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基于双剪统一强度理论与非饱和土抗剪强度公式,结合Sarma法的思想,推导考虑中间主应力效应和条间基质吸力的非饱和土斜坡稳定性计算公式,并将其应用于工程实例进行验证。结果表明,非饱和土斜坡稳定性系数与中间主应力参数b和基质吸力成正相关关系,二者均对斜坡的稳定性产生贡献;与传统方法相比,在基质吸力等于50kPa时,同时考虑中间主应力效应和条间基质吸力方法的稳定性计算结果增大27.6%,能够更加经济、合理地评价非饱和土斜坡稳定性。
Based on the double shear unified strength theory and the unsaturated soil shear strength formula, combined with the Sarma method, the formula for calculating the slope stability of unsaturated soils considering the intermediate principal stress effect and the inter-strip matric suction is derived and applied to engineering practice verification. The results show that the slope stability coefficient of unsaturated soil has a positive correlation with the intermediate principal stress parameter b and the matrix suction, both of which contribute to the stability of the slope. Compared with the traditional method, when the substrate suction is equal to 50 kPa, The calculation results of the main stress effect and the stability of the strip suction method are increased by 27.6%, which can evaluate the slope stability of unsaturated soil more economically and reasonably.