摘要
运用有限单元法对考虑渗流影响的基坑施工过程进行分析,并给出了基坑降水及开挖引起的侧向位移曲线、坑后沉降位移曲线。运用考虑渗流影响的基坑开挖三维有限元模型对实际基坑工程进行施工过程模拟,通过与实际监测数据的对比验证了该有限单元法的正确性,并分析了降水、开挖对基坑变形的影响。分析表明,前期基坑降水将导致基坑侧向位移的增加,随着开挖深度的增加,后期基坑降水对侧向位移的影响很小,开挖对侧向位移的影响明显大于降水的影响;降水和基坑开挖都将逐渐增大基坑后土体的沉降位移,其中降水引起的沉降位移均小于开挖引起的沉降位移。
By using the finite element method,seepage effect on the pit construction processes were simulated,and the lateral deformation & settlement deformation behind the foundation pit caused by foundation pit dewatering and excavation were proposed. Using the foundation pit excavation 3 D finite element analysis model,the excavation processes of practical engineering was simulated,and the finite element method was verified through the site monitoring method. Then the effect of foundation pit dewatering and excavation on foundation pit deformation was analyzed. The results show that the lateral deformation will be increased caused by early stage foundation pit dewatering,with the depth of excavation increased,the effect of dewatering on lateral deformation will be weakened; the effect of excavation on lateral deformation is greater than dewatering,and the settlement deformation will be gradually increased caused by dewatering and excavation,while the effect of excavation on settlement deformation is also greater than dewatering.
出处
《建筑结构》
CSCD
北大核心
2018年第S1期804-807,共4页
Building Structure
基金
国家自然科学基金资助项目(51208181)
“十二五”国家科技支撑计划资助项目(2011BAJ10B08)
江苏省“333高层次人才工程”资助项目(1105000207)
关键词
基坑
渗流
有限元
施工过程
变形
foundation pit
seepage
finite element
construction processes
deformation
