2011年12月上施工技术 第40卷第354期CONSTRUCTIONTECHNOLOCY81
深基坑柔性叠加支护结构施工技术
严晓新'，李宗明"，黄延铮² (1.华北水利水电学院土木与交通学院，河南郑州450011；2.中国建筑第七工程局有限公司，河南郑州450004） [摘要］随着社会市场经济的发展，大量的高层、超高层建筑以及地下工程不断涌现，距原有建筑物的间距越来越 小，支护结构的造价急剧增加。
针对深基坑地下连续墙、防渗椎幕及其之间土体组成的柔性叠加支护结构，使用有 限元软件ANSYS分析模拟地下连续墙的受力和变形，并以不同内支撑方式作了多方案比较，在实际工程施工中及 时进行信息采集，和计算结果相比较，并界定了使用该计算方法的边界条件。
工程实践表明，该结构的受力和变形 计算结果更符合工程实际，与传统计算方法相比，水平位移减少30%，从而降低支护造价20%左右。
[关键词】基坑；支护结构；地下连续墙：水平位移；监测 [中图分类号】TU753【文献标识码】A【文章编号】1002-8498(2011)23-0081-04 ConstructionTechnology in theSupportingStructure withFlexible SuperpositionforDeepFoundationExcavation Yan Xiaoxin'，Li Zongming'，Huang Yanzheng² (1.Civil andTraffic College，North China University of Water Resources and ElectricPower， Zhengzhou,He'nan 450011, China; 2.China Construction Seenth Engineering Division.Corp.Ltd.,Zhengzhou,He'nan450004，China) Abstract:As the developing of economic, many super high-rise and high-rise buildings and underground engineerings appear continuously, leading to a much smaller distance between existed buildings and a higher cost of supporting structure. Based on underground diaphragm wall and anti-seepage curtain for deep foundation excavation,the supporting structure with flexible superposition posed of soil between them,finite element analysis software ANSYS is used to analyze and simulate the stress and deformation condition of underground diaphragm wall,several schemes are contrasted by different inner support patterns,the information is collcted in time during practical engineering construction,pared with calculation results,the boundary conditions are defined by the calculation method. Engineering practice shows that the calculation results of the stress and deformation for the structure are more coincident with practical engineerings,pared with traditional calculation method，horizontal displacement reduces 30% ,thus support cost reduces about 20%. Key words: foundation excavation; supporting structure; underground diaphragm wals; horizontal displacemen...
