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基于非饱和土双应力状态变量抗剪强度统一解,合理考虑中间主应力效应,建立了非饱和土库仑主动土压力统一解,并对其进行可比性分析,将其计算结果与非饱和土朗肯主动土压力统一解进行对比,得出各因素的影响特性。研究结果表明,中间主应力和基质吸力对库仑主动土压力的影响显著,随统一强度理论参数和基质吸力的增加,库仑主动土压力不断减小直至为0,证明了考虑中间主应力可以充分发挥材料的自承载能力和强度潜能,具有可观的经济效益;库仑主动土压力随墙背倾角与填土倾角的增大而增大,随有效内摩擦角和基质吸力角的增大而减小,外摩擦角的影响不显著。非饱和土库仑主动土压力统一解具有更广泛的适用性,朗肯主动土压力统一解为其特例,其结果对边坡、基坑等工程的土压力确定和支挡结构设计有很好的借鉴作用。
Based on the unified solution of the shear strength for the bi-stress state variables of unsaturated soils and considering the effect of intermediate principal stress reasonably, a unified solution to the coulomb active earth pressure for unsaturated soils is established, and its comparability is analyzed. Ken active earth pressure unified solution for comparison, draw the impact of various factors. The results show that the influence of intermediate principal stress and matrix suction on Coulomb active earth pressure is significant. With the increase of theoretical parameters of uniform strength and matrix suction, the active earth pressure of Coulomb decreases continuously until it reaches zero, which proves that taking into account the intermediate principal stress can give full play to Material self-bearing capacity and strength potential, with considerable economic benefits; Coulomb active earth pressure with wall dorsal angle and filling inclination increases, with the effective internal friction angle and matrix suction angle decreases, The influence of external friction angle is not significant. Unsaturated soil Coulomb active earth pressure unified solution has a wider range of applicability, Rankine active earth pressure unified solution as its special case, the results of the slope, foundation pit and other projects to determine the soil pressure and retaining structure design is very good Learn from.