【摘要】 阿比尔的等提出了极限应变判据及其稳定分析方法,采用数值极限分析方法求出岩土材料在单向受力下的极限应变,以极限应变作为岩土材料的破坏标准,结合强度折减法计算岩土工程破坏的起裂、演化过程和稳定安全系数。文章介绍了极限应变的概念和计算方法,采用数值极限分析方法中的有限元荷载增量法求得了不同参数土体材料的极限应变。采用灰关联法,分析与土体相关8个影响因子对极限应变的敏感性,由大到小分别为:弹性模量、黏聚力、网格数、内摩擦角、泊松比、模型尺寸、土体重度、抗拉强度。更多还原

【Abstract】 Abi Erdi and others put forward ultimate strain criterion and stability analysis method based on it.The numerical limit analysis method is applied to solve the ultimate strain of geomaterials;the ultimate strain under uniaxial pressure was got as a new failure criterion to judge the failure of materials and to solve geotechnical failure surface position,shape,evolution process and the stability safety factor through strength reduction method.In this paper,the concept and calculation method of ultimate strain are introduced.The finite element load increment method in numerical limit analysis method is used to obtain the ultimate strain of soil material of different parameters.It’s the sensitivity of the eight factors which influence ultimate strain that is analyzed by means of gray relational analysis method,according to the size in the order:elastic modulus,cohesion,grid number,internal friction angle,Poisson’s ratio,model size,unit weight of soil and tensile strength.更多还原