停采線側村莊壓煤采動覆巖隔離注漿充填鉆孔布置的研究
發(fā)布時間：2018-11-19 14:41
【摘要】：停采線側村莊壓煤是指工作面僅在停采線一側被地面村莊所壓覆,采動覆巖隔離注漿充填是利用離層內注漿充填體和隔離煤柱聯合控制關鍵層和地表下沉的一種充填開采方法。對于此類壓煤的隔離注漿充填開采而言,其核心與關鍵是確定第1組注漿鉆孔的位置,它決定注漿時機、注漿充填控制范圍,以至最終的充填控制效果。由于停采線側壓煤工作面前期均采用垮落式開采,導致壓煤區(qū)域上方地表產生超前下沉,使得第1組注漿鉆孔布置與全工作面注漿充填時有所不同。為確定此類壓煤第1組注漿鉆孔的布置以及在采動過程中經受的變形規(guī)律,論文綜合采用理論分析、物理模擬、現場實測等方法開展研究。理論研究表明,停采線側注漿充填時第1組注漿鉆孔布置的主要原則是注漿鉆孔發(fā)揮作用后應使緊鄰村莊壓煤區(qū)域的主關鍵層塊體不受后方斷裂塊體的回轉影響,從而控制壓煤區(qū)域覆巖的穩(wěn)定,有效控制地表沉陷,保護地面村莊。模擬實驗結果表明,第1組注漿鉆孔、停采線與壓煤線間距均對地表沉陷控制效果產生影響。第1組注漿鉆孔布置在壓煤線上方或以內時,由于注漿時機過于滯后,使得地表村莊區(qū)域無法得到有效保護;當其布置在壓煤線以外時,隨著鉆孔與壓煤線間距加大,注漿充填對村莊的減沉控制效果逐漸加強,但超過臨界值(150m)時減沉效果趨于穩(wěn)定。此外,由于充填漿體的支撐作用限制了注漿層位上方覆巖的移動變形,水平變形在鉆孔全段出現“兩頭大、中間小”、拉伸和壓縮變形交替出現的規(guī)律。停采線側注漿充填鉆孔布置原則已成功應用于淮北某礦7226工作面,通過將第1組注漿鉆孔分別布置在壓煤線以外178m、147m,成功實現了覆巖隔離注漿充填不遷村采煤,村莊區(qū)域最大變形值0.091mm/m,遠小于“三下”規(guī)程規(guī)定的I級損壞臨界值2 mm/m,安全采出煤量56萬t,工程效果顯著。
[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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD823.7
本文編號：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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD823.7
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