地震作用下双面岩质斜坡的动力响应规律及失稳机制研究

Double-sided rock slopes tend to trigger intense response and severe damage under earthquake, thus it is of great significance to study the seismic response law and instability mechanism for disaster prevention and mitigation. This project intends to adopt geological survey, theoretical analysis and numerical simulation to carry out research. By adopting geological survey generalize the deformation failure modes of the double-sided rock slopes under earthquake. Using shear beam method, to study the response regularity of homogeneous double-sided slopes under vertical incidence SV wave; Based on ray theory, determining the differences between single-sided and double-sided slope under the dynamic action. By employing discrete element method, to explore topography effects, geological effects and coupled effects from the perspective of time domain and frequency domain. Through performing parametric analyses, to consider the effect of slope height, slope angle and other factor; discussing the relationship between dynamic response of the deformation and failure characteristics.Therefore, based on the above work, typical examples of the Wenchuan earthquake are selected for conducting validation studies and the instability mechanism of double-sided rock slopes under earthquake is concluded.

地震作用下，双面岩质斜坡往往产生强烈响应和严重破坏，研究其动力响应规律与失稳机制对于防灾减灾具有重要意义。本项目拟采取地质调查、理论分析与数值模拟相结合的方法开展研究工作。通过地质调查，概化出地震作用下双面岩质斜坡的变形破坏模式。运用剪切梁方法，研究均质双面坡在垂直入射SV波作用下的响应规律；根据射线理论，对地震作用下单面坡与双面坡的响应规律作对比研究。采用离散元方法，从时域和频域角度研究地形效应、地质效应及二者的耦合效应；开展系统的参数分析，研究坡高、坡度等参数对响应的影响；研究动力响应规律与变形破坏特征的关系。基于上述工作，选取汶川地震等中的典型实例开展实例研究，得出地震作用下双面岩质斜坡的失稳机制。

本项目采取地质调查、理论分析与数值模拟相结合的方法开展了系统研究工作。通过地质调查，概化出了地震作用下双面岩质斜坡的变形破坏模式。根据射线理论，研究均质双面坡在垂直入射P波作用下的响应规律，对地震作用下单面坡与双面坡的响应规律作对比研究。采用离散元方法，从时域和频域角度研究地形效应、地质效应及二者的耦合效应；开展系统的参数分析，研究坡高、坡度等参数对响应的影响；研究动力响应规律与变形破坏特征的关系。基于上述工作，选取典型实例开展了实例研究，并得出地震作用下双面岩质斜坡的失稳机制。