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按平面应变问题建立有限元数值模型,通过比较有限元解与极限平衡解,检验该数值模拟的计算精度。基于数值模拟计算结果,分析了地基土强度、边坡角、坡顶距、基底接触条件等因素对临坡地基极限承载力的影响。针对纯黏土,提出临界强度、过渡点的概念,建立了临坡地基土体强度与地基破坏模式的定量对应关系。得出边坡角越小,地基土内摩擦角对于临坡地基极限承载力的影响越明显;边坡角越大,临坡地基极限承载力随坡顶距的增长速度越快;纯黏土的qu/(γB)-c/(γB)曲线由曲线段及直线段构成,分别对应地基整体失稳和局部失稳破坏。
According to the problem of plane strain, a finite element numerical model is established, and the calculation accuracy of the numerical simulation is verified by comparing the finite element solution with the limit equilibrium solution. Based on the results of numerical simulation, the influences of the strength of foundation soil, slope angle, pitch and top contact conditions on the ultimate bearing capacity of the subgrade are analyzed. For the pure clay, the concept of critical strength and transition point is proposed, and the quantitative relationship between the strength of soil on the slope foundation and the failure mode of foundation is established. The results show that the smaller the slope angle, the more obvious the influence of the friction angle of foundation soil on the ultimate bearing capacity of the slope foundation. The larger the slope angle is, the faster the ultimate bearing capacity of the slope foundation grows with the top of the slope. The curve of qu / (γB) -c / (γB) consists of curved sections and straight sections, corresponding to the overall instability and local instability of the foundation.