地震作用下结构面劣化特征及高位危岩体动力失稳机制  

Deterioration Characteristics of Structural Plane and Dynamic Instability Mechanism of High Dangerous Rock Mass under Earthquake

作　　者：高丙丽[1] 张金厚 张路青[2] Gao Bingli;Zhang Jinhou;Zhang Luqing(College of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京100029

出　　处：《地球科学》2022年第12期4417-4427,共11页Earth Science

基　　金：国家重点研发项目(No.2019YFC1509703);陕西省重点研发计划(No.2021ZDLGY07⁃08).

摘　　要：地震是高位危岩体失稳崩塌主要诱因之一,而结构面强度与变形特性对高位危岩体稳定性起关键控制性作用.为研究地震作用下高位危岩体动力失稳机制,基于数值试验研究结构面震动劣化效应,并利用极限平衡法对高位危岩体动力稳定性进行研究.研究结果表明,结构面的峰值抗剪强度随着循环剪切次数的增加而减小,且减小幅度愈来愈小,最终趋于稳定值;随着起伏角度增大而增大,且增大幅度随着循环剪切次数的增加而减小;并在同一起伏角度下,随着循环剪切幅值的增大而减小.最后,基于回归分析法建立结构面震动劣化数学模型,并提出一种考虑结构面震动劣化的高位危岩体动力稳定性分析方法.其研究成果有助于丰富高位危岩体动力稳定性方面的基础理论研究,具有重要的理论意义和工程参考价值.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 engineering reference value.

关 键 词：地震 结构面劣化 高位危岩体 动力稳定性 岩土工程 

分 类 号：P642[天文地球—工程地质学]