厚层软岩断顶充填沿空留巷关键参数研究  

Study on key parameters of filling gob-side roadway in the thick layer soft rock fault top

作　　者：唐芙蓉[1] 马占国[2,3] 杨党委 戚福周[2] 胡俊 陈永珩[3] TANG Furong;MA Zhanguo;YANG Dangwei;QI Fuzhou;HU Jun;CHEN Yongheng(School of Physics,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;School of Mechanics and Civil Engineering,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学物理学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [3]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2019年第6期1128-1136,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51674250,51734009)

摘　　要：针对厚层软岩顶板沿空留巷的技术难题,提出厚层软岩顶板断顶充填沿空留巷技术,创建"断顶卸压+巷旁垮落充填"沿空留巷围岩协调控制方法,构建厚层软岩断顶充填沿空留巷数值模型,研究断顶角度和预制裂缝间距对实体煤壁支承应力、巷旁垮落充填体稳定性对覆岩变形规律的影响。研究结果表明:断顶角度为5°时,减小了充填体上方岩层回转变形的空间,减小了剪切破坏区,缓解了采空侧顶板下沉剧烈程度;预制裂缝间隔为1 m时,在工作面后方,顶板岩层预制裂缝能及时扩展贯通,在巷旁形成垮落充填结构,采空侧垮落岩体抑制上覆岩层的弯曲下沉,减弱应力集中,压力变化幅度较小。研究成果在常兴煤业取得成功应用,监测结果显示在工作面后方70~80 m处,围岩变形趋于稳定,顶板没有明显离层、错位现象,巷旁垮落充填体结构稳定。In response to the technical problem of gob-side entry retaining in thick-layer soft roof, the technology of backfilling in thick-layer soft roof in gob-side entry retaining by pre-splitting has been proposed, and a coordinated control method for surrounding rock of retaining road along the goaf of "pressure relief in the fault top + roadside falling rock" has been established. The numerical model has been constructed to study the influence of the top angle and the prefabricated crack spacing on the solid coal wall supporting stress and the stability of the thick soft rock broken roof filling on the overburden deformation law. The results have shown that when the angle of the crest is 5°, the space of the rock deformation above the filling body is reduced, the shear failure zone is reduced, and the severity of the roof of the goaf is alleviated. When the pre-cut crack interval is 1 m, behind the working face, the prefabricated cracks in the roof rock layer can be expanded and penetrated in time, and a fallen filling structure is formed at the side of the roadway. Consequently, the bending and sinking of the overlying strata is suppressed by the falling rock mass on the goaf side, the stress concentration is weakened, and the pressure variation is small. The research results have been successfully applied in Changxing Coal Industry. The monitoring results have shown that 70-80 m behind the re-working surface, the surrounding rock deformation tends to be stable;the roof has no obvious separation and dislocation, and the collapsed filling structure is stable.

关 键 词：厚层软岩 沿空留巷 预制裂缝 断顶卸压 垮落充填 

分 类 号：TD353[矿业工程—矿井建设]