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利用FLAC数值模拟软件,针对软土超深基坑,通过5组模型计算,研究了地连墙插入深度、墙趾土层特性、基坑宽度、坑内工程桩对抗隆起稳定的影响规律以及作用机理。结果表明地连墙插入深度、墙趾土层特性、基坑宽度和潜在滑裂面之内的工程桩对基坑抗隆起稳定有着非常明显显著的影响。在此基础上,研究了软土深基坑坑底隆起失稳破坏时滑裂面的形状和位置等特征以及其影响因素,得到了软土深基坑隆起失稳破坏机制。
By using FLAC numerical simulation software, the effect of penetration depth of wall to wall, soil properties of foundation toe, width of foundation pit, confrontation and uplift stability of pit piles and mechanism of action are studied through five sets of model calculations for ultra deep foundation pit of soft soil. . The results show that the depth of ground wall insertion, wall toe soil properties, the width of the foundation pit and the potential slip surface within the engineering pile on the anti-raising stability of foundation pit has a very significant impact. On this basis, the shape and location of slip surface and its influencing factors in the failure of deep foundation pit excavation and failure are studied, and the instability and failure mechanism of deep foundation pit in soft soil is obtained.