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为研究地下室外墙土压力分布状态与基坑支护桩的关系,探究支护结构和地下主体结构在永久工况下的相互作用机理,借助Plaxis-3D有限元软件对采用桩锚支护的某基坑工程进行全工况的有限元模拟,发现支护桩的存在对地下室外墙土压力分布有明显的影响:土压力沿深度方向先增大后减小,呈弧线形分布;地下室外墙最大内力值明显减小,挡土能力显著增强。通过对多个工程的模拟结果进行拟合得到地下室外侧土压力分布曲线,对该曲线简化后进行地下室外墙内力的计算分析,计算结果证实,按简化曲线计算所得地下室外墙内力值与模拟值较为吻合,即该简化曲线在济南市工程地质条件下具有较好的适用性,可为支护桩存在条件下的地下室外墙设计提供参照。
In order to study the relationship between the distribution of earth pressure on the basement wall and the supporting piles of the foundation pit, the interaction mechanism between the supporting structure and the underground main structure under permanent working conditions was explored. With the aid of Plaxis-3D finite element software, Finite element simulation of the whole working condition of a foundation pit project shows that the existence of the retaining pile has obvious influence on the earth pressure distribution in the basement wall. The earth pressure firstly increases and then decreases in the depth direction and distributes in an arc shape. The basement The maximum internal force of external walls is obviously reduced, and the ability of retaining soil is obviously enhanced. Through the fitting of simulation results of several projects, the curve of earth pressure on the outside of the basement is obtained. After the curve is simplified, the calculation and analysis of the internal force of the external wall of the basement is carried out. The calculation results confirm that the calculated values of the internal force and the simulated value The results show that the simplified curve has good applicability under engineering geological conditions in Jinan City, which can provide references for the design of basement wall in the presence of supporting piles.