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为解决基坑工程中由于设备限制CFG桩必须在部分已开挖基坑内进行施工,引起基坑周围地表出现明显的开裂的问题.采用MIDAS/GTS有限元软件建立有限元模型,对不同的施工工况进行模拟,分析施工过程中基坑围护结构的变形以及对周围土体的影响.研究结果表明:CFG桩在部分开挖基坑内施工对基坑底部被动土压力区造成扰动,致使该处土体强度降低,从而导致基坑周围土体变形较大,造成周围地面开裂.由此提出了部分开挖基坑内施工CFG桩的合理方案,为将来类似工程的设计和施工提供指导性意见.
In order to solve the problem of obvious cracking of the ground around the foundation pit due to the equipment confining the CFG piles in some excavation foundation pit in the foundation pit project, the finite element software MIDAS / GTS was used to establish the finite element model for different construction The simulation results show that the CFG pile in the partially excavated foundation pit will cause disturbance to the passive earth pressure zone at the bottom of the foundation pit, which results in the deformation of the foundation pit retaining structure and the influence on the surrounding soil during the construction process. The strength of the soil decreases, which leads to the deformation of the soil around the foundation pit to be large, resulting in the cracking of the surrounding ground.Therefore, a reasonable scheme for the construction of CFG piles in some of the excavation pit is proposed, providing guidance for the design and construction of similar projects in the future .