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在软土地区采用悬臂式支护结构易造成基坑周边地表沉降过大,工程中常采用坑底加固措施达到减少侧向位移的目的。为了得到坑底加固土体对地表沉降的影响规律,首先以弹性地基梁法为基础建立了基坑的有限元模型,利用建立的模型和地表沉降理论分析了坑内土体的加固深度及程度对地表沉降的影响。结果表明,地表沉降随基坑内土体加固深度及程度的增大而减小,而且还存在着临界加固深度及程度。因此,合理地确定坑内土体的加固深度及程度既能保证周边建筑物的安全,又能够节省工程造价。
In cantilevered support structure in soft soil area, it is easy to cause the settlement of ground surface around the foundation pit is too large. In the project, the reinforcement measures at the bottom of the pit are often used to reduce the lateral displacement. In order to get the rule of the influence of ground reinforcement on the settlement of ground surface, the finite element model of foundation pit is established based on the elastic foundation beam method. The depth and degree of reinforcement of the soil in the pit are analyzed by using the established model and surface subsidence theory Impact of surface subsidence. The results show that the settlement of the ground surface decreases with the increase of the depth and degree of soil reinforcement in the foundation pit, and the depth and extent of the critical reinforcement also exist. Therefore, it is reasonable to determine the depth and extent of reinforcement of the soil in the pit can not only ensure the safety of the surrounding buildings, but also save the construction cost.