龙固矿底板突水危害性预测

Prediction on Floor Water-inrush Hazard in Longgu Coal Mine

基于层状岩体渗流失稳条件,以突水因数作为突水判据,预测了龙固矿底板的突水危害性。根据龙固矿地质岩层柱状图,建立了一种有限元计算模型,采用RFPA2D模拟了采场推进到50 m和150 m时底板岩层的应变分布;利用渗透特性与应变的关系,映射出底板岩层的渗透特性分布,并计算了相应于这两个状态的突水因数。研究表明,随着工作面的推移,底板破坏范围不断扩大,变形相应地增大;由于岩层的破坏,其渗透率随应变按指数规律急剧增大,而非Darcy流β因子和加速度系数则按指数规律急剧减小,从而突水因数近似地按指数规律增大。

Prediction was made on the water inrush hazard from floor in Longgu Coal Mine according to the seepage and destabilizing condition of the bedded rock mass and by taking the water inrush factor as the criterion for water inrush.A finite element calculation model was established according to the geological column of rock mass in Longgu Mine,the strain distribution of floor rock stratum was simulated by using RFPA2D while the longwall face was advanced to 50m and 150m;the permeability characteristics and distribution of floor rock stratum were mapped out by using the relation between the permeability characteristics and strain,and the water inrush factors corresponding to these two conditions was calculated.The study showed that with the advance of the working face,the failure scope of floor rock stratum unceasingly extended and the strain correspondingly increased;the permeability rate of floor rock sharply increased with the strain in an exponential form,but the non-Darcy flow β factor and acceleration coefficient sharply decreased in an exponential form,as a result,the water inrush factor approximately increased in an exponential form.