固体充填开采地表沉陷规律数值模拟

固体充填开采是近年来发展的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。结合一个试采工作面,采用FLAC3D数值模拟手段,对固体充填开采不同充填率及充填体不同弹性模量条件下地表下沉规律进行研究。研究表明,随着充填率从100%减小到50%,地表下沉最大值从312 mm增加到907 mm,充填率对地表下沉的影响很大,在选择充填开采的时候,保证充填接顶对防止地表变形过大很有帮助。随着充填体弹性模量从0.24 GPa增大到24 GPa,地表最大下沉值迅速减小,选择合理的充填体级配很重要,只要充填体达到抗变形能力即可。

Numerical Simulation of Surface Subsidence by Solid Backfill Mining

Solid backfill mining is a good green mining technology in recent years,which was applied initially in China with few measured data.This paper studied discipline of differnent solid filling rate and different elastic modulus under different conditions of surface subsidence with FLAC3D numerical simulation in a pilot coal face.The results showed that,with the filling rate decreased from 100% to 50%,maximum subsidence increased from 312 mm to 907 mm.Filling rate has great impact on subsidence.It is useful to guarantee filling top to prevent surface deformation in the choice of filling mining.With the filling bulk modulus increases from 24 GPa to 0.24 GPa,the maximum value of surface subsidence decreases rapidly.It is very important to choose a reasonable filling size which can meetthe requirement of the deformation resistance.