摘要
为了研究急倾斜薄煤层工作面推进速度对顶板岩层活动的影响规律,以新铁煤矿99#煤层的赋存条件及开采情况为研究背景,运用FLAC 3D数值模拟软件,分别对不同推进速度下的顶板垂直应力场以及位移场进行模拟,并分析了不同推进速度下的顶板活动情况。结果表明:工作面推进速度对顶板岩层的应力分布、下沉量有显著影响。当工作面推进速度从2.4 m/d增加到4.8 m/d时,工作面煤壁处顶板垂直应力从13.95 MPa降低到12.38 MPa,降低了12.68%;煤壁前15 m处顶板垂直应力从19.02 MPa降低到17.51 MPa,降低了8.62%;顶板最大下沉量由0.93 m降低到0.50 m。适当提高急倾斜薄煤层工作面推进速度,顶板垂直应力和下沉量均降低,有利于顶板稳定。
In order to study the influence of the advancing speed of the steeply inclined thin coal face on the activities of roof strata,based on the occurrence condition and mining situation of No.99 coal seam in Xintie coal mine,FLAC 3D simulation software is used to simulate the vertical stress field and displacement field of the roof at different propulsion speeds.And the roof activity is analyze under different advancing speeds.The results show that the advancing speed of the working face has a significant influence on the stress distribution and subsidence of roof strata.The working face advancing speed increasing from 2.4 m/d to 4.8 m/d,the vertical stress of the roof wall is reduced from 13.95 MPa to 12.38 MPa at the working face,which is reduced by 12.68%.The vertical stress of the roof wall in front of 15 m decreased from 19.02 MPa to 17.51 MPa,which is 8.62%lower than 2.4m/d.The maximum sinking amount of the roof is reduced from 0.93 m to 0.50 m.With the advancing speed increased suitably in steeply inclined thin coal seam,the vertical stress and the sinking amount of the roof are both lowered,which is beneficial to the stability of the roof.
作者
秦涛
段燕伟
QIN Tao;DUAN Yanwei(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Mining Engineering of Heilongjiang Province College,Heilongjiang University of Science and Technology,Harbin 150022,China)
出处
《中国矿业》
北大核心
2020年第3期130-134,共5页
China Mining Magazine
基金
国家自然科学基金项目资助（编号：51604100
51674107）
国家重点研发计划资助项目资助（编号：2016YFC0600901）
关键词
急倾斜薄煤层
推进速度
顶板岩层
数值模拟
steeply inclined thin coal seam
advancing speed
roof strata
numerical simulation
