Influence of joint spacing and rock characteristics on the toppling stability of cut rock slope through a simplified limit equilibrium method  

应用简化极限平衡法研究节理间距和岩体特性对挖方岩质边坡倾倒稳定性的影响

作　　者：ZHANG Xue-peng JIANG Yu-jing DU Yan WANG Ke-peng CAI Yue WANG Xing-da SU Hang GOLSANAMI Naser LIU Bao-guo 张学朋;蒋宇静;杜岩;王克鹏;蔡跃;王兴达;苏航;GOLSANAMI Naser;刘保国(State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;School of Engineering,Nagasaki University,1-14 Bunkyo-machi,8528521 Nagasaki,Japan;Beijing Key Laboratory of Urban Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China;The 4th Engineering Company,China Railway No.3 Engineering Group Co.Ltd.,Beijing 102300;Fukumichi Limited Liability Company,Fukuoka 813-0041,Japan;College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China [2]College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China [3]School of Engineering,Nagasaki University,1-14 Bunkyo-machi,8528521 Nagasaki,Japan [4]Beijing Key Laboratory of Urban Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China [5]The 4th Engineering Company,China Railway No.3 Engineering Group Co.Ltd.,Beijing 102300 [6]Fukumichi Limited Liability Company,Fukuoka 813-0041,Japan [7]College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,China [8]School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Journal of Central South University》2024年第8期2694-2702,共9页中南大学学报（英文版）

基　　金：Project(52109132)supported by the National Natural Science Foundation of China;Project(ZR2020QE270)supported by the Natural Science Foundation of Shandong Province,China;Project(JMDPC202204)supported by State Key Laboratory of Strata Intelligent Control,Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology;Shandong University of Science and Technology,China。

摘　　要：Toppling failure of rock mass/soil slope is an important geological and environmental problem.Clarifying its failure mechanism under different conditions has great significance in engineering.The toppling failure of a cutting slope occurred in a hydropower station in Kyushu,Japan illustrates that the joint characteristic played a significant role in the occurrence of rock slope tipping failure.Thus,in order to consider the mechanical properties of jointed rock mass and the influence of geometric conditions,a simplified analytical approach based on the limit equilibrium method for modeling the flexural toppling of cut rock slopes is proposed to consider the influence of the mechanical properties and geometry condition of jointed rock mass.The theoretical solution is compared with the numerical solution taking Kyushu Hydropower Station in Japan as one case,and it is found that the theoretical solution obtained by the simplified analysis method is consistent with the numerical analytical solution,thus verifying the accuracy of the simplified method.Meanwhile,the Goodman-Bray approach conventionally used in engineering practice is improved according to the analytical results.The results show that the allowable slope angle may be obtained by the improved Goodman-Bray approach considering the joint spacing,the joint frictional angle and the tensile strength of rock mass together.岩体/土质边坡的崩塌是重要的地质和环境问题,分析其在不同条件下的破坏机理具有重要意义。本文以日本九州某水电站发生的挖方边坡倾倒为工程背景,在现场调查时发现,在发生岩石边坡倾倒破坏时节理起到不可忽视的作用,因此为了考虑节理岩体的力学性能和几何条件的影响,提出了一种基于极限平衡法的改进简化分析方法,用于探究挖方岩质边坡的挠曲倾覆。以日本九州水电站为案例,将理论解与数值解进行比较发现,简化分析方法得到的理论解与数值解析解一致,从而验证了简化方法的准确性。同时,根据分析结果对工程实践中常用的Goodman-Bray方法进行改进。结果表明,采用改进的Goodman-Bray方法可以综合考虑节理间距、节理摩擦角和岩体抗拉强度,求得更为准确的边坡的允许倾角。

关 键 词：slope stability flexural toppling rock slope simplified limit equilibrium method 

分 类 号：TU45[建筑科学—岩土工程]