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圆形地下连续墙作为一种受力合理的围护结构,由于空间“拱效应”的存在,作用在拱圈上的土压力主要在地下连续墙内自身平衡,地下连续墙的水平位移相对较小。基于某深大圆形基坑工程实际,采用离心模拟技术研究基坑开挖过程中基坑围护结构的水平位移和弯矩分布规律。分析表明,基坑地下连续墙最大水平位移为11.6mm,位于上部基坑的中下部,并且随着开挖深度增大,墙体位移逐渐增大且最大位移点不断下移。研究成果可为圆形基坑开挖和支护过程中围护结构的变形规律分析提供参考。
As a kind of force-supporting enclosure structure, circular underground continuous wall is mainly composed of self-balancing underground diaphragm wall and horizontal displacement of diaphragm wall due to the existence of space “arch effect” Relatively small. Based on the engineering practice of a deep circular foundation pit, centrifugal displacement simulation is used to study the horizontal displacement and bending moment distribution of the foundation pit retaining structure during excavation. The analysis shows that the maximum horizontal displacement of the diaphragm wall is 11.6mm, which is located in the middle and lower part of the upper foundation pit. As the excavation depth increases, the displacement of the wall gradually increases and the maximum displacement point moves down continuously. The research results can provide a reference for the deformation analysis of the retaining structure during the excavation and support of the circular foundation pit.