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地震力作为一种动态载荷,其作用是导致顺层结构面黏聚力及抗拉强度的丧失。由此,提出了一种动力分析法(数值分析法)与极限平衡法(公式法)相结合的顺层岩质边坡地震稳定性评价方法。该方法利用基于连续介质力学的离散元方法(CDEM)获取震后结构面处的残余强度,将残余强度代人极限平衡公式求解重力作用下的安全系数,并将此安全系数作为评价顺层岩质边坡地震稳定性的指标。分析结果表明,传统拟静力法用于顺层岩质边坡地震稳定性的评价是不适宜的,通过本文方法获得的顺层边坡动力安全系数具有明显的3阶段特征(水平段-速降段-水平段),而拟静力法获得的安全系数随着设防烈度的增大却呈现出逐渐减小的特征。此外,所述方法还可体现地震波频率对顺层岩质边坡稳定性的影响。
Earthquake force as a dynamic load, its role is to cause the cohesion and tensile strength of the layer structure of the loss. Therefore, a seismic stability evaluation method of bedding rock slope is put forward by combining dynamic analysis (numerical analysis method) with limit equilibrium method (formula method). The method uses the discrete element method (CDEM) based on continuum mechanics to obtain the residual strength at the structural plane after the earthquake. The residual strength is calculated by the limit equilibrium formula to solve the safety factor under gravity. The safety factor is used as the evaluation of bedding rock Index of seismic stability of slope. The results show that it is unsuitable for the traditional quasi-static method to evaluate the seismic stability of the bedding rock slope. The dynamic safety factor of the bedding slope obtained by this method has obvious 3-stage characteristics (horizontal section-speed Descending section - horizontal section), while the safety factor obtained by quasi-static method shows a decreasing characteristic with the increase of fortification intensity. In addition, the method can also reflect the impact of seismic wave frequency on the stability of the bedding rock slope.