Ground and underground combined water yield calculation method and system suitable for coal mine

Abstract

The invention relates to a ground and underground combined water yield calculation method and system suitable for a coal mine. The method comprises the steps that the electromagnetic wave field intensity of a coal seam is obtained through an underground wireless electromagnetic wave perspective method, and the apparent conductivity near the coal seam is obtained through a ground direct current sounding method; calculating an attenuation coefficient according to the electromagnetic wave field intensity; calculating a coal seam dielectric constant according to the apparent conductivity and the attenuation coefficient; and determining the coal seam internal water abundance according to the coal seam dielectric constant. According to the method, the ground direct current method and the underground wireless electromagnetic wave perspective method are combined, the apparent conductivity is obtained through the ground direct current method, the attenuation coefficient is obtained through the underground wireless electromagnetic wave perspective method, the coal seam dielectric constant is calculated through combination of the ground direct current method and the underground wireless electromagnetic wave perspective method, and then the coal seam interior water abundance is determined. According to the method, ground detection data and underground detection data are integrated, false anomalies are effectively suppressed, the multiplicity of solutions of achievements is reduced, and therefore the accuracy of water yield calculation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a ground-underground combined water-richness calculation method and system applicable to coal mines. Background Art

[0002] In the process of coal mining, understanding the water content inside the working face is crucial to ensure safe production. Water content detection helps to identify potential aquifers or water bodies, thereby preventing water disasters. Therefore, the coal mining industry has been seeking accurate and reliable methods for water content detection.

[0003] At present, the detection of water-richness inside the working face of coal mines mainly relies on one or several technical methods such as slot wave seismic, audio frequency electro-perspective, radio wave perspective, transient electromagnetic method, etc. These methods detect underground geological structures through different physical principles to reveal potential water-rich areas.

[0004] The existing technologies mainly have the following defects: 1) The underground detection environment is highly disturbed: Due to the complexity of the mine environment, such as electromagnetic interference, the complexity of geological structures, etc., these underground detection methods are often seriously disturbed, resulting in inaccurate detection results. 2) False anomalies cannot be suppressed: It is difficult for existing technologies to effectively distinguish between real signals and interference signals, resulting in a large number of false anomalies in the detection results, further reducing the reliability of the detection results. 3) The results have multiple solutions: Due to the complexity of geological structures and the limitations of detection methods, existing technologies often cannot produce unique and definite detection results, but there are multiple possible explanations, which increases the difficulty and risk of decision-making. Summary of the invention

[0005] In view of this, it is necessary to provide a ground and underground combined water richness calculation method suitable for coal mines to solve the above-mentioned defects of the prior art.

[0006] In order to solve the above problems, in a first aspect, an embodiment of the present invention provides a ground-underground combined water-richness calculation method applicable to a coal mine, comprising:

[0007] The electromagnetic wave field strength of the coal seam is obtained by underground radio electromagnetic wave perspective method, and the apparent conductivity near the coal seam is obtained by ground direct current sounding method;

[0008] Calculating the attenuation coefficient according to the electromagnetic wave field intensity;

[0009] The dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient;

[0010] The water richness inside the coal seam is determined based on the dielectric constant of the coal seam.

[0011] Preferably, the method of obtaining the electromagnetic wave field strength of the coal seam by using underground radio electromagnetic wave perspective method includes:

[0012] A transmitting point and a receiving point are arranged in the tunnels on both sides of the coal mining working face; wherein the transmitting point is used to transmit radio electromagnetic wave signals, and the receiving point is used to receive electromagnetic wave signals penetrating the coal seam from the transmitting point;

[0013] The electromagnetic wave field strength at each receiving point is obtained by underground radio electromagnetic wave perspective method.

[0014] Preferably, the method of obtaining the apparent conductivity of the coal seam by using the ground direct current sounding method includes:

[0015] Set up measuring points at the ground position corresponding to each receiving point to ensure that the DC depth inversion depth is greater than the coal seam burial depth;

[0016] Measure the voltage and current values ​​at each measuring point.

[0017] Convert the normalized voltage of different pole distances at each measuring point into apparent resistivity;

[0018] Through inversion technology, using the apparent resistivity data of the measuring points, the apparent resistivity of strata at different depths is inferred, and the resistivity value of the depth of the coal seam is obtained.

[0019] The resistivity value at the depth of the coal seam is calculated inversely to obtain the apparent conductivity near the coal seam.

[0020] Preferably, the calculating the attenuation coefficient according to the electromagnetic wave field intensity includes:

[0021] The attenuation coefficient is calculated using the following formula:

[0022]

[0023] Where α is the attenuation coefficient, H is the electromagnetic wave field strength, H0 is the initial radiation field strength, r is the distance between the transmitting point and the receiving point, and ψ is the angle between the antenna axis of the transmitting point and the direction of the test point in the electromagnetic wave.

[0024] Preferably, the dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient, comprising:

[0025] The dielectric constant of coal seams is calculated by the following formula:

[0026]

[0027] in,

[0028] Where ε is the dielectric constant of the coal seam, μ is the vacuum magnetic permeability, ω is the angular frequency, σ is the apparent conductivity, and α is the attenuation coefficient.

[0029] Preferably, determining the water richness inside the coal seam according to the dielectric constant of the coal seam includes:

[0030] The dielectric constant of the coal seam is positively correlated with the water-richness inside the coal seam. The larger the dielectric constant of the coal seam, the stronger the water-richness inside the coal seam.

[0031] In a second aspect, an embodiment of the present invention provides a ground-underground combined water-richness calculation system applicable to coal mines, comprising:

[0032] An acquisition module is used to obtain the electromagnetic wave field strength of the coal seam using the underground radio electromagnetic wave perspective method, and to obtain the apparent conductivity near the coal seam using the ground direct current sounding method;

[0033] An attenuation coefficient calculation module, used to calculate the attenuation coefficient according to the electromagnetic wave field strength;

[0034] A dielectric constant calculation module, used for calculating the dielectric constant of the coal seam according to the apparent conductivity and the attenuation coefficient;

[0035] The water-richness determination module is used to determine the water-richness inside the coal seam based on the dielectric constant of the coal seam.

[0036] In a third aspect, the present invention further provides an electronic device, including a memory and a processor, wherein:

[0037] The memory is used to store programs;

[0038] The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the ground-underground combined water-richness calculation method applicable to coal mines as described in the embodiment of the first aspect of the present invention.

[0039] In a fourth aspect, the present invention further provides a computer-readable storage medium for storing computer-readable programs or instructions, which, when executed by a processor, can implement the steps in the ground-underground combined water-richness calculation method applicable to coal mines as described in the embodiment of the first aspect of the present invention.

[0040] The combined surface and underground water-richness calculation method and system for coal mines provided by the present invention have the following beneficial effects compared with the prior art:

[0041] 1) The present invention combines the ground direct current method and the underground radio electromagnetic wave perspective method, uses the ground direct current method to obtain the apparent conductivity, and uses the underground radio electromagnetic wave perspective method to obtain the attenuation coefficient. The two are combined to calculate the dielectric constant of the coal seam, and then determine the water richness inside the coal seam. This method integrates the detection data of the ground and the underground, effectively suppresses false anomalies, reduces the multi-solution of the results, and thus improves the accuracy of the water richness calculation.

[0042] 2) The existing technology mainly relies on underground detection, which is greatly affected by the interference of the mine environment. The present invention reduces the interference of the underground environment by introducing the ground DC depth sounding method and enhances the environmental adaptability of the water-rich detection method. The present invention combines two detection methods, taking into account both the electrical characteristics of the ground and the electromagnetic wave propagation characteristics of the underground, thereby providing more comprehensive detection information. Provide more powerful support for coal mining and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A flow chart of the combined surface and underground water-richness calculation method applicable to coal mines provided by the present invention;

[0044] Figure 2 This is a schematic diagram of the layout of transmitting points and receiving points in the tunnels on both sides of the coal mining working face;

[0045] Figure 3 A structural block diagram of the ground-underground combined water-richness calculation system applicable to coal mines provided by the present invention;

[0046] Figure 4 This is a structural block diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] At present, the detection of water-richness inside the working face of underground coal mines mainly relies on one or several technical methods such as slot wave seismic, audio frequency electro-perspective, radio wave perspective, transient electromagnetic method, etc. These methods detect underground geological structures through different physical principles to reveal potential water-rich areas. The existing technologies mainly have the following defects: 1) The underground detection environment is highly disturbed: Due to the complexity of the mine environment, such as electromagnetic interference, the complexity of geological structure, etc., these underground detection methods are often seriously disturbed, resulting in inaccurate detection results. 2) False anomalies cannot be suppressed: It is difficult for existing technologies to effectively distinguish between real signals and interference signals, resulting in a large number of false anomalies in the detection results, further reducing the reliability of the detection results. 3) There are multiple solutions to the results: Due to the complexity of geological structures and the limitations of detection methods, existing technologies often cannot produce unique and definite detection results, but there are multiple possible explanations, which increases the difficulty and risk of decision-making.

[0050] In view of this, the present invention provides a ground and underground joint water-richness calculation method suitable for coal mines, combining the ground direct current method and the underground radio electromagnetic wave perspective method, using the ground direct current method to obtain the apparent conductivity, and using the underground radio electromagnetic wave perspective method to obtain the attenuation coefficient, and the two are combined to calculate the dielectric constant of the coal seam, and then determine the water-richness inside the coal seam. This method integrates the detection data of the ground and underground, effectively suppresses false anomalies, reduces the multi-solution of the results, and thus improves the accuracy of the water-richness calculation. The following will be explained and introduced through multiple embodiments.

[0051] Figure 1 The present invention provides a flow chart of the combined ground and underground water-richness calculation method applicable to coal mines. Figure 1 As shown, the ground-underground combined water-richness calculation method applicable to coal mines includes the following steps S1 to S4, wherein:

[0052] Step S1, using underground radio electromagnetic wave perspective method to obtain the electromagnetic wave field strength of the coal seam, and using ground direct current sounding method to obtain the apparent conductivity near the coal seam.

[0053] Step S1 may include steps S11 and S12, wherein:

[0054] S11, using underground radio electromagnetic wave perspective method to obtain the electromagnetic wave field strength of coal seam.

[0055] In this embodiment, the "underground wireless electromagnetic wave perspective method" is to set up transmitting points and receiving points in the underground tunnels of the coal mine, transmit electromagnetic waves and receive electromagnetic wave signals after penetrating the coal seam, and obtain the response of the coal seam to the electromagnetic waves, especially the field strength information of the electromagnetic waves in the process of penetrating the coal seam.

[0056] In actual operation, transmitting points and receiving points can be firstly arranged in the tunnels on both sides of the coal mining working face. Figure 2 This is a schematic diagram of the layout of transmitting points and receiving points in the tunnels on both sides of the coal mining working face. The transmitting point is used to transmit radio electromagnetic wave signals, and the receiving point is used to receive electromagnetic wave signals that penetrate the coal seam from the transmitting point. Then, the electromagnetic wave field strength of each receiving point is obtained by the underground radio electromagnetic wave perspective method. The electromagnetic wave field strength reflects the attenuation and propagation speed of the coal seam, which is closely related to the internal structure, material composition and water richness of the coal seam.

[0057] S12, use the ground direct current sounding method to obtain the apparent conductivity near the coal seam.

[0058] In this embodiment, the "direct current sounding method" is to set up measuring points on the surface, emit direct current underground, and then measure the voltage and current data of each measuring point on the surface. These data can be used to calculate the resistivity of the formation, and then deduce the apparent conductivity near the coal seam.

[0059] The embodiment of the present invention combines two detection methods, taking into account both the electrical characteristics of the ground and the electromagnetic wave propagation characteristics of the underground, thereby providing more comprehensive detection information and providing more powerful support for coal mining and safety.

[0060] Step S2, calculating the attenuation coefficient according to the electromagnetic wave field strength.

[0061] As a preferred implementation, the attenuation coefficient can be calculated by the following formula:

[0062]

[0063] Where α is the attenuation coefficient, H is the electromagnetic wave field strength, H0 is the initial radiation field strength, r is the distance between the transmitting point and the receiving point, and ψ is the angle between the antenna axis of the transmitting point and the direction of the test point in the electromagnetic wave.

[0064] Step S3, calculating the dielectric constant of the coal seam according to the apparent conductivity and the attenuation coefficient.

[0065] As a preferred embodiment, the dielectric constant of the coal seam can be calculated by the following formula:

[0066]

[0067] in,

[0068] Where ε is the dielectric constant of the coal seam, μ is the vacuum magnetic permeability, ω is the angular frequency, σ is the apparent conductivity, and α is the attenuation coefficient.

[0069] Step S4, determining the water richness inside the coal seam according to the dielectric constant of the coal seam.

[0070] It can be understood that the dielectric constant of a coal seam refers to the degree of polarization of the coal seam under the action of an electric field. It reflects the response characteristics of the coal seam to the electric field and is an important indicator of the electromagnetic properties of the coal seam.

[0071] In this embodiment, it is known that the dielectric constant of the coal seam is positively correlated with the water-richness inside the coal seam. The water-richness inside the coal seam can be determined based on the dielectric constant of the coal seam. The larger the dielectric constant of the coal seam, the stronger the water-richness inside the coal seam. Conversely, the smaller the dielectric constant, the weaker the water-richness.

[0072] The dielectric constants of common underground media and coal seams are shown in Table 1:

[0073] Table 1

[0074] Media Type Relative dielectric constant value range Air 1 water 81 coal 4-5 Dry sandstone 4 Water-bearing sandstone 25 Limestone 7

[0075] Among them, the relative dielectric constant describes the degree of polarization of any medium relative to air (vacuum) in an electric field. In other words, the relative dielectric constant is the ratio of the dielectric constant of a material to the dielectric constant of a vacuum. In an underground environment, by measuring the dielectric constant of a coal seam (i.e., the relative dielectric constant), we can effectively determine the water-richness of the coal seam, because the larger the dielectric constant, the higher the degree of polarization in the coal seam, and thus infer that the water-richness inside the coal seam is stronger.

[0076] The surface and underground combined water-richness calculation method applicable to coal mines provided by the present invention combines the surface direct current method and the underground radio electromagnetic wave perspective method, uses the surface direct current method to obtain the apparent conductivity, and uses the underground radio electromagnetic wave perspective method to obtain the attenuation coefficient, and the two are combined to calculate the dielectric constant of the coal seam, thereby determining the water-richness inside the coal seam. This method integrates the detection data of the surface and the underground, effectively suppresses false anomalies, reduces the multi-solution of the results, and thus improves the accuracy of the water-richness calculation.

[0077] In a preferred embodiment of the present invention, in step 12, obtaining the apparent conductivity of the coal seam by using the ground direct current sounding method specifically includes:

[0078] S121, arrange measuring points at the ground position corresponding to each receiving point to ensure that the DC depth inversion depth is greater than the coal seam burial depth;

[0079] In this embodiment, a DC sounding point is arranged at the ground position corresponding to each receiving point. For each receiving point in the underground radio electromagnetic wave perspective method, we find a corresponding position on the ground and arrange a DC sounding point at the position. The purpose of this is to ensure that the electrical measurement on the ground can correspond to the electromagnetic wave measurement underground, thereby providing more comprehensive coal seam information.

[0080] Ensuring that the DC sounding inversion depth is greater than the coal seam burial depth can ensure that the DC sounding method can detect the coal seam and the stratigraphic information beneath it, thereby ensuring the integrity and accuracy of the data.

[0081] S122, measuring the voltage and current values ​​of each measuring point.

[0082] S123, converting the normalized voltage of each measuring point with different pole distances into apparent resistivity.

[0083] Here, the normalized voltage is calculated using the measured voltage and current data. Normalized voltage refers to scaling the actually measured voltage value according to a certain standard or ratio for subsequent calculation and comparison.

[0084] The normalized voltage is converted to apparent resistivity using the following formula, which provides data support for the subsequent acquisition of formation resistivity distribution.

[0085] ρ s =K×V / I

[0086] In the formula, ρ s is the apparent resistivity, and K is the device coefficient related to the electrode distance.

[0087] S124, through inversion technology, using the apparent resistivity data of the measuring points, infer the apparent resistivity of strata at different depths to obtain the resistivity value of the depth of the coal seam.

[0088] Specifically, the inversion technique in this embodiment is a mathematical method that can estimate the properties of underground media based on surface observation data. During the inversion process, the influence of geological structure, lithology and other factors on resistivity needs to be considered to obtain a more accurate formation resistivity distribution.

[0089] The surface DC sounding method is to set up measuring points on the surface, emit DC current underground, and then measure the voltage and current data on the surface. The resistivity of the formation is calculated through the voltage and current data, and then the resistivity distribution at different depths is obtained. In this process, the resistivity value of the depth of the coal seam can be obtained, that is, the resistivity value of the coal seam depth.

[0090] S125, performing a reciprocal calculation on the resistivity value at the depth of the coal seam to obtain the apparent conductivity near the coal seam.

[0091] In this embodiment, the inverse calculation of the resistivity value of the coal seam depth is performed to obtain the apparent conductivity value near the coal seam. The apparent conductivity reflects the strength of the conductive properties of the strata near the coal seam. The apparent conductivity value obtained by the ground direct current method is one of the key parameters for calculating the dielectric constant of the coal seam.

[0092] Among them, apparent conductivity is a parameter used to reflect the change in conductivity of rocks and ores. Apparent conductivity and apparent resistivity are relative concepts, and there is a reciprocal relationship between them. Apparent resistivity is a parameter that reflects the change in conductivity of rocks and ores, while apparent conductivity is its reciprocal form. In the case of the existence of multiple rocks underground, both apparent resistivity and apparent conductivity are affected by the comprehensive influence of the resistivity and conductivity of various rocks, and are also related to specific conditions such as the distribution state of rocks and electrode arrangement.

[0093] It is understandable that the existing technology mainly relies on underground detection, which is greatly affected by the interference of the mine environment. However, the present invention reduces the interference of the underground environment by introducing the ground direct current depth sounding method, and enhances the environmental adaptability of the water-rich detection method.

[0094] Figure 3 The structural block diagram of the ground-underground combined water-richness calculation system for coal mines provided by the present invention is as follows: Figure 3 As shown, an embodiment of the present invention provides a ground-underground combined water-richness calculation system 300 applicable to coal mines, the system comprising:

[0095] An acquisition module 301 is used to acquire the electromagnetic wave field strength of the coal seam by using underground radio electromagnetic wave perspective method, and to acquire the apparent conductivity near the coal seam by using ground direct current sounding method;

[0096] An attenuation coefficient calculation module 302, used to calculate the attenuation coefficient according to the electromagnetic wave field strength;

[0097] A dielectric constant calculation module 303, used to calculate the dielectric constant of the coal seam according to the apparent conductivity and the attenuation coefficient;

[0098] The water-richness determination module 304 is used to determine the water-richness inside the coal seam according to the dielectric constant of the coal seam.

[0099] The surface and underground combined water-richness calculation system applicable to coal mines provided by the present invention is used to execute the surface and underground combined water-richness calculation methods applicable to coal mines provided by the above-mentioned embodiments through various modules. The surface and underground combined water-richness calculation methods applicable to coal mines have been described in detail in the above-mentioned embodiments, and will not be repeated in this embodiment.

[0100] Figure 4 The structural block diagram of the electronic device provided by the present invention is as follows: Figure 4As shown, the present invention also provides an electronic device, and the electronic device 400 can be a computing device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a server. The electronic device 400 includes a processor 401 and a memory 402, wherein the memory 402 stores a ground and underground combined water richness calculation program 403 applicable to coal mines.

[0101] In some embodiments, the memory 402 may be an internal storage unit of a computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory 402 may also be an external storage device of a computer device, such as a plug-in hard disk equipped on the computer device, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. Furthermore, the memory 402 may also include both an internal storage unit of a computer device and an external storage device. The memory 402 is used to store application software and various types of data installed on the computer device, such as program codes for installing the computer device. The memory 402 may also be used to temporarily store data that has been output or is to be output. In one embodiment, when the ground and underground combined water-richness calculation program 403 applicable to coal mines is executed by the processor 401, the following steps are implemented:

[0102] The electromagnetic wave field strength of the coal seam is obtained by underground radio electromagnetic wave perspective method, and the apparent conductivity near the coal seam is obtained by ground direct current sounding method;

[0103] Calculating the attenuation coefficient according to the electromagnetic wave field intensity;

[0104] The dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient;

[0105] The water richness inside the coal seam is determined based on the dielectric constant of the coal seam.

[0106] In some embodiments, the processor 401 can be a central processing unit (CPU), a microprocessor or other data processing chip, which is used to run the program code or process data stored in the memory 402, such as executing a ground and underground combined water richness calculation program applicable to coal mines.

[0107] This embodiment further provides a computer-readable storage medium, on which is stored a ground-underground combined water-richness calculation program applicable to coal mines. When the ground-underground combined water-richness calculation program applicable to coal mines is executed by a processor, the following steps are implemented:

[0108] The electromagnetic wave field strength of the coal seam is obtained by underground radio electromagnetic wave perspective method, and the apparent conductivity near the coal seam is obtained by ground direct current sounding method;

[0109] Calculating the attenuation coefficient according to the electromagnetic wave field intensity;

[0110] The dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient;

[0111] The water richness inside the coal seam is determined based on the dielectric constant of the coal seam.

[0112] In summary, the combined surface and underground water-richness calculation method and system for coal mines provided by the present invention have the following beneficial effects compared with the prior art:

[0113] 1) The present invention combines the ground direct current method and the underground radio electromagnetic wave perspective method, uses the ground direct current method to obtain the apparent conductivity, and uses the underground radio electromagnetic wave perspective method to obtain the attenuation coefficient. The two are combined to calculate the dielectric constant of the coal seam, and then determine the water richness inside the coal seam. This method integrates the detection data of the ground and the underground, effectively suppresses false anomalies, reduces the multi-solution of the results, and thus improves the accuracy of the water richness calculation.

[0114] 2) The existing technology mainly relies on underground detection, which is greatly affected by the interference of the mine environment. The present invention reduces the interference of the underground environment by introducing the ground DC depth sounding method and enhances the environmental adaptability of the water-rich detection method. The present invention combines two detection methods, taking into account both the electrical characteristics of the ground and the electromagnetic wave propagation characteristics of the underground, thereby providing more comprehensive detection information. Provide more powerful support for coal mining and safety.

[0115] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the combined water richness of ground and underground coal mines, characterized in that: include: The electromagnetic wave field strength of the coal seam is obtained by underground radio electromagnetic wave perspective method, and the apparent conductivity near the coal seam is obtained by ground direct current sounding method; Calculating the attenuation coefficient according to the electromagnetic wave field intensity; The dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient; The water richness inside the coal seam is determined based on the dielectric constant of the coal seam.

2. The combined surface and underground water-richness calculation method applicable to coal mines according to claim 1 is characterized in that: The method of obtaining the electromagnetic wave field strength of the coal seam by using the underground radio electromagnetic wave perspective method includes: A transmitting point and a receiving point are arranged in the tunnels on both sides of the coal mining working face; wherein the transmitting point is used to transmit radio electromagnetic wave signals, and the receiving point is used to receive electromagnetic wave signals penetrating the coal seam from the transmitting point; The electromagnetic wave field strength at each receiving point is obtained by underground radio electromagnetic wave perspective method.

3. The combined surface and underground water-richness calculation method applicable to coal mines according to claim 2 is characterized in that: The method of obtaining the apparent conductivity of the coal seam by using the ground direct current sounding method comprises: Set up measuring points at the ground position corresponding to each receiving point to ensure that the DC depth inversion depth is greater than the coal seam burial depth; Measure the voltage and current values ​​at each measuring point. Convert the normalized voltage of different pole distances at each measuring point into apparent resistivity; Through inversion technology, using the apparent resistivity data of the measuring points, the apparent resistivity of strata at different depths is inferred, and the resistivity value of the depth of the coal seam is obtained. The resistivity value at the depth of the coal seam is calculated inversely to obtain the apparent conductivity near the coal seam.

4. The combined surface and underground water-richness calculation method applicable to coal mines according to claim 1 is characterized in that: The calculating the attenuation coefficient according to the electromagnetic wave field intensity comprises: The attenuation coefficient is calculated using the following formula: Where α is the attenuation coefficient, H is the electromagnetic wave field strength, H0 is the initial radiation field strength, r is the distance between the transmitting point and the receiving point, and ψ is the angle between the antenna axis of the transmitting point and the direction of the test point in the electromagnetic wave.

5. The combined surface and underground water-richness calculation method applicable to coal mines according to claim 1 is characterized in that: The dielectric constant of the coal seam is calculated according to the apparent conductivity and the attenuation coefficient, including: The dielectric constant of coal seams is calculated by the following formula: in, Where ε is the dielectric constant of the coal seam, μ is the vacuum magnetic permeability, ω is the angular frequency, σ is the apparent conductivity, and α is the attenuation coefficient.

6. The combined surface and underground water-richness calculation method applicable to coal mines according to claim 1 is characterized in that: Determining the water-richness inside the coal seam according to the dielectric constant of the coal seam includes: The dielectric constant of the coal seam is positively correlated with the water-richness inside the coal seam. The larger the dielectric constant of the coal seam, the stronger the water-richness inside the coal seam.

7. A surface and underground combined water-richness calculation system applicable to coal mines used in the surface and underground combined water-richness calculation method applicable to coal mines as claimed in any one of claims 1 to 6, comprising: An acquisition module is used to obtain the electromagnetic wave field strength of the coal seam using the underground radio electromagnetic wave perspective method, and to obtain the apparent conductivity near the coal seam using the ground direct current sounding method; An attenuation coefficient calculation module, used to calculate the attenuation coefficient according to the electromagnetic wave field strength; A dielectric constant calculation module, used for calculating the dielectric constant of the coal seam according to the apparent conductivity and the attenuation coefficient; The water-richness determination module is used to determine the water-richness inside the coal seam based on the dielectric constant of the coal seam.

8. An electronic device, It is characterized in that comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the ground and underground combined water-richness calculation method applicable to coal mines as described in any one of claims 1 to 6 above.

9. A computer-readable storage medium, characterized in that: Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps of the ground-underground combined water-richness calculation method applicable to coal mines as described in any one of claims 1 to 6 above.

Images