基于有限元法基坑组合支护体系设计及监测验证分析  

The application of finite element method in the design of combination retaining systems of foundation pit and the validation analysis of monitoring

作　　者：耿冬青[1] 张志平 宋福渊 程学军 尹文斌 

机构地区：[1]中国建筑股份有限公司技术中心,北京101300 [2]中建国际建设有限公司,北京100026

出　　处：《建筑结构学报》2010年第S2期315-319,共5页Journal of Building Structures

摘　　要：以北京某深基坑组合支护工程为例,采用有限元法对上部(复合)土钉墙和下部锚拉桩(墙)组合支护体系进行数值模拟分析,并根据数值计算结果进行组合支护体系设计。通过对各施工工况下基坑土体及支护结构的位移、内力进行现场数据监测,并对监测数据进行科学分析,验证设计的合理性。研究结果表明,基于有限元法的组合支护体系设计与监测数据分析结果有较好的拟合性,说明有限元法是一种较为有效的组合支护设计方法。同时表明基坑采用组合支护结构时,下部锚拉桩(墙)施工对上部(复合)土钉墙的位移影响较大,另外将上部(复合)土钉墙视作能够抵御其身后水土压力及变形破坏的挡土墙更符合实际情况。Taking a deep foundation project in Beijing as an example,this paper uses the finite element method to simulate the cooperation action of combination retaining systems of(composite) soil nailing walls and row piles(or diaphragm walls) supported by anchors.The combination retaining systems are designed based on numerical simulation results.Through data monitoring and data analysis on the deformation and the internal force of soil and retaining structures under all construction conditions,the design rationality is validated.The study indicates that the finite element results of combination retaining systems agree well with the monitoring data,showing the finite element method is an effective design method for combination retaining systems of foundation pits.It is also shown that the existing of row piles(or diaphragm walls) supported by anchors influences significantly the displacement of(composite) soil nailing walls.The(composite) soil nailing walls is suggested to be regarded as an abamurus that resists water-soil pressure and distortion.

关 键 词：基坑 组合支护体系 有限元法 监测验证分析 

分 类 号：TU753[建筑科学—建筑技术科学]