顺层岩质边坡的溃屈和倾倒机制研究及工程分析  

Engineering analysis on the mechanisms of buckling and toppling of bedding rock slope

作　　者：幸芊 洪兆远 刘成章 谢新春 刘剑 Xing Qian;Hong Zhaoyuan;Liu Chengzhang;Xie Xinchun;Liu Jian(CMCU Engineering Co.,Ltd.,Chongqing 400039,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中机中联工程有限公司,重庆400039 [2]重庆交通大学土木工程学院,重庆400074

出　　处：《岩土工程技术》2025年第2期207-215,共9页Geotechnical Engineering Technique

基　　金：重庆市高新技术企业科技研发项目(RD2021009);中机中联工程有限公司科研项目(KY202112)。

摘　　要：大量工程实践表明,非滑动破坏的顺层边坡可能存在溃屈和倾倒的变形、破坏机制。为研究两种特殊机制的产生机理和支护方案,通过离散元数值模拟方法和典型工程项目的相关数据分析,结合层状岩体的破坏试验,研究了顺层边坡产生溃屈和倾倒的基本条件及变形、破坏规律。结果表明:对于顺层高边坡,当边坡坡角与岩层层面倾角相同或接近时,在表层层状岩体自重作用下,坡脚可能出现屈服并产生浅表垮塌,进而引发边坡产生溃屈破坏;当边坡坡角小于岩层层面倾角时,边坡可能产生倾倒变形;顺层边坡倾倒变形与后续的破坏模式需分开看待,最终的破坏形式受边坡变形演化的影响,存在动态变化过程。对于存在溃屈和倾倒变形破坏机制的顺层岩质边坡,建议在坡脚设置大刚度支撑结构进行支护。A large number of engineering practices show that the deformation and damage mechanisms of toppling and buck-ling may exist in the non-sliding damaged bedding slopes.To study the generation mechanism and support scheme of two special mechanisms,the basic conditions,deformation,and failure laws of bedding slopes were studied through discrete element numerical simulation method and relevant data analysis of typical engineering projects,combined with failure tests of layered rock masses.The results show that:for high-rise slopes,when the slope angle is the same or close to the dip angle of the rock layer,the foot of the slope may yield and shallow collapse under the self-weight of the surface layered rock mass,leading to the buckling failuare of the slope;when the slope angle is smaller than the dip angle of the rock layer,the slope may undergo toppling deformation;the toppling deforma-tion and subsequent failure modes of layered slopes need to be viewed separately,and the final failure form is influenced by the evolu-tion of slope deformation and undergoes dynamic changes.For layered rock slopes with mechanisms of buckling and toppling deformation,it is recommended to install high-stiffness support structures at the foot of the slope for support.

关 键 词：顺层岩质边坡 溃屈模式 倾倒变形 破坏机理 离散元 

分 类 号：TU457[建筑科学—岩土工程]