[关键词]地下工程;地下室;回填土;坡形地貌;结构倾覆 [中图分类号]TU375;TU93 [文献标识码】A [文章编号]1002-8498(2015)23-0079-03 Influence Analysis of Backfill with Slope Topography on BasementStructure Li Cuicui',Song Jieping',Jiang Dan² (1.Qingjian Group Co.,Lad.,Qingdao,Shandong 266071,China;2.School of CivilEngineering, QingdaoTechnologicalUniversity,Qingdao,Shandong266033,China) Abstract:The checking calculation of the stability and anti-sliding performance of slope construction is important in design stage.The effect of backfill condition on the whole structure overturning is not consideredingeneralcase.Thispaperputsforwardrelevantcalculationformulabyconsideringthefect of backfill condition on the whole structure overturning,checks the minimum bearing capacity of the basement in different backfill conditions based on some key project,which ensures the structure safety. Key words:underground;basement;backfill;slope topography; structure overturning 方,常指山坡和谷坡。
根据《高层建筑混凝土结构技术规程》JGJ3一 [作者简介]李翠翠,工程师,E-mail:296076201@qq. 2010中的要求,在重力荷载和水平荷载共同作用 [收稿日期】2014-12-29 下,对于高宽比>4的高层建筑物,基础底部不宜出 万方数据
80 施工技术 第44卷 L 图4重力荷载作用的基础底部压应力分布示意 a结构立面 Fig.4 The pressive stress distribution on the b荷载作用位置 bottom of the foundation unde...
2014年10月上 施工技术 第43卷第19期 CONSTRUCTION TECHNOLOGY 85 D0I:10.7672/5js2014190085 坡地地貌岩体基坑抗浮水头试验模拟与分析 杨淑娟1,于德湖1,张同波2,余良刚1 (1.青岛理工大学土木工程学院,山东青岛266033;2.青建集团股份公司,山东青岛266000) [摘要]通过自制试验模型,对坡地地貌岩体基坑在不同降雨强度和坡度下的抗浮水头进行研究,并与有限元程序 计算结果对比分析,验证了前期所推导的抗浮水头计算公式的合理性.通过研究进一步表明极端降雨条件下,基 坑下游最低点向坑外溢水时,基坑上游水位并不与最低点持平而是持续增长,若取下游最低点作为抗浮水位值,工 程将不能满足抗浮要求,存在安全隐患. [关键词]基坑;坡地;岩体;抗浮水头;坡度;试验 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2014)19-0085-05 Experimental Simulation and Numerical Analysis of the Anti-floating Head of Slope Landform Rock Foundation Excavation Yang Shujuan' Yu Dehu' Zhang Tongbo2 Yu Lianggang' (1.School of Civil Engineering Qingdao Technological University Qingdao Shandong 266033 China; 2.Qingjian Group Co.Ld.Qingdao Shandong 266000 China) Abstract:Through self-made test model this paper studies the anti-floating head of slope landform rock foundation excavation in different rainfall intensity and slope.With the finite element calculation results for parative analysis this paper verifies the reasonableness of the calculation formula of anti-floating head derived preliminary.By further study it shows that under conditions of extreme rainfall when the lowest point of foundation excavation downstream spills outside the foundation excavation upstream water level and the lowest point is not flat but sustained growth.If downstream lowest point is presumed as anti-floating level value the project will not meet the requirements of anti-floating as well as potential safety hazard. Key words:found...
施工技术 2015年10月上 28 CONSTRUCTION TECHNOLOGY 第44卷第19期 D0I:10.7672/8js2015190028 坑顶大梁桁架支座预埋件后安置施工技术 施宇冬,杨媛鹏,李峁清,李小飞,王勃龙 (中国建筑第八工程局有限公司,上海200122) [摘要]一般预埋大型钢结构构件通常是先进行预埋件定位安装再进行钢筋绑扎等后续工序.上海世茂深坑酒店 坑顶大梁上的28个主楼钢结构桁架支座预埋件结构相当复杂,如果先进行预埋件的安装,将使得后续的钢筋绑 扎、螺旋箍安装和预应力锚索的定位加固变得困难.因此,坑顶大梁的桁架支座预埋件施工采用后安置法,实际工 程中效果良好. [关键词]梁;钢结构;预埋件;后安置;施工技术 [中图分类号]TU375.1 [文献标识码]A [文章编号]1002-8498(2015)19-0028-02 Construction Technology of the Roof Truss Girders Placed After Embedded Parts Shi Yudong Yang Yuanpeng Li Maoqing Li Xiaofei Wang Bolong (China Construction Eighth Engineering Bureau Co.Ltd.Shanghai 200122 China) Abstract:Generally pre-buried large steel structural members which are usually firstly installed of embedded parts positioning rebar and other follow-up processes.The 28 main girder steel structure truss support structures are quite plex embedded parts of Shanghai Shimao Chasm Hotel.If the embedded parts were installed firstly the positioning of subsequent reinforcement assembling installation and spiral hoop prestressed anchor cable reinforcement bees difficult.The roof truss support embedded parts of the girder was constructed after placement and the practical engineering effect is good. Key words:beams;steel structures;embedded parts;post placement;construction 1工程概况 本工程拟建场地位于全国12个国家级旅游度 假区之一的松江余山风景区内(天马山与横山间), 场地南近辰花路、西临横山塘、北靠旺家浜,占地面 积约136516m2 其中工程建设占地面积约 105350m2 是国内首个集大型住宅、酒店、休闲娱乐 于一体的地平线主题项目.因场地条件比较特殊, 主体工程位于松江天马山深大采石坑坑内,整栋建 图1深坑酒店效果 筑附建在深坑边坡上,创意独特,如图1所示. Fig.1 Effect of the hotel...
施工技术 2015年10月上 68 CONSTRUCTION TECHNOLOGY 第44卷第19期 D0I:10.7672/8js2015190068 坑边不均衡堆载对基坑围护结构及周边环境影响分析 程群,刘芳玲1,王强2 (1.中建四局第六建筑工程有限公司,安徽合肥230011;2.安徽理工大学土木建筑学院,安徽淮南232001) [摘要]为了深人研究基坑底板施工过程中坑边不均衡堆载对基坑围护结构的内力和位移及周边环境的影响,运 用岩土有限元软件MIDAS/GTS模拟了不均衡堆载下深基坑开挖过程,从而得到了不均衡堆载条件下基坑围护结 构内力、变形及地表沉降的分布规律.计算和分析结果表明:坑边不均衡堆载对基坑围护结构的内力和位移及地 表沉降产生了较大影响,尤其是围护结构水平位移及地表沉降,这使得基坑的稳定性处于不利的状态. [关键词]地下工程:基坑:不均衡堆载:围护结构;内力;位移 [中图分类号]TU43 [文献标识码]A [文章编号]1002-8498(2015)19-0068-06 Influence Analysis of Building Envelope and Surrounding Environment Under the Excavation Unbalanced Heaped Loading Cheng Qun' Liu Fangling' Wang Qiang㎡ (1.China Construction 4th Engineering Bureau 6th Co.Ltd.Hefei Anhui 230011 China:2.School of Civil Engineering and Architecture Anhui University of Science and Technology Huainan Anhui 232001 China) Abstract:In order to research the influence of internal force of retaining structures the deformation and the surrounding environment under the excavation side loading during construction of foundation excavation bottom MIDAS/GTS was used to simulate the unbalancedheaped load under deep excavation process which obtained internal force of retaining structure deformation and subsidence.The results show that building envelop and surrounding environment under the excavation side loading has a larger influence especially the horizontal displacement of retaining structure and the settlement of ground which makes the foundation excavation in unfavorable state. Key words:underground;foundation e...
2016年8月下 施工技术 第45卷第16期 CONSTRUCTION TECHNOLOGY 53 D0I:10.7672/8js2016160053 坑底钢管静压桩地基托换加固技术应用 张廷会,李小刚,了小强 (陕西天地地展有限责任公司,陕哥容710054) [摘委]底静压桩地基抵换技术可以对具有湿陷性的弱土层,解决构翼的地基产生沉降变形的向题.结合 忧底钢管静压地基换加固技术原理和陕西某煤矿瓦斯泵房风机地基沉降变形蓝工程地质件,提出了悦底铜 静压花加团设计方亲,介了忧底钢管静压雄成雄施工工艺、质量控制要点,对悦底静压的光入土深度 和压桩力进行了分析.结果表明,抗底钢管静压桂对软弱湿陷性地基加园果良好,成质量拉制要重视施工的 过程制,可以很好地解决款弱湿性土层产生的地是沉降开裂向题. [关键词]加固;钢管静压桩;地基;沉降;托换;应用 [中图分类号]TU753.3 [女故标识码]A[交章编号]1002-8498(2016)16-0053-04 Reinforcement Technology Application of the Foundation Underpinning with the Steel Pipe Bottom Static Pressure Pile Zhang Tinghui Li Xiaogang Ding Xiaoqiang (Shaanxi World Geological Limited Liability Company Xi'an Shaanxi 710054 China) Abstract:Static pressure pile foundation underpinning technology can solve the problem of structure foundation subsidence deformation in bottom collapsibility with soft soil layer.Combining with steel pipe bottom static pressure pile foundation underpinning reinforcement technology principle and shaanxi subgrade settlement deformation of the coal mine gas pump room fan and engineering geological conditions the bottom steel pipe pile underpinning reinforcement design scheme is put forward.This paper introduces the construction technology for steel pipe pile static pressure pile bottom and key points of quality control.Capacity of static pressure pile bottom of pile tip and the force that press a pile are analyzed.The results show that the steel pipe pile bottom collapsibility of soft foundation reinforeement effeet is good ...
施工技术 2011年11月下 96 CONSTRUCTION TECHNOLOGY 第40卷第353期 土钉支护技术在中国科学院中关村 青年公寓工程中的应用 宋艳茹 (中国科学晓电工研究所,北京100190) [摘要]针对中关村青年公寓10 11号楼的具体情况及水文地质条件,综合比较土钉支护与护坡桩支护方案的优 缺点,最终确定采用土钉支护技术.详细介绍了土钉支护设计和分层分段施工及要求,最后对工程边坡水平位移 进行监控测量,结果表明支护效果良好,确保了基坑边坡稳定和周围建筑物的安全性,使基础施工顺利进行,取得 了较好的社会效益和经济效益. [关键词]地下工程;基坑;支护;土钉;预应力;稳定性 [中图分类号]TU753.1 [文献标识码]A [文章编号]1002-8498(2011)22-0096-03 Application of Soil Nailing Support in Zhongguancun Youth Apartment by Chinese Academy of Sciences Song Yanru Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China) Abstract:Combined with the engineering situation and hydrogeology conditions of the 10th and 11th building of Youth Apartment in Zhongguancun Beijing the soil nailing support is applied by paring with slope protection piles support.The subsection construction and requirement are put forward and the soil nailing design is introduced.The horizontal displacement for engineering slope is monitored.The results show that the support effect is good.The stability and safety are guaranteed and the good social benefit and economic benefit are obtained. Key words:underground;foundation excavation;support;soil nailing;prestressing;stability 1工程概况 ①,黏质粉土填土及①2碎石填土.以下第四纪沉 中国科学院中关村青年公寓10 11号楼位于海积层层顶标高49.44~50.15m 主要为②黏质粉土、 淀区中关村东路80号.拟建建筑物为框架剪力墙 砂质粉土,②,黏质粉土、重粉质黏土.层顶标高 结构,地下室埋深11.25m 筏板基础,槽底标高- 46.38~47.56m主要为③粉质黏土、重粉质黏土, 12.01m 持力层为④粉质黏土、黏质粉土、④1黏质③,黏质粉土、重粉质黏土,③2黏质粉土、砂质粉 粉土、粉质黏土. 土.层顶标高41.95~43.24m主要为④粉质黏土、 本工程属深基础,工程量大,工期紧,土质情况 黏质粉土,④,黏质粉土、粉质黏土,④2...
[关键词]地下工程;基坑;阳角;土钉;冗余度 【中图分类号】TU311.41[文献标识码]A[文章编号]1002-8498(2011)24-0037-06 Study on Redundancy ofFoundation Excavation Convex Location Supported by Soil Nailing Wang Haixu', Cheng Xuesong',Zheng Gang² (1.Departmentof CivilEngineering,TianjinUniversity,Tianjin300072,China; 2.MOE Key Laboratory of Coast Civil Structure Safety,Tianjin300072,China) Abstract;As the convex location of foundation excavation is disadvantageous locations to control its displacement,a special consolidation design is necessary.The redundancy theory on design is introduced for the underground engineering field. The convex location of foundation excavation supported by soil nailing has been consolidated with breast beam and its redundancy has been analyzed. The horizontal displacement of the side-wall, the axial force of soil nailing in original system and redundant system have been respectively analyzed and pared. The work situation of soil nailing with breast beam support system when part of soil nailing failed has been studied. The results prove that consolidating the convex location of excavation supported by soil nailing with breast beam can effectively control the displacement of dangerous location,transfer the redundant load and increase the transferring path. Hence, it can improve the redundancy of support system. Key words:underground; foundation excavation; convex location; soil nailing; redundancy 0引言州塔等[。
2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 41 土钉墙支护结构破裂角的研究 袁洪升 (廊坊师范学院建工学院,河北廊坊065000) [摘要]土钉支护技术已广泛应用于一般的基坑和边坡工程中,规范中对土钉支护结构进行设计时,采取破裂面为 直线,破裂角取45°/2.借助准黏聚力理论,认为土体中设置土钉后,土体的内摩擦角不变而粘聚力变大,土体 的抗剪强度增强.而且在土体中设置土钉后,改变了土体的应力状态,主应力方向发生偏转,土体的滑裂面相应改 变.通过对土钉支护结构中的土体单元进行应力分析,得出了垂直基坑中土钉支护结构滑移面的破裂角为45° 单2-.结果表明土钉剪切滑移面破裂角与土体内摩擦角和七钉倾角有关,均成线性关系. [关键词]土钉墙;准黏聚力;应力莫尔圆;滑移面:破裂角 [中图分类号]TU413.62 [文献标识码]A [文章编号]1002-8498(2011)07-0041-03 Research on Rupture Angle of Soil-nailing Wall Structure Yuan Hongsheng Institute of Civil Engineering and Architecture Langfang Teachers College Langfang.Hebei 065000 China) Abstract:Soil-nailing support technology is applied in general foundation excavation and slope widely. The rupture plane of soil-nailing structure is thought as a straight line and the rupture angle is45°p/2 in standard.Based on theory of pseudo-cohesion the angle of internal friction of soil is invariant while the cohesion is getting bigger and shear strength of soil is getting strengthened after the soil-nailing is fixed in the soil.When the soil-nailing is fixed in the soil the stress state of soil is changed the principal stress direction deflects and the rupture plan changes in response.The formula of ruptured angle 45°/2-in the soil-nailing structure of vertical foundation excavation is derived through the stress analysis of soil unit in the soil-nailing structure.It is indicated that the rupture angle of shear-sliding plane in the soil-nailing structure is linearly related to th...
2012年8月上 施工技术 第41卷第370期 CONSTRUCTION TECHNOLOGY 103 土袋护岸结构施工技术 程龙飞,何运祥 (重庆三峡学院土木工程学院,重庆404000) [摘要]河道边岸第四纪松散堆积土坡,其结构疏松,力学强度低,极易被地表径流带走造成边岸侵蚀.土袋结构 可以加固边岸、增强边坡的抗冲能力.采用合理的种植方式,植被可以在土袋中生长繁衍,重建群落.土袋护坡结 构可同时解决边坡稳定和植被恢复两大难题.主要介绍了土袋护坡结构的基本组成以及施工技术,包括基础施 工,土袋结构施工以及植被的选择与施工. [关键词]岩土工程;土袋;护坡结构;植被恢复;施工技术 [中图分类号]TU751.5 [文献标识码]A[文章编号]1002-8498(2012)15-0103-03 Technology for Slope Protection Using Earth Bags Cheng Longfei He Yunxiang Civil Engineering School of Chongging Three Gorges College Chongging 404000 China) Abstract:Quaternary loose accumulated soil slopes along riverbanks are structurally loose with low mechanical resistance and can be easily washed away.Earth bags can strengthen river banks and prevent the soils from being washed away.Using proper methods plants can grow in the bags and reestablish the ecological environment.So slope protection with earth bags can solve the two problems of slope stability and vegetation restoration.This paper mainly introduces the basic position of this method and its construction technology including foundation construction earth bag construction and selection of vegetation. Key words:geotechnical engineering;soil earth bags;revetments;vegetation restoration;construction 河道边岸第四纪松散堆积土坡,其结构疏松,叠法、加筋堆叠法、防护骨架堆叠法等.普通堆叠 力学强度低,极易被地表径流带走,造成边岸侵蚀.法在施工时,首先按照设计坐标放线,地形复杂的 由于水流所搬运土粒的直径与流速的二次方成正区域宜多设置控制点.将装好填料的第1层土袋码 比,对于松散的堆积土,水流可以轻易地将其搬离 放在地基之上,必须保证土袋与垫层完整接触;控 原地;若在土袋内装入密实的堆积土,袋与袋之间 制好各层的立面倾角,顺次码上各层土袋,并必须 通过连接装置组成一个牢固的护坡结构,可阻止土 检查各层土袋纵向平直度和平面水平度.在同一 颗粒被搬走;...
[关键词】岩土工程;土袋;护坡结构;设计 [中图分类号】TU751.5[文献标识码】A[文章编号]1002-8498(2013)13-0068-03 DesignofEarth-bagRevetmentStructureinRiverway Cheng Longfei,He Yunxiang (College of Civil Engineering,Chongqing Three GorgesUniversity,, Chongqing 404000,China) Abstract:In revetment structure design, the force balance under the interactions of flow drag,inertia, buoyancy and effective gravity should be considered firstly.And then, since the earth in the bags is not strictly meet the later restriction,modulus of deformation instead of modulus of pression should be taken to calculate the settlement of earth-bag revetment structure. At last, in practice, the resistance of the bag material against damage from nature or human, the strength decay from long-period ultraviolet rays and fray of silt should also be considered. Key words:geotechnical engineering;earth bags;revetments; design 填充物为砂、碎石、混凝土的土袋结构作为永积减小;当波浪向下回退时,土袋又会受到面向河 久性的工程结构已经广泛运用于堤防工程中。
[关键词】地基;土石混合填方;强夯;动力触探;试验 [中图分类号】TU47【文献标识码】A[文章编号】1002-8498(2015)13-0047-04 Experimental Study ofDynamic Compaction onFoundationFilledwith StoneandSoilMixture YanWenping,WangHongyun (Wuhan Surveying-Geotechnical Research Institute Co.,Lid.ofMCC,Wuhan,Hubei430080,China) Abstract:Experimental study is executed by a series of experiments of dynamic paction in three classes of tamping energy based on the different paction spacing and proportion of soiland stone.Six paction effect is measured by dynamic penetration tests (DPT)and plate loading tests (PLT). The research result shows that the main deformation around the tamper hole is upheaval.Influence of proportion of soil and stone on the deformation around the tamper hole is not obvious.Blow counts of same time, the foundation has a better bearing capacity. Key words:foundations;stone and soil mixture filling;dynamic consolidation;dynamic penetration;tests 0引言等分析了强夯地基土的应力与位移。
2010年4月 施工技术 第39卷第4期 CONSTRUCTION TECHNOLOGY 83 土工膜破坏原因分析及防治措施 郑建华1,许四法2 (1.宁波市建筑工程安全质量监督总站,浙江宁波315010; 2.新江工业大学建筑工程学院,浙江杭州310014) 【摘要]为了防止雨水流人垃圾中形成的海滤液等多种有害物质流人入地下污染地下水以及周围环境,现代垃圾填 埋场都设置了防海系统.防渗系统一般由无纺布、防渗材料以及影润土土工毯等组成,由于在热应力、拉应力以及 穿刺等各种因素的作用下,可能导致防滤系统破坏而使有害物质流人地下.介绍了造成防系统破坏的原因及其 防治措施. [关键词]垃圾填埋场;防渗系统;破坏原因:防治措施 [中图分类号]TU761.11 [文献标识码]A [文章编号]1002-8498(2010)04-0083-02 Destructive Causes Analysis of Geomembrane and Prevention Measures Zheng Jianhua' Xu Sifa? (1.The Chief Supervision Station of Safety and Quality of Construction Engineering Ningbo Zhejiang 315010 China; 2.College of Cioil Engineering and Architecture Zhejiang University of Technology Hangzhou Zhejiang 310014 China) Abstract:The waste landfill should be designed no leachate that may include hazardous materials flowing into surrounding ground and water over long period of years.A seepage system posed of geomembrane geotextile and GCL is installed on the bottom and the side slope of a waste landfill.The seepage system is considered to bear various forces such as tensile force thermal stress and puncture and it would be damaged under the influence of various factors.The main reasons of damage of geomebrane are analyzed and the measures and suggestions on prevention are presented. Key words:waste landfill;seepage system;destructive cause;prevention measure 现代垃圾填埋场设计时都设置了以橡胶、树脂等很大的温度应力.垃圾填埋场的设计填埋年限都在 高分子材料做成的土工膜为主的防渗系统.但是由于15年左右,因此边坡部防渗系统的土工膜在铺设后长 我国垃圾不分类和成分复杂,防渗系统经常遭到破坏时间处于暴露状态,温度随着外界温度变化.另外,生 而渗漏. 垃圾在降解过程中产生较大热...
2010年12月 施工技术 第39卷第12期 CONSTRUCTION TECHNOLOGY 91 土工格室处理高填方新旧路堤施工技术 王家全,周健2,吴辉琴,黄柳云1 (1.广西工学院土木建工程系,广西柳州545006;2.同济大学地下建筑与工程系,上海200092) [滴要]结合山区公路改扩建工程,指出山区高填方新旧路堤容易出现不均匀沉降等问题,根据数值分析结果和现 场实际情况,提出采取土工格室处理方案,重点分析了现场施工控制方法与检测标准,并进行了现场新旧路堤搭接 段深层侧向位移和沉降观测数据分析.结果表明,严格控制现场施工质量,可保证土工格室所在结构层发挥立体 加筋效果,有助于提高新旧路堤的搭接稳定性,降低新旧路堤的不均匀沉降. [关键词]土工格室:新旧路堤:位移:施工技术 [中图分类号]U416.1 [文戴标识码]A[文章编号]1002-8498(2010)12-0091-03 Construction Technology on Geocell Treating High Fill New-old Embankment Wang Jiaquan' Zhou Jian2 Wu Huiqin' Huang Liuyun' (1.Department of Ciil Engineering Guangxi University of Technology Liuzhou Guangxi 545006 China; 2.Department of Geotechnical Engineering Tongji Unisersity Shanghai 200092 China) Abstract:In mountain highway widening projects it is easy to appear differential settlement problem for the mountain high fill new-old embankment.According to the numerical analysis results and field condition the geocell treatment plan is proposed.Then the field construction control method and the examination standard are analyzed in detail.At the same time the in-depth lateral displacement and settlement observation of the field new-old embankment joining sections are analyzed.The results show that the strict controlling field construction quality which may guarantee the geocell structure layers to have a three-dimensional reinforcement effect is helpful to enhance the stability of new-old embankment joining sections and reduce the differential seltlement. Key words:geocell;new-old emb...
[关键词]地基;软土;加筋带;承载力;有限元分析 【中图分类号】TU472.21 [文献标识码]A [文章编号】1002-8498(2014)07-0083-04 ResearchonSandstoneCushionbyReinforcedwithGeotechnical Band and Finite Element Analysis Zhang Tingwang (College ofArchitecture and CivilEngineering,Taiyuan University ofTechnologyTaiyuan,Shanxi030024,China) Abstract:According to the geotechnical reinforcement band performance characteristics, this paper takes sandstone foundation in Shanxi Xinghua College project as an example, and through the foundation bearing capacity test, this paper makes sure the reliability and stability of the whole reinforced sandstone cushion foundation. Through calculating and analyzing the soft soil foundation which is laying in different layers and different laying density reinforced by finite element software PATRAN, this paper ultimately determines the paving pattern of reinforced belt. Key words:foundations;soft soil; reinforced band; bearing capacity;finite element analysis 近年来的实践和研究证明,在软土层不厚的情角洲、湖盆地周围、山润谷地均有分布,由于软土具 基是一种简单经济的处理方法。
[关键词]超深基坑;反向对接;爆破防护;施工技术 [中图分类号】TU753 [文献标识码】A [文章编号】1002-8498(2016)17-0035-05 Reverse Docking ConstructionTechnology ofUltra-deepFoundation Excavation Structures in Soil-rock Stratum Shi Qunkai,Yang Qian,Fan Zuofeng,Wang Qian,Ding Lizhen (China MCC20 Group Co.,Ltd.,Shanghai 201901, China) Abstract;Along with the continuous development of the state construction,geographic conditions of construction areas and their surrounding environmental conditions bee more and more plex. In the few ultra-deep foundation excavation projects constructed in recent years,the circumstances of the construction areas were so plicated that the projects had to be carried out by the bination of excavation and blasting.Besides, the karst fissure development of the rock strata at the lower part of the foundation excavation and the plenty of karst fissure water within the strata lead to rather high requirements for construction safety and environmental protection.This technique takes the swirl pool foundation excavation of Nanjing Steel Wide and Heavy Plate Project as an example and summarizes the technical problems encountered in the project as well as professional development trend of deep foundation excavations in future. Key words;ultra-deep foundation excavation; reverse docking; blasting protection;construction 1工程概况 采用局部深度基坑放坡开挖,即上段挖土卸载放坡 本工程为南钢节能降耗调整产品结构技术改或直立开挖,需要时对坡面进行加固保护,下部基 造项目4700mm轧机工程一标段旋流池工程,旋流坑土体较好时不放坡开挖,故本工程采用了先进行 池位于水处理区域,平流池南侧,结构从上向下依上部松软土放坡开挖、施工结构后,再进行下半部 次由上层顶板、中部1层泵站平台、水池底板及池内爆破开挖后施工结构,最终进行结构对接的方法。
[关键词]隧道工程;土压平衡盾构;固结沉降;数值模拟;应力;变形 [中图分类号】U452 [文献标识码】A [文章编号]1002-8498(2016)17-0109-05 AnalysisofSoilStress-deformationBehaviorCausedbyEarth PressureBalancedShield Zheng Chen', Li Ying',Akagi Hirokazu² (1.College ofMining Technology,Taiyuan University ofTechnology,Taiyuan,Shanxi030024,China; 2.Faculty of Science and Engineering,Waseda University,Tokyo 169-8555,Japan) Abstract:This paper deals with the effects of earth pressure balanced tunneling on the stress path and drainage condition of the soil during tunnel advancement by using PLAXIS. By taking into account the three significant factors of advance rate of the tunnel face,consolidation coefficient of the soil, overburden depth of the tunnel,a parametric study is conducted and a numerical experimental equation proposed for determining drained or undrained soil condition during shield tunnel advancement.Finally, a case study of EPB tunneling is introduced. By using the case study data and results of EPB tunneling on stress path analyses, the proposed equation is verified. Key words:tunnels;earth pressure balanced shield;consolidation settlement;simulation; stresses;deformation 1土压盾构施工过程对土层应力路径的影响 的变化)。
施工技术 2013年1月下 92 CONSTRUCTION TECHNOLOGY 第42卷第2期 土压盾构在砂性土中施工关键技术研究 王新,沈奇2 (1.上海城市建设设计研究总院,上海200125;2.上海城建市政工程(集团)有限公司,上海200065) [摘要]对杭州地铁2号线区间段施工进行现场跟踪,提出砂性土中盾构施工的主要技术难题,并对施工中的关键 技术进行了总结分析.其中采取放慢推进速度均匀推进、改良同步注浆材料、加强二次补浆管理和对注浆补浆设 备养护等措施能够较好地控制地表沉降.向刀盘前方注入膨润土浆液,并通过泡沫改良土稳定土压,持续出土. 向刀盘前方和盾构侧面注人膨润土浆液,可以降低盾构推力和减小刀盘弯矩.采取有效降水止水措施可减少加固 薄弱区可能造成的工程风险. [关键词]隧道工程;土压平衡;盾构;砂性土:施工技术 [中图分类号]TU455 [文献标识码]A [文章编号]1002-8498(2013)02-0092-03 Study of Key Technology on EPB Shield Construction in Sandy Soil Wang Xin'.Shen Qi2 (1.Shanghai Urban Construction Design Research Institute Shanghai 200125 China; 2.Shanghai Urban Construction Municipal Engineering Group)Co.Lad.Shanghai 200065 China) Abstract:In this paper the scene of Hangzhou Metro Line 2 interval segment construction was tracked and the main technical problems were proposed which shield constructed in sandy soils.Then the key technology of construction was analyzed.Taking to slow down the advanced speed and uniform propulsion improved synchronization grouting material to strengthen management of the secondary slurry and equipment maintenance were better measures to control surface settlement.Bentonite slurry which was injected into the front of the cutter and the soil improved by foam were used to stabilize the soil pressure and transport out of soil continued.Injecting bentonite slurry into the.front and side of the shield could reduce the thrust of the shield and reduce the moment of the cutter.Taking effective precipitation and sealin...
[关键词】隧道工程:盾构;土压平衡盾构:砂卵石地层;摇进参数:注浆 [中图分类号]TU761.5;U459.5[文献标识码】A[文章编号】1002-8498(2012)13-0070-05 ConstructionTechnology ofEarthPressureBalance Shield CrossingRiver for LongDistance inSand Gravel Layer Yu Genshe'. Wang Dahai²,Zheng Pengwu' (1.China Communications Construction Co.,Lad.,Bejng 10008s, Chind; 2. CCCC Firs Harbor Enginering Co., Lud.,Tianjin 300042, China) Abstract:Construction Technology for Balanced Shield Crossing River for Long Distance in Sand Grarel Stratum The authors addressed the construction technology for balanced earth pressure shield crossing river for long distance in sand gravel stratum with respect to shield machine transformation, slurry mix proportion, muck improvement, etc. The main control parameters of shield construction in the initial testing phase includes advancing speed,cuter head speed, thrust and torque of cutter head,earth pressure and slurry mix proportion. The construction was progresed strictly following the parameters set in the initial testing phase and the result shows that the cuter hesd maintained good durability, which ensured the safety of long distance tunneling. Key words: tunnels; shields; carth pressure balance shield;sand gravel layer; tunneling parameters; grouting 地铁盾构施工所遇地质因地域的不同具有很装,螺栓连接。
施工技术 2012年4月下 22 CONSTRUCTION TECHNOLOGY 第41卷第363期 土压平衡盾构土仓压力设定与控制方法探讨 杨永强 (中铁一局集团城市轨道交通工程有限公司,院西西安710054) 【摘要]利用现有的土力学理论,对土压平衡盾构推进与停机两种状态下开挖面前方土压力与土仓内土压力类型 进行了分析.通过理论计算和分析,提出了根据开挖面前方地层的地质条件和沉降要求等进行土仓压力设定的方 法,指出了当土仓内土体与开挖面前方土体基本一致时,土仓压力很难与开挖面前方土压力基本相同.通过理论 分析,提出了土仓压力控制的方法,以及果取土仓内土体改良、注人泡沫或高压气体形成气压、严格控制出土量等 控制土仓压力的技术措施. 【关键词】隧道:盾构:土压平衡盾构:土仓压力:设定;控制 [中图分类号]U455 [文献标识码]A[文章编号]1002-8498(2012)08-0022-05 Study on the Method of Setting and Control Earth Pressure in the Earth Pressure Balance Shield Yang Yongqiang Track Traffic Engineering Co.Led.of China Railway No.I Group Xi'an Shaanxi 710054 China) Abstract:Using the existing soil mechanics theory the type of earth pressure between in front of excavation face and in soil warehouse is analyzed when the EPBM is working or out of service.By theoretical calculation and analysis the method is put forward that how to set earth pressure in soil warehouse according to the geological conditions in front of excavation face and sedimentation requirements.It is also pointed out that when the soil inside of warehouse is consistent with that in front of excavation face earth pressure in soil warehouse is difficult to equal to earth pressure in front of excavation face.Through theoretical analysis the method of control earth pressure in soil warehouse is put forward in conjunction with the technical measures that how to control earth pressure by improving soil injecting bubble or forming air pressure by high-pressure gas and strictly controlling...
2014年5月上 施工技术 第43卷第9期 CONSTRUCTION TECHNOLOGY 127 D0I:10.7672/5j52014090127 土压平衡盾构全断面硬岩施工技术 闫建诚 (中国中铁一局集团有限公司,陕西西安710054) [摘要]盾构隧道开挖断面范围为硬岩地层时,存在盾构掘进速度慢、盾构姿态控制难度大、设备及刀具磨损严重 且刀具更换频繁等问题.结合实际工程,介绍了盾构选型、掘进模式选择、盾构掘进参数和盾构姿态控制、刀具管 理等关键措施,确保盾构安全顺利推进. [关键词]隧道工程:盾构;全断面砂层;渣土改良;沉降 [中图分类号]U455.3 [文献标识码]A [文章编号]1002-8498(2014)09-0127-04 Construction Technology of Earth Pressure Balance Shield in the Whole Section Hard Rock Layer Yan Jiancheng China Railway First Group Co.Ltd.Xi'an Shaanxi 710054 China) Abstract:There are some difficulties when tunnel section locating in weathered hard rock stratum such as slow tunneling speed difficulties in controlling shield posture equipment and serious tool wearing and frequent tools replacing.Based on actual project key measures are introduced to ensure the safety and successful shield construction including choosing the reasonable selection of shield and driving mode strictly controlling of shield tunneling parameters and shield posture and strengthening shield tools management. Key words:tunnels;shields;whole section sand layer;soil amelioration;settlement 1工程概况 2.1选型原则 某盾构区间岩石地质条件复杂,既有极为松软 隧道穿越范围围岩强度、裂隙发育程度和地下 的淤泥质土、砂层,又有坚硬的微风化混合岩、辉绿 水含量等地质特征直接决定了盾构机性能要求,选 岩等.岩石平均强度70MPa以上,最大单轴抗压强 择或设计适应地质条件的盾构机很关键,选型主要 度可达159MPa 该区间左、右线分别采用一台海瑞 注意以下几个方面. 克盾构机及一台维尔特盾构机.两台盾构机在设 1)硬岩刀盘的刀具应以滚刀为主,通常设计为 计制造时均考虑了对不同地层的适应性,设计扭矩 滚刀和刮刀可以互换的形式:为防止在巨大的推力 大,推力大.刀盘驱动电机总功率均为945kW 维 下刀具变形,刀座和刀箱均是重型设计;刀盘的开 尔特盾构机设计最大扭矩9550kNm 设计最大推 口率≥25%,以方便石渣进入土仓. 力36000kN;海瑞克盾构机设计最大扭矩5300kN 2...