基于极限平衡理论的临坡地基承载力计算  

Calculation Method of Bearing Capacity of Adjacent Slope Foundation Based on Limit Equilibrium Theory

作　　者：邹文龙 李星 张惠超 ZOU Wenlong;LI Xing;ZHANG Huichao(China Railway Science Research Institute Co.Ltd.,CREC,Chengdu 610032,China)

机构地区：[1]中铁科学研究院有限公司,成都610032

出　　处：《铁道建筑》2021年第6期89-93,共5页Railway Engineering

基　　金：国家重点研发计划(2017YFC1501000)。

摘　　要：以实践中广泛应用的极限平衡理论为基础,通过静力平衡方程建立了临坡地基极限承载力与临坡地基破坏模式中各几何参数的关系,借助非线性规划算法给出了临坡地基承载力的计算方法,并利用多个既有算例的数据进行对比验证。结果表明:本文方法与既有数值模拟结果吻合较好,所求得的破坏模式符合实际,这表明本文方法具有一定的合理性以及较广泛的适用性。边坡对地基承载力削弱效果消失的临界距离与多种因素有关,而现行规范的规定可能使设计偏于危险,本文方法可以为防治相关地质灾害和岩土工程设计提供依据。Based on the limit equilibrium theory which is widely used in practice,the relationship between the ultimate bearing capacity of the adjacent slope foundation and the geometric parameters in the failure mode of the adjacent slope foundation was established through the static equilibrium equation.The calculation method of the bearing capacity of the adjacent slope foundation was given by means of the nonlinear programming algorithm,and the data of several existing examples were used for comparison and verification.The results show that the proposed method is in good agreement with the existing numerical simulation results,and the failure mode obtained is in accordance with the actual situation,which indicates that the proposed method has a certain rationality and wide applicability.Through the discussion of the critical distance,it is found that the critical distance of the disappearance of the weakening effect of slope on the foundation bearing capacity is related to many factors,and the provisions of the current code may cause the design more dangerous.The method presented in this paper can provide a basis for the prevention and control of related geological disasters and geotechnical engineering design.

关 键 词：临坡地基 承载力 计算方法 极限平衡 非线性规划 临界距离 

分 类 号：TU457[建筑科学—岩土工程]