摘要
为分析一维稳态流下非饱和土的主动土压力,将基质吸力的竖直分布应用于Bishop非饱和土抗剪强度理论中,考虑土拱效应分析墙后非饱和土的应力状态,基于有限差分法建立非饱和土的主动土压力、合力及其作用位置的计算方法。计算结果表明:由于墙面剪应力的作用,挡土墙上部的主动土压力大于扩展朗肯主动土压力,下部的主动土压力小于扩展朗肯主动土压力,扩展朗肯主动土压力是该土压力解的一个特例;地下水位与流动比是影响非饱和土主动土压力的关键因素。
In order to analyze the active earth pressure of unsaturated soil under one-dimensional steady flow,the vertical distribution of matric suction was applied to the Bishop theory of shear strength of unsaturated soil.Considering the soil arch effect,the stress state of unsaturated soil behind the wall was analyzed.Based on the finite difference method,the calculation method of active earth pressure,resultant force and its position of unsaturated soil was established.The calculation results show that,due to the wall shear stress,the active earth pressure at the upper part of the retaining wall is greater than the extended Rankine active earth pressure,and the lower active soil pressure is less than the extended Rankine active earth pressure.The extended Rankine active earth pressure is a special case of the soil pressure solution.The groundwater level and the flow ratio are the key factors affecting the active earth pressure of unsaturated soil.
出处
《铁道建筑》
北大核心
2019年第12期109-113,共5页
Railway Engineering
基金
中国铁道科学研究院基金(2018SZ05)
关键词
主动土压力
非饱和土
理论分析
挡土墙
稳态流
土拱效应
active earth pressure
unsaturated soil
theoretical analysis
retaining wall
steady flow
soil arching effect
