强含水层下巷式充填采煤覆岩破坏规律研究

Numerical Simulation on the overlying strata failure law of roadway backfill under strong aquifer

为了进一步研究强含水层下巷式充填覆岩的移动变形机理,得到巷式充填覆岩导水裂隙带发育规律,利用FLAC3D数值模拟软件,结合公格营子矿区的地质条件建立矿区三维模型,模拟导水裂隙带的发育情况。分别模拟分析了采厚、充填率及充填体弹性模量三种影响因素下巷式充填导水裂隙带的发育情况,回归分析得出了各影响因素下导水裂隙带的高度公式。公格营子矿巷式充填开采结果表明,强含水层下巷式充填采煤是安全可行的且经济效益显著。

In order to further study the movement and deformation mechanism of overlying strata with roadway backfill under the strong aquifer and to obtain the development law of the water-conducting fissure zone,the coal mine 3 D model is established combining with the geological conditions of the Gonggeyingzi Mining Area,then FLAC^3 D numerical simulation software is utilized to simulate the development of the water-conducting fissure zone in the coal mine. In this paper,the development of water-conducting fissure zone under three influence factors,such as mining thickness,filling rate,and elastic modulus of backfill,are simulated respectively. The height formulas of water-conducting fissure zone with different influence factors are obtained by regression analysis. The practice results show that,it is safe and feasible to use roadway backfill mining under the strong aquifer,and the economic benefit is remarkable.