Water source prediction method and water quantity control method for coal mine underground reservoir

Abstract

The application provides a water source prediction method and a water quantity control method for a coal mine underground reservoir. The water source prediction method comprises the following steps: determining the depth and thickness of the aquifer in a target mining area and the buried depth and mining height of the coal seam; judging whether a curved subsidence zone is included in the overburden rock; based on the judgment result, determining the development height of each water conducting zone according to the mining height of the coal seam and the properties of the overburden rock, wherein the water conducting zone comprises a caving zone and a fissure zone; based on the judgment result, determining the type of the aquifer included in the overburden rock according to the buried depth and mining height of the coal seam, the development height of each water conducting zone and the depth and thickness of the aquifer in the target mining area, and taking at least one type of aquifer included in the overburden rock as the water storage source of the coal mine underground reservoir. The aquifer is conceptualized into three types of lower aquifer, middle aquifer and upper aquifer, so that the water storage source of the coal mine underground reservoir is determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water source prediction and water quantity control of coal mine underground reservoir, and particularly relates to a water source prediction method and a water quantity control method of coal mine underground reservoir. BACKGROUND

[0002] More than 30 coal mine underground reservoirs have been built in Shendong mining area, which has made important contribution to the protection and utilization of water resources in the mining area.

[0003] Shendong mining area is the largest mining area in China in terms of output, and is also the largest mining area in the world in terms of building coal mine underground reservoir based on goaf. The annual water storage capacity of the underground reservoir is more than 32 million m 3 , which has made great contribution to domestic water and industrial water in the mining area. The two most important factors for maintaining the underground reservoir are water source and reservoir capacity. With the increasing mining scale and mining depth of Shendong mining area, the construction of underground reservoir is also facing new problems. According to the hydrogeological conditions of the mining area, the aquifer above the coal seam is extremely rich, and is closely related to the surface ecological environment. How to predict the water source and control the water quantity of the underground reservoir under the condition of rich aquifer is a problem to be solved. SUMMARY

[0004] The main purpose of the present application is to provide a water source prediction method and a water quantity control method of coal mine underground reservoir, so as to solve the problem of water source prediction and water quantity control of coal mine underground reservoir.

[0005] In a first aspect, the present application provides a water source prediction method of coal mine underground reservoir, comprising the following steps: obtaining the spatial distribution relationship among the aquifer, the aquifuge and the coal seam in the target mining area, determining the depth and thickness of the aquifer and the buried depth and mining height of the coal seam in the target mining area according to the spatial distribution relationship; determining the thickness of the overburden rock layer according to the buried depth and mining height of the coal seam, comparing the thickness of the overburden rock layer with a preset thickness threshold, and judging whether the overburden rock layer contains a curved subsidence zone according to the comparison result; based on the judgment result, determining the development height of each water conducting zone according to the mining height of the coal seam and the properties of the overburden rock layer, wherein the water conducting zone includes a caving zone and a fissure zone; based on the judgment result, determining the type of aquifer contained in the overburden rock layer according to the buried depth and mining height of the coal seam, the development height of each water conducting zone and the depth and thickness of the aquifer in the target mining area, and taking at least one type of aquifer contained in the overburden rock layer as the water storage source of the coal mine underground reservoir.

[0006] In one embodiment, obtaining the spatial distribution relationship among the aquifer, the aquifuge and the coal seam in the target mining area comprises: obtaining the spatial distribution relationship among the aquifer, the aquifuge and the coal seam in the target mining area by drilling or geophysical prospecting.

[0007] In one embodiment, judging whether the overburden strata contain the curved subsidence zone according to the comparison result comprises: when the thickness of the overburden strata is less than the preset thickness threshold, it is determined that the overburden strata do not contain the curved subsidence zone; and when the thickness of the overburden strata is greater than or equal to the preset thickness threshold, it is determined that the overburden strata contain the curved subsidence zone.

[0008] In one embodiment, determining the type of the aquifer contained in the overburden strata according to the buried depth and the mining height of the coal seam, the development height of each water-conducting zone, and the depth and thickness of the aquifer in the target mining area based on the judging result comprises: when it is determined that the overburden strata contain the curved subsidence zone, determining the development height of the curved subsidence zone according to the buried depth and the mining height of the coal seam and the development height of each water-conducting zone; determining a first relative positional relationship between the aquifer and each water-conducting zone and the curved subsidence zone according to the buried depth and the mining height of the coal seam, the development height of each water-conducting zone, the development height of the curved subsidence zone, and the depth and thickness of the aquifer in the target mining area; and determining the type of the aquifer contained in the overburden strata according to the first relative positional relationship.

[0009] In one embodiment, determining the type of the aquifer contained in the overburden strata according to the first relative positional relationship comprises: when the aquifer is located between the caving zone and the fractured zone, the aquifer is a lower aquifer; when the aquifer is located between the curved subsidence zone and the fractured zone, the aquifer is a middle aquifer; and when the aquifer is located above the curved subsidence zone, the aquifer is an upper aquifer.

[0010] In one embodiment, determining the type of the aquifer contained in the overburden strata according to the buried depth and the mining height of the coal seam, the development height of each water-conducting zone, and the depth and thickness of the aquifer in the target mining area based on the judging result comprises: when it is determined that the overburden strata do not contain the curved subsidence zone, determining a second relative positional relationship between the aquifer and each water-conducting zone according to the buried depth and the mining height of the coal seam, the development height of each water-conducting zone, and the depth and thickness of the aquifer in the target mining area; and determining the type of the aquifer contained in the overburden strata according to the second relative positional relationship.

[0011] In one embodiment, determining the type of the aquifer contained in the overburden strata according to the second relative positional relationship comprises: when the aquifer is located between the caving zone and the fractured zone, the aquifer is a lower aquifer; and when the aquifer is located above the fractured zone, the aquifer is an upper aquifer.

[0012] In a second aspect, the present application provides a water volume control method for a coal mine underground reservoir, comprising the following steps: determining the water storage source of the coal mine underground reservoir by using the water source prediction method for the coal mine underground reservoir as described above; determining the mine water inflow of a target mining area, taking the mine water inflow of the target mining area as the initial water source water volume of the target mining area; comparing the initial water source water volume of the target mining area with the reservoir capacity of the coal mine underground reservoir; and based on the water storage source of the coal mine underground reservoir, taking corresponding water volume control measures for the coal mine underground reservoir according to the comparison result.

[0013] In one embodiment, based on the water storage source of the coal mine underground reservoir, the corresponding water volume control measures for the coal mine underground reservoir are taken according to the comparison result, which includes: when the water storage source of the coal mine underground reservoir is the lower limit aquifer or the lower aquifer, and when the initial water source water volume of the target mining area is greater than the reservoir capacity of the coal mine underground reservoir, a grouting water plugging method is used to control the water volume flowing to the coal mine underground reservoir; when the water storage source of the coal mine underground reservoir is the middle aquifer or the upper aquifer, and when the initial water source water volume of the target mining area is greater than the reservoir capacity of the coal mine underground reservoir, a combination method of grouting water plugging and pipeline laying is used to control the water volume flowing to the coal mine underground reservoir, and when the initial water source water volume of the target mining area is less than or equal to the reservoir capacity of the coal mine underground reservoir, a pipeline laying method is used to control the water volume flowing to the coal mine underground reservoir; and when the water storage source of the coal mine underground reservoir is the upper limit aquifer, the pipeline laying method is used to control the water volume flowing to the coal mine underground reservoir.

[0014] In one embodiment, for the case that the water storage source of the coal mine underground reservoir includes at least two aquifers, based on the water storage source of the coal mine underground reservoir, the corresponding water volume control measures for the coal mine underground reservoir are taken according to the comparison result, which includes: when the water storage source of the coal mine underground reservoir is the lower limit aquifer and the middle aquifer, or when the water storage source of the coal mine underground reservoir is the lower aquifer and the upper aquifer, the pipeline laying method is used to control the water volume flowing to the coal mine underground reservoir; when the water storage source of the coal mine underground reservoir includes at least the upper limit aquifer, and when the initial water source water volume of the target mining area is less than the reservoir capacity of the coal mine underground reservoir, a drainage method is used to introduce the water in the upper limit aquifer into the coal mine underground reservoir to achieve the water volume control of the coal mine underground reservoir.

[0015] In a third aspect, the present application provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the water source prediction method for a coal mine underground reservoir as described above.

[0016] In a fourth aspect, the present application provides a computer device comprising a processor and a storage medium storing program code, which, when executed by the processor, implements the steps of the water source prediction method for a coal mine underground reservoir as described above.

[0017] The method of the present application is based on the mining fissure development height, and conceptualizes the aquifer into three types of lower limit aquifer, middle aquifer and upper limit aquifer. On this basis, in combination with the reservoir capacity requirement of the coal mine underground reservoir, the corresponding water quantity control method when different types of aquifer are used as the water storage source of the coal mine underground reservoir is proposed. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present application and, together with the description, serve to explain the present application, but are not intended to limit the present application unduly, and in the drawings:

[0019] Figure 1 Flow chart of the water source prediction method of the coal mine underground reservoir according to an exemplary embodiment of the present application;

[0020] Figure 2 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the lower limit aquifer according to a specific embodiment of the present application;

[0021] Figure 3 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the middle aquifer according to a specific embodiment of the present application;

[0022] Figure 4 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the upper limit aquifer according to a specific embodiment of the present application;

[0023] Figure 5 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the lower limit aquifer and the middle aquifer according to a specific embodiment of the present application;

[0024] Figure 6 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the middle aquifer and the upper limit aquifer according to a specific embodiment of the present application;

[0025] Figure 7 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the upper limit aquifer and the lower limit aquifer according to a specific embodiment of the present application;

[0026] Figure 8 Schematic diagram of the water quantity control of the coal mine underground reservoir when the water source of the deep buried coal seam is the upper limit aquifer, the middle aquifer and the lower limit aquifer according to a specific embodiment of the present application;

[0027] Figure 9A schematic diagram of water quantity control of a coal mine underground reservoir according to an embodiment of the present application when the water source of the coal mine underground reservoir of a shallow coal seam is a lower aquifer;

[0028] Figure 10 A schematic diagram of water quantity control of a coal mine underground reservoir according to an embodiment of the present application when the water source of the coal mine underground reservoir of a shallow coal seam is an upper aquifer;

[0029] Figure 11 A schematic diagram of water quantity control of a coal mine underground reservoir according to an embodiment of the present application when the water source of the coal mine underground reservoir of a shallow coal seam is a lower aquifer and an upper aquifer;

[0030] Figure 12 A schematic diagram of a control valve stopping a water valve according to an embodiment of the present application;

[0031] In Figures 2-12 , 1-aquifer, 2-mining area, 3-water guide pipe, 4-control valve with filter screen, 5-water stop valve. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] Embodiment one

[0034] The present embodiment provides a water source prediction method for a coal mine underground reservoir, Figure 1 A flowchart of a water source prediction method for a coal mine underground reservoir according to an exemplary embodiment of the present application. As Figure 1 shown, the water source prediction method of the present embodiment can include the following steps:

[0035] S100: Obtain the spatial distribution relationship among the aquifer, the aquifuge and the coal seam in the target mining area, and determine the depth and thickness of the aquifer and the buried depth and mining height of the coal seam in the target mining area according to the spatial distribution relationship.

[0036] The spatial distribution relationship among the aquifer, the aquifuge and the coal seam in the target mining area can be obtained by drilling or geophysical prospecting.

[0037] S200: Determine the thickness of the overburden according to the buried depth and mining height of the coal seam, compare the thickness of the overburden with a preset thickness threshold, and determine whether the overburden contains a curved subsidence zone according to the comparison result.

[0038] Specifically, the judging whether the overburden rock stratum contains the curved subsidence zone according to the comparison result comprises: when the thickness of the overburden rock stratum is less than a preset thickness threshold, it is determined that the overburden rock stratum does not contain the curved subsidence zone; and when the thickness of the overburden rock stratum is greater than or equal to the preset thickness threshold, it is determined that the overburden rock stratum contains the curved subsidence zone.

[0039] S300: determining the development height of each water conducting zone according to the mining height of the coal seam and the property of the overburden rock stratum based on the judging result, wherein the water conducting zone comprises a caving zone and a fissure zone.

[0040] Specifically, the development height of the caving zone in the overburden rock stratum can be determined by using the following expression:

[0041]

[0042] wherein ∑h represents the development height of the caving zone, M represents the mining height of the coal seam, K p represents the rock stratum dilatancy coefficient of the caving zone.

[0043] Specifically, when it is determined that the overburden rock stratum contains the curved subsidence zone, the development height of the fissure zone in the overburden rock stratum can be determined by using the expression shown in Table 1. In the expression of Table 1, H Li represents the fissure development height, and M represents the mining height of the coal seam.

[0044] Table 1: calculation expression of fissure development height of deep buried coal seam

[0045]

[0046] When it is determined that the overburden rock stratum does not contain the curved subsidence zone, the development height of the fissure zone in the overburden rock stratum can be determined by using the expression shown in Table 2. In the expression of Table 2, H Li represents the fissure development height, and M represents the mining height of the coal seam.

[0047] Table 2: calculation formula of fissure development height of shallow buried coal seam

[0048]

[0049] S400: determining the type of aquifer contained in the overburden rock stratum according to the buried depth and mining height of the coal seam, the development height of each water conducting zone, and the depth and thickness of the aquifer in the target mining area based on the judging result, and taking at least one type of aquifer contained in the overburden rock stratum as the water storage source of the coal mine underground reservoir.

[0050] When it is determined that the overburden strata contain a bending subsidence zone, the development height of the bending subsidence zone is determined according to the buried depth and mining height of the coal seam and the development height of each water-conducting zone; the first relative positional relationship between the aquifer and each water-conducting zone and the bending subsidence zone is determined according to the buried depth and mining height of the coal seam, the development height of each water-conducting zone, the development height of the bending subsidence zone, and the depth and thickness of the aquifer in the target mining area; and the type of the aquifer contained in the overburden strata is determined according to the first relative positional relationship.

[0051] Specifically, determining the type of the aquifer contained in the overburden strata according to the first relative positional relationship can include: when the aquifer is located between the caving zone and the fracture zone, the aquifer is a lower aquifer; when the aquifer is located between the bending subsidence zone and the fracture zone, the aquifer is a middle aquifer; and when the aquifer is located above the bending subsidence zone, the aquifer is an upper aquifer.

[0052] When it is determined that the overburden strata do not contain a bending subsidence zone, the second relative positional relationship between the aquifer and each water-conducting zone is determined according to the buried depth and mining height of the coal seam, the development height of each water-conducting zone, and the depth and thickness of the aquifer in the target mining area; and the type of the aquifer contained in the overburden strata is determined according to the second relative positional relationship.

[0053] Specifically, determining the type of the aquifer contained in the overburden strata according to the second relative positional relationship can include: when the aquifer is located between the caving zone and the fracture zone, the aquifer is a lower aquifer; and when the aquifer is located above the fracture zone, the aquifer is an upper aquifer.

[0054] The method of the embodiment conceptualizes the aquifer into three types of lower aquifer, middle aquifer and upper aquifer according to the relative positional relationship between the aquifer and the fracture development height based on the mining-induced fracture development height, thereby determining the water storage source of the coal mine underground reservoir.

[0055] Embodiment Two

[0056] The embodiment provides a water quantity control method for a coal mine underground reservoir, and the method of the embodiment can include the following steps:

[0057] Firstly, the water storage source of the coal mine underground reservoir is determined by using the water source prediction method for a coal mine underground reservoir as described above.

[0058] Secondly, the mine water inflow of the target mining area is determined, and the mine water inflow of the target mining area is taken as the initial water source water quantity of the target mining area.

[0059] Specifically, the mine water inflow of the target mining area can be determined according to monitoring data, or the mine water inflow of the target mining area can be determined according to historical water inflow data.

[0060] As a specific example, the mine inflow of a target mining area can be determined using the following expression:

[0061] (1) Mine maximum inflow budget

[0062] The maximum inflow is budgeted using the “caving method”. The expression is: Qmax = a (2kt + L) (2kt + B) M μ / t, where Qmax represents the maximum inflow, a represents the bedrock influence coefficient, k represents the permeability coefficient, L represents the periodic caving step distance of the mining face, B represents the caving length along the inclined direction of the mining face, M represents the total thickness of the loose layer and sandstone aquifer, μ represents the specific yield, and t represents the maximum inflow time.

[0063] (2) Mine normal inflow budget

[0064] First, calculate the atmospheric precipitation infiltration.

[0065] The water inflow into the mine is calculated using the “atmospheric precipitation infiltration method”. The expression is: Q 正常1 = S * h * a / (365 * 24), where S represents the panel goaf area, h represents the multi-year average precipitation, and a represents the infiltration coefficient.

[0066] Second, calculate the overlying bedrock inflow of the coal seam.

[0067] The “large well method” is used to budget the inflow, and the expression is:

[0068]

[0069] Where Q 正常2 represents the overlying bedrock inflow, K represents the permeability coefficient, M represents the aquifer thickness, S represents the water level drawdown value, r represents the reference radius, and R represents the influence radius.

[0070] Finally, the mine inflow is the sum of the atmospheric precipitation infiltration and the overlying bedrock inflow of the coal seam.

[0071] Third, compare the initial water source inflow of the target mining area with the storage capacity of the coal mine underground reservoir.

[0072] Fourth, based on the water storage source of the coal mine underground reservoir, according to the comparison result, take appropriate water inflow control measures for the coal mine underground reservoir.

[0073] Specifically, for the case where the water storage source of the coal mine underground reservoir is a single aquifer:

[0074] 1. When the water storage source of the coal mine underground reservoir is the lower limit aquifer or the lower aquifer, and when the initial water source inflow of the target mining area is greater than the storage capacity of the coal mine underground reservoir, the grouting water plugging method is used to control the water inflow to the coal mine underground reservoir.

[0075] 2. When the water storage source of the coal mine underground reservoir is the middle aquifer or the upper aquifer, and when the initial water source water quantity of the target mining area is greater than the storage capacity of the coal mine underground reservoir, the method of combining grouting and laying pipes is used to control the water quantity flowing to the coal mine underground reservoir; when the initial water source water quantity of the target mining area is less than or equal to the storage capacity of the coal mine underground reservoir, the method of laying pipes is used to control the water quantity flowing to the coal mine underground reservoir.

[0076] 3. When the water storage source of the coal mine underground reservoir is the upper limit aquifer, the method of laying pipes is used to control the water quantity flowing to the coal mine underground reservoir.

[0077] In view of the case that the water storage source of the coal mine underground reservoir includes at least two aquifers:

[0078] 1. When the water storage source of the coal mine underground reservoir is the lower limit aquifer and the middle aquifer, or when the water storage source of the coal mine underground reservoir is the lower aquifer and the upper aquifer, the method of laying pipes is used to control the water quantity flowing to the coal mine underground reservoir.

[0079] 2. When the water storage source of the coal mine underground reservoir includes at least the upper limit aquifer, and when the initial water source water quantity of the target mining area is less than the storage capacity of the coal mine underground reservoir, the method of drainage is used to introduce the water in the upper limit aquifer into the coal mine underground reservoir to realize the water quantity control of the coal mine underground reservoir.

[0080] The method of the embodiment determines the water storage source of the coal mine underground reservoir, predicts the initial water source water quantity of the target mining area, combines the storage capacity requirement of the coal mine underground reservoir, and proposes the corresponding water quantity control method when different types of aquifers are used as the water storage source of the coal mine underground reservoir, so as to realize the water quantity control of the coal mine underground reservoir.

[0081] Embodiment three

[0082] The embodiment provides a water source prediction and water quantity control method of a coal mine underground reservoir, which provides a reference basis for the protection and utilization of coal mine underground water and the construction of the coal mine underground reservoir under the rich water condition in China.

[0083] Firstly, the embodiment provides a method for classifying aquifers, and the specific classification method is as follows:

[0084] According to the depth of the coal seam, the definition of the aquifer in the embodiment is divided into two cases:

[0085] Case a:

[0086] For deep buried coal seam, according to the crack development law, the overburden strata can form three zones after coal mining, namely, caving zone, crack zone and bending subsidence zone. According to the relative position relationship between the water-bearing layer and the three zones, the water-bearing layer can be generalized into three categories:

[0087] Category I: the water-bearing layer is located between the caving zone and the crack zone, defined as the lower water-bearing layer;

[0088] Category II: the water-bearing layer is located between the bending subsidence zone and the crack zone, defined as the middle water-bearing layer;

[0089] Category III: the water-bearing layer is located above the bending subsidence zone, defined as the upper water-bearing layer.

[0090] Case b:

[0091] For shallow buried coal seam, according to the crack development law, the bending subsidence zone in the overburden strata is missing after coal mining, only caving zone and crack zone exist, so there are only two categories of water-bearing layers in the overburden strata:

[0092] Category I: the water-bearing layer is located between the caving zone and the crack zone, defined as the lower water-bearing layer;

[0093] Category II: the water-bearing layer is located above the crack zone, defined as the upper water-bearing layer.

[0094] The water source prediction method and the water quantity control method of the coal mine underground reservoir of the embodiment are implemented according to the following steps:

[0095] Step one: through exploration means such as drilling and geophysical prospecting, the spatial distribution relationship among the water-bearing layer, the aquiclude and the coal seam in the mining area is clarified, the distribution position and thickness of the water-bearing layer are proved, and the depth and mining height of the coal seam in the mining area are clarified.

[0096] Step two: according to the depth and mining height of the coal seam, the thickness of the overburden strata is determined, the thickness of the overburden strata is compared with the preset thickness threshold, and whether the bending subsidence zone is contained in the overburden strata is judged according to the comparison result.

[0097] The coal seam with the thickness of the overburden strata less than the preset thickness threshold is determined as a shallow buried coal seam, and the coal seam with the thickness of the overburden strata greater than or equal to the preset thickness threshold is determined as a deep buried coal seam.

[0098] Based on the above judgment result, the development height of each water conducting zone is determined according to the mining height of the coal seam and the properties of the overburden strata, wherein the water conducting zone includes the caving zone and the crack zone;

[0099] Step three: for deep buried coal seam, the water-bearing layer is classified according to the above case a, and for shallow buried coal seam, the water-bearing layer is classified according to the above case b.

[0100] Step four: Take at least one type of aquifer in the overburden as the water source of the underground reservoir.

[0101] According to the aquifer water source generalization type, there are five cases of water sources of coal mine underground reservoirs:

[0102] a. Three single types of aquifers in the overburden, namely I, II, and III. When the aquifer is a single type, the aquifer is within the mining damage range, and the water of the coal mine underground reservoir basically comes from the aquifer.

[0103] b. Three types of aquifers in the overburden, namely I+II+III. When the aquifer is this combination, the water source of the underground reservoir is mainly the I type aquifer, followed by the II type aquifer. The II type aquifer may become a recharge aquifer for the I type aquifer, and the I type and II type aquifers may be hydraulically connected under the influence of mining fissures. The III type aquifer will not basically become the water source of the underground reservoir without being affected and having no hydraulic connection with the other two types of aquifers.

[0104] c. Two types of aquifers in the overburden, namely I+II. When the aquifer is this combination, the water of the underground reservoir is supplied by the two types of aquifers. Since the I type aquifer is in the fissure zone, its damage degree is larger than that of the II type, so the I type aquifer is the main water source of the underground reservoir, followed by the II type, and the II type aquifer provides water supply for the I type aquifer.

[0105] d. Two types of aquifers in the overburden, namely I+III. When it is this aquifer combination, the water of the underground reservoir basically comes from the I type aquifer, and since the III type aquifer is less disturbed or not disturbed, it will not become the water source of the underground reservoir.

[0106] e. Two types of aquifers in the overburden, namely II+III. When it is this aquifer combination, the water of the underground reservoir basically comes from the II type aquifer, and the water of the II type aquifer enters the underground reservoir under the influence of mining. The III type aquifer is not damaged and does not become the water source of the reservoir.

[0107] Step four: According to the historical water inflow data of the mine area, predict the mine water inflow of the mine area, and take the predicted mine water inflow of the mine area as the initial water source water quantity of the mine area.

[0108] Step five: Based on the water storage source of the coal mine underground reservoir, according to the comparison result of the initial water source water quantity of the mine area and the reservoir capacity of the coal mine underground reservoir, execute the corresponding water quantity control method.

[0109] A. For single type aquifer water source:

[0110] I type aquifer (lower limit aquifer or lower aquifer, wherein the lower limit aquifer is likeFigure 2 As shown in the figure, the lower aquifer is Figure 9 as shown in the figure):

[0111] Coal mining directly damages the Class I aquifer. According to the monitored water inflow, the initial water source size V1 of the coal mine underground reservoir can be directly predicted, and the initial water source size V1 is compared with the reservoir capacity V. When V < V1, that is, when the aquifer water inflow exceeds the design requirements of the underground reservoir capacity, the method of grouting water blocking should be adopted for control; when V > V1, that is, when the aquifer water inflow is less than the reservoir capacity design requirements, no measures are needed to control the water volume.

[0112] Class II aquifer (middle aquifer or upper aquifer, where the middle aquifer is Figure 3 as shown in the figure, the upper aquifer is Figure 10 as shown in the figure):

[0113] According to the thickness and water content of the aquifer, part of the water in the Class II aquifer flows into the underground reservoir along the mining-induced fractures. When the water inflow from the aquifer can meet the reservoir capacity requirements, it is ensured that large-area water inrush does not occur.

[0114] When the initial water source volume cannot meet the reservoir capacity requirements, methods such as underground drilling (laying pipelines) should be adopted to connect the aquifer with the underground reservoir, and valves should be set at the pipeline ends to control the water inflow.

[0115] When the water inflow from the aquifer is greater than the reservoir capacity requirements, a combined method of grouting water blocking and underground drilling (laying pipelines) should be adopted to control the water inflow.

[0116] Class III aquifer (upper limit aquifer, such as Figure 4 as shown in the figure):

[0117] This type of aquifer is less disturbed or not disturbed, and methods such as underground drilling (laying pipelines) can be used to connect the aquifer with the underground reservoir, and valves should be set at the pipeline ends to control the water inflow.

[0118] B. For the water storage sources of combined aquifers, that is, the water storage sources of the coal mine underground reservoir include two or three types of aquifers (there are four possible combinations in total).

[0119] a. The situation where the water storage source includes three types of aquifers, that is, I + II + III. As Figure 5 shown in the figure, when the aquifer is in this combination, the control is mainly focused on the Class I and Class II aquifers, and the method of underground drilling (burying pipelines) is used to control the water inflow. When the water inflow cannot meet the reservoir capacity design requirements, the Class III aquifer is then diverted.

[0120] b. The situation where the water storage source includes two types of aquifers, I + II (where the deep buried coal seam is Figure 6As shown in the figure, shallow coal seam such as Figure 11 As shown in the figure, shallow coal seam such as

[0121] c. The water storage source includes two types of water-bearing layers, such as Figure 7 As shown in the figure, shallow coal seam such as

[0122] d. The water storage source includes two types of water-bearing layers, such as Figure 8 As shown in the figure, shallow coal seam such as

[0123] The pipe used in the drilling water control in the embodiment contains a control valve with a filter screen, the valve control point is located in the roadway, and the valve water outlet is inside the coal mine underground reservoir. Figure 12 The schematic diagram of the stop valve in the control valve according to the embodiment of the present application.

[0124] The method of the embodiment can predict the water storage source of the reservoir, and make corresponding measures in time according to the water storage capacity of the reservoir to adjust the water quantity in the reservoir, so as to ensure the safe operation of the reservoir. The method of the embodiment is beneficial to determine the type of water-bearing layer before the construction of the coal mine underground reservoir in the western mining area, and determine the type of water source of the coal mine underground reservoir on this basis.

[0125] Embodiment four

[0126] The embodiment provides a storage medium, which stores a computer program. The computer program is executed by a processor to realize the steps of the water source prediction method of the coal mine underground reservoir as described above.

[0127] These computer program instructions can also be loaded into a computer or other programmable data processing device to make the computer or other programmable data processing device execute a series of operation steps to generate a computer implemented process, so that the instructions executed on the computer or other programmable device provide a process for realizing the functions specified in the flow Figure 1 The steps of the functions specified in one flow or multiple flows.

[0128] Storage media includes permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology for information storage. The information can be computer readable instructions, data structures, program modules or other data. Examples of storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0129] Embodiment five

[0130] The embodiment provides a computer device, comprising a processor and a storage medium storing program codes, the program codes are executed by the processor to realize the steps of the water source prediction method of the underground reservoir of the coal mine as described above.

[0131] In one embodiment, the computer device comprises one or more processors (CPU), input / output interfaces, network interfaces and memories.

[0132] The memory can include non-permanent memory in the computer readable medium, random access memory (RAM) and / or non-volatile memory such as read only memory (ROM) or flash memory (FLASH RAM). The memory is an example of the computer readable medium.

[0133] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. When the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations are present.

[0134] It should be understood that the terms used in this way can be interchanged as appropriate, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0135] It should be understood that the exemplary embodiments in the specification can be implemented in various forms, and should not be interpreted as being limited to the embodiments set forth herein. These embodiments are provided to make the disclosure of the present application complete and complete, and to fully convey the ideas of these exemplary embodiments to those skilled in the art, and should not be understood as limiting the application.

Claims

1. A method for controlling the water volume of an underground reservoir in a coal mine, characterized in that, Includes the following steps: Obtain the spatial distribution relationship between aquifers, aquitards and coal seams in the target mining area, and determine the depth and thickness of aquifers, as well as the burial depth and mining height of coal seams in the target mining area based on the spatial distribution relationship. The thickness of the overlying strata is determined based on the burial depth and mining height of the coal seam. The thickness of the overlying strata is compared with a preset thickness threshold. Based on the comparison results, it is determined whether the overlying strata contain a flexural subsidence zone. Based on the judgment results, the development height of each water-conducting zone is determined according to the mining height of the coal seam and the properties of the overlying strata, wherein the water-conducting zone includes the caving zone and the fracture zone; Based on the judgment results, the type of aquifer contained in the overlying strata is determined according to the coal seam burial depth and mining height, the development height of each water-conducting zone, and the depth and thickness of the aquifer within the target mining area. Specifically, when it is determined that the overlying strata contain a curved subsidence zone, the development height of the curved subsidence zone is determined according to the coal seam burial depth and mining height, and the development height of each water-conducting zone. A first relative positional relationship is determined between the aquifer and each water-conducting zone and the curved subsidence zone based on the coal seam burial depth and mining height, the development height of each water-conducting zone, the development height of the curved subsidence zone, and the depth and thickness of the aquifer within the target mining area. Based on this first relative positional relationship, the type of aquifer contained in the overlying strata is determined. When the aquifer is located in a cross-slope... When the aquifer lies between a caving zone and a fracture zone, it is considered a lower-limit aquifer; when it lies between a caving zone and a fracture zone, it is considered a middle-level aquifer; when it lies above a caving zone, it is considered an upper-level aquifer. When it is determined that the overlying strata do not contain a caving zone, a second relative positional relationship between the aquifer and each type of aquifer is determined based on the coal seam's burial depth and mining height, the development height of each type of aquifer, and the depth and thickness of the aquifer within the target mining area. Based on this second relative positional relationship, the type of aquifer contained in the overlying strata is determined. When the aquifer lies between a caving zone and a fracture zone, it is considered a lower-level aquifer; when it lies above a fracture zone, it is considered a higher-level aquifer. Using at least one type of aquifer contained in the overlying strata as the water source for underground water reservoirs in coal mines; Determine the mine water inflow of the target mining area and use it as the initial water source volume for the target mining area; Compare the initial water volume of the target mining area with the capacity of the underground water reservoir in the coal mine; Based on the water source of the coal mine underground water reservoir and the comparison results, corresponding water volume control measures are adopted. Specifically, for cases where the water source of the coal mine underground water reservoir includes a single aquifer, when the water source is a lower-limit or lower-level aquifer, and the initial water volume of the target mining area is greater than the reservoir's capacity, grouting and water blocking methods are used to control the water flow to the reservoir. When the water source is a middle or upper-level aquifer, and the initial water volume of the target mining area is greater than the reservoir's capacity, a combination of grouting and water blocking and pipeline laying is used to control the water flow. When the initial water volume of the target mining area is less than or equal to the reservoir's capacity, pipeline laying is used... The method of pipeline construction controls the flow of water to the coal mine underground water reservoir. When the water source of the coal mine underground water reservoir is the upper limit aquifer, the method of laying pipelines is used to control the flow of water to the coal mine underground water reservoir. When the water source of the coal mine underground water reservoir includes at least two aquifers, such as the lower limit aquifer and the middle aquifer, or the lower aquifer and the upper aquifer, the method of laying pipelines is used to control the flow of water to the coal mine underground water reservoir. When the water source of the coal mine underground water reservoir includes at least the upper limit aquifer, and when the initial water source volume of the target mining area is less than the capacity of the coal mine underground water reservoir, the method of diversion is used to introduce water from the upper limit aquifer into the coal mine underground water reservoir to achieve water volume control of the coal mine underground water reservoir.

2. The method for controlling the water volume of underground reservoirs in coal mines according to claim 1, characterized in that, Obtain the spatial distribution relationship between aquifers, aquitards, and coal seams within the target mining area, including: The spatial distribution relationship between aquifers, aquitards and coal seams in the target mining area is obtained by drilling or geophysical exploration.

3. The method for controlling the water volume of underground reservoirs in coal mines according to claim 1, characterized in that, Based on the comparison results, determine whether the overlying strata contain a flexural subsidence zone, including: When the thickness of the overlying strata is less than the preset thickness threshold, it is determined that the overlying strata do not contain a tortuous subsidence zone. When the thickness of the overlying strata is greater than or equal to a preset thickness threshold, it is determined that the overlying strata contain a tortuous subsidence zone.

4. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the step of controlling the water volume of the underground reservoir in the coal mine as described in any one of claims 1-3.

5. A computer device comprising a processor and a storage medium storing program code, wherein when the program code is executed by the processor, it implements the steps of controlling the water volume of a coal mine underground reservoir as described in any one of claims 1-3.

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