地铁车站基坑开挖稳定性分析

依托成都地铁5号线中医大省医院站，利用有限差分法，模拟砂卵石地层的基坑分步开挖和排桩内支撑加固大断面异形基坑的支护形式，分析大断面地下空间开挖的变形影响范围和邻近建（构）筑物稳定性，并结合实际监测数据提出合理的防护措施。

Stability Analysis of Foundation Pit Excavation in Metro Station

In order to study the law how the excavation of large section underground space affects the deformation and surface displacement of adjacent structures, herein the excavation works of super-large section underground space at the metro station of Chengdu University of TCM and Sichuan Provincial People's Hospital was depended to study the stepped excavation of foundation pit in sandy cobble stratum with finite difference numerical simulation. The support system of large section irregular foundation pit was strengthened by internal bracing of piles in row. The deformation effect and stability in such excavation was then analyzed with the proper protection measures proposed according to the monitoring data, which provides technical support to the study of excavation of large section underground space in sandy cobble stratum.