泉域承压水地层基坑降水对周围场地沉降的影响

Influence of foundation dewatering on the surrounding site settlement in spring-confined water area

为了保证济南西站深大基坑降水的施工安全,构建了场地一地下连续墙一降水井模型,开展了深大基坑降水井降水过程有限元分析,分析了深大基坑的降水过程中地下水位的变化过程,进一步研究了基坑降水对周围场地沉降的影响。研究指出:基坑内地下水位的下降直接影响了基坑的位移沉降,地下连续墙起到了重要的防水隔水以及基坑保护的作用,随着相对基坑的距离越来越远,周围场地的沉降量也越来越小。研究成果可以为泉域承压水地层深大基坑降水关键技术提供重要的理论依据和工程应用经验。

To ensure the construction safety of deep and large foundation pit dewatering in Jinan West Station,the site-diaphragm wall-dewatering well model is built,and the finite element analysis of dewatering process of deep and large foundation pit dewatering wells is carried out.The change process of groundwater level during dewatering of deep and large foundation pit is analyzed,and the influence of foundation pit dewatering on surrounding site settlement is further studied.The study points out that:the decline of groundwater level in the foundation pit would directly affect the displacement and settlement of the foundation pit,and the diaphragm wall plays an important role in waterproof and waterproof as well as foundation pit protection.With the distance from the foundation pit getting farther and farther,the settlement of the surrounding site is also getting smaller and smaller.The research results of this paper can provide important theoretical basis and engineering application experience for the key technologies of deep and large foundation pit dewatering in the confined water layer of the spring region.