A water-conserving coal mining method and system based on underwater height limit mining

Abstract

The present application relates to water conservation coal mining technical field, especially in kind of water conservation coal mining method and system based on underwater height limit mining, including: S100, the to-be-mined minefield is divided into n areas with equal area, the coal seam thickness, the ratio of crack mining and the coal seam buried depth of each area are obtained, the safety coal rock column protection layer thickness of each area is calculated based on the coal seam thickness, the ratio of crack mining and the coal seam buried depth of each area; n is less than or equal to 50; S200, the safety coal rock column protection layer thickness of each area is input into the pre-established network analysis model, and the area needing height limitation in the to-be-mined minefield and the mineable coal seam thickness of the area needing height limitation are obtained. It has good water conservation effect, high resource output rate and small degree of influence on production capacity.

Description

Technical Field

[0001] This invention relates to the field of water-conserving coal mining technology, and in particular to a water-conserving coal mining method and system based on underwater height-limited mining. Background Technology

[0002] The development of large-scale coal bases in arid and semi-arid regions has led to serious groundwater and ecological problems, including damage to aquifer structures, declining groundwater levels, reduced spring flow, and river interruptions. Since surface vegetation is highly dependent on shallow groundwater, coal mining must protect these resources to promote the maintenance and improvement of the ecological environment.

[0003] Water-conserving coal mining is an important component of green mining and one of the effective ways to solve the problems of coal mining, water resources, and ecological environmental protection in arid and semi-arid mining areas. Currently used water-conserving coal mining methods cannot simultaneously address the water conservation effect, resource recovery rate, and impact on production capacity.

[0004] Therefore, there is an urgent need for a water-conserving coal mining method that has good water retention, high resource output, and minimal impact on production capacity. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a water-conserving coal mining method and system based on underwater height limit mining, which has good water conservation effect, high resource output rate and small impact on production capacity.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, embodiments of the present invention provide a water-conserving coal mining method based on underwater height-limited mining, comprising:

[0010] S100. Divide the mining area into n equal areas, obtain the coal seam thickness, fracturing ratio and coal seam burial depth of each area, and calculate the thickness of the safe coal-rock pillar protective layer for each area based on the coal seam thickness, fracturing ratio and coal seam burial depth of each area; where n is less than or equal to 50.

[0011] S200. Input the thickness of the safe coal and rock pillar protective layer of each region into the pre-established network analysis model to obtain the regions in the mining field that require height restriction and the mineable coal seam thickness of the regions that require height restriction.

[0012] Optionally, the process may further include the following steps before step S100:

[0013] S000: Obtain the water mining level of each area in the mining field to be mined, and determine the type of safe coal and rock pillar in each area based on the water mining level of each area.

[0014] Optionally, in S100,

[0015] The coal seam thickness, fracture-to-mining ratio, and coal seam burial depth of each region were obtained based on the exploration data of the mining area to be mined.

[0016] Optionally, in S200,

[0017] The step of inputting the thickness of the safe coal-rock pillar protective layer in each region into the pre-established network analysis model includes:

[0018] S210. Compare the thickness of the safety coal and rock pillar protective layer in each region with the thickness of the safety coal and rock pillar protective layer that needs to be reserved to obtain the regions that need to be height-restricted.

[0019] The required thickness of the safety coal and rock pillar protective layer is determined in advance based on the geological information of the current area;

[0020] S220. Based on the thickness of the safety coal-rock pillar protective layer in the area requiring height restriction, calculate the thickness of the mineable coal seam in the area requiring height restriction.

[0021] Optionally, S210 includes:

[0022] When the thickness of the safety coal and rock pillar protective layer is less than the required preset thickness, height-restricted mining shall be carried out.

[0023] Optionally, in S100,

[0024] The thickness of the safe coal-rock pillar protective layer for each region, calculated based on the coal seam thickness, fracturing ratio, and coal seam burial depth for each region, includes:

[0025] The calculation formula is:

[0026] H 安 =H m ×(1+α×(C-1) / (C×H s ));

[0027] Among them, H 安 The thickness of the protective layer for the safe coal-rock pillar in each region;

[0028] H m For each region, the coal seam thickness is given by C, and the fracturing ratio is given by H. s For each region, the coal seam burial depth is represented by α, which indicates the influence of the fracturing ratio on the thickness of the protective layer of the safe coal-rock pillar.

[0029] Optionally, S220 includes:

[0030] According to the thickness of the safety coal and rock pillar protection layer in the area where height limit is required, the calculation formula for the thickness of the coal seam that can be mined in the area where height limit is required is:

[0031] ;

[0032] where H k is the thickness of the coal seam that can be mined, H_security is the thickness of the safety coal and rock pillar protection layer in each area, C is the crack-to-mining ratio in each area, and α is the influence degree of the crack-to-mining ratio on the thickness of the safety coal and rock pillar protection layer.

[0033] Optionally, α, the influence degree of the crack-to-mining ratio on the thickness of the safety coal and rock pillar protection layer, is an adjustment parameter, which is determined based on the on-site situation and the fitted historical data.

[0034] Optionally, S000 includes:

[0035] When the water body mining level is level I, the type of the safety coal and rock pillar is the waterproof safety coal and rock pillar;

[0036] When the water body mining level is level II, the type of the safety coal and rock pillar is the sand-proof safety coal and rock pillar;

[0037] When the water body mining level is level III, the type of the safety coal and rock pillar is the collapse-proof safety coal and rock pillar.

[0038] In a second aspect, an embodiment of the present invention provides a water-preserving coal mining system based on underwater height limit mining, including:

[0039] A calculation module, configured to divide the coalfield to be mined into n areas with equal areas, obtain the thickness of the coal seam, the crack-to-mining ratio, and the burial depth of the coal seam in each area, and calculate the thickness of the safety coal and rock pillar protection layer in each area based on the thickness of the coal seam, the crack-to-mining ratio, and the burial depth of the coal seam in each area; n is less than or equal to 50;

[0040] A network analysis module, configured to input the thickness of the safety coal and rock pillar protection layer in each area into a pre-established network analysis model, and obtain the areas where height limit is required in the coalfield to be mined and the thickness of the coal seam that can be mined in the areas where height limit is required.

[0041] (III) Beneficial effects

[0042] The beneficial effects of the present invention are as follows: For a water-preserving coal mining method and system based on underwater height limit mining according to the present invention, due to the adoption of the water-preserving coal mining method and system with underwater height limit mining, compared with the prior art, it has good water-preserving effect, high resource output rate, and small influence on production capacity. Description of the drawings <​Figure 1 This is a flowchart of a water-conserving coal mining method based on underwater height limit mining;

[0044] Figure 2 This is a schematic diagram illustrating the water body mining level classification of a water-conserving coal mining method based on underwater height limit mining. Detailed Implementation

[0045] Water-conserving coal mining: a coal mining technology that seeks the optimal solution between coal mining volume and water resource carrying capacity by controlling the movement of rock strata to maintain the stability of the structure of aquifers (rock groups) with water supply significance and ecological value or to keep water level changes within a reasonable range.

[0046] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] The present invention proposes a water-conserving coal mining method and system based on underwater height limit mining. Compared with the prior art, the water-conserving coal mining method and system based on underwater height limit mining has better water conservation effect, higher resource output rate and less impact on production capacity.

[0048] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0049] Example 1

[0050] See Figure 1 An embodiment of the present invention provides a water-conserving coal mining method based on underwater height limit mining, comprising:

[0051] Step S100: Divide the mining area into n equal areas, obtain the coal seam thickness, fracturing ratio and coal seam burial depth of each area, and calculate the thickness of the safe coal-rock pillar protective layer for each area based on the coal seam thickness, fracturing ratio and coal seam burial depth of each area; where n is less than or equal to 50.

[0052] Step S200: Input the thickness of the safe coal and rock pillar protective layer of each region into the pre-established network analysis model to obtain the regions in the mining field that require height restriction and the mineable coal seam thickness of the regions that require height restriction.

[0053] In this embodiment, before step S100, the method further includes: obtaining the water mining level of each area of ​​the mining field to be mined, and determining the type of safe coal and rock pillar in each area based on the water mining level of each area.

[0054] In this embodiment, see Figure 2 The water body mining level is divided into Level I, Level II, and Level III.

[0055] When the water body is any type of surface water directly above or below the bedrock without a stable cohesive soil aquitard, or a loose, porous, strong or medium aquitard water body directly above or below the bedrock without a stable cohesive soil aquitard, or a bedrock, strong or medium aquitard water body without a stable argillaceous rock aquitard below the bottom interface, or any type of surface water body and loose, medium-strong or medium aquitard water body above steeply inclined coal seams, or a water body that requires protection as an important water source and tourist destination, the water body mining level is Class I, and a waterproof and safe coal-rock pillar is selected.

[0056] When the water body type is a loose layer with multiple structures at the bottom, a large thickness, and weak water content, or a loose layer with strong water content in the middle and upper parts and weak water content at the bottom, or a loose layer with a stable thick cohesive soil impermeable layer at the bottom or a loose weak water content layer with strong porosity and medium water content in the middle and upper parts, or a loose layer and bedrock weak water content layer with drainage conditions, the water body mining level is Class II, and sand control safety coal and rock pillars are selected.

[0057] When the water body type is a loose layer with a stable thick clay aquifer at the bottom, a loose layer with weak pores in the upper part, or a loose layer or bedrock water body that is close to being drained, the water body mining level is Class III, and a safe coal and rock pillar for preventing collapse is selected.

[0058] In this embodiment, the coal seam thickness, fracture-to-mining ratio, and coal seam burial depth of each region are obtained based on the exploration data of the mining area to be mined.

[0059] In this embodiment, by adopting a water-conserving coal mining method with underwater height restriction, compared with the existing technology, it has better water conservation effect, higher resource output rate and less impact on production capacity.

[0060] Example 2

[0061] An embodiment of the present invention provides a water-conserving coal mining method based on underwater height-limited mining, comprising:

[0062] Step S100: Divide the mining area into n equal areas, obtain the coal seam thickness, fracturing ratio and coal seam burial depth of each area, and calculate the thickness of the safe coal-rock pillar protective layer for each area based on the coal seam thickness, fracturing ratio and coal seam burial depth of each area; where n is less than or equal to 50.

[0063] In this embodiment, for example, the mining field to be mined is divided into 10 areas of equal size. Through the exploration data of the mining field to be mined, the coal seam thickness, fracturing ratio and coal seam burial depth of each of the 10 areas are obtained.

[0064] Optionally, the calculation of the safe coal-rock pillar protective layer thickness for each region, based on the coal seam thickness, fracturing ratio, and coal seam burial depth, includes:

[0065] The calculation formula is:

[0066] H 安 =H m ×(1+α×(C-1) / (C×H s ));

[0067] Among them, H 安 The thickness of the protective layer for the safe coal-rock pillar in each region;

[0068] H m For each region, the coal seam thickness is given by C, and the fracturing ratio is given by H. s For each region, the coal seam burial depth is given, and α represents the degree of influence of the fracturing ratio on the thickness of the protective layer of the safe coal-rock pillar.

[0069] Step S200: Input the thickness of the safe coal and rock pillar protective layer of each region into the pre-established network analysis model to obtain the regions in the mining field that require height restriction and the mineable coal seam thickness of the regions that require height restriction.

[0070] In this embodiment, inputting the thickness of the safe coal-rock pillar protective layer in each region into the pre-established network analysis model includes:

[0071] Step S210: Compare the thickness of the safety coal and rock pillar protective layer in each region with the thickness of the safety coal and rock pillar protective layer that needs to be reserved to obtain the regions that need to be height-restricted;

[0072] The required thickness of the safety coal and rock pillar protective layer is determined in advance based on the geological information of the current area;

[0073] Step S220: Calculate the mineable coal seam thickness in the area requiring height restriction based on the thickness of the safety coal-rock pillar protective layer.

[0074] In this embodiment, the network analysis model is constructed based on GIS (Geographic Information System) technology, which converts geospatial data into a network model. Here, nodes represent different regions within the coalfield to be mined, and edges represent physical or logical connections between regions. The corresponding attribute of each node is set to the thickness of the safety coal and rock pillar protection layer. According to industry standards, a threshold is set for the thickness of the safety coal and rock pillar protection layer, and this threshold is the required thickness of the safety coal and rock pillar protection layer to be reserved.

[0075] When the thickness of the safety coal and rock pillar protection layer in a certain region is less than the required thickness of the safety coal and rock pillar protection layer to be reserved, height restriction is required for this region.

[0076] For the regions that require height restriction, based on the thickness of their safety coal and rock pillar protection layers, calculate the thickness of the coal seam that can be mined.

[0077] In this embodiment, a visualization tool is used to display the analysis results of the network analysis model, the regions that require height restriction, and the thickness of the coal seams in the regions that require height restriction, and an interactive interface is provided to allow users to adjust parameters and view specific information of different regions.

[0078] The calculation formula for the thickness of the coal seam that can be mined in the regions that require height restriction, based on the thickness of the safety coal and rock pillar protection layer in these regions, is as follows:

[0079] ;

[0080] where, H k is the thickness of the coal seam that can be mined, H_security is the thickness of the safety coal and rock pillar protection layer for each region, C is the mining-induced fracture ratio for each region, and α is the influence degree of the mining-induced fracture ratio on the thickness of the safety coal and rock pillar protection layer.

[0081] The α, which is the influence degree of the mining-induced fracture ratio on the thickness of the safety coal and rock pillar protection layer, is an adjustment parameter and is determined based on on-site conditions and historical data fitting.

[0082] In this embodiment, before step S100, it further includes: obtaining the water body mining movement level of each region in the coalfield to be mined, and determining the type of the safety coal and rock pillar for each region based on the water body mining movement level of each region.

[0083] In this embodiment, step S000 includes:

[0084] When the water body mining movement level is level I, the type of the safety coal and rock pillar is a waterproof safety coal and rock pillar;

[0085] When the water body mining movement level is level II, the type of the safety coal and rock pillar is a sand-proof safety coal and rock pillar;

[0086] When the water body mining movement level is level III, the type of the safety coal and rock pillar is a collapse-proof safety coal and rock pillar.

[0087] In this embodiment, for example, a certain coalfield is a coal mining area under water. The actual hydrogeological conditions are a medium-water-rich aquifer with loose pores and no stable clay water-retaining layer under the bottom interface of the water body. At this time, the water body mining level is Class I, and it is not allowed for the water-conducting fracture zone to affect the water body. It is required to leave a waterproof safety coal-rock pillar on the roof.

[0088] In this embodiment, by adopting a water-conserving coal mining method with underwater height restriction, the minefield to be mined is divided into n regions of equal area. The coal seam thickness, fracturing ratio, and coal seam burial depth of each region are obtained. Based on the coal seam thickness, fracturing ratio, and coal seam burial depth of each region, the thickness of the safe coal-rock pillar protective layer of each region is calculated. The thickness of the safe coal-rock pillar protective layer of each region is input into a pre-established network analysis model to obtain the regions in the minefield that require height restriction and the mineable coal seam thickness of the regions that require height restriction. This achieves the technical effect of good water retention, high resource output rate, and minimal impact on production capacity.

[0089] Example 3

[0090] This embodiment proposes a water-conserving coal mining system based on underwater height-limited mining, including:

[0091] The calculation module is used to divide the mining field into n equal areas, obtain the coal seam thickness, fracturing ratio and coal seam burial depth of each area, and calculate the thickness of the safe coal-rock pillar protective layer for each area based on the coal seam thickness, fracturing ratio and coal seam burial depth of each area; wherein n is less than or equal to 50.

[0092] The network analysis module is used to input the thickness of the protective layer of the safe coal and rock pillar in each region into a pre-established network analysis model to obtain the areas in the mining field that require height restrictions and the mineable coal seam thickness in the areas that require height restrictions.

[0093] This embodiment of a water-conserving coal mining system based on underwater height limit mining achieves the technical effects of good water conservation, high resource output, and minimal impact on production capacity.

[0094] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0095] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0096] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0097] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0098] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A water-preserved coal mining method based on underwater height-limited mining, characterized in that, The method comprises the following steps: S100, dividing a to-be-mined minefield into n areas with equal areas, obtaining a coal seam thickness, a mining-to-crushing ratio and a coal seam buried depth of each area, and calculating a safe coal rock pillar protection layer thickness of each area based on the coal seam thickness, the mining-to-crushing ratio and the coal seam buried depth of each area; the n is less than or equal to 50; The calculation of the safe coal rock pillar protection layer thickness of each area based on the coal seam thickness, the mining-to-crushing ratio and the coal seam buried depth of each area comprises: The calculation formula is: H 安 =H m ×(1+α×(C-1) / (C×H s )); wherein H 安 is the safety coal pillar protection layer thickness for each region; H m is the seam thickness of each region, C is the ratio of split mining of each region, H s is the seam burial depth of each region, and a is the influence degree of the ratio of split mining on the safety coal rock pillar protection layer thickness. S200, inputting the safe coal rock pillar protection layer thickness of each area into a pre-established network analysis model, and obtaining an area that needs to be limited in height in the to-be-mined minefield and a mineable coal seam thickness of the area.

2. The water-preserved coal mining method based on underwater height-limiting mining according to claim 1, characterized in that, The S100 further comprises the following steps: S000, obtaining a water body mining grade of each area of the to-be-mined minefield, and determining a type of safe coal rock pillar of each area based on the water body mining grade of each area.

3. The water-preserved coal mining method based on underwater height-limiting mining according to claim 1, characterized in that, In the S100, The coal seam thickness, the mining-to-crushing ratio and the coal seam buried depth of each area are obtained according to survey data of the to-be-mined minefield.

4. The water-preserved coal mining method based on underwater height-limiting mining according to claim 1, characterized in that, In the S200, The inputting of the safe coal rock pillar protection layer thickness of each area into the pre-established network analysis model comprises: S210, comparing the safe coal rock pillar protection layer thickness of each area with a safe coal rock pillar protection layer thickness that needs to be set, and obtaining an area that needs to be limited in height; The safe coal rock pillar protection layer thickness that needs to be set is pre-determined according to geological information of a current area; S220, calculating a mineable coal seam thickness of the area that needs to be limited in height based on the safe coal rock pillar protection layer thickness of the area.

5. The water-preserved coal mining method based on underwater height-limited mining according to claim 4, characterized in that, The S210 comprises: When the safe coal rock pillar protection layer thickness is less than the safe coal rock pillar protection layer thickness that needs to be set, limited-height mining is performed.

6. The water-preserved coal mining method based on underwater height-limiting mining according to claim 4, characterized in that, The S220 comprises: The calculation formula for the mineable coal seam thickness of the area that needs to be limited in height based on the safe coal rock pillar protection layer thickness of the area is: ； Wherein, H k is the thickness of the coal seam that can be mined, H 安 is the thickness of the safety coal rock pillar protection layer of each region, C is the ratio of each region, and a is the degree of influence of the ratio of each region on the thickness of the safety coal rock pillar protection layer.

7. The water conservation mining method based on underwater limited-height mining according to claim 1 or 6, characterized in that, The α is an influence degree of the mining-to-crushing ratio on the safe coal rock pillar protection layer thickness, is an adjustment parameter, and is determined by field conditions and fitting historical data.

8. The water conservation mining method based on underwater limited-height mining according to claim 2, characterized in that, The S000 comprises: When the water body mining grade is grade I, the type of safe coal rock pillar is a waterproof safe coal rock pillar; When the water body mining grade is grade II, the type of safe coal rock pillar is a sandproof safe coal rock pillar; When the water body mining grade is grade III, the type of safe coal rock pillar is a collapse-proof safe coal rock pillar.

9. A water-preserved coal mining system based on underwater height-limited mining, characterized in that, The method comprises the following steps: The calculation module is configured to divide a to-be-mined minefield into n areas with equal areas, obtain a coal seam thickness, a mining-to-crushing ratio and a coal seam buried depth of each area, and calculate a safe coal rock pillar protection layer thickness of each area based on the coal seam thickness, the mining-to-crushing ratio and the coal seam buried depth of each area; the n is less than or equal to 50; The calculation of the safe coal rock pillar protection layer thickness of each area based on the coal seam thickness, the mining-to-crushing ratio and the coal seam buried depth of each area comprises: The calculation formula is: H 安 =H m ×(1+α×(C-1) / (C×H s )); wherein H 安 is the safety coal pillar protection layer thickness for each region; H m is the seam thickness of each region, C is the ratio of split mining of each region, H s is the seam burial depth of each region, and a is the influence degree of the ratio of split mining on the safety coal rock pillar protection layer thickness. The network analysis module is used for inputting the safety coal rock pillar protection layer thickness of each area into a pre-established network analysis model, and obtaining the area needing height limitation in the to-be-mined minefield and the mineable coal seam thickness of the area needing height limitation.

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