复工...
【关键词】软土；基坑；变形；水平位移；拉应变 [中图分类号】TU447[文献标识码】A [文章编号]1002-8498（2011)08-0008-07 Stability andDeformationProblemsDuringDeepFoundation Excavation inSoftSoil Areaand Their Control Measures -AllowableDeformationControlandUnconventionalDeformation Zheng Gang'， Jiao Ying², Li Zhu² (1.School of CisilEngineering,TianjinUniersty,Tianjin300072,China; 2.Tianjin Urban Infrastructure Construction & Investment Co.，Lad.，Tianjin 300050,China) Abstract:It is being more and more diffcult to determinate the allowable deformation due to urban area deep foundation excavation when it is surrounded by various buildings, roads, buried pipelines and underground tunnels. According to the current codes, the maximum displacement of retaining wall is the main index to be controlled during design and construction stage. The indexes of deformation of retaining structure and surounding buildings of domestic and intermational codes are pared and discussed. Some issues that may affect the deformation of ground behind retaining wall, building and other services are classified.When there are nearby buildings or services that are sensitive to deformation, the allowable maximum deformation of retaining wall is suggested to be determined by detail analysis instead of determined simply according to the current codes. Key words;soft soil; foundation excavation; deformation; horizontal displacement; tensile strain 1我国基坑变形控制指标 坏，影响其正常的使用功能，并造成一定的社会影 正如作者所指出，软土地区深基坑的施工往响。
【关键词］地下工程；深基坑；支护；软土；施工技术；监测 [中图分类号】TU753【文献标识码】A[文章编号11002-8498（2012）19-0041-04
Comprehensive Support Technology in Different Stage of Deep Foundation Excavation in Soft Soil Area Jiang Qingguo, Chen Lintao, Zhang Xiuxian, Peng Haifeng ( Tianjin No. 20 Metallurgical Construction Co. ,Ltd. ,Tianjin 300301 ,China)
Abstract: According to the safety requirement of a deep foundation excavation engineering in coastal soft soil area, different support methods were adopted in different stages of construction. Specifically, row of bored piles with water proof curtain and cement mixing pile submerged pier, cement mixing pile retaining wall and row of bored piles with steel supports have been adopted. Site monitoring data shows that by proper arrangement of construction process, such as structural construction, well-points dewatering, and soil excavation, the supporting structure was maintained stable and the foundation excavation safety was ensured. Key words:underground ; deep foundation excavation; supports; soft soil; construction ; monitoring
1~ 工程概况厂房（檐口标高47m）、检验楼、电气室（4层框架结 天津鞍钢天铁薄板有限公司位于天津空港经构）、100t应急水塔（钢筋混凝土倒锥形水柜，水柜 济区，一期工程于2008年建成投产，二期工程包括标高57.000m）等建筑物。
[关键词】软土地区；盾构：土体位移；扰动 [中图分类号]U455.43 [文献标识码]A [文章编号〕1002-8498(2015)24-0086-04 ExperimentalStudyonDisturbanceofSoilCausedbyShield TunnelingintheDeepPositionofSoftSoilRegion Liu Shujia',Bai Tinghui.²,Liao Shaoming',Chen Lisheng²,Zhao Guoqiang (1.Department of Geotechnical Engineering，Tongji Unitersity,Shanghai 200092,China; 2.Shanghai Shentong Metro Co.，Ltd. ,Shanghai 201100,China; 3.Shanghai No.2 Municipal Engineering Co. ,Lad.,Shanghai 200065,China) Abstract:A whole section measurement is installed to measure the displacement of soil disturbance in deep soft soil region of Shanghai. Monitoring and recording analysis is carried out aiming at soil disturbance characteristics in shield excavation.According to the parative study of measured data,it can be concluded that the range of soil disturbance caused by shield tunneling is 2D in cross-sectional direction, 1D in vertical-sectional direction. Additionally， the displacement of the soil disturbing in shield tail prolapse stage is larger than twice as the one in shield tail digging phase. Key words:soft soil region;shields;displacement;disturbance 0引言 比以往更大的困难。
[关键词】基坑；软土地区；桩；围护桩；流土；变形 [中图分类号】TU447 [文献标识码】A [文章编号〕1002-8498（2014)01-0091-05 AnalysisofInfluenceoftheSoilLossBetweenPilesontheDeformation Characteristics ofFoundationExcavationinSoftSoil Li Zhiwei (Fujian Academy of Building Research，Fuzhou,Fujian 350025,China) Abstract;In soft soil, the soil loss between the bracing piles has a more significant impact on the surrounding environment.Based on engineering practice,the influence of the soil loss between piles on the deformation characteristics of foundation excavation is analyzed.The influence of the soil loss shows significant spatial effect,that the influence degree on the positive corner is significantly larger than the negative corner. The soil loss will not only affect the displacement of the soil above the excavation section，but also affect the displacement of the soil below the excavation section within a certain depth range. The soil between the front and rear piles of double-row piles is affected’ by the soil loss, but the soil behind the rear piles is less affected. Key words:foundation excavation; soft soil; piles; bracing piles;soil loss;deformation 0引言 及渗水等现象。