CN-121976845-A - Underground grouting filling method for room and pillar goaf

CN121976845ACN 121976845 ACN121976845 ACN 121976845ACN-121976845-A

Abstract

The invention discloses a room and pillar goaf underground grouting filling method which comprises the following steps of detecting a room and pillar goaf, determining the size and azimuth angle of coal pillars, arranging a conveying roadway, a return air roadway and a cutting hole at the edge of the room and pillar goaf, defining the area adjacent to the conveying roadway, the return air roadway and the cutting hole in the room and pillar goaf as a roadway treatment area, defining the rest area as a working face treatment area, arranging a water detecting and discharging hole and a coal seam filling hole which are communicated with the roadway treatment area in a coal seam according to the size and azimuth angle of the coal pillars, arranging a roof filling hole communicated with the working face treatment area in a roof of the coal seam, grouting the roadway treatment area and the working face treatment area through the coal seam filling hole and the roof filling hole, and monitoring and analyzing grouting filling effects. The underground grouting filling method for the room and pillar goaf has the advantages of being low in land feature risk, high in filling efficiency and low in cost.

Inventors

PAN LIMING
LV HUAWEN
MA BING
LIU PENGLIANG
CHEN JINYU
LI XIANGYANG

Assignees

中煤科工开采研究院有限公司
天地科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. The underground grouting filling method for the room and pillar goaf is characterized by comprising the following steps of: detecting a room-pillar goaf (1), and determining the size and azimuth angle of a coal pillar (21); a transportation roadway (3), a return air roadway (4) and a cutting hole (6) are arranged at the edge of a room and pillar type goaf (1), the areas adjacent to the transportation roadway (3), the return air roadway (4) and the cutting hole (6) in the room and pillar type goaf (1) are defined as roadway treatment areas, and the rest areas are defined as working face treatment areas; Arranging a water detection hole (8) and a coal seam filling hole (9) which are communicated with the roadway treatment area in a coal seam (2) through at least one of a transportation roadway (3), a return air roadway (4) and a cutting hole (6) according to the size and the azimuth angle of a coal pillar (21), and arranging a roof filling hole (10) communicated with the working face treatment area in a roof of the coal seam (2); Grouting the roadway treatment area and the working face treatment area through the coal seam filling holes (9) and the roof filling holes (10) respectively; And monitoring and analyzing the grouting filling effect.
2. The room and pillar goaf underground grouting filling method as claimed in claim 1, wherein the arranging of the water detection hole (8) and the coal seam filling hole (9) which are communicated with the roadway treatment area in the coal seam (2) through at least one of the transportation roadway (3), the return air roadway (4) and the cutting hole (6) according to the size and the azimuth angle of the coal pillar (21), and arranging the roof filling hole (10) communicated with the working face treatment area in the roof of the coal seam (2) comprises: firstly, arranging the coal seam filling holes (9) and then arranging the top plate filling holes (10); grouting the roadway treatment area and the working face treatment area through the coal seam filling holes (9) and the roof filling holes (10) respectively comprises the following steps: and filling the roadway treatment area and the working face treatment area from top to bottom in sequence along the extending direction of the coal seam (2).
3. The method for filling the underground grouting of the goaf of the room and pillar type according to claim 1, wherein the monitoring and analyzing the grouting filling effect comprises the following steps: The water detecting and discharging holes (8) are used as goaf detecting holes and liquid level monitoring holes; And/or a liquid level monitoring hole communicated with the roadway treatment area is formed in the coal seam (2) through at least one of a transportation roadway (3), a return air roadway (4) and a cutting hole (6); And/or installing a pressure gauge and a flow meter at the positions of the filling drilling holes of the coal bed (2) and the grouting drilling holes of the top plate, and monitoring grouting pressure and flow; And/or periodically sampling the intensity of the filling body for measurement.
4. The room and pillar goaf underground grouting filling method according to claim 1, wherein the extending direction of the coal seam (2) is angled to the horizontal direction, the plurality of coal seam filling holes (9) are provided, the tail ends of the charging holes of the coal seam (2) are adjacent to or are positioned on the top plate of the roadway treatment area, and at least part of the coal seam filling holes (9) are arranged at intervals along the extending direction of the coal seam (2); The extending direction of the coal bed (2) is angled with the horizontal direction, the top plate filling holes (10) are multiple and are provided with a plurality of slurry outlets communicated with the working surface treatment area, and at least part of the slurry outlets are distributed at intervals along the extending direction of the coal bed (2).
5. The room and pillar goaf underground grouting filling method as claimed in claim 1, wherein the roof filling hole (10) comprises directional drilling holes and branch holes which are communicated with each other, the directional drilling holes are positioned above the room and pillar goaf (1), the branch holes are multiple and are distributed at intervals along the extending direction of the directional drilling holes, and the branch holes are communicated with the working face treatment area.
6. The method for grouting filling under a room and pillar goaf according to claim 5, wherein the distance between the directional drilling and the room and pillar goaf (1) is 8m-20m.
7. The method according to claim 5, wherein a plurality of the branch holes are sequentially formed in a direction gradually away from the end of the directional drilling hole, and the filling of the area corresponding to the previous branch hole in the working face treatment area is completed before the subsequent construction of the branch hole; and/or, the top plate filling hole (10) comprises at least two mutually parallel directional drilling holes which are arranged at intervals along the height direction, and at least two groups of branch holes corresponding to the directional drilling holes are sequentially and alternately arranged along the extending direction of the directional drilling holes.
8. The room and pillar goaf underground grouting filling method as claimed in any one of claims 1-7, wherein the room and pillar goafs (1) are at least two and are arranged at intervals along a first direction, each room and pillar goaf (1) is correspondingly provided with a conveying roadway (3), a return air roadway (4) and a cutting hole (6), and a connecting roadway (5) for communicating the conveying roadway (3) corresponding to one room and pillar goaf (1) and the return air roadway (4) corresponding to the adjacent room and pillar goaf (1) is arranged between the conveying roadway (3) corresponding to one room and pillar goaf and the return air roadway (4) corresponding to the adjacent room and pillar goaf.
9. The room and pillar goaf underground grouting filling method according to any one of claims 1 to 7, wherein the cementing slurry injected into the tunnel treatment area and the working face treatment area comprises a gangue paste material formed by gangue and ordinary portland cement, wherein the maximum particle size of the gangue is not more than 10mm, the proportion of the portion with the particle size of 3mm or less is not less than 80%, and the slump of the gangue paste is 180mm to 220mm.
10. The method for grouting and filling underground in a room and pillar type goaf according to claim 9, wherein the strength of a filling body formed after the gel slurry in the tunnel treatment area is solidified is more than or equal to 8MPa, and the strength of the filling body formed after the gel slurry in the working face treatment area is solidified is more than or equal to 2MPa; And/or the cementing slurry in the roadway treatment area comprises gangue, ordinary portland cement, a water reducer, an accelerator and water, wherein the percentages of the gangue, the ordinary portland cement, the water reducer, the accelerator and the water are respectively 0.5-0.55, 0.2-0.25, 0.005-0.0055, 0.01-0.02 and 0.22-0.225, or the cementing slurry in the roadway treatment area comprises the gangue, the ordinary portland cement, the water reducer, the accelerator, the water and the fly ash, and the percentages of the gangue, the ordinary portland cement, the water reducer, the accelerator, the water and the fly ash are respectively 0.5-0.55, 0.15-0.22, 0.005-0.0055, 0.01-0.02, 0.22-0.225 and 0.02-0.025.

Description

Underground grouting filling method for room and pillar goaf Technical Field The invention relates to the technical field of coal mine filling, in particular to a room and pillar goaf underground grouting filling method. Background According to different filling drill hole arrangement positions, the room and column type goaf filling treatment technology can be divided into ground filling technology and underground filling technology, and according to different filling materials, room and column type goaf grouting filling can be divided into gangue grouting filling, fly ash grouting filling and gangue fly ash grouting filling. The underground grouting filling technology of the room and pillar goaf in the related technology has the defects of large land symptom risk, low filling efficiency and high filling cost. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a room and pillar type goaf underground grouting filling method, which has the advantages of low land symptom risk, high filling efficiency and low cost. The underground grouting filling method for the room and pillar goaf provided by the embodiment of the invention comprises the following steps: detecting a room-pillar goaf, and determining the size and azimuth angle of a coal pillar; A transportation roadway, a return air roadway and a cut-hole are arranged at the edge of the room and pillar type goaf, the area adjacent to the transportation roadway, the return air roadway and the cut-hole in the room and pillar type goaf is defined as a roadway treatment area, and the rest areas are defined as working face treatment areas; Arranging a water detection hole and a coal seam filling hole which are communicated with the roadway treatment area in a coal seam through at least one of a transportation roadway, a return air roadway and a cutting hole according to the size and the azimuth angle of a coal pillar, and arranging a roof filling hole which is communicated with the working face treatment area in a roof of the coal seam; Grouting the roadway treatment area and the working face treatment area through the coal seam filling holes and the roof filling holes respectively; And monitoring and analyzing the grouting filling effect. According to the room and pillar goaf underground grouting filling method, the room and pillar goaf is divided into the roadway treatment area adjacent to the conveying roadway, the return air roadway and the cutting hole and the working face treatment area far away from the conveying roadway, the return air roadway and the cutting hole, the roadway treatment area is communicated with the coal seam filling holes in the coal seam, the working face treatment area is communicated with the roof filling holes in the roof of the coal seam, and at the moment, the distance between the coal seam filling holes can be set shorter, and the drilling cost is lower. On this basis, can realize the slip casting filling operation to tunnel treatment district and working face treatment district respectively through coal seam filling hole and roof filling hole in at least one in transportation lane, return air lane and the cut, fill efficiently, and ground only need set up slip casting station and supporting facility basically this moment can, and just run out can demolish, and the land risk of sign is low. In some embodiments, the disposing a water detection hole and a coal seam filling hole in communication with the roadway treatment area in the coal seam through at least one of a transportation roadway, a return air roadway and a cut-out according to the size and azimuth angle of the coal pillar, and disposing a roof filling hole in communication with the working face treatment area in a roof of the coal seam comprises: firstly, setting the coal seam filling holes, and then setting the top plate filling holes; Grouting the roadway treatment area and the working face treatment area through the coal seam filling holes and the roof filling holes respectively comprises the following steps: And filling the roadway treatment area and the working face treatment area from top to bottom in sequence along the extending direction of the coal seam. In some embodiments, the monitoring and analyzing the grouting filling effect comprises: The water detection holes are used as goaf detection holes and liquid level monitoring holes; And/or a liquid level monitoring hole communicated with the roadway treatment area is arranged in the coal seam through at least one of a transportation roadway, a return air roadway and a cut hole; And/or installing a pressure gauge and a flow meter at the positions of the coal seam filling drilling hole and the roof grouting drilling hole pipeline, and monitoring grouting pressure and flow; And/or periodically sampling the intensity of the filling body for measurement. In some embodiments, the extend