【摘要】 为探讨边坡稳定分析时得到精确上限解的方法,以无重边坡极限承载力问题为例,依据滑移线场确定破坏机构,推出一个上限解公式,并采用算例与能量法和有限元方法进行比较。分析结果表明:依据滑移线场确定破坏机构所得到的上限解公式与经典滑移线法承裁力公式相同;依据滑移线场确定破坏机构得到的上限解的结果略小于能量法和有限元方法的结论,属于3个上限法中的最小上限解;且能量法和有限元方法最终搜索出的滑面也和滑移线吻合。可见依据滑移线场确定破坏机构的上限法正确、可行、简单、有效,说明以滑移线作为破坏机构的分块模式合理,可得到较精确上限解。更多还原

【Abstract】 Although adopting the plasticity limit analysis upper bound method shows many advantages in slope stability analysis,the error between critical slip face and actual slide surface is different when the divided pattern of failure mechanism is different.In order to discussion the method of acquiring the more accurate upper-bound solution of homogeneous soil slope,the upper-bound formula of c-φ weightless soil slope is deduced when the slip line field is adopted as the divided pattern of failure mechanism,and the calculation result is compared with energy method and finite element upper-bound method reported in other literatures.According to contrast,the upper-bound formula is equal to the classical slip-line field solution,and the calculation result is slightly less than the results of energy method and finite element upper-bound method.Furthermore,the critical slide faces of energy method and finite element method fit together with slip line field.So all the analysis results prove that the limit analysis upper bound method adopting in slip line field as the divided pattern of failure mechanism is rational and can acquire the more accurate upper-bound solution,and the calculation solution of the method is correct and credible.更多还原