长壁综采矸石与粉煤灰充填技术及地表沉陷分析

Gangue and Fly-ash Stowing Technology of Long-wall Full-mechanized Mining and Surface Subsidence Analysis

固体充填开采能够有效兼顾煤炭开采经济效益与环境效益,是一种较好的绿色开采技术,在国内获得初步应用,但实测资料较少。介绍邢台煤矿7606工作面长壁综采矸石与粉煤灰充填采煤工艺,并结合观测站实测资料和FLAC3D数值模拟手段,研究固体充填开采在减少地面下沉中的作用,并研究不同充填率和充填体不同弹性模量条件下地表下沉规律。通过观测站实测结果分析,固体充填开采在减少地面下沉方面效果明显。通过数值模拟分析,随着充填率由100%逐渐减少,地表下沉最大值则逐渐增加,充填率对地表下沉的影响很大。随着充填体弹性模量从0.24GPa增大到24GPa,地表最大下沉值迅速减小,但当充填体弹性模量增大到4GPa以后,地表移动变形值的变化不很明显。

Solid stowing mining is a good green mining technology because it effectively gives attention to economic and environmental profit of coal mining. It has been applied initially in China, but observation data was absent. This paper introduced the mining tech- nique of gangue and fly-ash stowing in 7607 face of Xingtai Colliery. Applying FLAC3D, it researched action of stowing on reducing surface subsidence and rules of surface subsidence under different stowing ratio and different elastic module on the basis of observation data. Observation data showed that solid stowing made distinct effect in reducing surface subsidence. Numerical simulation results showed that the maximum value of surface subsidence increased with stowing ratio reducing from 100% , stowing ratio influenced sur- face subsidence largely, and that the maximum value rapidly decreased with elastic module of stowing body increasing from 0 to 24GPa, but when it reached 4GPa, surface subsidence and deformation value do not change too obviously.