Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions

A technology of isolated grouting and partial coal pressing, which is applied to filling materials, ground mining, mining equipment, etc., can solve the problems of large filling range, large filling volume, and increased filling cost, so as to reduce the cost of grouting filling and save consumption , the effect of improving efficiency

Active Publication Date: 2015-07-15
CHINA UNIV OF MINING & TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For this kind of partial coal mining area on the cutting side, according to the technology disclosed in patent ZL201210164929.9, it is still necessary to implement overlying rock isolation grouting filling for th

Method used

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  • Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions
  • Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions
  • Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions

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Embodiment 1

[0032] Embodiment 1, take the 36 mining areas of a certain mine as example, as figure 1 and figure 2 As shown, coal pressing distance x

[0033] 1. Divide the working face and leave isolated coal pillars, divide the 36 mining area into 3 working faces, respectively 364, 366, and 368 working faces, and leave 40m isolated coal pillars between the working faces;

[0034] 2. Calculate the distance between the boundary line of the building protection coal pillar along the direction of the coal mining face and the cut eye. The ground building in mining area 36 is a village, which is located 50m outside the cutting eye of the working face, and the width of the building enclosure is 10m. 0 They are 45° and 83.8° respectively. According to the vertical section method stipulated in China's "Buildings, Water Bodies, Railways, Railways and Main Shaft Coal Pillars and Coal Mining Regulations", the position of the protected coal pillar boundary line is calculated, ...

Embodiment 2

[0040] Embodiment 2, take the 76 mining areas of a certain coal mine as an example, as image 3 and Figure 4 As shown, coal pressing distance x>full mining distance y

[0041] 1. Divide the working face and set up isolated coal pillars. Divide mining area 76 into 3 working faces, namely 766, 764 and 762 working faces, and leave 40m isolated coal pillars between the working faces;

[0042] 2. Calculate the distance between the boundary line of the building protection coal pillar along the direction of the coal mining face and the cutting hole, that is, the coal pressing distance. The ground buildings in mining area 76 are villages, which are located 10m outside the cutting eye of the coal mining face, and the width of the building enclosure is 10m. 0 They are 45° and 74.9°, respectively. According to the vertical section method stipulated in China's "Buildings, Water Bodies, Railways, Railways, and Main Shafts and Roadway Coal Pillar Retention and Coal Mining Regulations", ...

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Abstract

The invention provides an isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions. The method comprises the following steps: according to the geological information of a mine and geographical position of a village, determining distance between the boundary line of a protective coal pillar at the cut side of a working face and a cut, determining sufficient mining distance in the direction of the working face, and comparing the distance with the sufficient mining distance so as to determine an isolated grouting-filling control area for the overburden rock; drilling a plurality of inlet wells in the control area towards a coal bed direction, wherein the final hole depth of the inlet wells is 15 to 40 times higher than the coal bed mining height above the coal bed; and when the coal face is mined to 10 to 30 m away from the inlet wells, injecting coal ash slurry in abscission zones in the rock strata above the coal face through the inlet wells until the grouting-filling control area is mined in the coal face, and completing grouting-filling coal-mining at the cut side. The method is applicable to mining of cut-side local pressed coal and can reduce loss of cut-side pressed coal and improve a mining rate; and compared with a full-working face isolated grouting-filling mining method for overburden rock, the method provided by the invention has the advantages of a small filling amount, low filling cost, good control effect on surface subsidence, and capacity of realizing coal mining without village migration under cut-side pressed-coal conditions.

Description

technical field [0001] The invention relates to a method for controlling subsidence in coal mine mining, in particular to a mining method suitable for local coal-pressing and overlying rock isolation grouting filling on the cutting eye side of a building under a building without moving the village. Background technique [0002] Most of the coal mines in my country have the problem of building coal pressing to varying degrees. The mining of coal pressing under buildings has always been a major problem that plagues coal mining enterprises in my country, especially the mining of coal pressing under villages. Solving the problem of coal mining under buildings is not only an economic issue, but also a social issue, involving coal mining and agricultural production, farmers' lives, industrial-peasant relations, and other issues of social stability. In recent years, in the coal mining industry, methods such as goaf filling mining (such as gangue filling, paste filling, high-water m...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21F15/00
CPCE21C41/18
Inventor 许家林轩大洋王秉龙王晓振
Owner CHINA UNIV OF MINING & TECH
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