塑性应变能判据在边坡动力稳定分析中的应用

Application of Plastic Strain Energy Criterion in Slope Dynamic Stability Analysis

目前常用边坡失稳判据主观性较大,而塑性应变能具有数值单一、概念明确、能真实反映结构稳定性的特点。基于有限元软件ABAQUS,以我国某大型水利工程右岸边坡为研究对象,以震后边坡整体塑性应变能突变为失稳判别标准,确定边坡安全系数,并将所得结果与塑性区贯通判据和位移突变判据的结果进行对比。结果表明,基于塑性应变能判据得到边坡在0.2 g地震动作用下的安全系数为1.85,与塑性区贯通和位移突变判据得到的结果接近,该判据在动力工况下的准确性有一定保证。

In view of the fact that the current commonly used slope instability criterion is subjective,and the plastic strain energy has the characteristics of single value and clear concept,which can truly reflect the structural stability.In this paper,based on the finite element software ABAQUS,the right bank slope of a large-scale water conservancy project in China is taken as the research object,and the overall plastic strain energy of the post-earthquake slope is changed to the instability criterion to determine the safety factor of the slope,and the obtained result is connected with the plastic zone penetration criterion compare with the results of displacement mutation criterion.The results show that the safety factor of the slope based on the plastic strain energy criterion under 0.2 g ground motion is 1.85,which is close to the results obtained by the plastic zone penetration and displacement mutation criterion.The criterion is accurate under dynamic conditions.