屈服准则与重力坝超载安全系数的相关分析

有限元法的计算精度与可靠性和屈服准则的适当选择直接相关。因此，在坝体稳定性数值分析中，屈服准则的选择对重力坝超载安全系数影响较大。为了研究屈服准则与重力坝超载安全系数的本质关系，进而给数值计算中屈服准则适当选择提供理论依据，运用应力解法推导了屈服准则随着罗代角的变化与重力坝超载安全系数之间的函数关系，并运用有限元法对向家坝水利工程大坝深层抗滑稳定性进行验证与研究。研究表明内切圆锥屈服准则使得超载安全系数取得极小值，坝体最容易发生塑性流动失稳，而扩展锥屈服准则下的超载安全系数最大，坝体不容易发生塑性流动失稳

Correlation Analysis Between Druker_Prager Yield Criteria and Overload Safety Factor of Gravity Dam

Accuracy and reliability of FEM are influenced by yielding criterion,so it is very important to choose one proper yield criterion for stability analysis when using overload numerical method.In order to investigate the essential relationship between Druker_Prager yield criterion and overload safety factor of gravity dam and further afford theoretical warrant for numerical computation,explicit expression for the relationship between the Druker_Prager yield criteria and the overload safety factor of an ideal gravity dam is established by using stress solution,and the gravity dam's stability of Xiangjiaba hydro-power project has been investigated by using FEM.Both indicate that the overload factor reaches its minimum when the inscribed cone yield criterion is used,and reaches its maximum when the expansive cone yield criterion is used.