地震作用下结构面劣化特征及高位危岩体动力失稳机制
摘要
Earthquake is one of the main causes of instability and collapse of high dangerous rock mass, and the strength and deformation characteristics of structural plane play a key role in controlling the stability of high dangerous rock mass.In order to study the dynamic instability mechanism of high dangerous rock mass under earthquake, in this paper it studies the vibration deterioration effect of structural plane based on numerical tests and studies the dynamic stability of high dangerous rock mass based on the limit equilibrium method.The research results show that the peak shear strength of the structural plane decreases with the increase of cyclic shear times, and the decreasing degree is getting smaller and smaller until it finally tends to be stable.It increases as the undulation angle increases, and the increase amplitude decreases as the cyclic shear times increase; and it decreases as the cyclic shearing amplitude increases at the same undulation angle.Finally, the mathematical model of structural plane vibration degradation is established based on regression analysis method, and a dynamic stability analysis method of high dangerous rock mass considering structural plane vibration degradation is proposed.The research results are helpful to enrich the basic theoretical research on the dynamic stability of high dangerous rock mass, which is of great theoretical significance and 基金项目： 国家重点研发项目(No.2019YFC1509703);陕西省重点研发计划(No.2021ZDLGY07•08).