塑性应变能判据在含组合软弱结构面岩质边坡动力稳定分析中的应用

由于地质构造作用，一处岩质边坡往往在几个软弱结构面的共同作用下发生失稳，其破坏形式与单一软弱结构面的破坏形式有较大差异，尤其是在地震的往复作用下，其稳定性分析十分复杂，需要合适的判据对其稳定状态进行判别。鉴于塑性应变能具有客观性强，能真实反映岩土体稳定性的特点，本文基于有限元软件ABAQUS 使用强度折减法建立某一实际水利工程含组合软弱结构面岩质边坡震后塑性应变能与折减系数的关系曲线，以震后塑性应变能突变为失稳判别准则对边坡在地震作用下的稳定性进行了分析，并将计算结果与常用特征点位移突变、塑性区贯通判据结果进行对比。结果表明：塑性应变能突变判据与特征点位移突变、塑性区贯通判据得到的结果相近，准确性有保证，且不受观测点选取等主观因素影响，得到的结果唯一，是在分析含组合软弱结构面岩质边坡动力稳定性时的较优选择。

Application of plastic strain energy criterion to dynamic stability analysis of facial rock slope with composite weak structure

Due to the action of tectonics,a rock slope often loses stability under the joint action of several weak structural planes.Its failure form is quite different from that of a single weak structural plane.Especially under the reciprocating action of earthquakes,its stability analysis is very complex, and it needs appropriate criteria to judge its stability state. In view of the strong objectivity of plastic strain energy,which can truly reflect the stability of rock and soil mass,this paper analyzes the stability of slope under earthquake action by establishing the relation curve between plastic strain energy and reduction coefficient of rock slope with structural plane of composite weak structural plane in a practical hydraulic project after the earthquake, taking the sudden change of plastic strain energy after the earthquake as the criterion of instability. Then we compare the calculation results with the results of the displacement mutation and the plastic zone penetration criteria. The results show that the sudden change criterion of plastic strain energy is close to the results obtained by the sudden change criterion of displacement of characteristic points and the breakthrough criterion of plastic zone.The accuracy is guaranteed,which is not affected by subjective factors such as the selection of observation points. The results obtained are unique,providing a better choice for the analysis of dynamic stability of rock slopes with combined weak structural planes.