盾构始发井基坑施工监测及分析

Results of and Analysis on Monitoring for Construction of Foundation Pits of Shield Machine Launching Shafts

介绍盾构始发井基坑的施工监测结果及分析。对连续墙变形、支撑轴力、地面沉降、土体变形、地下水位等项目进行了监测,得到了基坑开挖过程连续墙侧向位移、土体侧向位移等的变化情况,并根据监测结果及时调整支撑安装顺序、局部增设临时支撑,从而有效控制了连续墙变形,保证了基坑的稳定。

The results of and analysis on the monitoring for the construction of a foundation pit of a shield machine launching shaft is presented in the paper. Monitoring is performed for the deformations of the diaphragm walls, the axial forces of the retaining structures, the ground surface subsidence, the ground deformations and the ground water levels, therefore the variations of the lateral displacement of the diaphragm walls and that of the ground occurring during the excavation of the foundation pits are obtained. On basis of the monitoring results, the installation sequence of the retaining structures is timely adjusted and temporary local supports are installed so as to bring the deformation of the diaphragm walls under effective control so that the stability of the foundation pit can be guaranteed.