深井煤体横向变形监测方法与阶跃变形特征  

Monitoring method for coal-mass lateral deformation in deep mining and characteristics of step deformation

作　　者：陈绍杰[1,2] 王怀远[1] 朱彦[1] 尹大伟[1] 屈晓[1] 刘勇[1] 

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《岩石力学与工程学报》2016年第A02期4121-4128,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51474134);教育部新世纪优秀人才支持计划(NCET–13–0880);山东省杰出青年基金项目(JQ201612)~~

摘　　要：煤体变形特别是横向变形因便于监测,故可以作为衡量煤体稳定性的重要指标。为研究深井煤体横向变形,设计3 000 mm大量程高频率煤体横向变形监测方法和监测仪,采用预先钻孔安装方式对采深超过1 000 m的唐口煤矿煤体进行了长期监测。结果表明：顶板运动和大采宽条带开采工作面空间结构作用造成了煤体横向变形的大趋势,煤体横向变形在工作面前方30-40 m时开始趋于明显,显著变形出现在工作面推过测站28-36 m时,工作面推过测站90 m左右,煤体横向变形相继趋于平缓;监测煤体最大横向变形仅为287 mm,较同矿井其他区域煤体变形偏小,原因为该区域煤体未受重复采动影响、巷道与最大地应力方向夹角较小、层理性砂岩顶板易于破断;首次监测到由于深井煤体受压能量积聚释放造成煤体不连续破坏而导致横向变形呈现出非连续、阶跃式、突变性特征,深井煤体在表现出塑性的同时,其弹性、脆性和冲击性特征表现的也更加明显。Coal-mass deformation,especially the lateral deformation,can be used as an important indicator to evaluate the stability of coal pillar. One high frequency and larger monitoring range of 3 000 m method was designed to monitor the lateral deformation of coal mass in Tangkou coal mine over 1 000 m mining depth. The monitoring results show that the movement of roof and the spatial structure around the strip mining panel cause the lateral deformation trend of coal mass. The lateral deformation becomes large when the station is in 30–40 m front of the working face. The prominent deformation appears when working face passes the station about 28–36 m. The deformation curves become flat successively when working face passes the station about 90 m. The maximum lateral deformation of 287 mm is smaller than that of other coal-mass in the same coal mine. The reasons are without influence of repeated mining,the small angle between roadway and the maximum stress and the bedding sandstone roof easy to break out. Some new characters as discontinuous,step and mutation of coal-mass lateral deformation in deep mining are monitored,which are caused by energy accumulation and release leads coal-mass discontinuous damage in deep mining. Those coal-masses show more plasticity and more elasticity,brittleness and burst tendency at the same time.

关 键 词：采矿工程 深部煤体 横向变形 监测方法 空间结构 非连续 阶跃变形 

分 类 号：TD32[矿业工程—矿井建设]