煤层开挖诱发反倾岩体边坡失稳的离心试验和数值模拟  

Centrifugal test and numerical simulation on the instability ofreverse inclined rock slope induced by coal seam excavation

作　　者：李晨杰 李波[2] LI Chen-jie;LI Bo(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《河南城建学院学报》2025年第2期1-8,共8页Journal of Henan University of Urban Construction

基　　金：国家自然科学基金项目(52208329);中央级公益性科研院所基本科研业务费(CKSF2023327/YT)。

摘　　要：人为扰动引起岩体边坡应力场重分布,致使边坡产生变形甚至失稳破坏。基于鸡冠岭山体倾倒崩塌的原型,采用大型岩土离心模型试验和离散元数值模拟方法,研究煤层开挖条件下反倾岩体边坡的变形和失稳破坏模式。在离心模型中,研制了离心场中煤层开挖模拟装置,再现了煤层开挖诱发反倾岩体边坡弯曲—折断—倾倒的破坏过程。基于离心模型尺寸和材料参数建立离散元模型,开展岩体强度、层面力学参数和煤层开挖厚度等分析,发现岩体强度和界面强度越低,煤层开挖过程中边坡变形越大且更易产生整体失稳;煤层作为支撑上覆岩体的关键块体,开挖层厚越大,边坡在开挖后的破坏程度也越大。Human disturbance will cause the stress field redistribution of the rock slope,resulting in deformation and even instability failure of the slope.Based on the prototype conditions of Jiguanling toppling and collapse,the deformation and instability failure modes of reverse inclined rock slope under coal seam excavation are studied using large-scale centrifugal model test and discrete element numerical simulation.In the centrifugal model,the simulation device of coal seam excavation in centrifugal field is developed,and the destruction process of bending-breaking-dumping of reverse inclined rock slope induced by coal seam excavation is reproduced.The discrete element model is established based on the size of the centrifugal model and material parameters.Through analysis of rock strength,layer mechanical parameters and coal seam excavation thickness,it is found that the lower the strength of rock mass and the interface strength,the greater the deformation of slope and the easier to produce the overall instability during coal seam excavation.As the coal seam acts as a key block supporting the overlying rock mass,the thicker the coal seam is excavated,the more severe the slope failure after excavation becomes.

关 键 词：岩体边坡 煤层开挖 稳定性 离心模型试验 离散元 

分 类 号：TU45[建筑科学—岩土工程]