摘要
为了提高煤炭资源的回采率,解决大同矿区云岗矿压煤严重的问题,释放更多的“三下”压煤,采用膏体充填开采工艺对工作面煤层进行开采。将该煤矿的煤矸石作为充填骨料,以粉煤灰、水泥为胶结剂制备胶结料浆;设计煤矸石、粉煤灰、水泥胶结充填体强度试验,确定充填材料质量分数81%为本次研究的固定含量;通过测得养护龄期为28 d的煤矸石∶粉煤灰∶水泥质量比为30∶3∶2配比,在满足膏体充填材料的流动性能的前提下,其充填体早期抗压强度为0.75 MPa,龄期28 d抗压强度为5.37 MPa,达到膏体充填抗压强度要求;采用3DEC数值模拟软件对8401工作面膏体充填开采前后上覆岩层位移变化情况模拟分析,采用膏体充填开采后,顶板下沉量减小至200 mm左右,地表沉陷控制取得了良好的效果。
Paste filling was adopted in working face to improve the recovery rate of coal resources,solve the serious coal pressure,and release more pressure in mining under buildings,roadways,and water bodies in Yungang Mine,Datong Mining area.The cement slurry was prepared with the coal gangue as the filling aggregate,and fly ash and cement as the cementing agents;the strength test of the cemented filling body by gangue,fly ash,and cement was designed.The filling material mass fraction of 81%was determined to be the fixed content for this study.The measurement showed the mass ratio of gangue,fly ash,and cement to be 30∶3∶2 at 28 d.Under the premise of satisfying the fluidity of the paste filling material,the early compressive strength of the filling body was 0.75 MPa,and the compressive strength was 5.37 MPa at 28 d,which met the compressive strength requirement for the paste filling.We simulated and analyzed the displacement of the overlying strata before and after paste-filling mining in the No.8401 working face by 3DEC numerical simulation software.The results showed that after the paste-filling mining,the roof subsidence decreased to about 200 mm and the surface subsidence was well controlled.
作者
李硕森
徐青云
吴季洪
LI Shuosen;XU Qingyun;WU Jihong(College of Coal Engineering,Shanxi Datong University,Datong 037003,China)
出处
《山西煤炭》
2023年第4期7-13,共7页
Shanxi Coal
基金
山西大同大学2022年研究生教育创新项目(22CX37)。
关键词
膏体充填
覆岩移动
数值模拟
煤矸石
paste filling
overburden movement
numerical simulation
coal gangue
