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以某地铁车站基坑为背景,通过有限元数值分析的方法,对比分析深基坑两侧围护结构在不对称水压和对称水压作用下内力及变形的变化规律,以期对类似工程设计施工提供经验指导。分析结果表明:不对称水压下基坑围护结构向水压力小侧发生一定偏移变形,导致水压力较大侧围护变形增大,对基坑安全和环境保护不利,而不对称水压对围护内力分布影响不大;对比对称水压工况,不对称水压下高水位侧围护内力基本不变,而低水位侧围护内力减小明显,同时一侧水位降低后支撑轴力明显减小,减小之和与围护体系两侧水头差相当;后期开挖的坑内土体随着坑内降水不断固结沉降,将引起基坑围护结构的变形。
Taking the foundation pit of a metro station as a background, the variation regularities of internal forces and deformations under different asymmetrical and symmetrical hydraulic pressures are compared and analyzed by means of finite element method (FEM) Construction provides experience guidance. The analysis results show that the deformation of the retaining structure of the foundation pit to the small side of water pressure under asymmetric water pressure causes some deformation and deformation, which results in the deformation of the surrounding water jacket with larger water pressure, which is unfavorable to the safety of foundation pit and the environment protection, while the unsymmetrical water Comparing with the symmetrical water pressure conditions, the internal force of the high water level retaining wall under the asymmetric water pressure is basically unchanged while the internal force of the low water level retaining wall reduces obviously while the water level on one side reduces and then supports The axial force is obviously reduced, and the sum of the reduction is similar to that on both sides of the containment system. The soil in the late excavation will be consolidated and settled with the precipitation in the pit, which will cause the deformation of the retaining structure of the foundation pit.