CN114152566B - Method for determining damage degree of overburden stratum in shallow coal exploitation based on underground reservoir - Google Patents
Method for determining damage degree of overburden stratum in shallow coal exploitation based on underground reservoir Download PDFInfo
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- CN114152566B CN114152566B CN202111439946.4A CN202111439946A CN114152566B CN 114152566 B CN114152566 B CN 114152566B CN 202111439946 A CN202111439946 A CN 202111439946A CN 114152566 B CN114152566 B CN 114152566B
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- 239000003245 coal Substances 0.000 title claims abstract description 64
- 230000006378 damage Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 186
- 230000008859 change Effects 0.000 claims abstract description 37
- 238000005065 mining Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 239000002352 surface water Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 230000009526 moderate injury Effects 0.000 claims description 3
- 230000008832 photodamage Effects 0.000 claims description 3
- 230000009528 severe injury Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 7
- 239000011435 rock Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/08—Detecting presence of flaws or irregularities
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses a method for determining damage degree of an overburden layer in shallow coal exploitation based on an underground reservoir, which comprises the following steps: determining subsidence areas in shallow coal mining areas and underground reservoir distribution information in the subsidence areas, acquiring surface water seepage quantity of the subsidence areas, monitoring underground reservoir water quantity change information in the subsidence areas, determining water seepage intensity of overlying strata in the subsidence areas according to the surface water seepage quantity and the underground reservoir water quantity change information, and determining damage degree of the overlying strata according to the water seepage intensity of the overlying strata. In the scheme, based on the underground coal mine reservoir system, the water seepage capability of the overlying strata above the underground coal mine reservoir system is utilized to react to the change of the water seepage capability of the overlying strata, the water seepage capability of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judging method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of rapid and simple judgment of ecological damage of the overlying strata in coal mining.
Description
Technical Field
The invention relates to the field of ecological damage detection in coal mining, in particular to a method for determining damage degree of an overlying strata in shallow coal mining based on an underground reservoir.
Background
The mining overburden rock damage change is a dynamic process, continuous change information of the mining whole period is difficult to obtain by a conventional geological exploration method, a high-precision geophysical exploration technology is integrated, and comprehensive exploration is carried out on a ground surface layer and a overburden rock body to study the mining overburden rock change rule, and means such as satellite remote sensing, image radar, measurement analysis and the like are mainly adopted. The equipment required by the detection technology belongs to high-precision instruments, and the operation difficulty and the analysis difficulty are high. The remote sensing monitoring method has higher time and money cost, and the use threshold is also higher, so that the application range is greatly limited.
Disclosure of Invention
The invention aims to solve the technical problems of high operation and analysis difficulty, high cost and low efficiency of a detection instrument in the existing mining overburden damage judging method, and provides a method for determining the damage degree of an overburden layer in shallow coal mining based on an underground reservoir.
Aiming at the technical problems, the invention provides the following technical scheme:
the invention provides a method for determining damage degree of an overburden layer in shallow coal exploitation based on an underground reservoir, which comprises the following steps:
determining subsidence areas in shallow coal mining areas and underground reservoir distribution information in the subsidence areas;
obtaining the surface water seepage quantity of the subsidence area;
monitoring the water quantity change information of the underground reservoir in the subsidence area;
determining the water seepage intensity of the overlying strata 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 seepage intensity of the overburden.
According to the method for determining the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir, which is disclosed by some embodiments of the invention, the steps of determining the subsidence area in the shallow coal exploitation area and the underground reservoir distribution information in the subsidence area comprise the following steps:
acquiring hydrogeologic information in the shallow coal mining area;
determining a catchment area which is communicated with underground reservoir water conservancy in the shallow coal mining area according to the hydrogeological information;
and defining the subsidence area according to the catchment area.
According to the method for determining the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir, disclosed by some embodiments of the invention, in the step of determining the subsidence area in the shallow coal exploitation area and the underground reservoir distribution information in the subsidence area:
the underground reservoir is designed as a water storage space with a water inlet channel and a water outlet channel;
the water inlet channel is provided with a sensing device for monitoring water inflow, and the water outlet channel is provided with a sensing device for monitoring water outlet.
According to the method for determining the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir, disclosed by some embodiments of the invention, in the step of determining the subsidence area in the shallow coal exploitation area and the underground reservoir distribution information in the subsidence area:
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 the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir according to some embodiments of the present invention, the step of monitoring the water quantity change information of the underground reservoir in the subsidence area includes:
and determining the water quantity change information of the underground reservoir according to the water inflow, the water outflow and the liquid level height change and the water storage area of the underground reservoir within a set period.
According to the method for determining the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir, which is disclosed by some embodiments of the invention, in the step of determining the water seepage intensity of the overlying strata in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir:
determining the seepage amount of the underground reservoir permeated through the overlying strata according to the monitored water amount change information of the underground reservoir within a set period;
obtaining the water collecting quantity on the surface of the overlying strata according to the precipitation quantity, evaporation quantity, lateral supply quantity of the ground water body and the water diversion ridge supply quantity of the shallow coal mining area in a set period;
determining subsurface seepage according to the hydrogeologic information and the catchment quantity;
and obtaining the water seepage coefficient of the overburden according to the subsurface seepage quantity and the seepage quantity, wherein the water seepage coefficient of the overburden corresponds to the water seepage intensity of the overburden.
According to the method for determining the damage degree of the overburden based on shallow coal exploitation of the underground reservoir, the hydrogeological information comprises overburden structure information, formation permeability information, natural water-resisting layer distribution information, upper water-bearing layer distribution information, lateral supply information of ground water and watershed supply information.
According to the method for determining the damage degree of the overburden based on shallow coal exploitation of the underground reservoir, which is disclosed by the embodiment of the invention, in the step of obtaining the water seepage coefficient of the overburden according to the subsurface seepage and the seepage:
the water permeability coefficient of the overlying strata is obtained by the following steps:
K＝q/Q (1)；
q＝V(h 1 ,t 1 )-V(h 2 ,t 2 )-q in +q ex (2)；
Q＝Q a +Q p +Q l +Q w -Q e (3)；
Q p ＝I p ×(t 2 -t 1 )×S (4)；
Q e ＝I e ×(t 2 -t 1 )×S (5)；
wherein K is the water seepage coefficient of the overlying strata; q is the water seepage amount permeated into the underground reservoir through the overburden stratum, and the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Q is subsurface seepage quantity, and the unit is m 3 ；q in For the total water injection amount of the underground reservoir in a set period of time, the unit is m 3 ；q ex For the total water pumping amount of the underground reservoir in a set period of time, the unit is m 3 ；
V (h, t) is the water storage capacity of the underground reservoir with the time t and the water level height h, and the unit is m 3 ；t 1 To set the initial period of time, t 2 To set the final period of the period, h 1 The initial water level of the set period is m; h is a 2 For setting the final period t of the period 2 The water level is m;
Q a is the water quantity of the upper aquifer, and the unit is m 3 ；Q p Is precipitation amount, the unit is m 3 ；Q e The unit is m 3 ；Q l The unit of the lateral replenishment quantity for the ground water body is m 3 ；Q w The unit of the feed is m 3 ；
I p The precipitation intensity in unit time of the area is m; s is the surface area of the catchment area, in m 2 ；I e The evaporation intensity per unit time of the area is expressed as m.
According to the method for determining the damage degree of the overburden based on shallow coal exploitation of the underground reservoir, which is disclosed by the embodiment of the invention, in the step of obtaining the water seepage coefficient of the overburden according to the subsurface seepage and the seepage:
the water storage capacity of the underground reservoir is obtained by the following steps:
θ is the inclination angle of the coal seam in degrees; z represents the section height of the underground reservoir, s' (z) is the water storage area of the underground reservoir when the height of the underground reservoir is z, and the unit is m 2 R (z, t) is the water storage coefficient.
According to the method for determining the damage degree of the overburden based on shallow coal exploitation of the underground reservoir, which is disclosed by the embodiment of the invention, in the step of determining the damage degree of the overburden according to the seepage intensity of the overburden:
the higher the water seepage coefficient of the overlying strata is, the higher the water seepage intensity of the overlying strata is, and the higher the damage degree of the overlying strata is; wherein:
and dividing the damage degree of the overlying strata into a light damage region, a moderate damage region and a severe damage region according to the water seepage coefficient range of the overlying strata.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
the method for determining the damage degree of the overburden based on the shallow coal exploitation of the underground reservoir, provided by the invention, comprises the steps of determining the subsidence area in the shallow coal exploitation area and the underground reservoir distribution information in the subsidence area, obtaining the surface water seepage quantity of the subsidence area, monitoring the change information of the underground reservoir water quantity in the subsidence area, determining the water seepage intensity of the overburden in the subsidence area according to the surface water seepage quantity and the change information of the underground reservoir water quantity, and determining the damage degree of the overburden according to the water seepage intensity of the overburden. In the scheme, based on the underground coal mine reservoir system, the water seepage capability of the overlying strata above the underground coal mine reservoir system is utilized to react to the change of the water seepage capability of the overlying strata, the water seepage capability of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judging method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of rapid and simple judgment of ecological damage of the overlying strata in coal mining.
Drawings
The objects and advantages of the present invention will be better understood by describing in detail preferred embodiments thereof with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a method for determining damage degree of overburden in shallow coal mining based on an underground reservoir according to an embodiment of the present invention;
fig. 2 is a water penetration relationship between an underground reservoir and an overburden according to one embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
After coal exploitation, a goaf is formed underground, the movement deformation of an overlying strata is induced, the development of three zones (a caving zone, a water guide fracture zone and an integral deformation zone) and the ecological deterioration of the ground surface are caused, and the damage of the overlying strata is caused. The damage of overlying rock and earth surface damages the original underground water system, so that the underground seepage field is changed to generate a large amount of mine water, and the inventor finds that the damage degree of the overlying rock caused by coal exploitation is an important component of the evolution rule of the seepage field in the process of realizing the invention. 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 utilized to reflect 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 layer in shallow coal mining based on an underground reservoir is provided, as shown in fig. 1, and includes the following steps:
step one: determining subsidence areas in shallow coal mining areas and underground reservoir distribution information in the subsidence areas; the underground reservoir is required 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 exploitation process, so the name suggests that the underground reservoir is provided with a certain pit compared with a surrounding flat area, the water quantity such as rainfall can be stored in the pit, the catchment area can be directly connected with the underground reservoir through water, and the catchment area finally transmits the water collected in the subsidence area to the underground reservoir.
Step two: and obtaining the surface water seepage quantity of the subsidence area. In the step, the water seepage capacity of the shallow coal mining area can be determined after the analysis of geological parameters of the surface of the shallow coal mining area, and in a certain time, the water quantity received by the surface can be determined by detecting the precipitation quantity, the evaporation quantity and the water quantity generated by other conditions, so that the water quantity of the surface permeated into the overlying strata can be judged according to the water seepage capacity of the surface, and the water quantity is taken as the surface water seepage quantity.
Step three: and monitoring the water quantity change information of the underground reservoir in the subsidence area. The water quantity change in the underground reservoir can be monitored by various sensors arranged in the underground reservoir.
Step four: and determining the water seepage intensity of the overlying strata 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 capacity of the overlying strata is detected in advance, so that the seepage amount of the surface seepage amount into the underground reservoir can be determined, but if the overlying strata is damaged, the situation that cracks and the like quicken seepage occurs, and the proportion of the surface seepage amount into the underground reservoir is increased. In addition to the water inflow from the underground reservoir and the water outflow from the water pump, other water changes can be considered to be penetrated from the overburden. Therefore, the water seepage intensity of the overlying strata can be determined through the relation between the surface water seepage quantity and the water quantity change information of the underground reservoir.
Step five: and determining the damage degree of the overburden according to the seepage intensity of the overburden.
According to the scheme provided by the embodiment, the subsidence area in the shallow coal mining area and the underground reservoir distribution information in the subsidence area are determined, the surface water seepage quantity of the subsidence area is obtained, the underground reservoir water quantity change information in the subsidence area is monitored, the water seepage intensity of the overlying strata in the subsidence area is determined according to the surface water seepage quantity and the underground reservoir water quantity change information, and the damage degree of the overlying strata is determined according to the water seepage intensity of the overlying strata. In the scheme, based on the underground coal mine reservoir system, the water seepage capability of the overlying strata above the underground coal mine reservoir system is utilized to react to the change of the water seepage capability of the overlying strata, the water seepage capability of the overlying strata is used as an influence factor of the damage degree of the overlying strata, and a specific judging method is provided. The scheme of the invention has the advantages of simple method and reliable result, and realizes the effect of rapid and simple judgment of ecological damage of the overlying strata in coal mining.
In some embodiments, the step one may include:
and (one) obtaining hydrogeologic information in the shallow coal mining area. The hydrogeologic 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 body and watershed supply information.
And (II) determining a catchment area which is in hydraulic communication with the underground reservoir in the shallow coal mining area according to the hydrogeological information.
And (III) defining the subsidence area according to the catchment area.
In the concrete implementation, hydrogeologic data of the surrounding area of the underground reservoir can be obtained by adopting methods of investigation, observation, data collection and the like, and the implementation principle of the scheme can be used for determining that the relative information of the surface water volume change and the surface water seepage capability and the overburden water seepage capability can be influenced when the hydrogeologic data are collected.
Further, the underground reservoir is designed as a water storage space with a water inlet channel and a water outlet channel; the water inlet channel is provided with a sensing device for monitoring water inflow, and the water outlet channel is provided with a sensing device for monitoring water outlet. Referring to fig. 2, there is shown a simplified schematic diagram of an underground reservoir, in which an overburden 1 is permeable to water and flows to an underground reservoir 2 after being collected by a water collecting area, the height of a liquid 3 in the underground reservoir 2 is determinable, and a water inlet 4 and a water outlet 5 are respectively accessible to water detection by sensing means. Specifically: a liquid level sensor can be further arranged in the underground reservoir 2, and the liquid level sensor is used for monitoring liquid level height information of the underground reservoir. On the basis, the water volume change information of the underground reservoir is determined according to the water inflow, the water outflow and the liquid level height change and the water storage area of the underground reservoir within a set period. In the step, the time length of a set period is determined according to the running use condition of the water reservoir, and the starting time and the stopping time of the 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 the calculation period. Specifically, the overlying strata deep water strength can be judged by the following steps:
(1) And determining the seepage amount of the underground reservoir permeated through the overlying strata according to the monitored water amount change information of the underground reservoir within a set period.
(2) And obtaining the water collecting quantity on the surface of the overlying strata according to the precipitation quantity, the evaporation quantity, the lateral supply quantity of the ground water body and the water diversion ridge supply quantity of the shallow coal mining area in the set period.
(3) And determining subsurface seepage according to the hydrogeological information and the catchment quantity.
(4) And obtaining the water seepage coefficient of the overburden according to the subsurface seepage quantity and the seepage quantity, wherein the water seepage coefficient of the overburden corresponds to the water seepage intensity of the overburden.
Preferably, the water permeability coefficient of the overburden is obtained by:
K＝q/Q (1)；
q＝V(h 1 ,t 1 )-V(h 2 ,t 2 )-q in +q ex (2)；
Q＝Q a +Q p +Q l +Q w -Q e (3)；
Q p ＝I p ×(t 2 -t 1 )×S (4)；
Q e ＝I e ×(t 2 -t 1 )×S (5)；
wherein K is the water seepage coefficient of the overlying strata; q is the water seepage amount permeated into the underground reservoir through the overburden stratum, and the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Q is subsurface seepage quantity, and the unit is m 3 ；q in For the total water injection amount of the underground reservoir in a set period of time, the unit is m 3 ；q ex For the total water pumping amount of the underground reservoir in a set period of time, the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the V (h, t) is the water storage capacity of the underground reservoir with the time t and the water level height h, and the unit is m 3 ；t 1 To set the initial period of time, t 2 To set the final period of the period, h 1 To set upThe initial water level of the fixed period is m; h is a 2 For setting the final period t of the period 2 The water level is m; q (Q) a Is the water quantity of the upper aquifer, and the unit is m 3 ；Q p Is precipitation amount, the unit is m 3 ；Q e The unit is m 3 ；Q l The unit of the lateral replenishment quantity for the ground water body is m 3 ；Q w The unit of the feed is m 3 ；I p The precipitation intensity in unit time of the area is m; s is the surface area of the catchment area, in m 2 ；I e The evaporation intensity per unit time of the area is expressed as m.
In the above formulas, the water content of the aquifer may be 0, for example, after the upper aquifer is drained, the water content of the aquifer in formula (3) is assigned to be 0; the precipitation magnitude may also be 0 over a period of time; the lateral supply amount of the surface water body and the water diversion ridge supply amount can be 0 or even negative. The method is carried out according to the actual geographic positions of the underground reservoir and the goaf. Moreover, the water source of the underground reservoir may have not only the five types mentioned in formula (3) but also other forms, when other forms occur, may be accumulated in formula (4).
The scheme of the embodiment provides a simple method for calculating the water seepage capability of the overburden, which is used for judging the damage degree of the overburden, and realizes the quick and simple judgment of the ecological damage of the overburden in coal mining.
In the formula, the water storage capacity of the underground reservoir is obtained by the following steps:
θ is the inclination angle of the coal seam in degrees; z represents the section height of the underground reservoir, s' (z) is the water storage area of the underground reservoir when the height of the underground reservoir is z, and the unit is m 2 R (z, t) is a water storage coefficient, which can also be calculated by an algorithm disclosed in a method for measuring and calculating the water storage coefficient of an underground reservoir of a coal mine in reference CN 201711222824.3.
In some schemes, after the water seepage coefficient of the overburden is obtained, the higher the water seepage coefficient of the overburden is, the higher the water seepage strength of the overburden is, and the higher the damage degree of the overburden is; wherein: and dividing the damage degree of the overlying strata into a light damage region, a moderate damage region and a severe damage region according to the water seepage coefficient range of the overlying strata. The dividing 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 satellite remote sensing and other earth surface damage exploration methods, the scheme provided by the embodiment has the advantages of simplicity, easiness in implementation and low cost.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (5)
1. The method for determining the damage degree of the overburden layer in shallow coal exploitation based on the underground reservoir is characterized by comprising the following steps:
determining subsidence areas in shallow coal mining areas and underground reservoir distribution information in the subsidence areas;
obtaining the surface water seepage quantity of the subsidence area;
monitoring the water quantity change information of the underground reservoir in the subsidence area;
determining the water seepage intensity of the overlying strata in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir;
determining the damage degree of the overburden according to the water seepage intensity of the overburden;
the step of determining the subsidence area in the shallow coal mining area and the underground reservoir distribution information in the subsidence area comprises the following steps:
acquiring hydrogeologic information in the shallow coal mining area;
determining a catchment area which is communicated with underground reservoir water conservancy in the shallow coal mining area according to the hydrogeological information;
defining the subsidence area according to the catchment area;
in the step of determining the water seepage intensity of the overlying strata in the subsidence area according to the surface water seepage amount and the water change information of the underground reservoir:
determining the seepage amount of the underground reservoir permeated through the overlying strata according to the monitored water amount change information of the underground reservoir within a set period;
obtaining the water collecting quantity on the surface of the overlying strata according to the precipitation quantity, evaporation quantity, lateral supply quantity of the ground water body and the water diversion ridge supply quantity of the shallow coal mining area in a set period;
determining subsurface seepage according to the hydrogeologic information and the catchment quantity;
obtaining an overburden water seepage coefficient according to the subsurface seepage quantity and the seepage quantity, wherein the overburden water seepage coefficient corresponds to the overburden water seepage intensity;
the hydrogeologic 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 body and watershed supply information;
the step of obtaining the water seepage coefficient of the overlying strata according to the subsurface seepage quantity and the seepage quantity comprises the following steps:
the water permeability coefficient of the overlying strata is obtained by the following steps:
K＝q/Q (1)；
q＝V(h 1 ,t 1 )-V(h 2 ,t 2 )-q in +q ex (2)；
Q＝Q a +Q p +Q l +Q w -Q e (3)；
Q p ＝I p ×(t 2 -t 1 )×S (4)；
Q e ＝I e ×(t 2 -t 1 )×S (5)；
wherein,k is the water seepage coefficient of the overlying strata; q is the water seepage amount permeated into the underground reservoir through the overburden stratum, and the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Q is subsurface seepage quantity, and the unit is m 3 ；q in For the total water injection amount of the underground reservoir in a set period of time, the unit is m 3 ；q ex For the total water pumping amount of the underground reservoir in a set period of time, the unit is m 3 ；
V (h, t) is the water storage capacity of the underground reservoir with the time t and the water level height h, and the unit is m 3 ；t 1 To set the initial period of time, t 2 To set the final period of the period, h 1 The initial water level of the set period is m; h is a 2 For setting the final period t of the period 2 The water level is m;
Q a is the water quantity of the upper aquifer, and the unit is m 3 ；Q p Is precipitation amount, the unit is m 3 ；Q e The unit is m 3 ；Q l The unit of the lateral replenishment quantity for the ground water body is m 3 ；Q w The unit of the feed is m 3 ；
I p The precipitation intensity in unit time of the area is m; s is the surface area of the catchment area, in m 2 ；I e The evaporation intensity in unit time of the area is m;
the step of obtaining the water seepage coefficient of the overlying strata according to the subsurface seepage quantity and the seepage quantity comprises the following steps:
the water storage capacity of the underground reservoir is obtained by the following steps:
θ is the inclination angle of the coal seam in degrees; z represents the section height of the underground reservoir, s' (z) is the water storage area of the underground reservoir when the height of the underground reservoir is z, and the unit is m 2 R (z, t) is the water storage coefficient.
2. The method for determining the damage degree of an overburden based on shallow coal mining of an underground reservoir according to claim 1, wherein in the step of determining the subsidence area in the shallow coal mining area and the underground reservoir distribution information in the subsidence area:
the underground reservoir is designed as a water storage space with a water inlet channel and a water outlet channel;
the water inlet channel is provided with a sensing device for monitoring water inflow, and the water outlet channel is provided with a sensing device for monitoring water outlet.
3. The method for determining the damage degree of an overburden based on shallow coal mining of an underground reservoir according to claim 2, wherein in the step of determining the subsidence area in the shallow coal mining area and the underground reservoir distribution information in the subsidence area:
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.
4. The method for determining the damage degree of the overlying strata based on shallow coal exploitation of the underground reservoir according to claim 3, wherein in the step of monitoring the water quantity change information of the underground reservoir in the subsidence area:
and determining the water quantity change information of the underground reservoir according to the water inflow, the water outflow and the liquid level height change and the water storage area of the underground reservoir within a set period.
5. The method for determining the damage degree of an overburden based on shallow coal mining of an underground reservoir according to claim 4, wherein in the step of determining the damage degree of the overburden based on the seepage intensity of the overburden:
the higher the water seepage coefficient of the overlying strata is, the higher the water seepage intensity of the overlying strata is, and the higher the damage degree of the overlying strata is; wherein:
and dividing the damage degree of the overlying strata into a light damage region, a moderate damage region and a severe damage region according to the water seepage coefficient range of the overlying strata.
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