CN114152566A - Shallow coal mining overburden damage degree determination method based on underground reservoir - Google Patents
Shallow coal mining overburden damage degree determination method based on underground reservoir Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 63
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- 230000035699 permeability Effects 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 13
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- 238000001764 infiltration Methods 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 10
- 239000003673 groundwater Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 230000009525 mild injury Effects 0.000 claims description 3
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Abstract
The invention discloses a shallow coal mining overburden damage degree determining method based on an underground reservoir, which comprises the following steps: determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area, acquiring surface seepage of the subsidence area, monitoring water volume change information of the underground reservoir in the subsidence area, determining water seepage strength of an overlying rock layer in the subsidence area according to the surface seepage and the water volume change information of the underground reservoir, and determining damage degree of the overlying rock layer according to the water seepage strength of the overlying rock layer. In the scheme, based on the underground reservoir system of the coal mine, the change of the water storage capacity of the underground reservoir is utilized to reflect the change of the water seepage capacity of the overlying strata above the underground reservoir, the water seepage capacity of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judgment method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of quickly and simply judging the ecological damage of the overlying strata in coal mining.
Description
Technical Field
The invention relates to the field of coal mining ecological damage detection, in particular to a shallow coal mining overburden damage degree determination method based on an underground reservoir.
Background
The damage change of the mining overburden rock is a dynamic process, continuous change information of the whole mining period is difficult to obtain by a conventional geological exploration method, a high-precision geophysical detection technology must be integrated, the surface layer and the overburden rock body are comprehensively detected to research the change rule of the mining overburden rock, and means such as satellite remote sensing, image radar, measurement and analysis are mainly adopted. The equipment required by the detection technology belongs to a high-precision instrument, and the operation difficulty and the analysis difficulty are high. The remote sensing monitoring method is higher in cost of time and money, and higher in use threshold, so that the application range is greatly limited.
Disclosure of Invention
The invention aims to solve the technical problems of high difficulty in operation and analysis of a detection instrument, high cost and low efficiency in the existing mining overburden damage judgment method, and provides a shallow coal mining overburden damage degree determination method based on an underground reservoir.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a method for determining damage degree of overlying strata in shallow coal mining based on an underground reservoir, which comprises the following steps:
determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area;
acquiring the surface seepage amount of the subsidence area;
monitoring the water quantity change information of the underground reservoir in the subsidence area;
determining the water seepage strength of an upper overlying rock layer in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir;
and determining the damage degree of the overburden according to the water seepage strength of the overburden.
In some embodiments of the present invention, the method for determining damage degree of an overlying strata for shallow coal mining based on an underground reservoir includes the steps of determining a subsidence area in a shallow coal mining area and distribution information of the underground reservoir in the subsidence area:
acquiring hydrogeological information in the shallow coal mining area;
determining a catchment area which is in water conservancy communication with an underground reservoir in the shallow coal mining area according to the hydrogeological information;
and defining the sinking area according to the catchment area.
In the method for determining damage degree of overlying strata in shallow coal mining based on an underground reservoir in some embodiments of the invention, the steps of determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area are as follows:
the underground reservoir is designed into a water storage space with a water inlet channel and a water outlet channel;
the inlet channel is provided with a sensing device for monitoring the water inflow, and the outlet channel is provided with a sensing device for monitoring the water outflow.
In the method for determining damage degree of overlying strata in shallow coal mining based on an underground reservoir in some embodiments of the invention, the steps of determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area are as follows:
the underground reservoir is provided with a liquid level sensor, and the liquid level sensor is used for monitoring liquid level height information of the underground reservoir.
In the method for determining damage degree of overlying strata in shallow coal mining based on an underground reservoir in some embodiments of the invention, the step of monitoring the water volume change information of the underground reservoir in the subsidence area comprises the following steps:
and determining the water quantity change information of the underground reservoir according to the water inflow, the water outflow, the liquid level height change and the water storage area of the underground reservoir within a set time period.
In some embodiments of the method for determining damage degree of an overlying strata during shallow coal mining based on an underground reservoir, the step of determining the water seepage strength of the overlying strata in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir comprises:
determining the seepage amount of the underground reservoir permeating into the underground reservoir through the overlying rock stratum according to the monitored water amount change information of the underground reservoir in a set time period;
obtaining the catchment amount of the surface of the overlying rock stratum according to the precipitation amount, the evaporation amount, the surface water body lateral supply amount and the watershed supply amount of the shallow coal mining area in a set time period;
determining subsurface seepage according to the hydrogeological information and the water catchment amount;
and obtaining the water seepage coefficient of the overlying strata according to the subsurface seepage and the seepage, wherein the water seepage coefficient of the overlying strata corresponds to the water seepage strength of the overlying strata.
In some embodiments of the invention, the hydrogeological information includes overburden structure information, formation permeability information, natural water-barrier distribution information, upper water-barrier distribution information, lateral replenishment information of a ground water body, and watershed replenishment information.
In some embodiments of the method for determining damage degree of an overburden during shallow coal mining based on an underground reservoir, the step of obtaining a water permeability coefficient of the overburden according to the subsurface infiltration capacity and the water infiltration capacity comprises:
obtaining the water permeability coefficient of the overburden stratum by the following steps:
K＝q/Q (1)；
q＝V(h1,t1)-V(h2,t2)-qin+qex (2)；
Q＝Qa+Qp+Ql+Qw-Qe (3)；
Qp＝Ip×(t2-t1)×S (4)；
Qe＝Ie×(t2-t1)×S (5)；
wherein K is the water permeability coefficient of the overburden stratum; q is the amount of water permeated into the groundwater reservoir via the overburden, and is given in m3(ii) a Q is subsurface infiltration in m3；qinThe total water injection quantity of the underground reservoir in a set time period is m3；qexThe total water pumping quantity of the underground reservoir in a set time period is m3；
V (h, t) is the water storage capacity of the underground reservoir when the time is t and the water level height is h, and the unit is m3；t1For the beginning of the set period of time, t2To set the end of the time period, h1The unit is m for the initial water level of a set time period; h is2For the end period t of a set period2Water level in m;
Qathe water amount of the upper aquifer is m3；QpIs the precipitation, and the unit is m3；QeIs the evaporation amount inIs m3；QlThe unit of the lateral supply quantity of the ground water body is m3；QwIs the supply amount of watershed in m3；
IpThe precipitation intensity in unit time of the area is m; s is the surface area of catchment area in m2；IeThe evaporation intensity per unit time of the area is given in m.
In some embodiments of the method for determining damage degree of an overburden during shallow coal mining based on an underground reservoir, the step of obtaining a water permeability coefficient of the overburden according to the subsurface infiltration capacity and the water infiltration capacity comprises:
the water storage capacity of the underground reservoir is obtained through the following steps:
theta is the dip angle of the coal bed and the unit is DEG; z represents the height of the section of the underground reservoir, s' (z) is the water storage area when the height of the underground reservoir is z, and the unit is m2And R (z, t) is the water storage coefficient.
In some embodiments of the method for determining damage degree of an overburden during shallow coal mining based on an underground reservoir, the step of determining damage degree of the overburden according to water permeability strength of the overburden comprises:
the higher the water seepage coefficient of the overlying rock stratum is, the higher the water seepage strength of the overlying rock stratum is, and the higher the damage degree of the overlying rock stratum is; wherein:
and dividing the damage degree of the overlying strata into a mild damage area, a moderate damage area and a severe damage area according to the range of the water permeability coefficient of the overlying strata.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
the invention provides a shallow coal mining overburden damage degree determining method based on an underground reservoir, which comprises the steps of determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area, acquiring surface water seepage of the subsidence area, monitoring water quantity change information of the underground reservoir in the subsidence area, determining water seepage strength of an overburden layer in the subsidence area according to the surface water seepage and the water quantity change information of the underground reservoir, and determining the damage degree of the overburden layer according to the water seepage strength of the overburden layer. In the scheme, based on the underground reservoir system of the coal mine, the change of the water storage capacity of the underground reservoir is utilized to reflect the change of the water seepage capacity of the overlying strata above the underground reservoir, the water seepage capacity of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judgment method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of quickly and simply judging the ecological damage of the overlying strata in coal mining.
Drawings
The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a method for determining damage degree of an overlying strata for shallow coal mining based on an underground reservoir according to an embodiment of the invention;
FIG. 2 is a water permeability relationship of an underground water reservoir and an overburden in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
After coal mining, a goaf is formed underground, the moving deformation of the overlying strata is induced, three zones (a caving zone, a water-guiding fracture zone and an integral deformation zone) are developed, the ecological deterioration of the earth surface is caused, and the damage of the overlying strata is caused. The damage of the overlying strata and the earth surface destroys the original underground water system, so that the underground seepage field is changed, and a large amount of mine water is generated. Based on the principle, the scheme in the following embodiment of the invention is based on the underground reservoir system constructed in the prior art, and the change of the water storage capacity of the underground reservoir is used for reflecting the change of the water seepage capacity of the overlying strata, so that the damage degree of the overlying strata is determined.
In this embodiment, a method for determining damage degree of an overburden of shallow coal mining based on an underground reservoir is provided, as shown in fig. 1, and includes the following steps:
the method comprises the following steps: determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area; the underground reservoir needs to have long-term water level and supply and drainage data monitoring conditions, the existing built underground reservoir can be directly adopted, the subsidence area and the catchment area are areas formed in the coal mining process, and the subsidence area, so the underground reservoir has a certain depression compared with a surrounding flat area, water quantity such as rainfall can be stored in the depression, the catchment area can be directly connected with the underground reservoir in a water conservancy mode, and finally the catchment area transmits the water collected in the subsidence area to the underground reservoir.
Step two: and acquiring the surface seepage quantity of the subsidence area. In the step, the water seepage capacity of the surface of the shallow coal mining area can be determined by analyzing geological parameters of the surface, and the water quantity received by the surface can be determined by detecting precipitation, evaporation and the water quantity generated by other conditions within a certain period of time, so that the water quantity permeating into the overlying rock of the surface can be judged according to the water seepage capacity of the surface and is used as the water seepage quantity of the surface.
Step three: and monitoring the water quantity change information of the underground reservoir in the subsidence area. The water volume change in the underground reservoir can be monitored by various sensors arranged in the underground reservoir.
Step four: and determining the water seepage strength of the upper overlying rock layer in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir. If the overlying strata is not damaged, the seepage amount of the surface seepage amount which should seep into the underground reservoir can be determined by detecting the seepage capability of the overlying strata in advance, but if the overlying strata is damaged, cracks and other situations which accelerate seepage can occur, and the proportion of the surface seepage amount which seeps into the underground reservoir can be increased. The water volume in the underground reservoir, in addition to the normal inflow and the normal pumped-out water output, is considered to be permeated from the overburden. Therefore, the water seepage strength of the overlying strata can be determined through the relation between the surface water seepage amount and the water quantity change information of the underground reservoir.
Step five: and determining the damage degree of the overburden according to the water seepage strength of the overburden.
According to the scheme provided by the embodiment, the subsidence area in the shallow coal mining area and the distribution information of the underground reservoirs in the subsidence area are determined, the surface seepage amount of the subsidence area is obtained, the water amount change information of the underground reservoirs in the subsidence area is monitored, the water seepage strength of the overlying strata in the subsidence area is determined according to the surface seepage amount and the water amount change information of the underground reservoirs, and the damage degree of the overlying strata is determined according to the water seepage strength of the overlying strata. In the scheme, based on the underground reservoir system of the coal mine, the change of the water storage capacity of the underground reservoir is utilized to reflect the change of the water seepage capacity of the overlying strata above the underground reservoir, the water seepage capacity of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judgment method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of quickly and simply judging the ecological damage of the overlying strata in coal mining.
In some embodiments, step one may comprise:
acquiring hydrogeological information in the shallow coal mining area. The hydrogeological information comprises overlying strata structure information, strata permeability information, natural water-resisting layer distribution information, upper water-bearing layer distribution information, lateral supply information of ground water and watershed supply information.
And secondly, determining a catchment area which is communicated with the underground reservoir in the shallow coal mining area according to the hydrogeological information.
And (III) defining the sinking area according to the catchment area.
During specific implementation, the hydrogeological data of the area around the underground reservoir can be obtained by adopting methods such as investigation, observation, data collection and the like, and according to the implementation principle of the scheme, the hydrogeological data can be determined to influence the surface water quantity change and the related information of the water seepage capacity of the surface and overlying strata during collection.
Further, the underground reservoir is designed as a water storage space having a water inlet passage and a water outlet passage; the inlet channel is provided with a sensing device for monitoring the water inflow, and the outlet channel is provided with a sensing device for monitoring the water outflow. Referring to fig. 2, a simple schematic diagram of an underground reservoir is shown, wherein the overburden 1 is permeable and flows to the underground reservoir 2 after being collected by a catchment area, the height of the liquid 3 in the underground reservoir 2 can be determined, and the water inlet 4 and the water outlet 5 can be respectively detected by a sensor device. Specifically, the method comprises the following steps: the underground reservoir 2 can be also provided with a liquid level sensor, and the liquid level sensor is used for monitoring the liquid level height information of the underground reservoir. On the basis, the water quantity change information of the underground reservoir is determined according to the water inlet quantity, the water outlet quantity, the liquid level height change and the water storage area of the underground reservoir in a set time period. In the step, the time length of a set time interval is determined by combining the running and using conditions of the reservoir, and the starting time and the ending time of monitoring are determined. And monitoring and recording the water level change of the underground reservoir, and counting the total water injection quantity and the total water pumping quantity of the underground reservoir in a calculation period. Specifically, the overburden rock deepwater strength can be judged by the following steps:
(1) and determining the seepage amount of the underground reservoir permeated through the overburden layer according to the monitored water amount change information of the underground reservoir in the set time period.
(2) And obtaining the water collection amount of the surface of the overlying rock stratum according to the precipitation amount, the evaporation amount, the surface water body lateral supply amount and the watershed supply amount of the shallow coal mining area in a set time period.
(3) And determining the subsurface infiltration volume according to the hydrogeological information and the water catchment amount.
(4) And obtaining the water seepage coefficient of the overlying strata according to the subsurface seepage and the seepage, wherein the water seepage coefficient of the overlying strata corresponds to the water seepage strength of the overlying strata.
Preferably, the overburden water permeability coefficient is obtained by:
K＝q/Q (1)；
q＝V(h1,t1)-V(h2,t2)-qin+qex (2)；
Q＝Qa+Qp+Ql+Qw-Qe (3)；
Qp＝Ip×(t2-t1)×S (4)；
Qe＝Ie×(t2-t1)×S (5)；
wherein K is the water permeability coefficient of the overburden stratum; q is the amount of water permeated into the groundwater reservoir via the overburden, and is given in m3(ii) a Q is subsurface infiltration in m3；qinThe total water injection quantity of the underground reservoir in a set time period is m3；qexThe total water pumping quantity of the underground reservoir in a set time period is m3(ii) a V (h, t) is the water storage capacity of the underground reservoir when the time is t and the water level height is h, and the unit is m3；t1For the beginning of the set period of time, t2To set the end of the time period, h1The unit is m for the initial water level of a set time period; h is2For the end period t of a set period2Water level in m; qaThe water amount of the upper aquifer is m3；QpIs the precipitation, and the unit is m3；QeIs the evaporation amount, in m3；QlThe unit of the lateral supply quantity of the ground water body is m3；QwIs the supply amount of watershed in m3；IpThe precipitation intensity in unit time of the area is m; s is the surface area of catchment area in m2；IeThe evaporation intensity per unit time of the area is given in m.
In the above formulas, the aquifer water volume may be 0, for example, after the upper aquifer is drained, the aquifer water volume is assigned 0 in formula (3); the precipitation value may also be 0 over a period of time; the surface water body lateral supply amount and the watershed supply amount can be 0 and even can be negative values. The method is determined according to the actual geographic positions of the underground reservoir and the goaf. Furthermore, the water source of the underground water reservoir may have not only five types mentioned in formula (3), but also other forms, when appearing, may be added up in formula (4).
The above scheme of this embodiment provides a simple method for calculating the water permeability of the overburden rock, which is used for judging the damage degree of the overburden rock and realizing the quick and simple judgment of the ecological damage of the overburden rock in coal mining.
In the above formula, the storage capacity of the underground reservoir is obtained as follows:
theta is the dip angle of the coal bed and the unit is DEG; z represents the height of the section of the underground reservoir, s' (z) is the water storage area when the height of the underground reservoir is z, and the unit is m2And R (z, t) is a water storage coefficient, and can also be calculated by an algorithm disclosed in a coal mine underground reservoir water storage coefficient measuring and calculating method in reference CN 201711222824.3.
In some schemes, after the water seepage coefficient of the overlying rock stratum is obtained, the higher the water seepage coefficient of the overlying rock stratum is, the higher the water seepage strength of the overlying rock stratum is, and the higher the damage degree of the overlying rock stratum is; wherein: and dividing the damage degree of the overlying strata into a mild damage area, a moderate damage area and a severe damage area according to the range of the water permeability coefficient of the overlying strata. The division standard of the damage areas with different degrees can be set through historical experience values, and can also be set through calibration simulation tests in a laboratory in advance. Compared with the earth surface damage exploration methods such as satellite remote sensing, the scheme provided by the embodiment has the advantages of simplicity, easiness in implementation and low cost.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. A shallow coal mining overburden damage degree determining method based on an underground reservoir is characterized by comprising the following steps:
determining a subsidence area in a shallow coal mining area and underground reservoir distribution information in the subsidence area;
acquiring the surface seepage amount of the subsidence area;
monitoring the water quantity change information of the underground reservoir in the subsidence area;
determining the water seepage strength of an upper overlying rock layer in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir;
and determining the damage degree of the overburden according to the water seepage strength of the overburden.
2. The method for determining the damage degree of the overlying strata for shallow coal mining based on the underground reservoir as claimed in claim 1, wherein the step of determining the subsidence area in the shallow coal mining area and the distribution information of the underground reservoir in the subsidence area comprises the following steps:
acquiring hydrogeological information in the shallow coal mining area;
determining a catchment area which is in water conservancy communication with an underground reservoir in the shallow coal mining area according to the hydrogeological information;
and defining the sinking area according to the catchment area.
3. The method for determining damage degree of overlying strata for shallow coal mining based on an underground reservoir as claimed in claim 2, wherein the step of determining the subsidence area in the shallow coal mining area and the distribution information of the underground reservoir in the subsidence area comprises:
the underground reservoir is designed into a water storage space with a water inlet channel and a water outlet channel;
the inlet channel is provided with a sensing device for monitoring the water inflow, and the outlet channel is provided with a sensing device for monitoring the water outflow.
4. The method for determining damage degree of overlying strata for shallow coal mining based on an underground reservoir as claimed in claim 3, wherein the step of determining the subsidence area in the shallow coal mining area and the distribution information of the underground reservoir in the subsidence area comprises:
the underground reservoir is provided with a liquid level sensor, and the liquid level sensor is used for monitoring liquid level height information of the underground reservoir.
5. The method for determining damage degree to overlying strata for shallow coal mining based on an underground reservoir as claimed in claim 4, wherein the step of monitoring the water volume change information of the underground reservoir in the subsidence area comprises:
and determining the water quantity change information of the underground reservoir according to the water inflow, the water outflow, the liquid level height change and the water storage area of the underground reservoir within a set time period.
6. The method for determining damage degree of overburden stratum in shallow coal mining based on underground reservoir as claimed in any one of claims 2-5, wherein in the step of determining the water seepage strength of overburden layer in the subsidence area according to the surface water seepage amount and the water change information of underground reservoir:
determining the seepage amount of the underground reservoir permeating into the underground reservoir through the overlying rock stratum according to the monitored water amount change information of the underground reservoir in a set time period;
obtaining the catchment amount of the surface of the overlying rock stratum according to the precipitation amount, the evaporation amount, the surface water body lateral supply amount and the watershed supply amount of the shallow coal mining area in a set time period;
determining subsurface seepage according to the hydrogeological information and the water catchment amount;
and obtaining the water seepage coefficient of the overlying strata according to the subsurface seepage and the seepage, wherein the water seepage coefficient of the overlying strata corresponds to the water seepage strength of the overlying strata.
7. The method for determining damage degree of overlying strata for shallow coal mining based on an underground reservoir as claimed in claim 6, wherein:
the hydrogeological information comprises overlying strata structure information, strata permeability information, natural water-resisting layer distribution information, upper water-bearing layer distribution information, lateral supply information of ground water and watershed supply information.
8. The method for determining damage degree to an overburden of a shallow coal mining based on an underground reservoir as claimed in claim 7, wherein in the step of obtaining the water permeability coefficient of the overburden according to the subsurface infiltration capacity and the infiltration capacity:
obtaining the water permeability coefficient of the overburden stratum by the following steps:
K＝q/Q (1)；
q＝V(h1,t1)-V(h2,t2)-qin+qex (2)；
Q＝Qa+Qp+Ql+Qw-Qe (3)；
Qp＝Ip×(t2-t1)×S (4)；
Qe＝Ie×(t2-t1)×S (5)；
wherein K is the water permeability coefficient of the overburden stratum; q is the amount of water permeated into the groundwater reservoir via the overburden, and is given in m3(ii) a Q is subsurface infiltration in m3；qinThe total water injection quantity of the underground reservoir in a set time period is m3；qexThe total water pumping quantity of the underground reservoir in a set time period is m3；
V (h, t) is the water storage capacity of the underground reservoir when the time is t and the water level height is h, and the unit is m3；t1For the beginning of the set period of time, t2To set the end of the time period, h1The unit is m for the initial water level of a set time period; h is2For the end period t of a set period2Water level in m;
Qathe water amount of the upper aquifer is m3；QpIs the precipitation, and the unit is m3；QeIs the evaporation amount, in m3；QlThe unit of the lateral supply quantity of the ground water body is m3；QwIs the supply amount of watershed in m3；
IpThe precipitation intensity in unit time of the area is m; s is the surface area of catchment area in m2；IeThe evaporation intensity per unit time of the area is given in m.
9. The method for determining damage degree to an overburden of a shallow coal mining based on an underground reservoir as claimed in claim 8, wherein in the step of obtaining the water permeability coefficient of the overburden according to the subsurface infiltration capacity and the infiltration capacity:
the water storage capacity of the underground reservoir is obtained through the following steps:
theta is the dip angle of the coal bed and the unit is DEG; z represents the height of the section of the underground reservoir, s' (z) is the water storage area when the height of the underground reservoir is z, and the unit is m2And R (z, t) is the water storage coefficient.
10. The method for determining damage degree of overburden for shallow coal mining based on an underground reservoir as claimed in claim 9, wherein in the step of determining damage degree of overburden according to water permeability of overburden:
the higher the water seepage coefficient of the overlying rock stratum is, the higher the water seepage strength of the overlying rock stratum is, and the higher the damage degree of the overlying rock stratum is; wherein:
and dividing the damage degree of the overlying strata into a mild damage area, a moderate damage area and a severe damage area according to the range of the water permeability coefficient of the overlying strata.
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