海下软覆岩煤层顶板离层水发育规律数值模拟研究

运用离散元软件对某矿海下软弱覆岩2煤顶板离层水空间发育规律进行了数值模拟研究,结果证明:顶板软弱覆岩条件下会发生离层现象,在4.36 m采高和开挖步距为10 m情况下,开挖距离为200 m时会发生3次离层现象,且离层发展一直处于"产生—发展—闭合稳定—产生"的循环过程;根据工作面突水特征、突水水源和突水通道等因素分析,并与数值模拟结果进行对比,得出该矿工作面突水并不是导水断裂带直接导通互层含水层所致,而是由于离层突水所致。

Numerical Simulation Research on Roof Bed-separation Water Development Rule of Submarine Coal Seam with Incompetent Overburden Rock

In this paper,numerical simulation research was made with the discrete element software on the space development rule of the roof bed-separation water of the submarine No.2 coal seam with incompetent overburden rock in a mine,the research results showed that when the roof was incompetent overburden rock,bed separation may occur,in the case of 4.36m mining height and 10m excavation space,three bed separation phenomenon occurred when the excavation distance was 200m,and the bed separation was always in a circulation process of "generation-development-closed and stable – generation".It was concluded from the analysis on the factors such as the face water inrush features,water inrush source and channels and the comparison with the numerical simulation results that the water inrush in the working face of this mine was not caused by the direct connection of the water flowing fractured zone with the inter-bed water-bearing stratum,but by the bed-separation water inrush.