Method for judging compaction degree of working face old roadway based on SF6 air leakage measurement

Abstract

The invention discloses a working face old roadway compaction degree evaluation method based on SF6 air leakage measurement, and relates to the field of compaction evaluation, and the method comprises the following steps: obtaining coal mine basic information, and setting a coal mine working face three-dimensional model; setting a corresponding release point and a plurality of detection points according to the coal mine working face three-dimensional model; setting the required release volume according to the release point position information, releasing the corresponding tracer gas, and obtaining the detection information of the tracer gas at each detection point position; carrying out visualization processing on the obtained detection information of the tracer gas; the visual processing results of the detection information corresponding to all the detection points are compared and analyzed, and corresponding air leakage measurement information is obtained; ventilation route information in the mine is obtained according to the air leakage measurement information obtained by all the detection points, analysis processing is conducted according to the ventilation route information, and compaction degree information corresponding to the old roadway information is obtained; the safety of the working face old roadway is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compaction evaluation, in particular to a working face old roadway compaction degree evaluation method based on SF6 air leakage determination. BACKGROUND

[0002] In the long-term mining process of coal mines, as the working face is continuously advanced, a large number of working face old roadways are left behind. The existence of these working face old roadways changes the original ventilation system and stress distribution state of the surrounding rock in the mine, and the compaction degree of the working face old roadway is directly related to the problems of underground ventilation safety, gas control efficiency, etc., and is one of the key factors affecting the safety production of coal mines. If the compaction degree of the old roadway is insufficient, an air leakage channel will be formed. Air leakage not only leads to a decrease in the effective air volume of the working face, affecting normal ventilation and reducing the air quality of the working face, but also may cause harmful gases and gas to accumulate inside, cause oxidation and spontaneous combustion in the local media of the coal seam, and increase the risk of safety accidents such as gas explosion.

[0003] After searching, the invention patent with Chinese patent number CN114034445A discloses a method and system for detecting air leakage channels to determine whether there is an air leakage channel between the lower adjacent layer and the coal seam. The method comprises: after releasing a mixed standard gas of helium and radon at a preset position of the lower adjacent layer of the coal mine according to a preset proportion, collecting air samples of each first sampling point of the working face of the coal seam according to a preset time interval; determining whether there is helium in the air samples collected by each first sampling point; when there is helium in the air sample, it is determined that there is an air leakage channel between the lower adjacent layer and the coal seam of the coal mine. By using the scheme provided in the present application, it can be determined whether there is an air leakage channel between the lower adjacent layer and the coal seam of the coal mine by determining whether there is helium in the sampling point of the working face of the coal seam, thereby realizing the detection of the air leakage channel between the lower adjacent layer and the coal seam of the coal mine.

[0004] Compared with the prior art, the invention patent with Chinese patent number CN114034445A determines whether there is an air leakage channel by determining whether there is helium in the sampling point of the working face of the coal seam, thereby improving the detection efficiency of the air leakage channel between the lower adjacent layer and the corresponding coal seam of the coal mine.

[0005] However, the above method has the disadvantages of insufficient accuracy and inability to obtain the compaction degree of the working face old roadway in the actual use process, which only detects the air leakage channel by a single air leakage channel detection. SUMMARY

[0006] The purpose of the present application is to solve the problem of insufficient accuracy in the prior art, and to provide a working face old roadway compaction degree evaluation method based on SF6 air leakage determination.

[0007] To achieve the above object, the present application adopts the following technical solutions: The working face old roadway compaction degree evaluation method based on SF6 air leakage determination includes the following steps: Step S1: Obtain coal mine basic information, analyze and process the coal mine basic information, set up a coal mine working face three-dimensional model, and update the coal mine working face three-dimensional model in real time; Step S2: According to the coal mine working face three-dimensional model, mark the corresponding air inlet end, air outlet end and old roadway information, and set up release points and multiple detection points according to the marking result; Step S3: Set the required release volume according to the release point position information, and release the corresponding volume of tracer gas according to the required release volume At each detection point, detect the appearance time information and appearance concentration information of the corresponding tracer gas ; Step S4: Visualize the appearance time information and appearance concentration information detected by each detection point, obtain the concentration trend curve and concentration average value of the tracer gas ; Step S5: According to the change trend curve and concentration average value corresponding to each detection point, compare and analyze in sequence, obtain the corresponding air leakage determination information, and map it to the coal mine working face three-dimensional model; Step S6: According to the air leakage determination information obtained by each detection point in the coal mine working visualization image, analyze and process the corresponding compaction degree information of the old roadway information.

[0008] The above technical solution further includes: the process of setting up a coal mine working face three-dimensional model includes: Set up an information input terminal, and let the corresponding staff obtain the corresponding coal mine basic information through the information input terminal, the coal mine basic information including mine basic information, working face information, traffic distribution information and spatial distribution information; Set up a three-dimensional space coordinate system, mark the coal mine basic information in the three-dimensional space coordinate system according to the mine basic information, working face information, traffic distribution information and spatial distribution information in sequence, integrate each marking result, and set up a coal mine working face three-dimensional model according to the integrated result.

[0009] Further, the process of setting up release points and multiple detection points includes: According to the coal mine working face three-dimensional model, obtain the traffic transportation information, the mined working face and the roadway layout in the mining area in the mine, and according to the position information of the mined working face and the roadway layout in the mining area, obtain and mark the old roadway information; Based on the transportation information of each old alley, obtain the corresponding air flow information, and set up the air intake and return ends according to the air flow information and the corresponding old alley information. Based on the regional information of the coal mine working face 3D model where the corresponding old roadway information is located, as well as the location information of the air intake and return air ends, the marking process is performed to obtain the 3D model of the old roadway layout of the working face. Based on the location distribution of the air intake end and the old alley information in the 3D model of the working face old alley, set up corresponding release points and multiple detection points.

[0010] Furthermore, the step involves releasing a corresponding volume of tracer gas based on the required release volume. The process includes: Based on the information about the old alleyway where the corresponding release points and detection points are connected in the 3D model of the old alleyway layout, tracer gas is set up. Required release volume Through formula To obtain the required release volume under the original support condition, the formula is given. For the data collected at the corresponding detection points within the test period The mean value of the gas, L is the tunnel length between the corresponding release point and the corresponding detection point, and S is the cross-sectional area of ​​the tunnel between the corresponding release point and the corresponding detection point.

[0011] Furthermore, the corresponding tracer gas is detected at each detection point. The process of obtaining information on the time of occurrence and the concentration of occurrence includes: When the required volume of tracer gas has been released at the release point. Then, portable [devices] were used at the corresponding testing points. The measuring instrument is used for testing; Based on portable The instrument records the corresponding detection results at the designated detection points, and the corresponding tracer gases are obtained based on the recorded results. The gas collection information includes the time of occurrence and the concentration of occurrence.

[0012] Furthermore, the acquisition of tracer gas The process of calculating the concentration trend curve and the average concentration over time includes: Set up a two-dimensional spatial coordinate system and assign the corresponding tracer gas obtained at each detection point. The corresponding gas collection information is mapped onto a two-dimensional spatial coordinate system to generate tracer gas. The corresponding trend curve of concentration information with respect to the occurrence time information; The corresponding trend curves are analyzed to obtain the tracer gas collected at each detection point within the corresponding trend curve. The average concentration.

[0013] Furthermore, the process of obtaining the corresponding air leakage measurement information includes: The change trend curves obtained from each detection point are used to obtain the corresponding air leakage velocity information based on the corresponding roadway information. Through formula Obtain the air leakage velocity information of the goaf area at the corresponding detection point, where, Length of streamline, To trace the gas From the start of release at the corresponding release point to the detection of tracer gas at the corresponding detection point. The time interval; The tracer gas was collected based on the trend curves corresponding to each detection point. The occurrence time information, occurrence concentration information and corresponding leakage wind speed information are compared and analyzed in sequence. Based on the comparison and analysis results, ventilation route analysis is performed to obtain ventilation route information. The ventilation route information corresponding to each detection point and the information corresponding to each trend curve are marked as air leakage measurement information, and the air leakage measurement information is mapped to the corresponding position of the three-dimensional model of the old roadway layout in the working face.

[0014] Furthermore, the process of obtaining the compaction information corresponding to the old alley information includes: Leakage measurement information was obtained from various detection points within the 3D model of the old roadway layout at the working face. Based on the corresponding trend curves of each detection point, the appropriate tracer gas was obtained. Detection and collection volume Based on the corresponding detection and collection volume, the formula is used. Obtain the compaction degree of the old alleyway corresponding to the information of the old alleyway between the corresponding detection point and the release point. ; Obtain the compaction degree of the old alleyway and the corresponding ventilation route information for each detection point, and then use the ventilation route information and the tracer gas at each detection point. The occurrence time information, occurrence concentration information, and corresponding air leakage velocity information are used to comprehensively correct the compaction information of the corresponding old alley information to obtain the compaction information corresponding to the old alley information.

[0015] The present invention has the following beneficial effects: 0、The present application, by setting the corresponding release point and detection point according to the distribution of the corresponding working face old roadway in the mine, analyzing and processing the old roadway information between the release point and the detection point, obtaining the required release volume of the tracer gas required to be released by the corresponding release point, releasing the corresponding amount of tracer gas according to the required release volume , thereby ensuring the accuracy of the corresponding air leakage measurement information in each old roadway information, improving the utilization rate of the corresponding tracer gas in the measurement process , and avoiding resource waste.

[0016] 1、The present application, by analyzing and processing the tracer gas collected by each detection point, obtaining the corresponding change trend curve, judging the ventilation route information in the corresponding mine according to the change trend information, and comprehensively analyzing the corresponding air leakage measurement information according to the obtained ventilation route information, the specific air leakage measurement situation in each old roadway information can be judged, which can improve the accuracy in the working face old roadway compaction evaluation process to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The flowchart of the working face old roadway compaction degree evaluation method based on SF6 air leakage measurement proposed by the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] Embodiment one As shown in the figure, the working face old roadway compaction degree evaluation method based on SF6 air leakage measurement proposed by the present application includes the following steps: Figure 1 Step S1: Obtain the coal mine basic information, analyze and process the coal mine basic information, set up the coal mine working face three-dimensional model, and update the coal mine working face three-dimensional model in real time; Step S2: According to the coal mine working face three-dimensional model, mark the corresponding air inlet end, air outlet end and old roadway information, and set the release point and multiple detection points according to the marking result; Step S3: Set the required release volume according to the release point position information, release the corresponding volume of tracer gas according to the required release volume , and detect the corresponding tracer gas at each detection point position . ​appearance time information and appearance concentration information of the tracer gas; Step S4: visualizing the appearance time information and appearance concentration information detected by each detection point to obtain the tracer gas concentration trend curve and concentration average value over time; Step S5: sequentially comparing and analyzing the change trend curve and concentration average value corresponding to each detection point to obtain corresponding air leakage measurement information and map it into the coal face three-dimensional model; Step S6: analyzing and processing the air leakage measurement information obtained by each detection point in the coal mine visualization image to obtain the compaction degree information corresponding to the old roadway information.

[0020] As described in steps S1 to S6 above, the present application sets a coal face three-dimensional model by corresponding coal mine basic information, sets corresponding release points and detection points in the coal face three-dimensional model according to the corresponding face space layout, and releases a corresponding amount of tracer gas at the release points and detects the amount at each detection point for statistical analysis to determine the ventilation route information in the mine, comprehensively analyze the corresponding air leakage measurement information according to the ventilation route information, and thus obtain the compaction degree information of the corresponding old roadway information, which can improve the accuracy in the compaction judgment process of the corresponding face old roadway to a certain extent, and improve the utilization rate of the tracer gas during the measurement process, avoiding resource waste; in addition, the tracer gas used in this process is a colorless and odorless gas with a melting point of -62℃ and a boiling point of -51℃, a molecular weight of 146.05, a density of 5.11 times that of air, and stable chemical properties. Sulfur hexafluoride is used as a tracer gas because

[0021] In the specific implementation process, the step S1 of obtaining coal mine basic information, analyzing and processing the coal mine basic information, setting a coal face three-dimensional model, and updating the coal face three-dimensional model in real time includes the following steps: S11: setting an information input terminal, obtaining corresponding coal mine basic information by corresponding staff through the information input terminal, and the coal mine basic information includes mine basic information, face information, traffic distribution information, and space distribution information; S12: setting a three-dimensional space coordinate system, marking the coal mine basic information in the three-dimensional space coordinate system according to the mine basic information, the working face information, the traffic distribution information and the spatial distribution information in turn, integrating the marking results, and setting a coal mine working face three-dimensional model according to the integration result; It needs to be further explained that, as described in the above steps S11 to S12, the corresponding coal mine basic information is marked and integrated to set the corresponding coal mine working face three-dimensional model, the position information of the working face old roadway to be analyzed and processed is obtained through the corresponding coal mine working face three-dimensional model, and the visualization processing is performed according to the corresponding position information, thereby improving the convenience in the data analysis process.

[0022] In the specific implementation process, the step S2 of setting the release point and the plurality of detection points according to the marking processing of the air inlet end, the air outlet end and the old roadway information obtained from the coal mine working face three-dimensional model includes the following steps: S21: obtaining the traffic transportation information, the mined working face and the roadway layout in the mining area in the mine according to the coal mine working face three-dimensional model, and marking the mined working face and the roadway layout as old roadway information according to the position information thereof; S22: obtaining the corresponding air flow information according to the traffic transportation information where each old roadway information is located, and setting the air inlet end and the air outlet end according to the air flow information and the corresponding old roadway information; S23: marking processing according to the region information of the coal mine working face three-dimensional model where the corresponding old roadway information is located and the position information of the air inlet end and the air outlet end, and obtaining a working face old roadway layout three-dimensional model; S24: setting the corresponding release point and the plurality of detection points according to the position distribution of the corresponding air inlet end and the old roadway information in the working face old roadway layout three-dimensional model; It needs to be further explained that, as described in the above steps S21 to S24, in the process of setting the air inlet end and the air outlet end for the corresponding old roadway information, the main old roadway information to be determined is determined in priority through discussion and connection with the mine professional and technical personnel, and the old roadway information includes but is not limited to the roadway length, the roadway cross-sectional area, the support structure information, the roadway connection information and other information; a plurality of detection points are set according to the corresponding old roadway information, and the number of detection points is not less than 2, thereby ensuring the accuracy in the corresponding air leakage determination process in the old roadway information.

[0023] In the specific implementation process, the required release volume is set according to the release point position information, and the corresponding volume of tracer gas is released according to the required release volume The corresponding tracer gas is detected at the position of each detection point Step S3, which provides information on the time of occurrence and the concentration of occurrence, includes the following steps: S31: Based on the information of the old roadway connecting the corresponding release points and detection points in the 3D model of the old roadway layout, set the tracer gas. Required release volume ; S32: When the required volume of tracer gas has been released at the release point. Then, portable [devices] were used at the corresponding testing points. The measuring instrument is used for testing; S33: Based on portable The instrument records the corresponding detection results at the designated detection points, and the corresponding tracer gases are obtained based on the recorded results. The gas collection information includes occurrence time information and occurrence concentration information; In the specific implementation of step S31 above, since the air volume in the old tunnel is unknown, it is assumed that the working face of the old tunnel between the release point and the corresponding detection point maintains its original support state, and the formula is used to... To obtain the required release volume under ideal conditions from the original support state, the formula is given. For the data collected at the corresponding detection points within the test period The mean value of the gas, L is the tunnel length between the corresponding release point and the corresponding detection point, and S is the cross-sectional area of ​​the tunnel between the corresponding release point and the corresponding detection point. It should be further explained that, in the specific implementation process, the required release volume at the corresponding release point is calculated by working backward using extreme thinking, and the corresponding amount of tracer gas is released based on the required release volume obtained at the release point. By employing a single total release method, the accuracy of leakage measurement information obtained from each old alleyway can be ensured, while also improving the accuracy of the corresponding tracer gas during the measurement process. This maximizes utilization and avoids resource waste; once all gas has been released from the release point, the personnel at the monitoring point are notified using underground explosion-proof communication facilities to prepare for observation; and portable... During the testing process, the observation hole at the corresponding test point is connected to the corresponding portable device. The measuring instrument is aligned and connected, or a portable device is used. The instrument's detection port is placed horizontally in the air at the detection point, facing directly towards the airflow. When the instrument emits an alarm, it indicates that tracer gas has been detected. And record the instrument data.

[0024] In the specific implementation process, the occurrence time information and occurrence concentration information detected at each detection point are visualized to obtain the tracer gas. The concentration trend curve and the concentration average value changing with time step S4 comprises the following steps: S41: Set a two-dimensional spatial coordinate system, and map the gas collection information corresponding to the tracer gas obtained by each detection point to the two-dimensional spatial coordinate system to generate the tracer gas concentration trend curve corresponding to each detection point. The corresponding gas collection information is mapped to the two-dimensional spatial coordinate system to generate the tracer gas The concentration trend curve corresponding to the concentration information about the occurrence time information is generated. S42: According to the corresponding change trend curve, the concentration average value of the corresponding tracer gas collected in the change trend curve corresponding to each detection point is obtained. It needs to be further explained that, as described in steps S41 and S42 above, by mapping the obtained tracer gas corresponding gas collection information to the two-dimensional spatial coordinate system, the corresponding change trend curve is obtained, and the change trend curve is set to facilitate subsequent analysis and processing of the goaf air leakage rule corresponding to the working face old roadway information, which can improve the accuracy in the air leakage measurement process and improve the analysis efficiency in the air leakage measurement process to a certain extent.

[0025] In the specific implementation process, the step S5 of sequentially comparing and analyzing the change trend curve and the concentration average value corresponding to each detection point, obtaining the corresponding air leakage measurement information, and mapping the air leakage measurement information to the three-dimensional model of the coal mine working face comprises the following steps: S51: Obtain the change trend curve corresponding to each detection point, and obtain the corresponding air leakage wind speed information according to the corresponding roadway information ; S52: According to the occurrence time information, occurrence concentration information and corresponding air leakage wind speed information of the tracer gas collected according to the change trend curve corresponding to each detection point, sequentially compare and analyze, analyze the ventilation route according to the comparison and analysis result, and obtain the ventilation route information; S53: Mark the ventilation route information corresponding to each detection point and the information corresponding to each change trend curve as air leakage measurement information, and map the air leakage measurement information to the corresponding position of the working face old roadway layout three-dimensional model; The specific implementation process of the above step S51 is to obtain the air leakage wind speed information of the working face goaf corresponding to the detection point by the formula , wherein is the streamline length, is the time interval from the start of release of the tracer gas at the corresponding release point to the detection of the tracer gas at the corresponding detection point; The specific implementation process of the above step S52 is to sequentially compare and analyze the occurrence time information, occurrence concentration information and corresponding air leakage wind speed information of the tracer gas The appearance time information of the tracer gas is sorted according to the corresponding time axis, the ventilation route information between the corresponding working face old roadways is obtained according to the sorting result, in addition, in the process of analyzing the corresponding ventilation route information, the corresponding air volume data when reaching the corresponding detection point is obtained by analyzing and processing the influence of corresponding factors such as air resistance, roadway turning, variable diameter, material equipment occupation in the corresponding old roadway information; the air volume data corresponding to the position information of each detection point is marked and processed; The specific implementation process of the above step S53 is that the change trend curves corresponding to each detection point are respectively mapped into the same coordinate system, the tracer gas The trend information presented as a whole over time, that is, the trend of first increasing and then decreasing, is analyzed according to the time axis, the tracer gas The detection values of the corresponding detection points appearing in the corresponding time interval after the release at the corresponding release point and the peak information of the tracer gas concentrations reaching the corresponding detection points are analyzed according to the air flow direction corresponding to the ventilation route information, and the tracer gas leakage air path information in the working face goaf, and the leakage air path information is mapped in the working face old roadway arrangement three-dimensional model to obtain a corresponding leakage air schematic diagram; the leakage air speed information corresponding to each detection point is obtained, and the leakage air speed information is statistically analyzed according to the distribution of the position information to obtain the leakage air determination information in the corresponding working face old roadway.

[0026] In the specific implementation process, the step S6 of analyzing and processing the leakage air determination information obtained from each detection point in the coal mine working visual image to obtain the compaction degree information corresponding to the corresponding old roadway information comprises the following steps: S61: obtaining the leakage air determination information obtained from each detection point in the working face old roadway arrangement three-dimensional model, obtaining the corresponding tracer gas detection and collection volume from each detection point according to the corresponding detection and collection volume by the formula to obtain the old roadway compaction degree corresponding to the old roadway information between the corresponding detection point and the release point; S62: obtaining the old roadway compaction degree corresponding to each detection point and the corresponding ventilation route information, and comprehensively correcting the old roadway compaction degree information corresponding to the corresponding old roadway information according to the ventilation route information, the appearance time information, the appearance concentration information of the tracer gas from each detection point and the corresponding leakage air speed information, to obtain the compaction degree information corresponding to the corresponding old roadway information; It needs to be further explained that, in the above steps S61 to S62, according to the detection collection volume collected by each detection point, the old roadway compaction degree information corresponding to the old roadway information between the corresponding detection point and the release point is judged, in the process of comprehensive correction processing of each old roadway compaction degree information, according to the position information and the ventilation route information of the corresponding working face old roadway in the mine, the correction processing is carried out, in order to improve the accuracy of the compaction degree information corresponding to the corresponding old roadway information, according to the ventilation route information, the old roadway compaction degree information obtained by the last detection point information is sequentially taken as the old roadway compaction degree information obtained by the next detection point information adjacent to it as the correction basis, according to the appearance time information, the appearance concentration information and the corresponding air leakage wind speed information of the tracer gas of each detection point , the detection collection volume and the required release volume of the corresponding old roadway information are corrected, the old roadway compaction degree information obtained at the corresponding detection point is sequentially corrected, so as to improve the accuracy in the process of judging the old roadway compaction degree of the corresponding working face.

[0027] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for judging the compaction degree of an old roadway of a working face based on SF6 air leakage measurement, characterized in that, The method comprises the following steps: Step S1: obtaining coal mine basic information, analyzing and processing the coal mine basic information, setting a coal mine working face three-dimensional model, and updating the coal mine working face three-dimensional model in real time; Step S2: marking the corresponding air inlet end, air outlet end and old roadway information according to the coal mine working face three-dimensional model, and setting a release point and a plurality of detection points according to the marking result; Step S3: setting a required release volume according to the release point position information, releasing a corresponding volume of tracer gas according to the required release volume detecting the occurrence time information and occurrence concentration information of the corresponding tracer gas at each detection point position ​ Step S4: visualizing the time-of-occurrence information and the concentration-of-occurrence information detected by each detection point to obtain a trace gas trend curve of the concentration change over time and the concentration average value; Step S5: comparing and analyzing the change trend curve and the concentration average value corresponding to each detection point in sequence, obtaining corresponding air leakage measurement information, and mapping the air leakage measurement information into the coal mine working face three-dimensional model; Step S6: analyzing and processing the air leakage measurement information obtained by each detection point in the coal mine working visualization image, and obtaining the compaction degree information corresponding to the old roadway information.

2. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 1, characterized in that, The process of setting the coal mine working face three-dimensional model comprises: setting an information input terminal, and obtaining the corresponding coal mine basic information by the corresponding staff through the information input terminal, wherein the coal mine basic information comprises mine basic information, working face information, traffic distribution information and spatial distribution information; setting a three-dimensional space coordinate system, marking the coal mine basic information in the three-dimensional space coordinate system in sequence according to the mine basic information, the working face information, the traffic distribution information and the spatial distribution information, integrating the marking results, and setting the coal mine working face three-dimensional model according to the integrated result.

3. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 2, characterized in that, The process of setting the release point and the plurality of detection points comprises: obtaining the traffic transportation information, the mined working face and the roadway layout in the mining area in the mine according to the coal mine working face three-dimensional model, obtaining and marking the old roadway information according to the position information of the mined working face and the roadway layout in the mining area; obtaining the corresponding air flow information according to the traffic transportation information where each old roadway information is located, and setting the air inlet end and the air outlet end according to the air flow information and the corresponding old roadway information; marking the position information of the coal mine working face three-dimensional model and the position information of the air inlet end and the air outlet end according to the corresponding old roadway information, obtaining a working face roadway layout three-dimensional model; setting the corresponding release point and the plurality of detection points according to the position distribution of the corresponding air inlet end and the old roadway information in the working face roadway layout three-dimensional model.

4. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 3, characterized in that, releasing a corresponding volume of tracer gas according to the required release volume the process comprises: Based on the information about the old alleyway where the corresponding release points and detection points are connected in the 3D model of the old alleyway layout, tracer gas is set up. Required release volume Through formula To obtain the required release volume under the original support condition, the formula is given. For the data collected at the corresponding detection points within the test period The mean value of the gas, L is the tunnel length between the corresponding release point and the corresponding detection point, and S is the cross-sectional area of ​​the tunnel between the corresponding release point and the corresponding detection point.

5. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 4, characterized in that, The corresponding tracer gas is detected at each detection point. The process of obtaining information on the time of occurrence and the concentration of occurrence includes: when the release point has released the required release volume of tracer gas Afterwards, the portable detector is used at the corresponding detection points for detection meter Based on portable The instrument records the corresponding detection results at the designated detection points, and the corresponding tracer gases are obtained based on the recorded results. The gas collection information includes the time of occurrence and the concentration of occurrence.

6. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 5, characterized in that, The acquisition of the tracer gas The process of the concentration change trend curve and the concentration average value includes: A two-dimensional spatial coordinate system is set up, and the corresponding tracer gas concentration information obtained by each detection point is mapped into the two-dimensional spatial coordinate system to generate a tracer gas concentration information map. The corresponding gas collection information is mapped into the two-dimensional spatial coordinate system to generate a tracer gas concentration information map. A curve showing the change trend of the tracer gas concentration information with respect to the appearance time information. According to the corresponding change trend curve, the concentration average of the corresponding tracer gas collected in the change trend curve corresponding to each detection point is obtained. the concentration average of the corresponding tracer gas collected in the change trend curve corresponding to each detection point is obtained.

7. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 6, characterized in that, The process of obtaining the corresponding air leakage measurement information comprises: The change trend curve obtained by each detection point is used to obtain corresponding air leakage wind speed information according to corresponding roadway information , and the air leakage wind speed information of the working face goaf of the corresponding detection point is obtained through a formula , wherein, is the streamline length, is the time interval from the start of release at the corresponding release point to the detection of the tracer gas at the corresponding detection point, is the time interval from the start of release at the corresponding release point to the detection of the tracer gas at the corresponding detection point. The tracer gas was collected based on the trend curves corresponding to each detection point. The occurrence time information, occurrence concentration information and corresponding leakage wind speed information are compared and analyzed in sequence. Based on the comparison and analysis results, ventilation route analysis is performed to obtain ventilation route information. marking the ventilation route information corresponding to each detection point and the information corresponding to each change trend curve as the air leakage measurement information, and mapping the air leakage measurement information to the corresponding position of the working face roadway layout three-dimensional model.

8. The working face old roadway compaction degree evaluation method based on SF6 air leakage measurement of claim 7, characterized in that, The process of obtaining the compaction degree information corresponding to the corresponding old roadway information comprises: Leakage measurement information was obtained from various detection points within the 3D model of the old roadway layout at the working face. Based on the corresponding trend curves of each detection point, the appropriate tracer gas was obtained. Detection and collection volume Based on the corresponding detection and collection volume, the formula is used. Obtain the compaction degree of the old alleyway corresponding to the information of the old alleyway between the corresponding detection point and the release point. ; The old roadway compaction degree corresponding to each detection point and corresponding ventilation route information are acquired, and the old roadway compaction degree information corresponding to the corresponding old roadway information is comprehensively corrected according to the ventilation route information and the appearance time information, the appearance concentration information of the tracer gas of each detection point and the corresponding air leakage wind speed information, so as to acquire the compaction degree information corresponding to the corresponding old roadway information. The old roadway compaction degree corresponding to each detection point and corresponding ventilation route information are acquired, and the old roadway compaction degree information corresponding to the corresponding old roadway information is comprehensively corrected according to the ventilation route information and the appearance time information, the appearance concentration information of the tracer gas of each detection point and the corresponding air leakage wind speed information, so as to acquire the compaction degree information corresponding to the corresponding old roadway information.

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