残采工作面过空区相似模拟研究

Analog Simulation Research on Residual Coal Face Through Goaf

以圣华煤业3#煤层残煤复采工作面过6 m空区为工程背景,通过建立空区顶板关键块的力学模型,运用1∶30比例的物理相似模拟实验,对比研究随着工作面推进,空区内有无充填体两侧煤体应力和围岩的破坏情况。研究表明:通过老顶力学模型算出空区充填体的支护强度为3.82MPa。充填过空区基本顶初次垮落步距由30 m减少到24m。充填区距工作面8m时煤柱弹性核区宽度约为5 m,煤柱塑性破坏由4 m减小到1 m,充填体内产生最大应力为3.96 MPa。

Taking the residual coal face through 6 m goaf at the 3#coal seam of Shenghua Coal Mine as engineering background,the mechanical model of key block in goaf roof was built,and the physical analog simulation experiment was carried out at the scale of 1∶30.Then,the presence of coal stress and surrounding rock failure on two sides of filling body along the development of working face was compared and studied.The results showed that the calculated backfilling support strength was 3.82 MPa by the mechanics model of old roof.The first caving interval of basic roof was reduced from 30 mto 24m.The elastic district width of coal pillar was about 5 m when the distance between filling area and working face was 8m.The plastic damage of coal pillar was decreased from 4mto 1m.And the maximum stress in filling body was 3.96 MPa.