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CN-116220795-B - Filling bag, filling-while-taking partition wall and construction method

CN116220795BCN 116220795 BCN116220795 BCN 116220795BCN-116220795-B

Abstract

The invention provides a filling bag which comprises a first isolation section and a second isolation section which are adjacently connected, wherein a first grouting space and a second grouting space are respectively and correspondingly arranged in the first isolation section and the second isolation section, and the first grouting space is communicated with the second grouting space; Wherein q 1 is the dead weight load of the whole rock stratum, I i is the moment of inertia of the ith rock stratum, B is the width of the cross section of the beam, namely the width of the filling bag, which can be regarded as the width of the filling bag, E i is the elastic modulus of the ith rock stratum, and h i is the thickness of the ith rock stratum.

Inventors

  • WANG HAIJUN
  • SUN SIQING
  • YANG JIANCHAO
  • CHEN CHONGFENG
  • JIA LILONG

Assignees

  • 中煤科工西安研究院(集团)有限公司

Dates

Publication Date
20260508
Application Date
20230320

Claims (8)

  1. 1. The filling bag is characterized by comprising a first isolation section and a second isolation section which are adjacently connected, wherein a first grouting space and a second grouting space are respectively and correspondingly arranged in the first isolation section and the second isolation section, and the first grouting space is communicated with the second grouting space; setting the rock stratum of the stope overlying rock as m, and synchronously deforming n layers from bottom to top, wherein n is less than or equal to m, and the elastic modulus of each rock stratum is Thickness of is The volume force is The width B of the filling bag and the pressure F to which the filling bag is subjected are calculated according to the following formula: (1) (2) (3) (4) Wherein, the Is directly propped against the dead weight load of all rock formations; moment of inertia for the ith formation; The width of the cross section of the beam can be regarded as the width of the filling bag; is the elastic modulus of the ith formation, For the thickness of the ith formation, A volumetric force for an i-th layer of rock formation, wherein i = 1,2, 3. Representing a width of The height is Wherein, the filler strength of the steel sheet is equal to or higher than the filler strength of the steel sheet, And (3) with The values of the two are equal to each other, Is the uniaxial compressive strength of the rock formation i.e. the compressive strength of the retaining wall material, In order to fill the bag under the pressure exerted by the bag, For the width of the panel, For the height of the panel, The filling bag is embedded into the included angles at two sides of the goaf; The first isolation section comprises a first grouting space formed by a first plate (101) and a second plate (102) which are oppositely arranged, air outlet holes (3) are correspondingly formed in one sides of the first plate (101) and the second plate (102) far away from the second isolation section, injection holes (2) are formed in the first plate (101) or the second plate (102), and one sides of the first plate (101) and the second plate (102) far away from the second isolation section are connected through a first connecting piece; the second isolation section comprises a third plate (103), a fourth plate (104) and a fifth plate (105), one end of the third plate (103) and one end of the fourth plate (104) are respectively arranged at two ends of the fifth plate (105) and are connected with the fifth plate, the other ends of the third plate and the fourth plate are respectively correspondingly connected with the first plate (101) and the second plate (102), and the third plate (103), the fourth plate (104) and the fifth plate (105) are enclosed to form a second grouting space.
  2. 2. The filling bag according to claim 1, wherein the first plate (101) and the second plate (102) are further provided with fixing holes (4) respectively corresponding to one side far away from the second isolation section, two ends of the first connecting piece are respectively provided in the corresponding fixing holes (4), and the first connecting piece is a steel wire rope, an iron wire or a bandage.
  3. 3. The fill bag of claim 1, wherein the third panel, the fourth panel and the fifth panel have an included angle of 30 ° to 60 °.
  4. 4. A filling-while-taking partition wall comprising a plurality of filling bags (1) according to claim 1 or 2, each filling bag (1) being arranged adjacent to each other in its length direction and being connected (5) by a second connecting element.
  5. 5. The filling-while-taking partition wall according to claim 4, wherein the second connecting member (5) is a high-strength adhesive cloth, the high-strength adhesive cloth comprises a first adhesive part and a second adhesive part, the first adhesive part is arranged on the first plate or the second plate of two adjacent filling bags, and the second adhesive part is adhered to the first adhesive part.
  6. 6. A method for constructing a filling-while-taking partition wall, characterized in that the method adopts the filling bag (1) according to claim 2 or the filling-while-taking partition wall according to claim 5.
  7. 7. The method for constructing the partition wall with filling while taking as claimed in claim 6, wherein the method comprises the following steps: Step one, covering rock strata in a stope with the layer number of m, wherein the elastic modulus of each stratum is Thickness of is The volume force is Moment of inertia of the formation Thereby utilizing the formula 1 to determine that the dead weight load of all rock strata born by the direct roof of the coal seam is When dead load and filler strength Determining the width of the filled bag using equation 2 when equal Determining the pressure born by the filling bags according to a formula 3, comparing the pressure born by the filling bags with the pressure born by the materials used by different filling bags in the process of selecting the filling bags, selecting the filling bags with corresponding sizes according to the width of a mine goaf, and sequentially placing the filling bags adjacently in the direction perpendicular to a working surface to form a partition wall; Conveying the first filling bag (1) into a filling hole (2) through a ground slurry conveying pipeline by utilizing a ground pulping system, and filling the lower part of the first filling bag with high-water material, ultrahigh-water material or paste slurry and then filling the upper part of the first filling bag with the ultrahigh-water material or paste slurry; Step three, performing numerical simulation on a roof failure rule of the coal face by using FLAC finite difference software simulation so as to determine a filling step distance, repeating the step one and the step two in a certain filling step distance, and sequentially injecting slurry into each filling bag; Fourthly, after the filled isolation wall is solidified, drilling observation holes in different heights by utilizing a small drilling machine, wherein the diameters of the observation holes are about 10mm, determining the height of the liquid level of slurry through the observation holes, sequentially blocking the observation holes by utilizing cement columns with the same size when the slurry level exceeds the observation holes, removing a hydraulic support after the isolation wall is solidified, collapsing a direct top plate between the filled bag isolation walls, exposing a pre-cut sleeve of a horizontal well (8), providing a conveying channel for slurry filling, conveying slurry by utilizing the top plate horizontal well (8), and filling the space between the filled bag isolation walls; And fifthly, repeating the first step to the fourth step in the goaf along the advancing direction of the coal face (7) to finish filling the goaf.
  8. 8. The method for constructing the partition wall according to filling as set forth in claim 7, wherein in the second step, in order to ensure the formation and uniform jacking of the filling body, each time the filling is performed at a height of 200-300 mm, the filling bag (1) is checked for falling or tilting, and air in the filling bag is discharged out of the bag through the air outlet hole (3) in the filling process, and after the filling is completed, the filling hole (2) is tied firmly through a rope to prevent the slurry from overflowing.

Description

Filling bag, filling-while-taking partition wall and construction method Technical Field The invention belongs to the field of mine filling, and particularly relates to a filling bag, a filling-while-mining partition wall and a construction method. Background Along with the high-intensity exploitation of metal, nonmetal mineral products and coal resources, the problems of subsidence of the earth surface, destruction of an aquifer, water and soil loss, solid waste stacking of gangue, gas disasters, large-area caving of stope roofs, hurricane disasters and the like are caused along with the occurrence of large-area goaf, so that regional ecological disorder is caused. In order to solve a series of ecological problems generated in the mining process, the mine filling technology is developed, along with the increase of the mining intensity and the demand of resource recovery, the filling technology is rapidly advanced, the current filling technology comprises solid filling, (ultra) high water filling, paste filling and other filling technologies, and the (ultra) high water and paste filling technologies are more and more favored by the mining because of high intensity and good stability. However, in (ultra) high water and paste filling mining, because the slurry setting time is long and the initial bleeding strength is low compared with that of solid filling mining, a partition wall needs to be constructed to isolate a goaf from a mining area and prevent the slurry from flowing to the mining area, so that the partition wall plays a vital role in filling mining. The prior partition wall construction forms mainly comprise brick-structure retaining walls, wood-structure retaining walls, concrete retaining walls, steel structures and the like. The brick-wood structure retaining wall is generally used for small-section roadways, and concrete and steel structure retaining walls can be applied to construction of large-section roadway retaining walls. The prior filling retaining wall has the following defects: On one hand, the filling slurry has low bleeding speed and long setting time, and the filling slurry is in a liquid state in a goaf for a long time, so that the filling slurry needs to be constructed into a partition wall in the filling process to prevent the diffusion and overflow of the slurry, and the filling slurry is isolated by virtue of a filling hydraulic support, so that the long production time of the hydraulic support is occupied, and the comprehensive production capacity of a stope is low. In the second aspect, the goaf can not be filled in time in the mining process, so that roof collapse, tunnel ledge damage, water-bearing layer damage, gas emission, explosion and the like of the goaf are caused, and great potential safety hazards are brought to underground production of the mine, so that hydraulic support is needed to support. The existing filling bag retaining wall process in the third aspect is complex in process due to the fact that the number of the retaining walls is large, the positions are scattered, the requirement on the strength of the retaining walls is high, a large amount of manpower and material resources are consumed, and meanwhile, the filling efficiency is low. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a filling bag, a filling-while-taking partition wall and a construction method, which solve the problems of the prior art. In order to solve the technical problems, the invention adopts the following technical scheme: the filling bag comprises a first isolation section and a second isolation section which are adjacently connected, wherein a first grouting space and a second grouting space are respectively and correspondingly arranged in the first isolation section and the second isolation section, and the first grouting space is communicated with the second grouting space; Setting a stratum of overlying strata of a stope as m, and synchronously deforming from bottom to top n layers, wherein n is less than or equal to m, the elastic modulus of each stratum is E i, the thickness is h i, and the volume force is r i; Wherein q 1 is dead weight load directly bearing all rock formations, I i is moment of inertia of the ith rock formation, B is cross section width of a beam, namely width of a filling bag, and can be regarded as width of the filling bag, E i is elastic modulus of the ith rock formation, h i is thickness of the ith rock formation, R i is volume force of the ith rock formation, i=1, 2 and 3. Preferably, the first isolation wall comprises a first grouting space formed by a first plate (101) and a second plate (102) which are oppositely arranged, wherein air outlet holes (3) are correspondingly formed on one side, far away from the second isolation wall, of the first plate (101) and the second plate (102), injection holes (2) are formed in the first plate (101) or the second plate (102), and one side, far away from the second i