摘要
基于长壁开采工艺在近距离煤层群开采中存在的地应力适应性差且煤层开采后导致下伏煤层巷道围岩变形严重,难以实现近距离煤层的安全高效开采问题。以某矿3上煤层充填工作面及3下煤层8300运输大巷为工程背景,借助于数值模拟试验、现场实测等技术手段,提出了矸石胶结连采连充技术(简称连采连充技术)并分析了该技术应用于近距离煤层开采后围岩运动规律,论证了采连充技术在近距离煤层群中应用的可行性。连采连充技术研究成果如下:(1)充填工作面设置支巷和煤柱巷进行开采,先采支巷,充填凝固后再采煤柱巷,实现了采充平行作业,工作面支巷及煤柱巷宽度均为5 m(此数据仅供参考);(2)数值模拟试验表明充填工作面围岩塑性区分布范围主要在0~5 m,应力峰值出现在煤柱巷为12.8 MPa,最大底鼓量及顶板下沉量出现在工作面中部分别为12.1 mm和80.2mm,底板破坏形态呈现"波浪形"分布;(3)现场实测表明充填工作面底板破坏形态大致分为上部破坏区、中部完整岩层带及下部塑性区3部分,充填工作面底板破坏最大深度为4.8 m,距3下煤层8300运输大巷15.35 m,不影响该大巷正常使用。连采连充技术目前已在新矿集团裕兴煤矿、孙村煤矿、翟镇煤矿等矿井进行了现场应用,在消化煤矸石的同时成功将近距离煤层安全高效的回采出来,取得了较好的经济效益、社会效益和环保效益。
Based on the long wall mining technology,the adaptability of in-situ stress is poor in the near distance coal seam group mining,and the surrounding rock deformation of the underlying coal seam roadway is serious after the coal seam mining,so it is difficult to realize the safe and efficient mining of the close coal seam.This paper takes the filling working face of 3 upper coal seam and No.8300 belt roadway of 3 lower coal seam as the engineering background,by means of numerical simulation test,field measurement and other technical means,this paper puts forward the technology of continuous mining and filling with gangue cementation(referred to as continuous mining and continuous filling technology),analyzes the surrounding rock movement law after the technology is applied to the mining of short distance coal seam,and demonstrates the feasibility of the application of the technology in the close distance coal seam group.The research results of continuous mining and continuous filling technology are as follows:(1)branch roadway and coal pillar roadway are set in filling working face for mining.Firstly,the branch roadway is filled and solidified,and then the pillar roadway is mined.The mining and filling parallel operation is realized.The width of branch roadway and coal pillar roadway is 5 m(this data is for reference only);(2)The results of numerical simulation show that the plastic zone of surrounding rock is mainly distributed in the range of 0~5 m,the peak stress appears in the coal pillar roadway,which is 12.8 MPa.The maximum floor heave and roof subsidence appear in the middle of the working face,which are 12.1 mm and 80.2 mm respectively;(3)The field measurement shows that the failure modes of the floor of the filling face are roughly divided into three parts:the upper failure zone,the middle intact rock zone and the lower plastic zone.The maximum depth of the floor failure of the filling working face is 4.8 m,which is 15.35 m away from the No.8300 belt roadway of the No.3 coal seam,which does not affect the
作者
张志勇
耿华锋
张新国
王东生
宋美丽
ZHANG Zhiyong;GENG Huafeng;ZHANG Xinguo;WANG Dongsheng;SONG Meili(Xinwen Mining Group Co.Ltd,Taian 271219,China;School of mining and safety engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第S02期245-250,共6页
Coal Science and Technology
基金
山东省重点研发项目资助项目(2019SDZY0403)
关键词
矸石胶结
连采连充
近距离煤层
模拟研究
现场实测
gangue cementation
continuous mining and continuous charging
contiguous coal seam
simulation study
field measurement
