地下水位不同的基坑开挖对地面沉降影响的数值模拟研究

Numerical simulation study on the influence of foundation pit excavation with different groundwater levels on land settlement

现阶段含地下水的基坑已相当普遍,那么若地下水位置不同,但基坑开挖、排水和支护措施相同的情况下,地面沉降是否相同,针对此问题,选择两个工程地质相同、但地下水位线不同的基坑,其次通过MIDAS GTS完整还原基坑开挖、排水和支护的全过程,最后分析以上两种基坑的处置对地面沉降的影响。研究结果表明,若地下水位较浅,且地下水位线接近的基坑,相同的处置措施对地面沉降的影响相近,此研究成果可为类似的基坑工程做参考。

At this stage, the foundation pit with groundwater is quite common. If the groundwater location is different, but the foundation pit excavation, drainage and support measures are the same, whether the ground settlement is the same. To solve this problem, this paper first selects two foundation pits with the same engineering geology but different groundwater level lines, and then completely restores the whole process of foundation pit excavation, drainage and support through Midas GTS. Finally, the influence of the above two kinds of foundation pit disposal on land settlement is analyzed. The research results show that if the groundwater level is shallow and the groundwater level is close to the foundation pit, the impact of the same treatment measures on land settlement is similar. This research result can be used as a reference for similar foundation pit projects.