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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,推导了平面应变条件下非饱和土双应力状态变量抗剪强度统一解,进而考虑中间主应力、特别是基质吸力高低的不同影响,建立了非饱和土主动、被动土压力和任意侧压力系数下均适用的条形地基临界荷载解析解。本文解析解具有广泛的理论意义,根据实际工程具体情况,可进行多种选择。研究结果表明:在低基质吸力范围内,非饱和土被动土压力和条形地基临界荷载随着统一强度理论参数和基质吸力的增大而不断增加,主动土压力则相反;在高基质吸力范围内,被动土压力和临界荷载均逐渐减小并趋于稳定;超固结比对条形地基临界荷载的影响较小。
Based on the unified strength theory and the shear strength of the bi-stress state variables of unsaturated soils, taking into account the effect of intermediate principal stress reasonably, the unified solution to the shear strength of unsaturated soil under biaxial stress is deduced, and then the intermediate principal stress The influence of the matrix suction on the stability of the strip foundation, the analytical solutions of the critical load for the strip foundation under active and passive earth pressure and arbitrary lateral pressure coefficient of unsaturated soil are established. The analytical solution of this paper has a wide range of theoretical significance, according to the actual situation of the project, can make a variety of choices. The results show that the passive earth pressure and the critical load of the strip foundation increase with the increasing of the unified strength theory parameters and the matrix suction under the low matrix suction range, and the active earth pressure is opposite. Under the high substrate suction range The passive earth pressure and the critical load both decrease gradually and tend to be stable. The effect of over consolidation ratio on the critical load of strip foundation is smaller.