A Method for Partial Filling of Gobs According to the Characteristics of Roof Caving

Abstract

The invention discloses a method for conducting goaf partial filling according to roof caving characteristics. The method comprises the steps that high-strength filling strips which are perpendicular or parallel to the mining direction are arranged in a goaf according to an initial caving pace of an immediate roof of the goaf to control caving of the immediate roof; multiple rows of high-strength filling monomers with different shapes are arranged among the filling strips at intervals according to the bending deflection of the immediate roof to control deformation of the immediate roof; large-range filling is conducted on positions with special geological structures to control stress concentration points; a high-strength filling body-immediate roof structure control system is formed, and an upper overlying strata is supported by the high-strength filling body and the immediate roof; narrow filling strip goaf-side retained roadways are arranged, the roadway driving workload of the next working face is reduced, and the goaf is filled in a sealed mode. According to the method for conducting goaf partial filling according to the roof caving characteristics, filling materials are saved, and the filling cost is reduced; the filling structure bodies with different shapes are arranged on key positions, the control effect on the roof is good, and a whole-region chain reaction caused by destruction of partial filling bodies is prevented; a large amount of underground space formed through filling can be reused.

Description

technical field

[0001] The invention relates to a method for partial filling of a goaf according to roof caving characteristics, and belongs to the field of filling and mining. Background technique

[0002] For a long time, my country has generally adopted the caving method to deal with goafs of underground mineral resources. This method has a high degree of mechanization and mining efficiency, but it also causes large-scale deformation and collapse of the overlying strata, causing water seepage in roof cracks and damage to groundwater systems. Environmental and safety issues such as surface subsidence and destruction of buildings (structures), accumulation of gangue on the ground, and irregular accumulation of harmful gases in goafs. At the same time, there are a large number of "three under" resources in our country. Under the current situation of resource depletion, this part of resources urgently needs to be released and utilized. The methods of controlling surface subsi...

Examples

Embodiment 1

[0036] The minable coal seam of a mine is stable, the geological structure is simple, and the Platts coefficient of the coal seam is f=2~4. The dip angle of the coal seam is 2°~10°, with an average of 4°; the thickness of the coal seam is 3.20~3.30m. The immediate roof is 3.8m thick siltstone (unidirectional tensile strength is 6.8MPa, elastic modulus is 20.8MPa), the old roof is fine sandstone (unidirectional tensile strength is 7.98MPa), 6.87m thick, respectively Carbonaceous mudstone, siltstone and conglomerate with a thickness of 0.34m, 5.17m and 5.23m.

[0037] 1. According to the calculation: the uniform load on the direct roof q=0.095MPa, the initial collapse step of the direct roof L=26.3m;

[0038] 2. Design filling strips perpendicular to the mining direction with a spacing of L 1 =25m, evenly arrange the filling cells between the filling strips;

[0039] 3. Select the gangue-fly ash paste filling material, the proportion is 285kg / m3 for fine gangue 3 , the amount ...

Embodiment 2

[0043] The minable coal seam of a mine is stable, the geological structure is simple, and the Platts coefficient of the coal seam is f=2~4. The dip angle of the coal seam is 2°~10°, with an average of 4°; the thickness of the coal seam is 3.20~3.30m. The immediate roof is 3.8m thick siltstone (unidirectional tensile strength is 6.8MPa, elastic modulus is 20.8MPa), the old roof is fine sandstone (unidirectional tensile strength is 7.98MPa), 6.87m thick, respectively Carbonaceous mudstone, siltstone and conglomerate with thickness of 0.34m, 5.17m and 5.23m.

[0044] 1. According to the calculation: the uniform load on the direct roof q=0.095MPa, the initial collapse step of the direct roof L=26.3m;

[0045] 2. Design filling strips parallel to the mining direction, with a spacing of 25m, and evenly arrange filling monomers between the filling strips;

[0046] 3. Choose gangue-waste concrete paste filling material, the ratio is: 0-5mm fine gangue and 10-15mm coarse gangue are b...

Embodiment 3

[0050] The immediate roof of the No. 3 coal seam mined in a coal mine is light gray sandy mudstone and fine-grained sandstone (including two layers of thin coal, with an average thickness of 0.5m), dense massive structure, with an average thickness of 4.40m, mainly in layers, The fractures are not well developed, the compressive strength is 30.3-75.9MPa, with an average of 65.3MPa, and the tensile strength is 1.5MPa.

[0051] 1. According to the calculation of the uniform load q=0.946MPa on the direct roof, the initial collapse step distance of the direct roof is L=22m;

[0052] 2. Due to the low strength of the direct roof, two-way filling strips parallel and perpendicular to the mining direction are designed, with a spacing of 22m, and filling monomers are evenly arranged between the filling strips;

[0053] 3. Select the gangue-fly ash paste filling material, the proportion is 285kg / m3 for fine gangue 3 , the content of medium and coarse gangue is 332.5kg / m 3 , the amount...

technical field

[0001] The invention relates to a method for partial filling of a goaf according to roof caving characteristics, and belongs to the field of filling and mining. Background technique

[0002] For a long time, my country has generally adopted the caving method to deal with goafs of underground mineral resources. This method has a high degree of mechanization and mining efficiency, but it also causes large-scale deformation and collapse of the overlying strata, causing water seepage in roof cracks and damage to groundwater systems. Environmental and safety issues such as surface subsidence and destruction of buildings (structures), accumulation of gangue on the ground, and irregular accumulation of harmful gases in goafs. At the same time, there are a large number of "three under" resources in our country. Under the current situation of resource depletion, this part of resources urgently needs to be released and utilized. The methods of controlling surface subsi...

Examples

Embodiment 1

[0036] The minable coal seam of a mine is stable, the geological structure is simple, and the Platts coefficient of the coal seam is f=2~4. The dip angle of the coal seam is 2°~10°, with an average of 4°; the thickness of the coal seam is 3.20~3.30m. The immediate roof is 3.8m thick siltstone (unidirectional tensile strength is 6.8MPa, elastic modulus is 20.8MPa), the old roof is fine sandstone (unidirectional tensile strength is 7.98MPa), 6.87m thick, respectively Carbonaceous mudstone, siltstone and conglomerate with a thickness of 0.34m, 5.17m and 5.23m.

[0037] 1. According to the calculation: the uniform load on the direct roof q=0.095MPa, the initial collapse step of the direct roof L=26.3m;

[0038] 2. Design filling strips perpendicular to the mining direction with a spacing of L 1 =25m, evenly arrange the filling cells between the filling strips;

[0039] 3. Select the gangue-fly ash paste filling material, the proportion is 285kg / m3 for fine gangue 3 , the amount ...

Embodiment 2

[0043] The minable coal seam of a mine is stable, the geological structure is simple, and the Platts coefficient of the coal seam is f=2~4. The dip angle of the coal seam is 2°~10°, with an average of 4°; the thickness of the coal seam is 3.20~3.30m. The immediate roof is 3.8m thick siltstone (unidirectional tensile strength is 6.8MPa, elastic modulus is 20.8MPa), the old roof is fine sandstone (unidirectional tensile strength is 7.98MPa), 6.87m thick, respectively Carbonaceous mudstone, siltstone and conglomerate with thickness of 0.34m, 5.17m and 5.23m.

[0044] 1. According to the calculation: the uniform load on the direct roof q=0.095MPa, the initial collapse step of the direct roof L=26.3m;

[0045] 2. Design filling strips parallel to the mining direction, with a spacing of 25m, and evenly arrange filling monomers between the filling strips;

[0046] 3. Choose gangue-waste concrete paste filling material, the ratio is: 0-5mm fine gangue and 10-15mm coarse gangue are b...

Embodiment 3

[0050] The immediate roof of the No. 3 coal seam mined in a coal mine is light gray sandy mudstone and fine-grained sandstone (including two layers of thin coal, with an average thickness of 0.5m), dense massive structure, with an average thickness of 4.40m, mainly in layers, The fractures are not well developed, the compressive strength is 30.3-75.9MPa, with an average of 65.3MPa, and the tensile strength is 1.5MPa.

[0051] 1. According to the calculation of the uniform load q=0.946MPa on the direct roof, the initial collapse step distance of the direct roof is L=22m;

[0052] 2. Due to the low strength of the direct roof, two-way filling strips parallel and perpendicular to the mining direction are designed, with a spacing of 22m, and filling monomers are evenly arranged between the filling strips;

[0053] 3. Select the gangue-fly ash paste filling material, the proportion is 285kg / m3 for fine gangue 3 , the content of medium and coarse gangue is 332.5kg / m 3 , the amount...

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