公路下煤层群开采地表移动变形防治研究--以攀枝花煤矿为例  

On Surface Movement and Deformation Prevention and Control in Coal Seam Group Mining Under Highways:A Case Study of Panzhihua Coal Mine

作　　者：罗畅 刘萍[1] 贾毅超 陈镇 王子一 敖以章 LUO Chang;LIU Ping;JIA Yichao;CHEN Zhen;WANG Ziyi;AO Yizhang(College of Mining,Guizhou Uuniversity,Guiyang 550025,China;Guizhou Heze Engineering Management Consulting Co.,Ltd.,Xingyi 562400,China;Panzhihua Coal Mine Jichang Township of Shuicheng County,Guizhou Guineng Investment Co.,Ltd.,Liupanshui 553000,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州禾泽工程管理咨询有限公司,贵州兴义562400 [3]贵州贵能投资股份有限公司水城县鸡场乡攀枝花煤矿,贵州六盘水553000

出　　处：《矿业工程研究》2023年第4期32-42,共11页Mineral Engineering Research

基　　金：贵州省科技计划资助项目(黔科合基础[2020]1Z047)。

摘　　要：伴随着国内煤炭资源日益枯竭,矸石堆积问题日益严重,“三下”煤体绿色开采再次被重视.以贵州攀枝花煤矿11071工作面为工程背景,通过室内试验、工艺优化、数值模拟等方法论证充填方案是否可行.室内试验得出矸石膏体材料的优化质量比为6.5∶1.4∶2.1,并采用SEM对内部微观分析发现,水泥水化产生碱性环境,激发粉煤灰活性,充填强度有所增强.基于开采条件、充填设备等因素考虑,对充填回采工艺进行优化设计,回采支护环节与充填环节相互协作.数值模拟结果显示:在5#煤层开采结束的条件下,11071工作面充填回采完成后,位移场叠加作用不明显,5#煤层顶板位移量由最初的37 mm缓慢增加至42.7 mm,较未用充填开采而言,充填开采可有效防治覆岩、地表移动变形.工程实践表明:充填后的采面回采结束后,沉降变形最大值为43 mm,水平变形最大值约为2.53 mm/m,符合公路路基移动变形的合理范围.With the exhaustion of domestic coal resources,the gangue accumulation is becoming more and more serious.Taking the 11071 working face of Panzhihua Coal Mine in Guizhou province as the engineering background,the feasibility of the filling scheme is proved through laboratory test,process optimization and numerical simulation.According to the laboratory test,the optimized mass ratio of gangue gypsum body material is 6.5∶1.4∶2.1.When SEM is used for internal microscopic analysis,it is found that cement hydration produces alkaline environment,stimulates the activity of fly ash and enhances the filling strength.It is also found that cement hydration produces an alkaline environment,activates the activity of fly ash and enhances the filling strength.Based on the mining conditions,filling equipment and other factors,the design of filling stoping process is optimized,and stoping support link and filling link cooperate.According to the numerical simulation,the superposition of displacement field is not obvious after the filling stoping of 11071 working face at the end of No.5 coal seam mining.The displacement of No.5 coal seam roof slowly increases from 37 mm to 42.7 mm.Compared with that without filling mining,filling mining effectively prevents overburden and surface movement and deformation.The engineering practice shows that the maximum settlement deformation is 43 mm and the maximum horizontal deformation is about 2.53 mm/m after the stoping of the filling surface,which is in line with the reasonable range of roadbed movement deformation.

关 键 词：“三下”开采 煤层群 充填开采 地表移动 

分 类 号：TD325[矿业工程—矿井建设]