矸石混凝土巷旁充填体材料及合理宽度研究

Research on roadside filling body materials and reasonable width of gangue concrete

为了降低巷旁充填成本以及保证留巷体系的稳定,以神磊煤矿150202综采工作面为背景,以煤矸石、粉煤灰为基料制作巷旁充填体,通过正交试验、理论分析、数值模拟、现场实测等研究方法,研究充填材料的最佳配比、不同充填宽度对巷道围岩屈服应力和变形规律。结果表明:矸石充填体的最佳配比为水灰比1∶1.85,粉煤灰替代水泥率为20%,细粗骨料比35∶65,硅酸钠质量分数为6%;沿空留巷巷旁充填体宽度越大,巷道围岩的变形量和煤帮的垂直应力越低;综合对比不同宽度下围岩所受应力与围岩位移,沿空留巷巷旁充填体的合理宽度为1.2 m。

In order to reduce the cost of roadside filling and ensure the stability of the retained roadway system,the 150202 fully mechanized mining face of Shenlei Coal Mine is taken as the background,and the roadside filling body is made of coal gangue and fly ash as the base material,through orthogonal experiments,theoretical analysis,numerical simulation,on-site measurement and other research methods,the optimal ratio of filling materials and the laws of yield stress and deformation of roadway surrounding rock with different filling widths are studied.The results show that the optimal ratio of gangue filling body is water cement ratio 1∶1.85,fly ash replacement cement ratio of 20%,fine coarse aggregate ratio of 35∶65,and sodium silicate content of 6%;the larger the width of the roadside filling body next to the gob-side entry retaining,the lower the deformation of the surrounding rock and the vertical stress of the coal wall;by comprehensively comparing the stress and displacement of surrounding rock under different widths,it is concluded that the reasonable width of the roadside filling body next to gob-side entry retaining is 1.2 m.