顺层非贯通节理边坡稳定性及破坏模式研究  

Study on Failure Mode and Stability of Slope Based on Intermittent Joints

作　　者：冯开帅 姜谙男[1] 吴洪涛 焦明伟 段龙梅 FENG Kaishuai;JIANG Annan;WU Hongtao;JIAO Mingwei;DUAN Longmei(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian,Liaoning 116026,China;Jilin Province Traffic Planning and Design Institute,Changchun,Jilin 130000,China)

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [2]吉林省交通规划设计院,吉林长春130000

出　　处：《公路工程》2020年第6期52-58,共7页Highway Engineering

基　　金：国家自然科学基金项目(51678101);中央高校基本科研业务费专项资金项目(3132014326);吉林省交通运输项目(2017ZDGC-4)。

摘　　要：为了探究非贯通节理边坡中节理因素对边坡稳定性的影响,以吉林某岩质边坡为工程背景,运用PHASE有限元软件建立基于Parallel statistical节理网络模型的顺层岩质边坡模型,利用正交分析法对顺层边坡非贯通节理中的节理倾角、节理长度、节理间距和节理岩桥比例等4个因素进行敏感性分析。根据工程实际,对40°时的贯通节理和非贯通节理的破坏模式进行对比研究。研究表明:影响顺层非贯通节理边坡稳定性因素重要性的排序依次是节理倾角、节理长度、岩桥比例和节理间距;在相同条件下,非贯通节理和贯通节理破坏模式不同,非贯通节理在节理两端易产生应力集中,节理之间相互贯通,并向坡体上部发展,最终导致边坡发生沿节理面破坏。而贯通节理破坏先由坡脚产生,而后沿节理面直线上升到坡顶发生破坏,破坏面较为明显。研究结果为节理岩体边坡工程的研究提供了一定的理论依据和参考价值。The purpose of this paper is to explore the influence of joint factors on the stability of slopes in intermittent joints slopes.In order to achieve this goal,taking a rock slope in Jilin as the engineering background,PHASE finite element software was used to establish a bedding rock slope model based on parallel statistical joint network model.The orthogonal analysis method was used to analyze the sensitivity of the four factors of joint dip,joint length,joint spacing and joint rock bridge ratio in the intermittent joints of bedding slope.According to the actual project,a comparative study was conducted on the failure modes of the persistent joints and the intermittent joints at 40°.The research shows that the order of importance of the factors affecting the stability of bedding intermittent joints slope is the order of joint inclination,joint length,rock bridge ratio and joint spacing.Under the same conditions,the intermittent joints and the persistent joints failure modes are different.The intermittent joints tend to generate stress concentration at both ends of the joints,and the joints penetrate each other and develop toward the upper part of the slope,eventually causing the slope to break along the joint surface.The persistent joints failure is firstly generated by the slope foot,and the joint edge along the joint surface rises to the top of the slope to destroy,and the failure surface is more obvious.The research results provide a theoretical basis and reference value for the study of jointed rock slope engineering.

关 键 词：非贯通节理 非贯通节理模型 强度折减 正交试验 破坏模式 稳定性分析 Parallel statistical模型 Goodman单元 

分 类 号：U416.14[交通运输工程—道路与铁道工程]