数字技木 与应用 学术论坛 基于PSCAD 的220kV 主变加装小电抗对限制短路电流的分析 杨亚奇袁钦鹏邹俊颖2 (1.山东科技大学信息与电气工程学院山东青岛266590; 2.山东电力基建总公司山东济南250101) 要:220kV变电站是电力系统中的重要组成部分,当系统内部发生单相短路故障时,过大的短路电流会对变压器的安全造成极大的威胁而在变压 器中性点加装小电抗是限制故障电流的有效方法本文首先列举了2台并联220kV变压器的4种中性点接地方式然后介绍不同中性点接地方式下小电 抗值的选择方法,最后通过对某地区110kV系统的PSCAD 仿真来验证加装小电抗对限制单相短路电流的作用,并给出限制短路电流的最优解决方案。 关键词小电抗中性点单相短路短路电流 中图分类号TM7 文献标识码A 文章编号:1007-9416(2013)08-0229-03 Abstract :220kV transformer is one of the most importance parts of power grid .The strong short-circuit current causing great threat to the safety of transformer when it occurs a single-phase short .Installing a low reactance on the neutral point of transformer is an effective way .This paper lists four neutral grounding moods of transformer and introduces how to choose the magnitude of low reactance in different neutral grounding moods .At last we use PSCAD to simulate the affect to short-circuit and give the best way to limit it . Key Words :Low reactance Neutral grounding Single phase short Short current 220kV变电站是电力系统中的重要组成部分,其能否安全运行影 X +3X 响到整个电力系统的稳定。随着电力系统容量的不断扩大,发生单相 (1.1) 短路故障时的短路电流也不断增加,甚至有可能会大于其三相短路 式中X为方式1下系统等值零序电抗,X为系统正序电抗, 电流,影响断路器的遮断容量。因此,限制单相接地短路时的故障电 X为加装小电抗值。 流就显得尤为重要,而变压器中性点经小电抗接地可以解决这一问...
粉煤灰综合利用 2016 NO.5FLYASHCOMPREHENSIVEUTILIZATION 设计与施工
地震力作用下楼梯间的常见震害及设计建议 Common Seismic Damage and Design Suggestions of the Stairs under theAction of Earthquake
陈洪昌'，郭鹏飞',付瑛琪² （1.河北建研科技有限公司，石家庄050000;2.中国兵器工业集团北方工程设计研究院有限公司，石家庄050000） 摘要：历次地震震害都出现了结构楼梯间严重破坏的情况，导致撤离路线出现障碍而造成人员伤亡。
关键词：地聚合物；粉煤灰；玄武岩纤维；VAC/E可再分散乳胶粉；压折比；干缩率 中图分类号：TU502文献标识码：A文章编号：1005-8249（2018）02-0008-04 Ji Xiaoli, Li Xi (Shanghai Liyang Road Reinforcement Technology Co, Ld. Shanghai 201599) Abstract: O theasis of thminal powe sdi silcate stm epolyr, tsolve t the eas shinke racking, strng bitlen d shinkrcnbyadng kins ftrilyhalta/reieile latx pwe heningth gp results shw that the aditionf the three materials an snifcntlymprove the self shnkae of the system, the touhes and crack restae of the geplyr tIapiate t faxtre, theekindfmaials caneae tel segth f th plt and reduce the ratio of pressive strength and the rate of dry shrinkage. Keywords: polymer; fl ash; basalt fber, vinyl acetate and ethylene coplyerized VAC/Eredispersible latex powder; ratio of pressive strength to flexural srength (C/F） ; the rate of dry shrinkage 地聚合物是以黏土、工业废渣、粉煤灰或矿渣与常规建筑材料相容性好；④具有良好的耐酸碱腐蚀 为主要原材料，添加合适的活性激发剂，经过适当性、耐高温性能；5工艺简单，较多使用工业废渣等， 的工艺处理，在常温下通过化学反应即可得到的一是一种环境友好型绿色建筑材料。
施工技术 2011年11月下 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 (中国科学院电工研究所,北京100190) 摘要】针对中关村青年公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 ( Instituteof 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 ;prestressi...
2011年12月下 施工技术 第40卷第355期 CONSTRUCTION TECHNOLOGY 37 土钉支护基坑阳角的冗余度研究 王海旭，程雪松，郑刚2 (1 天津大学土木工程系，天津300072；2.滨海土木工程结构与安全教育部重点实验室，天津300072) [摘要]基坑阳角是变形控制的不利位置，在设计中应予以重点加固.在基坑工程领城引入冗余度设计理论的概 念，对土钉支护基坑的阳角进行腰梁加固，并对其元余度进行分析.对比分析了原体系与元余体系的坑壁水平位 移、土钉轴力等内容；研究了局部土钉失效时，土钉腰梁支护体系的工作状况.结果证明对土钉支护基坑的阳角 进行腰梁加固能够有效控制危险位置位移，转移冗余荷载，增加荷载传递路径，即能够提高支护体系冗余度. [关键词]地下工程；基坑；阳角；土钉；元余度 [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 of Foundation Excavation Convex Location Supported by Soil Nailing Wang Haixu' Cheng Xuesong' Zheng Gang㎡ (1.Department of Civil Engineering Tianjin University Tianjin 300072 China; 2.MOE Key Laboratory of Coast Civil Structure Safety Tianjin 300072 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...
2011年4月上 施工技术 第40卷第338期 CONSTRUCTION TECHNOLOGY 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]土订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452借助准黏聚力理论认为土体中设置土钉后体的内摩擦角不变而粘聚力变大土体 的抗剪强度增强。而且在上体中设置上钉后,改变了土体的应力状态,主应力方向发生偏转,体的滑裂面相应改 变。通过对土钉支护结构中的土体单进行应力分析,得出了垂直基坑中土钉支护结构滑移面的破裂角为45°+ 2-8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 ( Instituteof 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 is 45 +/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 formu...
2012年8月上 工技术 第41卷第370期 CONSTRUCTION TECHNOLOGY 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 Chongqing Three Gorges College ,Chongqing 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 ...
[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】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。