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为改善现有非饱和土抗剪强度统一解与地基极限承载力的应用灵活性,分别对二者进行了拓展研究.研究包括非饱和土抗剪强度统一解的适用范围,非饱和土地基极限承载力的模型试验结果验证、线性吸力和高吸力对地基极限承载力的影响.结果表明:拓展后的非饱和土通用抗剪强度统一解可适用于双应力状态变量理论、有效应力理论及其他理论方法;扩展后的地基极限承载力公式得到模型试验结果的验证,且统一强度理论参数为0或1都不能反映试验地基土的真实承载特性;高吸力具有双重影响,线性吸力分布下的地基极限承载力明显小于均布吸力下的地基极限承载力.应实测地基土中基质吸力的大小及其分布,并慎重选择高吸力双曲线模型的截距.
In order to improve the uniaxial shear strength of existing unsaturated soils and the application flexibility of the ultimate bearing capacity of foundation, the expansion of the two is studied respectively.The research includes the applicable range of unified solutions of shear strength of unsaturated soils, the limit of unsaturated soils The results show that the universal solution of universal shear strength for unsaturated soils can be applied to the theories of double stress state variables, effective stress theory and others The theoretical formula of the ultimate bearing capacity of foundation is validated by the model test results. The uniform strength theory parameters of 0 or 1 can not reflect the true bearing capacity of the test foundation soil. The high suction has a dual impact. The foundation under the linear suction distribution The ultimate bearing capacity is obviously smaller than the ultimate bearing capacity of the foundation under uniform suction, the size and distribution of the matrix suction in the foundation soil should be measured, and the intercept of the hyperbolic model with high suction should be chosen carefully.