变质岩类顺层边坡破裂迹象及边坡开挖失稳范围研究  

Study on the Fracture Signs of Metamorphic Rock Bedding Slope and the Range of Slope Excavation Instability

作　　者：刘健 LIU Jian(Yunnan Southern Geological Exploration Engineering Co.,Ltd.,Dali 671000,China)

机构地区：[1]云南南方地勘工程有限公司,云南大理671000

出　　处：《粉煤灰综合利用》2024年第3期91-96,共6页Fly Ash Comprehensive Utilization

摘　　要：针对变质岩类顺层边坡的失稳模式及失稳范围研究,对于保障人民生命财产安全是有重要意义和工程应用价值。以某工业园区石化场地拟开挖的变质岩类顺层边坡为研究对象,对试验段边坡地质环境、岩土特征进行调查,建立边坡开挖失稳室内相似试验模型,获得边坡失稳破裂迹象及其形成机制。结果表明:以硬性结构面为主的边坡,节理发育可见迹长3.0~7.0 m居多,多呈张开状态;边坡变形破坏模式为坡面侵蚀冲刷和滑移-拉裂,其中,滑移-拉裂破坏是此类边坡失稳破坏的典型且主要模式;当边坡以缓倾角(30°)开挖边时,在3~5级边坡失稳范围较大,其裂缝张开宽度及向坡体内部延伸深度均较大,有多级失稳风险。研究成果可为建立科学、合理的边坡稳定性及失稳范围预测评价方法提供有益支撑。The study of the instability mode and range of metamorphic rock bedding slopes is of great significance and engineering application value in ensuring the safety of people′s lives and property.Taking the metamorphic rock bedding slope to be excavated at a petrochemical site in a certain industrial park as the research object,the geological environment and geotechnical characteristics of the experimental section slope were investigated,and an indoor similarity test model for slope excavation instability was established to obtain signs of slope instability and fracture and their formation mechanisms.The results show that for slopes with mainly hard structural planes,the visible trace length of joint development is mostly 3.0-7.0 meters,mostly in an open state;The deformation and failure modes of the slope are erosion erosion and sliding tensile cracking on the slope surface;Among them,slip tensile failure is a typical and main mode of instability and failure of such slopes;When the slope is excavated at a gentle inclination angle(30°),the instability range of the 3-5 level slope is large,and the crack opening width and depth extending into the interior of the slope are both large,posing a multi-level instability risk.The research results can provide useful support for establishing scientific and reasonable methods for predicting and evaluating slope stability and instability range.

关 键 词：变质岩 顺层边坡 破裂迹象 边坡开挖失稳范围 

分 类 号：U213.13[交通运输工程—道路与铁道工程]