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武汉鄂钢旋流沉淀池深36.5m,直径26m,在其基坑开挖范围内同时存在土层和岩层,采用地下连续墙结合分层逆作的内衬墙作为基坑围护结构,地下连续墙仅在土层中设置,而内衬墙分六层逆作在土层和岩层中设置。应用大型通用有限元软件ANSYS对该基坑工程分别模拟了采用内衬墙分层逆作法和不采用内衬墙两种情况下的地下连续墙以及围岩的内力和变形,对比分析了内衬墙分层逆作法在基坑开挖过程中的作用。根据分析结果,内衬墙具有限制地下连续墙和围岩体变形以及减小连续墙环向压应力的作用;内衬墙的作用与地下连续墙的侧向变形有关,当地下连续墙侧向变形较小时,内衬墙的作用有限。基于此,作者提出了对传统内衬墙逆作法施工工法优化的建议。
Wuhan E steel swirling sedimentation tank 36.5m deep, diameter 26m, in the excavation of the excavation within the scope of both soil and rock layers, the use of underground continuous wall with stratified reverse wall as the foundation pit retaining structure, underground The continuous wall is only set in the soil layer, while the lining wall is arranged in the soil layer and the rock layer in six layers. The large-scale common finite element software ANSYS was used to simulate the internal forces and deformations of the diaphragm wall and the surrounding rock in the foundation pit project by using the liner lining stratification reverse method and without using the lining wall respectively. The Role of Wall Stratified Reverse Method in Excavation of Foundation Pit. According to the analysis results, the lining wall has the function of limiting the deformation of the diaphragm wall and the surrounding rock mass and reducing the circumferential compressive stress of the diaphragm wall. The function of the lining wall is related to the lateral deformation of the diaphragm wall of the underground diaphragm wall. When the deformation is small, the role of the lining wall is limited. Based on this, the author put forward the proposal of optimizing the construction method of the traditional lining wall by the reverse method.