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基于双剪统一强度理论,考虑中间主应力和基质吸力等因素的影响,建立了非饱和土库仑被动土压力的统一解。将计算结果与非饱和土朗肯被动土压力统一解的计算结果进行比较,验证了该公式的正确性,并得到了中间主应力、基质吸力和有效内摩擦角等参数对非饱和土库仑被动土压力统一解的影响特性。研究结果表明:非饱和土库仑被动土压力统一解具有广泛的适用性,饱和土库仑被动土压力和非饱和土朗肯被动土压力均为其特例。中间主应力、基质吸力和有效内摩擦角对非饱和土库仑被动土压力的影响十分显著,并且非饱和土库仑被动土压力随双剪统一强度理论参数、基质吸力和有效内摩擦角的增大而增大。
Based on the double shear unified strength theory, considering the influence of intermediate principal stress and matrix suction, the unified solution of Coulomb’s passive earth pressure in unsaturated soil is established. Comparing the calculation results with the calculation results of the solution of Rankun passive earth pressure in unsaturated soil, the correctness of the formula is verified and the effects of such parameters as intermediate principal stress, matrix suction and effective internal friction angle on Coulomb passive Influence Characteristics of Unified Solution of Earth Pressure. The results show that the universal solution of Coulomb’s passive earth pressure in unsaturated soil has a wide range of applicability. The passive earth pressure of saturated soil and the passive earth pressure of unsaturated soil are the special cases. The influence of the middle principal stress, the matrix suction and the effective internal friction angle on the Coulomb’s passive earth pressure in unsaturated soils is very significant, and the Coulomb’s passive earth pressure in unsaturated soils increases with the uniaxial strength theory parameters, the matrix suction and the effective internal friction angle Increase.