利用抗剪强度计算地基承载力特征值方法探讨

Discussion on Calculation Method of Characteristic Value of Foundation Bearing Capacity by Shear Strength

利用不同地层情况的计算实例,分别采用抗剪强度指标厚度加权平均法和附加应力面积法对地基承载力特征值进行计算,对计算结果进行分析,对不同的计算方法的理论原理进行了剖析,提出利用附加应力系数法计算抗剪强度指标标准值的结论。同时提出抗剪强度指标应采用不固结不排水剪指标,当持力层为粉土时应对其抗剪强度指标进行75%的折减的方法和建议。为合理利用抗剪强度指标计算地基承载力特征值提供了有益的参考。

Based on the calculation cases for different formation situations,characteristic value of foundation bearing capacity was calculated by shear strength index thickness weighted average method and additional stress area method.Analysis was made on calculation results,conclusion was drawn that shear strength index should be calculated by additional stress coefficient method.Shear strength index should use non consolidated and non drainage shear ones,when the bearing stratum is of silt,shear strength index should be reduced to 75%.