地震荷载作用下倾倒式危岩体动力失稳机理研究  

Dynamic Stability Analysis of Toppling Unstable Rock under Seismic Loading

作　　者：薛新华[1] 樊旭[1] 郭志元[1] 刘恩龙[1] 张世殊[2] XUE Xinhua FAN Xu GUO Zhiyuan LIU Enlong ZHANG Shishu(College of Water Resources and Hydropower, Sichuan University, Chengdu, China,610065 Chengdu Engi- neering Corporation Limited, Power China, Chengdu, China, 610072)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《沈阳建筑大学学报（自然科学版）》2017年第2期259-265,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51009103)

摘　　要：目的研究地震作用下倾倒式危岩体的动力响应规律及稳定性.方法以金沙江下游溪洛渡水电站14岩流层内1#危岩体为例,利用离散单元法对倾倒式危岩体进行全时程动力分析.结果倾倒式危岩体在地震荷载作用下发生破坏后,落石的主要运动可分为三个阶段,即启动准备阶段、倾倒、翻滚阶段和减速滞留阶段.结论揭示了地震荷载作用下危岩体的失稳规律,为危岩防灾减灾提供了理论依据,可以为类似工程提供参考和借鉴.This paper focuses on the dynamic response and stability of toppling unstable rock under the action of earthquake.Taking the 1# perilous rock within 14 rock flow layer of Xiluodu hydropower station as example,the full range of dynamic analysis of toppling unstable rock is analyzed by means of discrete element method.The results show that the toppling unstable rock mass can be classified as three phases after seismic loading,that is preparation for starting,toppling,rolling as well as deceleration and stasis phases.The above collapse regularity of dangerous rock mass under earthquake load can provide theoretical basis for prevention and reduction of natural disasters,and also provide reference for similar engineering.

关 键 词：离散单元法 倾倒式 危岩体 地震荷载 失稳 

分 类 号：TU45[建筑科学—岩土工程]