某地铁车站深基坑施工期周围土体地表沉降监测与数值分析

Deformation Monitoring and Numerical Analysis of Surface Subsidence of a Deep Foundation Pit in Construction

以某地铁车站深基坑工程为研究背景,介绍了该工程周边环境、结构型式及拟建场区的地质条件;根据该工程特点将该工程分为四个典型工况,并根据各个工况结束时测得的基坑周围土体沉降结果,分析了该基坑在开挖过程中土体沉降规律;通过建立三维模型对基坑开挖过程中周围土体沉降情况进行了数值模拟,并将计算结果与实测结果进行对比分析,最终得到基坑开挖过程中周围土体沉降规律及影响范围。本文的研究成果可作为深基坑设计与制定施工方案的科学依据。

Based on a deep foundation pit of a subway station,the paper introduces the project＇s surroundings,structural type and the geological conditions of the proposed field.According to the engineering characteristics,the project was divided into four typical operating conditions.Based on the results of surface subsidence measured in the end of each condition,the paper analyzes the variation of surface subsidence in the excavation process.Through the establishment of three-dimensional model of the subway station,the surface subsidence is simulated by numerical analysis,and compared with experimental results,eventually the regularity of surface subsidence of a deep foundation pit and the influence sphere of earth excavation are obtained.The results of the paper can provide references for deep foundation pit design and construction.