岩溶区高陡岩质边坡崩塌变形破坏机制研究  

On Collapse Deformation and Failure Mechanism of High Steep Rock Slope in Karst Area

作　　者：李升科 张烽[2] LI Shengke;ZHANG Feng(Southwest Branch,China Communications Construction Co.,Ltd.,Chengdu 610096,China;CCCC Second Highway Survey and Design Institute Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]中国交通建设股份有限公司西南分公司,成都610096 [2]中交第二公路勘察设计研究院有限公司,武汉430050

出　　处：《路基工程》2025年第1期231-237,共7页Subgrade Engineering

摘　　要：针对岩溶区某在建高速公路隧道边仰坡发生严重崩塌变形破坏案例,开展地质调绘、工程测量、工程物探、工程钻探等综合手段,查明崩塌区工程地质条件,采用UDEC离散元方法对其崩塌变形破坏机制进行研究。结果表明:本次严重崩塌变形破坏的成因是受地质构造影响,沿高陡岩质边坡节理裂隙及卸荷裂隙发育的溶隙溶槽在强降雨入渗及隧道开挖应力重分布作用下,形成楔形崩塌变形,从而诱发溶蚀凹槽填充物发生牵引滑塌;整个崩塌过程可分为启动加速、高速运动、碰撞减速和缓动夯实等四个阶段,整个崩塌体运动距离超过100 m,严重威胁隧道施工和运维安全;提出分级放坡+坡面防护+明洞+短路基的处治方案,治理效果良好。For the case of serious collapse deformation and failure occurred on the side slope of a highway tunnel under construction in karst area,comprehensive means,such as geological mapping,engineering survey,engineering geophysical prospecting and engineering drilling,were carried out to find out the engineering geological conditions of the collapse area.The UDEC discrete element method was adopted to study the mechanism of collapse deformation and failure.The result shows that,the cause of this serious collapse deformation and failure is,due to geological structure and under the action of heavy rainfall infiltration and tunnel excavation stress redistribution,the karst grooves develop along the joint fissures and unloading fissures of high and steep rock slopes and form wedge-shaped collapse deformation,which induces the dissolution groove filler to induce traction slump.The whole collapse process can be divided into four stages:starting acceleration,high-speed movement,collision deceleration and slow tamping.The movement distance of the whole collapse body exceeds 100 m,which seriously threatens the safety of tunnel construction and operation&maintenance.The treatment scheme of grading slope+slope protection+open cut tunnel+short subgrade is put forward,with good treatment effect achieved.

关 键 词：高陡边坡 岩溶 崩塌 灾变机制 优势结构面 处治效果 运维安全 

分 类 号：P642.22[天文地球—工程地质学]