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通过理论分析和数值模拟对现行规范规程中有关基坑周边局部荷载引起支护结构上附加土压力的计算进行讨论。从弹性理论解确定了附加土压力值最大点的位置;利用有限元法对比分析了土体抗剪参数c和φ对附加土压力弹塑性解的影响,发现其与静止侧压力系数呈正比;针对土体分层情况,利用有限元法分析附加土压力的分布形式,并与均质地基时的情况进行对比;针对基坑周边建筑物荷载的作用,分析基础埋深对附加土压力的影响。
The theoretical analysis and numerical simulation are used to discuss the calculation of the additional earth pressure on the supporting structure caused by the local load around the foundation pit in the current code of practice. The position of the maximum point of additional earth pressure is determined from the elastic theory solution. The influence of soil shear parameters c and φ on the elastic-plastic solution of additional earth pressure is contrasted and analyzed by finite element method and found to be proportional to the static lateral pressure coefficient. According to the stratification of soil, the distribution of additional earth pressure is analyzed by finite element method, and compared with the case of homogeneous foundation. The influence of basic depth on the additional earth pressure is analyzed according to the effect of building load around the foundation pit .