刚性挡土墙粘性填土被动土压力简化计算  

SIMPLIFIED METHOD FOR CALCULATING THE PASSIVE EARTH PRESSURE OF COHESIVE BACKFILL AGAINST RIGID RETAINING WALLS

作　　者：彭俊国 朱彦鹏[1] PENG Jun-guo;ZHU Yan-peng(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050

出　　处：《工程力学》2022年第5期204-209,223,共7页Engineering Mechanics

基　　金：甘肃省自然科学基金项目(20JR10RA169);国家自然科学基金面上项目(51978320,51978321);土木工程减震隔震技术研发甘肃省国际科技合作基地培育项目(TM-QK-202001)。

摘　　要：利用水平条分法计算刚性挡土墙粘性填土的被动土压力,得到了刚性挡土墙粘性填土时被动土压力的非线性分布表达式且计算模型满足切应力互等定理。根据摩尔-库仑准则得到侧压力系数的计算公式,并且得到了被动土压力合力的简便公式。通过两种计算模型讨论了土条带间切应力增量对被动土压力影响。将计算结果与现有经典理论进行对比分析,结果表明:当挡土墙墙背光滑且无均布荷载时该文计算公式退化为Rankine公式,当填土为无粘性土时,该文方法所得结果与考虑土拱效应的经典文献结论趋于一致,并且与现有的试验结论保持一致。The horizontal slice element method for calculating the passive earth pressure against rigid retaining walls is extended to cohesive backfill. The formula of the nonlinear distribution of passive earth pressure is derived to satisfy the reciprocal theorem of shear stress. According to the Mohr-Coulomb theory, the lateral passive earth pressure coefficient can be determined, and a simplified expression of the total passive force is obtained. The influence of the shear stress increment between soil strips on the passive earth pressure is discussed by two calculation models. The results are compared with the existing classical theory. The comparison shows that the formula in this paper degenerates to the Rankine formula when there is no uniformly distributed load. If the backfill is cohesionless soil, the results are consistent with those in the literature that considered the soil arching effect. The calculated results are also consistent with the existing experimental results.

关 键 词：被动土压力 刚性挡土墙 水平条分法 粘性土 切应力互等定理 

分 类 号：TU432[建筑科学—岩土工程]