摘要
基于统一强度理论和非饱和土双应力状态变量抗剪强度,合理考虑中间主应力效应,建立了非饱和土双应力状态变量抗剪强度统一解,并与文献试验结果进行比较,验证了公式的正确性;进而考虑基质吸力的不同分布,得到非饱和土主动土压力和被动土压力统一解,克服了朗肯土压力的不足,并得出中间主应力和基质吸力对土压力的影响特性。研究结果表明,主动土压力随着统一强度理论参数和基质吸力的增大而不断减小,被动土压力则相反;当基质吸力沿深度线性减小时,主动土压力和被动土压力都不像基质吸力沿深度为常数时变化得那么快。该结果为非饱和土抗剪强度和土压力分析提供了理论依据,对工程设计有一定的参考价值。
Considering the effect of the intermediate principal stress rationally,the unified solution of shear strength for unsaturated soils in terms of two state stress variables is presented,which is based on the unified strength theory and shear strength for unsaturated soils in terms of two state stress variables. Good agreements can be found between the results of this study and some results reported in the literatures. The proposed unified solution of shear strength for unsaturated soils in terms of two state stress variables is validated. With different distributions of matric suction,the unified solutions of active and passive earth pressures for unsaturated soils are deduced,which can avoid the shortages of Rankine earth pressures. The effects of the intermediate principal stress and matric suction on earth pressures are discussed. It is shown that the active earth pressure decreases with increasing the unified strength theory parameter or matric suction,whereas the passive earth pressure inverses. The active and passive earth pressures do not change more quickly when matric suction decreases linearly in deepness than that is constant.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第6期1871-1876,共6页
Rock and Soil Mechanics
基金
陕西省自然科学基金资助项目(No.SJ08E204)
关键词
非饱和土
统一强度理论
抗剪强度
基质吸力
土压力
unsaturated soils
unified strength theory
shear strength
matric suction
earth pressure
作者简介
张常光，男，1982年生，博士研究生，主要从事地下结构和结构强度理论等方面的研究。E—mail：zcg1016@163．com
