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Mohr-Coulomb理论应用于土体分析时的两大缺陷,即未考虑中主应力的影响,也未考虑土体材料的SD效应,因而对于土体材料的潜能未充分考虑。为了考虑上述两种效应,本文基于广义非线性强度准则(GNST)及平面强度理论,推导出了可应用于砂土及粘土类材料的平面应变破坏条件。将上述推导结果应用于地基承载力的计算,推导出了基于GNST准则的地基承载力计算公式。通过与实际载荷试验数据比较,本文计算结果与实验数据吻合较好。表明推导出来的α公式对于计算砂土的强度特性是可行的,同时也可应用于其他平面应变问题有同样的参考意义。
The two main shortcomings of Mohr-Coulomb theory applied in soil analysis are that it does not consider the influence of middle principal stress and does not consider the SD effect of soil material, so the potential of soil material is not fully considered. In order to consider the above two effects, based on the generalized nonlinear strength criterion (GNST) and the plane strength theory, the plane strain failure conditions applicable to sand and clay materials are deduced. Applying the above deduction to the calculation of the bearing capacity of foundation, the formula of calculating the bearing capacity of foundation is deduced based on GNST criterion. Compared with the actual load test data, the calculated results are in good agreement with the experimental data. It is shown that the α formula deduced is feasible for calculating the strength characteristics of sand and is also applicable to other plane strain problems with the same reference meaning.