反倾岩质边坡块状-弯曲复合倾倒破坏分析方法研究  

Analytical analysis of block-flexure toppling failure of anti-dip bedding rock slopes

作　　者：张海娜 胡瑞奇 常锦 陈从新[5] 郑允[5] 吴润富 江欣悦 ZHANG Haina;HU Ruiqi;CHANG Jin;CHEN Congxin;ZHENG Yun;WU Runfu;JIANG Xinyue(Jiangxi Key Laboratory of Disaster Prevention-mitigation and Emergency Management,East China Jiaotong University,Nanchang,Jiangxi 330013,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha),Changsha University of Science and Technology,Changsha,Hunan 410114,China;School of Civil Engineering,Changsha University,Changsha,Hunan 410022,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Wuhan,Hubei 430071,China)

机构地区：[1]华东交通大学江西省防灾减灾及应急管理重点实验室,江西南昌330013 [2]华东交通大学土木建筑学院,江西南昌330013 [3]长沙理工大学道路结构与材料交通行业重点实验室(长沙),湖南长沙410114 [4]长沙学院土木工程学院,湖南长沙410022 [5]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩石力学与工程学报》2023年第6期1482-1496,共15页Chinese Journal of Rock Mechanics and Engineering

基　　金：华东交通大学江西省防灾减灾及应急管理重点实验室项目(20212BCD42011);长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目(kfj220302,kfj220301)。

摘　　要：由于岩石的脆性和节理的不规则性,块状–弯曲复合倾倒破坏是反倾岩质边坡最常见的倾倒失稳类型。首先通过离心模型试验揭示块状–弯曲复合倾倒的破坏机制,建立块状–弯曲复合倾倒破坏的力学模型,其次基于极限平衡理论,分别推导出了完整岩层和块状岩层稳定性的力学解析公式,并提出一种块状–弯曲复合倾倒破坏的破坏面搜索算法,最后,通过Matlab编程实现稳定性分析过程。研究结果表明:发生块状–弯曲复合倾倒破坏的边坡可以划分为倾倒区、裂缝区、变形区及无影响区,块状–弯曲复合倾倒破坏的破坏面呈台阶状,且破坏面的台阶高度等于块状岩层内块体高度的倍数;理论分析方法的计算结果与离心试验结果相互吻合;采用理论计算方法进行了影响因素分析,发现缓倾节理倾角及边坡坡角对倾倒Ⅰ区的破坏面范围影响较大,岩层厚度、抗拉强度及缓倾节理倾角对临界失稳高度影响较大。研究成果可为该类边坡的灾害防控提供理论支撑。Due to the brittleness of rock and irregular joint,block-flexure is the most common type of toppling failure in anti-dip bedding rock slopes.Firstly,the failure mechanism of block-flexure toppling was clarified by centrifugal model test.A mechanical analysis model of block-flexure toppling was established.Then,based on the limit equilibrium method,the mechanical analytical formulas for the stability of continuous column and blocky column were derived respectively.The failure surface of block-flexure toppling was searched by the search algorithm.Finally,the whole analysis process was realized by MATLAB programming.The results show that the slope subjected to block-flexure toppling failure can be divided into four subzones(a toppling failure zone,a crack zone,a deformation zone and an unaffected zone).The failure surface of block-flexure toppling is stepped,and the height of these steps is equal to the multiple of the spacing of cross joints.It is found that the results of the theoretical analysis method are mutually verified with the results of centrifugal test.Then,the influencing factors were analyzed by the theoretical method.It is found that the inclination of cross-joint and inclination of slope face have a great influence on the scope of the first toppling failure zone;the thickness of column,tensile strength and the inclination of cross-joint have a great influence on the critical instability height.The research results can provide theoretical support for disaster prevention and control of the slope.

关 键 词：边坡工程 反倾岩质边坡 块状-弯曲复合倾倒破坏 极限平衡理论 分析方法 

分 类 号：P642[天文地球—工程地质学]