基于非线性破坏准则的临坡地基承载力上限分析

发布时间：2018-10-10 17:25

【摘要】：临坡地基承载能力的确定分析已成为地基设计理论中一个重要研究课题。针对现有地基承载力分析方法大多基于线性Mohr-Coulomb破坏准则。考虑岩土材料破坏的非线性特性,采用非线性破坏准则和多切线法,引入极限分析上限理论,根据临坡条形基础地基破坏模式的非对称性特点,构建出临坡条形基础地基单侧刚性多滑块破坏模型及相应运动允许速度场。在此基础上,利用序列二次规划非线性优化算法,建立临坡条形基础地基极限承载力的确定方法。最后,通过工程实例计算,并与已有研究方法计算结果进行对比分析。结果表明,非线性参数对临坡地基承载力有着重要影响,采用多切线法处理非线性材料强度准则问题理论上更严密,上限解更优,验证了该方法的可行性与合理性。
[Abstract]:The determination and analysis of bearing capacity of adjacent slope foundation has become an important research topic in foundation design theory. Most of the existing analysis methods of foundation bearing capacity are based on linear Mohr-Coulomb failure criterion. Considering the nonlinear characteristics of rock and soil material failure, the nonlinear failure criterion and multi-tangent method are adopted, and the upper limit theory of limit analysis is introduced. The failure model of single side rigid multi-slider and the allowable velocity field of the corresponding motion are constructed. On this basis, the method of determining the ultimate bearing capacity of strip foundation is established by using the nonlinear optimization algorithm of sequential quadratic programming. Finally, through the engineering example calculation, and carries on the contrast analysis with the existing research method computation result. The results show that the nonlinear parameters have an important influence on the bearing capacity of the subgrade near the slope. The multi-tangent method is used to deal with the nonlinear material strength criterion problem theoretically more strictly and the upper limit solution is better. The feasibility and rationality of the method are verified.
【作者单位】：湖南大学岩土工程研究所;湖南理工学院土木建筑工程学院;
【基金】：国家自然科学基金项目(No.51378198) 高等学校博士学科点专项科研基金项目(No.20130161110017)~~
【分类号】：TU47

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