基于Midas-GTS的基坑开挖数值模拟分析

NUMERICAL SIMULATION ANALYSIS OF FOUNDATION PIT BASED ON MIDAS-GTS

结合上海某软土地区的某基坑工程实例,通过分析该工程的实际状况,使用有限元分析软件Midas-GTS,建立了可行的基坑开挖有限元模型,并对模型进行了定性分析。通过软件的后处理功能,提取相应的变形位移等数据,详细地进行了地下连续墙的水平位移分析和坡顶沉降分析,并在不同工况对比下,分析了地下连续墙深度对地下连续墙的水平位移的影响。结果表明,在基坑开挖过程中,地下连续墙的最大侧向位移随着基坑深度不断加深而逐渐增大,并且最大值产生位置的深度也不断下降。同时距离较差土质较近的区域基坑发生的变形较大,故在开挖过程中要充分考虑到基坑附近土质情况对基坑开挖的影响,并做好进一步的加固措施,以此保证基坑开挖的稳定。

Combining with a foundation pit project of a soft soil area in Shanghai, a feasible finite element model of foundation pit excavation is established by analyzing the actual situation of the project and using the finite element analysis software Midas-GTS, and the qualitative analysis of the model is carried out. Through the post-processing function of the software, the corresponding deformation and displacement data are extracted and carried out in detail. Horizontal displacement analysis of diaphragm wall and settlement analysis of slope top are carried out, and the influence of diaphragm wall depth on horizontal displacement of diaphragm wall is analyzed under different working conditions. The results show that the maximum lateral displacement of diaphragm wall increases with the deepening of foundation pit, and the depth of the maximum position decreases. At the same time, the deformation of the foundation pit is larger in the area close to the poor soil, so the influence of the soil condition near the foundation pit should be fully considered in the excavation process, and further reinforcement measures should be taken to ensure the stability of the foundation pit excavation.