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在基坑支护工程的设计计算中,由于拟开挖基坑距离已有建筑物与开挖深度相比较小,基坑围护结构所承受的为有限宽度土体的土压力,若根据常规的土压力计算,一般会造成偏大的计算结果,造成不必要的浪费。针对基坑工程中有限宽度土体土压力的计算问题,基于极限分析法的上限定理,推导了有限宽度土体的土压力计算公式,并与经典朗肯土压力的计算结果进行了对比,结果表明:有限宽度土体的土压力分布模式和量值与经典的朗肯土压力分布模式和量值存在着明显的差异,应根据不同土质、有限土体的宽度与基坑的开挖深度之比来计算土压力。
In the design and calculation of foundation pit supporting project, because the pit to be excavated is relatively small compared with the existing buildings and the excavation depth, the earth retaining structure of the foundation pit is subjected to the earth pressure of a finite width soil body. According to the conventional The earth pressure calculation, will generally result in large calculation results, resulting in unnecessary waste. Aiming at the problem of earth pressure of finite width soil in foundation pit project, the formula of earth pressure of finite width soil is deduced based on the upper bound theorem of limit analysis method, and compared with the result of classical Rankine earth pressure. It shows that there are obvious differences between the distribution mode and the magnitude of earth pressure on finite width soil and that of classic Rankun soil. According to different soil types, the width of finite soil and the excavation depth of foundation pit Than to calculate the earth pressure.