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针对挡土结构土压力与位移之间的关系,提出一种适用于既有地下室外墙影响下的挡土结构非极限主动土压力计算方法。基于卸荷路径推导了土体力学参数与位移的关系和考虑土拱效应下的非极限主动土压力系数;运用应力状态法和静力平衡法给出既有地下室外墙影响下的非极限主动土压力统一解;通过与室内相关模拟试验对比,采用应力状态法得到的结果较静力平衡法更接近于实际;基于挡土结构非极限主动土压力变化规律,讨论了位移比、两墙间距、墙土摩擦角、黏聚力等参数对土压力分布、合力及倾覆力矩的影响,揭示了既有地下室外墙影响的非极限主动土压力变化规律。
Aiming at the relationship between earth pressure and displacement of retaining structure, a non-limit active earth pressure calculation method for retaining structure under the influence of existing external wall of the basement is proposed. Based on the unloading path, the relationship between soil mechanics parameters and displacement was deduced and the non-limit active earth pressure coefficient under soil arching effect was considered. By using the stress state method and static balance method, the non-limit active Through the comparison with the indoor simulation test, the results obtained by the stress state method are more realistic than the static equilibrium method. Based on the variation of the non-limit active earth pressure of the retaining structure, the displacement ratio, the distance between the two walls , Soil friction angle, cohesion and other parameters on the distribution of earth pressure, resultant force and overturning moment, reveals the existing underground wall impact of non-limit active earth pressure variation.