采动影响下底板瓦斯抽放巷稳定性研究

Study on Stability of Floor Gas Drainage Roadway under Influence of Mining

针对某矿底板瓦斯抽放巷受上部煤层采动影响破坏严重的现象,采用UDEC数值模拟对9#煤层开采过程中底板瓦斯抽放巷的稳定性进行分析,研究了采动影响下支承应力在煤层底板中的传播规律、底抽巷应力场、塑性区分布和围岩位移变化情况。通过采用锚杆锚索联合支护的方式,顶底板和两帮位移量明显减小,取得了较好的支护效果,保证了采动后底抽巷的抽采效果。

In the light of roadway above seam mining influence destruction of the phenomenon of a coal mine drainage plate, we made a simulation on the stability of drainage roadway in floor of No. 9 coal seam gas exploitation of UDEC numerical analysis.Studying on the propagation law under the influence of mining, the support stress in the coal seam floor roadway of bottom stress field, plastic zone distribution and displacements of surrounding rock.The roof,floor and two for displacement decrease obviously by using the combined support with bolt and cable way,which made a good supporting effect and ensured the rear bottom roadway drainage mining.