基于FEM的改良煤矸石边坡稳定性分析  

Stability analysis of improved coal gangue slope based on FEM

作　　者：李瑞杰 李学丰 LI Rui-jie;LI Xue-feng(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;Ningxia Highway Administration Center,Yinchuan 750011,Ningxia,China;Institute of Solid Mechanics,Ningxia University,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,宁夏银川750021 [2]宁夏公路管理中心,宁夏银川750011 [3]宁夏大学固体力学研究所,宁夏银川750021

出　　处：《地基处理》2023年第2期144-151,共8页Journal of Ground Improvement

基　　金：国家自然科学基金资助项目(1216020092);宁夏科技创新领军人才计划项目(KJT2019001);宁夏“多尺度力学与工程应用自治区科技创新团队”。

摘　　要：煤矸石是煤矿开采后的固体废物,堆积后的煤矸石排土场持续影响矿区生态,其边坡稳定特性受到广泛关注。本文以宁夏宁东某矿区生态实施修复重建的煤矸石边坡为例,对边坡结构进行改良,构建基于水土保持特性的改良煤矸石边坡,构建草植层、渗流层和过滤层的分层边坡结构,可以提高边坡稳定性,初步满足土地复垦需要。基于FEM建立了改良煤矸石边坡数值模拟模型。数值模拟结果表明,在平面应变试验条件下,会产生“X”型剪切带,剪切带的发育程度与围压及应力水平相关;改良煤矸石边坡失稳易发生在边坡坡脚处,在剪应力与水平力共同作用下,会发生较大的变形,产生较大位移;持续降雨对改良煤矸石边坡的影响较小。研究结果为矿区改良煤矸石边坡稳定性实践和矿区生态环境安全提供了参考。Coal gangue is a type of solid waste after coal mining.The coal gangue stock dump continues to affect the ecology of the mining area,and its slope stability characteristics have received extensive attention.This paper takes the coal gangue slope of Ningdong mining area as an example to improve the slope structure.An improved coal gangue slope was constructed based on the characteristics of water and soil conservation.The layered slope structure of grass planting layer,seepage layer and filter layer can effectively improve the slope stability and initially meet the needs of land reclamation.The numerical model of the improved coal gangue slope was established based on FEM.The numerical simulation results show that an ‘X'-shaped shear band is generated under the condition of the plane strain test,and the development degree of the shear band is related to the confining pressure and stress level.The slope instability easily occurs at the toe of slope.When the shear stress and the horizontal force act together,a large deformation and displacement occur.However,the continuous rainfall has little effect on the stability of the improved coal gangue slope.The research results provide a reference for improving the stability of coal gangue slopes in the mining area and the safety of the ecological environment in the mining area.

关 键 词：煤矸石排土场 边坡 稳定性 降雨 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]