停采线侧村庄压煤采动覆岩隔离注浆充填钻孔布置的研究
发布时间：2018-11-19 14:41
【摘要】：停采线侧村庄压煤是指工作面仅在停采线一侧被地面村庄所压覆,采动覆岩隔离注浆充填是利用离层内注浆充填体和隔离煤柱联合控制关键层和地表下沉的一种充填开采方法。对于此类压煤的隔离注浆充填开采而言,其核心与关键是确定第1组注浆钻孔的位置,它决定注浆时机、注浆充填控制范围,以至最终的充填控制效果。由于停采线侧压煤工作面前期均采用垮落式开采,导致压煤区域上方地表产生超前下沉,使得第1组注浆钻孔布置与全工作面注浆充填时有所不同。为确定此类压煤第1组注浆钻孔的布置以及在采动过程中经受的变形规律,论文综合采用理论分析、物理模拟、现场实测等方法开展研究。理论研究表明,停采线侧注浆充填时第1组注浆钻孔布置的主要原则是注浆钻孔发挥作用后应使紧邻村庄压煤区域的主关键层块体不受后方断裂块体的回转影响,从而控制压煤区域覆岩的稳定,有效控制地表沉陷,保护地面村庄。模拟实验结果表明,第1组注浆钻孔、停采线与压煤线间距均对地表沉陷控制效果产生影响。第1组注浆钻孔布置在压煤线上方或以内时,由于注浆时机过于滞后,使得地表村庄区域无法得到有效保护;当其布置在压煤线以外时,随着钻孔与压煤线间距加大,注浆充填对村庄的减沉控制效果逐渐加强,但超过临界值(150m)时减沉效果趋于稳定。此外,由于充填浆体的支撑作用限制了注浆层位上方覆岩的移动变形,水平变形在钻孔全段出现“两头大、中间小”、拉伸和压缩变形交替出现的规律。停采线侧注浆充填钻孔布置原则已成功应用于淮北某矿7226工作面,通过将第1组注浆钻孔分别布置在压煤线以外178m、147m,成功实现了覆岩隔离注浆充填不迁村采煤,村庄区域最大变形值0.091mm/m,远小于“三下”规程规定的I级损坏临界值2 mm/m,安全采出煤量56万t,工程效果显著。
[Abstract]:Village coal compaction on the side of stop-mining line means that the face is only overlaid by the surface village on the side of stop-mining line, and the separated grouting filling of mining overburden is a filling mining method which uses the grouting filling body in the separated layer and the separated coal pillar to control the key layer and the ground surface subsidence. For the isolated grouting filling mining, the core and the key is to determine the location of the first group of grouting holes, which determines the grouting timing, grouting filling control range, and even the final filling control effect. Due to the caving type mining used in the early stage of the side coal face on the stop-mining line, the ground surface above the area of coal compaction is leading to subsidence, which makes the arrangement of the first group of grouting holes different from that of the whole working face during the grouting filling. In order to determine the arrangement of the first grouted borehole and the deformation law in the mining process, this paper comprehensively adopts the methods of theoretical analysis, physical simulation, field measurement and so on. The theoretical study shows that the main principle of the first group of grouting boreholes arrangement is that the main key layer blocks adjacent to the village coal compaction area should not be affected by the rotation of the rear fault blocks after the grouting holes are put into full play during the grouting filling on the side of the stop-mining line, and the main key layer blocks next to the village coal compaction area should not be affected by the rotation of the rear fault blocks. In order to control the stability of overburden, effectively control the surface subsidence, protect the surface villages. The simulation results show that the first group of grouting boreholes and the spacing between stoppage and briquetting lines have an effect on the control effect of surface subsidence. When the first group of grouting holes are arranged above or within the coal line, because of the lag of grouting timing, the surface village area can not be effectively protected. With the increase of the distance between the borehole and the briquetting line, the anti-subsidence control effect of grouting filling is gradually strengthened, but beyond the critical value (150m), the anti-subsidence effect tends to be stable. In addition, because of the supporting action of the filling slurry, the movement and deformation of the overburden above the grouting layer are limited, and the horizontal deformation occurs in the whole section of the borehole with "two ends large and small in the middle", and the deformation of tension and compression appears alternately. The layout principle of side grouting filling holes in stop-mining line has been successfully applied to 7226 face of Huaibei Coal Mine. By placing the first group of grouting holes in 178mor 147m outside the coal line separately, it has been successfully realized that the overburden rock is separated by grouting filling without moving village coal mining. The maximum deformation value of the village area is 0.091 mm / m, which is far less than the critical value of class I damage 2 mm/m, which is stipulated in the "Sanshen" regulations. The coal produced safely is 560000 t. The engineering effect is remarkable.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.7
本文编号：2342642
[Abstract]:Village coal compaction on the side of stop-mining line means that the face is only overlaid by the surface village on the side of stop-mining line, and the separated grouting filling of mining overburden is a filling mining method which uses the grouting filling body in the separated layer and the separated coal pillar to control the key layer and the ground surface subsidence. For the isolated grouting filling mining, the core and the key is to determine the location of the first group of grouting holes, which determines the grouting timing, grouting filling control range, and even the final filling control effect. Due to the caving type mining used in the early stage of the side coal face on the stop-mining line, the ground surface above the area of coal compaction is leading to subsidence, which makes the arrangement of the first group of grouting holes different from that of the whole working face during the grouting filling. In order to determine the arrangement of the first grouted borehole and the deformation law in the mining process, this paper comprehensively adopts the methods of theoretical analysis, physical simulation, field measurement and so on. The theoretical study shows that the main principle of the first group of grouting boreholes arrangement is that the main key layer blocks adjacent to the village coal compaction area should not be affected by the rotation of the rear fault blocks after the grouting holes are put into full play during the grouting filling on the side of the stop-mining line, and the main key layer blocks next to the village coal compaction area should not be affected by the rotation of the rear fault blocks. In order to control the stability of overburden, effectively control the surface subsidence, protect the surface villages. The simulation results show that the first group of grouting boreholes and the spacing between stoppage and briquetting lines have an effect on the control effect of surface subsidence. When the first group of grouting holes are arranged above or within the coal line, because of the lag of grouting timing, the surface village area can not be effectively protected. With the increase of the distance between the borehole and the briquetting line, the anti-subsidence control effect of grouting filling is gradually strengthened, but beyond the critical value (150m), the anti-subsidence effect tends to be stable. In addition, because of the supporting action of the filling slurry, the movement and deformation of the overburden above the grouting layer are limited, and the horizontal deformation occurs in the whole section of the borehole with "two ends large and small in the middle", and the deformation of tension and compression appears alternately. The layout principle of side grouting filling holes in stop-mining line has been successfully applied to 7226 face of Huaibei Coal Mine. By placing the first group of grouting holes in 178mor 147m outside the coal line separately, it has been successfully realized that the overburden rock is separated by grouting filling without moving village coal mining. The maximum deformation value of the village area is 0.091 mm / m, which is far less than the critical value of class I damage 2 mm/m, which is stipulated in the "Sanshen" regulations. The coal produced safely is 560000 t. The engineering effect is remarkable.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.7
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