摘要
为了揭示强降雨作用下缓倾角岩层凸边坡剪切滑动破坏机理及其控制措施。本文以宝日希勒露天煤矿边坡为例,采用牛顿力现场监测和FLAC^(3D)三维数值模拟相结合的方法,研究冻融作用下缓倾角岩层凸边坡的内部牛顿力演化规律,分析强降雨作用下无支护和高预应力锚索支护条件下凸边坡的变形规律和塑性区分布特征。研究结果表明:露天煤矿开采形成典型的凸边坡,凸边坡在局部应力集中和卸荷回弹变形共同作用下产生显著变形;在凸边坡解冻期,凸边坡北部边坡产生牛顿力降低,东部边坡产生牛顿力增加;在强降雨作用下,岩体容重增加,边坡内形成裂隙水压力,增加了边坡岩体的滑动力,同时煤层间碳质泥岩强度遇水弱化,形成缓倾角软弱结构面,从而导致边坡岩体沿软弱结构面的整体水平剪切滑动;高预应力锚索可以有效增加缓倾角边坡的整体性,减小由于降雨引起的边坡塑性变形。本文研究工作为后期宝日希勒露天煤矿凸边坡的变形控制和支护设计提供了依据。
To reveal the shear creep failure mechanism and control measures of gently inclined rock convex slope under heavy rainfall.In this study,the convex slope of Baorixile open-pit coal mine is taken as an example.The Newton force field monitoring and FLAC^(3D)numerical simulation are used to study the internal Newton force evolution law of the gently inclined rock convex slope under freezing-thawing action,and the deformation law and plastic zone distribution characteristics of the convex slope under the condition of no support and high prestressed anchor cable support under the action of heavy rainfall are analyzed.The results show that typical convex slope is formed in open-pit coal mining,and the convex slope deforms significantly under the combined action of local stress concentration and unloading rebound deformation.During the thawing period of convex slope,the Newton force on the northern slope decreases,while the Newton force on the eastern slope increases.Under the action of heavy rainfall,the bulk density of rock mass increases,resulting in the formation of fissure water pressure in the slope,which increases the sliding power of the rock mass of the slope.Meanwhile,the strength of the carbonaceous mudstone between coal seams is weakened by water,resulting in the formation of a gently inclined structural plane,which leads to the overall horizontal shear sliding of the rock mass along the soft structural plane.The high prestressed anchor cable can effectively increase the integrity of the gently inclined rock slope and reduce the slope plastic deformation caused by rainfall.The research work in this study provides a basis for deformation control and support design of convex slope in Baorixile open-pit coal mine.
作者
张周爱
李新鹏
缪卫峰
周志伟
史广诚
ZHANG Zhouai;LI Xinpeng;MIAO Weifeng;ZHOU Zhiwei;SHI Guangcheng(Baorixile Open-pit Coal Mine,National Energy Baorixile Energy Co.,Ltd.,Hulunbeier 021000,China;State Key Laboratory for Tunnel Engineering,China University of Mining and Technology,Beijing 100083,China;School of Mechanic and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《中国矿业》
北大核心
2024年第S01期128-136,142,共10页
China Mining Magazine
基金
博士后科学基金项目资助(编号:2022M713385)
关键词
露天煤矿
凸边坡
软弱结构面
剪切滑动
数值模拟
open pit coal mine
convex slope
weak structural surface
shear sliding
unmerical simulation
作者简介
第一作者:张周爱(1984—),男,湖北蕲春人,高级工程师,主要从事露天矿技术管理工作,E-mail:313823486@qq.com;通讯作者:史广诚(1990—),男,汉族,河南焦作人,博士后,主要从事滑坡监测预警控制方面的研究,E-mail:shiguangcheng1990@163.com。
