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CN-122014334-A - Filling entry retaining method and device

CN122014334ACN 122014334 ACN122014334 ACN 122014334ACN-122014334-A

Abstract

The invention relates to the technical field of filling and retaining, and discloses a filling and retaining method and device. The filling and retaining method comprises the steps of enclosing a filling area on one side of the goaf, which is close to the gob-side entry retaining, according to a preset width, and injecting filling materials into the filling area to form a filling body for supporting a top plate of the goaf. The gob is close to the roof of gob entry side, bearing load is the biggest, the most severe subsidence and fracture deformation take place, the filling area of predetermineeing the width is established and the formation is filled in the enclosing of the one side of gob entry side of gob, the roof of gob can be stably supported, reduce the degree of roof subsidence and fracture deformation, simultaneously the filling can separate gob entry and gob, avoid the stress on gob roof to extend to gob entry, result in gob entry to take place fracture deformation by the influence of gob roof, guarantee gob entry's integrality and security, and the setting of filling area reduces filling material demand, reduce cost and consuming time, improve the mining efficiency of working face.

Inventors

  • JIANG XUEMING
  • MA GUOJUN
  • WANG JUN
  • YANG CHUNYU
  • HU CHANG
  • GUO PINGLI
  • WANG PENG
  • ZHANG NONG
  • XIE ZHENGZHENG

Assignees

  • 国家能源集团宁夏煤业有限责任公司

Dates

Publication Date
20260512
Application Date
20251230

Claims (12)

  1. 1. The filling and retaining method is characterized by comprising the following steps of: a filling area (4) is formed by surrounding one side of the goaf (2) close to the gob-side entry retaining (3) according to a preset width, and Filling material is injected into the filling area (4) to form a filling body (5) for supporting the top plate of the goaf (2).
  2. 2. The filling and gob-side entry retaining method according to claim 1, characterized in that it comprises determining the range of the preset width: The preset width is Calculated by the following formula I Is used in the range of (a), (One); Wherein, the The width of the gob-side entry retaining (3) is the width; the horizontal distance from the old roof rotation base point to the coal side; Is the roof pressure; Is the volumetric force of the direct roof; is the thickness of the coal seam; is the final strength of the filling body (5); For the initial strength of the filler (5), 1/10 of the initial strength is taken ; An elastic modulus of the filler (5); an elastic modulus which is the direct top of the filling zone (4); An elastic modulus which is the direct base of the filling zone (4); is the direct top thickness of the filling zone (4); Is the direct bottom thickness of the filling zone (4); Is a hollow top distance; The key block length is the key block length of the old top; Is the coefficient of expansion of the rock.
  3. 3. The filling and retaining method according to claim 2, characterized in that the filling and retaining method comprises the steps of To define a predetermined width within a range of (a) : A plurality of hydraulic supports (7) are arranged at intervals along the width direction of the filling area (4) at one side of the goaf (2) close to the working surface (1) so as to support a top plate at one side of the goaf (2) close to the working surface (1), The preset width of the filling area (4) is determined by the following formula II , (II) the second step; Wherein, the , Is the width of the hydraulic support (7); for the number of hydraulic supports (7), Is the average width between two adjacent hydraulic supports (7).
  4. 4. The method according to claim 3, wherein the method comprises verifying the preset width by a numerical simulation test method Is reasonable.
  5. 5. The method according to claim 4, wherein the numerical simulation verification method includes, in the numerical simulation test, according to a preset width Determining the fracture condition of the top plate of the filling area (4), and readjusting when the top plate of the filling area (4) is broken To recalculate Up to the preset width So that the top plate of the filling area (4) is not broken.
  6. 6. The filling and gob-side entry retaining method according to claim 1, characterized in that it comprises determining the strength of the filling body (5).
  7. 7. The filling roadway retention method of claim 6, wherein the method of determining the strength of the filling body (5) is: and determining the load of the roof of the gob-side entry retaining (3) according to 1-time period of compression at the initial stage of mining, wherein the 1-day strength of the filling body (5) is larger than the load of the roof of the gob-side entry retaining (3), and the filling body (5) can support the roof of the gob-side entry retaining (3) without breaking at the later stage of mining.
  8. 8. A filling and retaining device for implementing the filling and retaining method according to any one of claims 1 to 7, wherein the filling and retaining device comprises two gangue blocking brackets (6), the two gangue blocking brackets (6) are arranged at intervals on two sides of the filling area (4) along the width direction of the filling area, the filling area (4) is formed by surrounding a top plate of the goaf (2), a bottom plate of the goaf (2) and a rock stratum behind the goaf (2) together, and the front end of the filling area (4) along the mining direction is provided with an injection port for injecting filling materials.
  9. 9. The filling and gob-retaining device according to claim 8, characterized in that it further comprises a traction carriage (8), which traction carriage (8) is intended to draw the gangue blocking carriage (6) in the mining direction and/or The filling roadway retention device comprises a filling assembly, wherein the filling assembly is used for injecting the filling material into the filling area (4).
  10. 10. The filling and gob-side entry retaining device according to claim 9, characterized in that the traction support (8) is a hydraulic support and is used for supporting a roof of the goaf (2) on the side close to the working surface (1), and/or The filling assembly includes: A filling material reservoir (9), the filling material reservoir (9) being arranged on the ground and being used for storing the filling material, and -A transfer line (10), said transfer line (10) communicating said filling material reservoir (9) with said filling zone (4).
  11. 11. The filling and gob-side entry retaining device according to claim 10, characterized in that it further comprises a securing element for securing the conveying line (10) to the gob-side entry retaining device (3) and/or The filling entry retaining device further comprises a buffer piece, and the buffer piece is arranged at the bottom of the conveying pipeline (10).
  12. 12. The filling and gob-side entry retaining device according to claim 8, characterized in that the strength of the filling body (5) formed of the filling material is smaller than the strength of the rock formations of the roof and floor of the gob-side entry retaining device (3).

Description

Filling entry retaining method and device Technical Field The invention relates to the technical field of filling and retaining, in particular to a filling and retaining method and device. Background In the coal mining process, along with the pushing of the coal face, a goaf is formed behind the coal face, and the ground subsidence problem caused by the coal mining is solved through the filling mining technology. The filling mining technology is characterized in that filling materials prepared from coal mine solid wastes are input into the goaf, and the filling materials replace ores removed by mining, so that supporting force is provided for the goaf, the coal mine solid wastes can be treated, and the ground surface damage caused by ground subsidence and the like can be reduced. The existing filling mining method is to use a paste filling support to be arranged around the edge of a goaf so as to separate the goaf from a retaining roadway, and to inject paste filling materials into the goaf to prevent sinking and moving of roof strata of the goaf, and to continue mining of a working face after the paste filling materials are solidified. However, the existing filling mining method needs to completely fill the goaf with the pasty filling material, the filling material is large in demand, long in time consumption and high in cost, and mining efficiency of a working face is limited. Disclosure of Invention The invention aims to solve the problems that the existing filling mining method needs to fill a goaf with pasty filling materials completely, the filling materials are large in demand, long in time consumption and high in cost, and mining efficiency of a working face is limited, and provides a filling and retaining method and device. In order to achieve the above purpose, the invention provides a filling and retaining method, which comprises the steps of enclosing a filling area with a preset width on one side of a goaf close to a gob-side entry retaining way, and injecting filling materials into the filling area to form a filling body for supporting a roof of the goaf. In some embodiments, the filling and retaining method includes determining a range of the preset width, the preset width beingCalculated by the following formula IIs used in the range of (a), (One); Wherein, the For the edge space the width of the retaining lane; the horizontal distance from the old roof rotation base point to the coal side; Is the roof pressure; Is the volumetric force of the direct roof; is the thickness of the coal seam; is the final strength of the pack; 1/10 of the initial strength of the filler is taken ;An elastic modulus of the filler; an elastic modulus that is the direct top of the filled region; an elastic modulus that is the direct base of the filled region; A direct top thickness of the filled region; a direct bottom thickness of the fill region; Is a hollow top distance; The key block length is the key block length of the old top; Is the coefficient of expansion of the rock. In some embodiments, the filling and retaining method includes determining a preset width within the range of a aboveA plurality of hydraulic supports are arranged at intervals along the width direction of the filling area on one side of the goaf close to the working surface so as to support a top plate on one side of the goaf close to the working surface, The preset width of the filling area is determined by the following formula II, (II) the second step; Wherein, the ,Is the width of the hydraulic support; For the number of hydraulic supports to be used, Is the average width between two adjacent hydraulic supports. In some embodiments, the filling roadway retention method comprises verifying the preset width by a numerical simulation test methodIs reasonable. In some embodiments, the numerical simulation verification method includes, in the numerical simulation test, according to a preset widthDetermining the fracture condition of the top plate of the filling area, and readjusting when the top plate of the filling area is fracturedTo recalculateUp to the preset widthSo that the top plate of the filling area is not broken. In some embodiments, the filling roadway retention method includes determining a strength of the filling body. In some embodiments, the method for determining the strength of the filling body comprises the steps of determining the load of the roof of the gob-side entry retaining according to 1-time period of compression at the initial stage of mining, wherein the strength of the filling body is larger than the load of the roof of the gob-side entry retaining after 1 day, and the filling body can support the roof of the gob-side entry retaining without breaking at the later stage of mining. The invention further provides a filling and retaining device for implementing the filling and retaining method according to any one of the above schemes, wherein the filling and retaining device comprises two gangue blocki