基于离散元方法的重复采动对顺层岩质边坡稳定性的影响研究  

Study on the Influence of Repeated Mining on the Stability of Bedding Rock Slope based on Discrete Element Method

作　　者：许一川 周建伟 李莹 师永霞 徐啸川 XU Yichuan;ZHOU Jianwei;LI Ying;SHI Yongxia;XU Xiaochuan(Ecological Environment Geo-Service Center of Henan Geological Bureau,Zhengzhou 450053,China;Sichuan-Tibet Railway Co.,Ltd.,Chengdu 610094,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]河南省地质局生态环境地质服务中心,郑州450053 [2]川藏铁路有限公司,成都610094 [3]中国地质大学(武汉)工程学院,武汉430074

出　　处：《粉煤灰综合利用》2025年第2期54-59,共6页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金项目(51674099)。

摘　　要：为研究重复采动对顺层岩质边坡稳定性的影响,基于离散元的方法,利用UDEC软件建立二维数值模型,通过分析不同开采深厚比、不同开采位置边坡的力学特征,得出其力学响应机制。结果表明:开采深厚比的变化对基底岩层影响十分显著,随着深厚比的减小,基底岩层位移不断增大,剪应力不断减小,垂直应力不断增大,层面抗剪强度降低,进而导致坡体稳定性降低;开采深厚比的减小,使陡崖岩体下沉,进而导致软弱夹层位移量增大;当深厚比不同时,软弱夹层水平位移曲线变化规律大致相同,整体上均呈现“先增大后减小”的变化趋势。研究可为顺层岩质边坡矿山的开采提供参考。In order to study the effect of repeated mining on the stability of bedding rock slope,this paper uses UDEC software to establish a two-dimensional numerical model based on the discrete element method.Through analyzing the mechanical characteristics of the slope under different mining depth ratios and different mining positions,the mechanical response mechanism is obtained.The main conclusions of this paper are as follows:the change of mining depth ratio has a significant impact on the basement rock,and with the decrease of the depth ratio,the displacement of the basement rock stratum is increasing,the shear stress is decreasing,the vertical stress is increasing,and the shear strength of the layer is decreasing,which leads to the reduction of slope stability;The reduction of the mining depth ratio will cause the steep rock mass to sink,and then lead to the increase of the displacement of the weak interlayer;When the depth ratio is different,the horizontal displacement curve of the weak interlayer has the same change rule,and the overall trend is"increase first and then decrease";The study can provide a reference for the mining of bedding rock slope mines.

关 键 词：顺层岩质边坡 离散元 重复采动 稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]