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RIGOROUS SOLUTION METHOD FOR BEARING CAPACITY CONSIDERING SHEAR STRENGTH OF SOIL ON SIDES OF FOUNDATION
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摘要: 根据双向破坏地基的失稳特征,构建地基极限状态时土体中不连续应力场和速度场,通过分析不连续应力场和速度场的特点;基于上、下限原理,建立计算模型,构建求解地基极限承载力的算法。通过解三类边值问题,求得考虑超载土体抗剪强度时地基极限承载力的精确数值解,同时验证平面光滑地基的滑移线应力解是精确解。上述解满足基底土体表面速度边界和其他已知的边界条件。算例表明:求解考虑超载土体抗剪强度时地基极限平衡问题近似真解的算法是可行的,结论可靠。Abstract: Based on the characteristics of ground symmetrical failure,the discontinuous stress field and velocity field of the soil mass are constructed.The character of discontinuous line of stress and velocity,the stress field are analyzed.By upper and lower bound theorems,the model of calculation and the method for bearing capacity are got.The stress field and the corresponding mobile field are got by the numerical calculation to solve three kinds of boundary value problems.The stress field satisfied with all velocity boundary is found.The rigorous solution of bearing capacity considering shear strength of soil on sides of foundation is obtained.The computation results show that the approach to solve the limit equilibrium problem is available.
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