急倾斜煤层沿空留巷的巷旁充填技术

针对急倾斜煤层沿空留巷巷旁充填技术难题,分析了新强煤矿巷旁充填材料合理配比及充填体承载特性,利用FLAC3D数值模拟软件分析了巷旁充填体及巷道围岩变形规律。结果表明:试件在一定的充填料配比条件下,随着水灰比的增加其抗压强度明显降低,新强煤矿充填材料水、水泥、沙子、矸石理想配比为1∶2∶4∶4;留设巷道顶底板的活动剧烈程度与距工作面距离相关,导致巷道顶板移近量不同;巷旁充填材料配比强度高于10 MPa,可以满足新强煤矿巷道围岩变形及充填体强度要求。

Roadside packing technique with gob-side entry retaining in steep coal seam

Aimed at addressing technical problem of roadside packing with gob-side entry retaining in steep coal seam, this paper presents an analysis of the rationa]L proportion of roadside packing materials and the bearing characteristics of packing body by experiments and a simulation of the deformation law of packing body and surrounding rock by FLAC3D. The results show that, with the certain proportion of road- side packing materials, the specimen shows a obviously decreasing compressive strength due to the in- crease in water cement ratio; that activity degree of the roof and the floor in entry retaining has relation with the distance from the working face, causing the different displacement of the tunnel roof, with the consequent differences in stages of the deformation and load characteristics of packing body; and that roadside packing material with the strength higher than 10 MPa could be up to the deformation of roadway surrounding rock and the strength of filling body in Xinqiang mine. The research could serve as basis for roadside packing with gob-side entry retaining in steep coal seams.