急倾斜薄煤层工作面推进速度对顶板岩层活动的影响

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FLAC3D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2.4m/d增加到4.8m/d时,工作面煤壁处顶板垂直应力从13.95MPa降低到12.38MPa,降低了12.68%;煤壁前15m处顶板垂直应力从19.02 MPa降低到17.51MPa,降低了8.62%;顶板最大下沉量由0.93m降低到0.50m。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。

The influence of advancing speed on the activity of roof strata in thin coal seam with steeply inclined

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, FLAC3D simulation software was used to simulate the vertical stress field and displacement field of the roof at different propulsion speeds.And the roof activity was 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 2.4m/d to 4.8m/d, the vertical stress of the roof wall is reduced from 13.95MPa to 12.38MPa at the working face, which is reduced by 12.68%.The vertical stress of the roof wall in front ofS15m decreased from 19.02MPa to 17.51MPa, which is 8.62% lower than 2.4m/d. The maximum sinking amount of the roof was reduced from 0.93m to 0.50m. 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.