强震作用下反倾层状岩质边坡变形及破坏模式研究  

Study on the Deformation and Failure Mode of Anti-dip Layered Rock Slope under Earthquake

作　　者：刘汉东[1,2] 耿正 王忠福 牛林峰[1,2] 王四巍 徐峰 LIU Handong;GENG Zheng;WANG Zhongfu;NIU Linfeng;WANG Siwei;XU Feng(Research Institute of Geotechnical Engineering and Hydraulic Structure,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan,China;Henan Key Laboratory of Geotechnical and Structure Engineering,Zhengzhou 450045,Henan,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,Henan,China)

机构地区：[1]华北水利水电大学岩土力学与水工结构研究院,河南郑州450045 [2]河南省岩土力学与结构工程重点实验室,河南郑州450045 [3]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《水力发电》2019年第9期17-21,38,共6页Water Power

基　　金：国家自然科学基金资助项目(U1704243)

摘　　要：以反倾层状岩质边坡为研究对象,通过振动台试验,对强震作用下反倾层状岩质边坡的变形规律和破坏模式进行了研究,并通过数值分析对试验结果进行了验证。结果表明,反倾层状岩质边坡在强震作用下坡体内的位移不断增大,能量不断累积,裂隙不断发育延伸;裂隙从边坡的中下部开始发育,沿结构面不断向边坡内部和上部延伸;裂隙的产生、发育和贯通是反倾层状岩质边坡整体失稳的主要原因。反倾层状岩质边坡在强震作用下主要变形规律为,在震动初期坡体表面部分岩体松动,最终脱离坡体坠落;随着震动的持续,裂隙沿坡体内部结构面逐渐贯通,产生崩塌破坏。Taking the anti-dip layered rock slope as research object,the deformation law and failure mode of anti-dip layered rock slope under earthquake are studied through shaking table test,and the test results are verified by numerical analysis.The research indicates that,(a)the displacement of anti-dip rock slope is increasing under the earthquake,the energy is accumulated continuously and the crack continues to develop and extend;(b)the fissures develop from the middle and lower parts of slope and continue to extend into the interior and upper part of slope along the structural plane;and(c)the generation,development and penetration of fissure is the main reason for the overall instability of anti-dip rock slope.The main deformation laws of anti-dip rock slope under earthquakes are:the rock mass at the surface of slope is loosened in the initial stage of the vibration and finally falls off the slope,and with the continuance of vibration,the crack gradually penetrates along the internal structural surface of slope and then causing collapse.

关 键 词：反倾层状岩质边坡 变形规律 破坏模式 振动台试验 有限差分法 

分 类 号：P642[天文地球—工程地质学]