Comprehensive treatment method and system for enrichment and standard exceeding of radon gas in deeply-buried underground cavern

Abstract

The invention provides a deep underground cavern radon gas enrichment standard exceeding comprehensive treatment method and system, and the method comprises the steps: 1, collecting the original data of a to-be-treated cavern, and obtaining the monitoring data; step 2, constructing a temperature-seepage-stress-radon transport multi-field coupling numerical simulation model to carry out temperature-seepage-stress-radon transport multi-field coupling numerical simulation on the to-be-treated cavern and the surrounding area; 3, determining a radon gas enrichment area and enrichment degree of the cavern based on a numerical simulation result in combination with field investigation, and determining radon gas enrichment reasons; step 4, taking corresponding radon gas treatment measures based on the acquired radon gas enrichment reasons; and step 5, radon gas monitoring is carried out on the radon gas enrichment area of the cavern, if the standard is met, treatment is completed, and if the standard is not met, the step 3 is returned until the standard is met. According to the method, the radon gas distribution characteristics and the evolution law of the cavern can be determined, comprehensive optimization treatment measures are adopted, the treatment effect is improved, and the design and maintenance cost of the deeply-buried underground cavern is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of radon gas treatment, and in particular relates to a comprehensive treatment method and system for excessive radon gas enrichment in a deep underground cavern. Background Art

[0002] As underground caverns develop towards deeper, larger spans, and stronger enclosures, the deep rock mass environmental characteristics (such as high ground stress, limited ventilation, and complex geological conditions) have also brought new safety hazards, among which radon ( 222 The enrichment of Rn) in deeply buried underground caverns (groups) is particularly prominent, which may pose a threat to the health of construction workers, project safety and even long-term operation and maintenance.

[0003] radon( 222 Radon (Rn) is a colorless and odorless inert gas, which is a decay product of the natural radioactive system of uranium and radium. Radon and its progeny enter the human body (mainly the exhalation organ) through the human breathing process, and is currently the second largest culprit of human lung cancer after cigarettes.

[0004] At present, the main treatment method for excessive radon gas in underground caverns (groups) is exhaust. The high-concentration radon gas in the caverns (groups) is discharged outdoors through regular exhaust, and the rock wall of the caverns (groups) is sealed with shotcrete to inhibit the precipitation of radon to a certain extent. However, as the scale and burial depth of underground caverns (groups) continue to increase, the required exhaust system is becoming more and more complex, and when the height difference of the caverns (groups) increases, the exhaust effect will be weakened. This method only treats from the perspective of accelerating radon discharge, and its treatment effect is often not guaranteed for large-scale caverns (groups). For deeply buried caverns, there is also a "waterproof radon suppression" scheme to treat excessive radon gas from the perspective of suppressing radon precipitation. It mainly prevents the radon gas from being precipitated from rocks and the infiltration of radon-containing groundwater into the caverns (groups). However, this technology is currently only used in underground laboratories. Although it can effectively inhibit the release of radon from underground caverns (groups), it is relatively costly and is not suitable for underground caverns (groups) for large-scale engineering purposes. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to provide a comprehensive treatment method and system for excessive radon gas enrichment in deep underground caverns.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern comprises the following steps: Step 1. Collect the original data of the cavern to be treated, and set up monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; Step 2. Based on the original data collected in step 1, a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model is constructed to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and surrounding areas; Step 3. Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and combined with on-site investigation, determine the radon enrichment area and enrichment degree of the cavern, analyze the temporal and spatial distribution of radon enrichment, and determine the cause of radon enrichment; Step 4. Based on the radon gas enrichment reasons obtained in step 3, corresponding radon gas control measures are taken; Step 5. After taking control measures, monitor radon gas in the radon-enriched area of ​​the cave. If the standard is met, the control is completed. If not, return to step 3 until the standard is met.

[0007] Furthermore, the original data in step 1 include: regional geological data, cavern construction data, hydrogeological data and meteorological data.

[0008] Furthermore, the monitoring data in step 1 include: temperature, humidity, surrounding rock strain and radon concentration.

[0009] Furthermore, the construction of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation model in step 2 includes: Based on the regional geological data and the cavern construction data, the cavern is three-dimensionally modeled; the strata are divided by Boolean operation; the strata are imported into the numerical simulation software; and the mechanical parameters of the rock and soil mass and the parameters of the support materials are determined; Assign parameters to each rock layer and support structure based on the mechanical parameters of the rock and soil mass and the parameters of the support materials; The thermodynamic boundary of the model is set according to the temperature data; the groundwater seepage boundary is set according to the rainfall and groundwater level data; the air seepage boundary of the cavern is set according to the air pressure data; the bottom is set as a fixed boundary constraint, and the left, right, front and back vertical boundaries are set as roller supports; the cavern wall is set as a radon release source, and the inlet and outlet are set as open boundaries; The gas seepage velocity field in the cavern, the groundwater seepage field in the surrounding rock, the temperature field, the humidity field and the rock stress-strain field are calculated; the gas seepage velocity field is used as the transmission field of radon to realize the coupling of radon and gas seepage, the diffusion coefficient of radon is set as a function of temperature and humidity to realize the coupling of radon with temperature and humidity, the radon release rate is set as a function of rock damage and deformation to realize the coupling of rock damage and radon release, the groundwater seepage field is used as the transmission field of radon in the surrounding rock, and the conversion and balance of groundwater radon and cavern gas radon are realized through Henry's law, realizing the coupling of groundwater seepage and cavern radon concentration. Furthermore, in step 2, the pore pressure gradient, seepage velocity vector, plastic strain cloud map, and humidity temperature field evolution of the radon gas enriched area are obtained based on the temperature-seepage-stress-radon migration multi-field coupled numerical simulation model.

[0010] Furthermore, the step 2 further comprises: The results of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation will be compared and verified with the monitoring data to optimize the setting of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation model.

[0011] Furthermore, the reasons for radon gas enrichment in step 3 include: radon release, radon migration and radon retention.

[0012] Furthermore, in step 3, radon release is affected by the degree of rock deformation and damage, radon migration is affected by the seepage field, humidity and temperature, and radon retention is affected by the air circulation of the cavern.

[0013] Furthermore, in step 4, if radon is released, damage and deformation control measures are taken; if radon is migrated, drainage and anti-seepage or dehumidification and temperature control measures are taken; if radon is retained, extraction system or wall adsorption measures are taken.

[0014] On the other hand, the present invention provides a comprehensive treatment system for excessive radon gas enrichment in a deep underground cavern, comprising: Data collection module. It is used to collect the original data of the cavern to be treated, and set monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; Numerical simulation module. It is used to build a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model based on the original data collected in the experiment, and to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and the surrounding area; Enrichment cause judgment module. It is used to determine the radon enrichment area and enrichment degree of the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation and combined with on-site investigation, and analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment; A control measure selection module is used to take corresponding radon gas control measures based on the radon gas enrichment reasons obtained in the above; Treatment effect evaluation module. It is used to monitor radon gas in radon-enriched areas of the cavern after taking treatment measures. If the standards are met, the treatment is completed. If not, it returns to the numerical simulation module until the standards are met.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts numerical simulation means, which can provide an intuitive and comprehensive understanding of the temporal and spatial distribution characteristics of radon gas in deep underground caverns (groups) in advance, and conduct simulation and regulation in advance. For large-scale underground caverns (groups), it avoids the possible generalization of in-situ monitoring; 2. In terms of control strategy, the present invention analyzes the internal and external factors that affect regional radon enrichment from the perspective of the entire life cycle of radon gas generation-release-migration-retention, takes targeted control measures, and conducts comprehensive control of radon enrichment in deep underground caverns (groups) to improve the control effect; 3. The present invention can avoid the use of complex exhaust and dehumidification systems and high-cost radon suppression solutions through numerical simulation and comprehensive management strategies, and reduce the design difficulty and subsequent maintenance costs of deep underground caverns (groups); BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a method flow chart of an embodiment of the present invention; Figure 2 It is a schematic diagram of the treatment measures of an embodiment of the present invention.

[0017] 1. Cavern surrounding rock; 2. Lining; 3. Temperature, humidity and radon concentration monitoring system; 4. Anchoring measures; 5. Grouting measures; 6. Exhaust system; 7. Air conditioning; 71. Exhaust duct; 8. Dehumidifier; 81. Sealed drainage pipe; 9. Anti-seepage adsorption layer; 10. Drainage channel; 11. Drainage hole; 12. Waterproof curtain; 13. Drainage gallery; 14. Water level before treatment; 15. Water level after treatment; 16. Radial cracks; 17. Normal cracks. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below. Example 1 like Figure 1 As shown, the embodiment of the present invention provides a comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern group, comprising the following steps: Step 1. Collect the original data of the cavern to be treated, and set up monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; The original data in step 1 include: regional geological data, cavern construction data, hydrogeological data and meteorological data. The monitoring data include: temperature, humidity, surrounding rock strain and radon concentration.

[0019] In this embodiment, the geological structure and ground stress distribution characteristics of the A cavern area are investigated to investigate whether there are faults, earthquakes, and magma activities; the topographic data of the deep-buried cavern is obtained by means of three-dimensional laser scanning, radar, etc.; then, based on the construction data of the cavern, the burial depth, shape, and lithology distribution of the cavern surrounding rock 1 are determined; with the help of local survey data and drilling data, hydrological data such as the groundwater level in the cavern area, regional groundwater recharge and outflow, and rock mass water content are found; meteorological data such as the temperature and precipitation in the cavern area are collected; at the same time, a temperature, humidity, and radon concentration monitoring system 3 is deployed to record the temperature, humidity, surrounding rock strain, and radon concentration data at points a, b, and c in the A cavern over a period of time.

[0020] Step 2. Based on the original data collected in step 1, a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model is constructed to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and surrounding areas; In this embodiment, the hydrogeological units of cavern A and the surrounding area are divided and modeled. According to the terrain and the design parameters of cavern A, three-dimensional modeling is performed in the modeling software, and the strata are divided by Boolean operation according to the stratum distribution data; and the model is imported into the numerical simulation software; with the help of in-situ tests, indoor tests and design data, the mechanical parameters of the rock and soil (elastic modulus, Poisson's ratio, density, compressive / tensile strength, internal friction angle, cohesion, thermal conductivity, permeability, etc.) and the parameters of the support materials (elastic modulus, Poisson's ratio, yield strength of concrete / steel) are determined; according to the mechanical parameters of the rock and soil and the parameters of the support materials, parameters are assigned to each rock layer and support structure; The thermodynamic boundary of the model was set according to the temperature data of the A cave area; the seepage boundary of the model was set according to the rainfall and groundwater level data; the gas seepage boundary of the A cave was set according to the air pressure data; and the bottom of the A cave model was set as a fixed boundary constraint, and the left, right, front and back vertical boundaries were set as roller supports; the wall of the A cave was set as a radon release source, and the inlet and outlet were set as open boundaries; Consider the influence of temperature, humidity, seepage and rock damage on radon release and migration: calculate the gas seepage field of chamber A, the groundwater seepage field of the surrounding rock of chamber A, the temperature field, humidity field and rock stress and strain field through boundary conditions; take the gas seepage velocity field as the transmission field of radon to realize the coupling of radon and gas seepage, set the diffusion coefficient of radon as a function of temperature and humidity to realize the coupling of radon with temperature and humidity, set the radon release rate as a function of rock damage and deformation to realize the coupling of rock damage and radon release, take the groundwater seepage field as the transmission field of radon in the surrounding rock, and realize the conversion and balance of groundwater radon in the A chamber area and gas radon in the A chamber through Henry's law to realize the coupling of groundwater seepage and chamber radon concentration; The temperature, humidity, surrounding rock strain and radon concentration data at points a, b and c in the numerical simulation results are extracted and compared with the monitoring data at points a, b and c in cave A in the corresponding time period. If the error between the simulation data and the monitoring data is less than 5%, the simulation results are considered reliable; if the error is large, the model needs to be further adjusted and optimized to control the error within the allowable range.

[0021] Step 3. Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and combined with on-site investigation, determine the radon enrichment area and enrichment degree of the cavern, analyze the temporal and spatial distribution of radon enrichment, and determine the cause of radon enrichment; In this example, the numerical simulation results are analyzed and according to the national standard, the radon concentration in the A cave is greater than 400 Bq / m 3 The specific time period area is considered to be the radon gas enrichment area in the cavern; according to the seepage field evolution, deformation damage characteristics, temperature field evolution and humidity distribution characteristics of the radon gas enrichment area, the pore pressure gradient, seepage velocity vector, plastic strain cloud map, temperature and temperature contour map of the numerical simulation of the area are analyzed, and the cause of radon gas enrichment is determined in combination with on-site investigation.

[0022] Step 4. Based on the radon gas enrichment reasons obtained in step 3, corresponding radon gas control measures are taken; In this embodiment, according to the enrichment reasons of each radon gas enrichment area in the A cave, by adjusting the temperature, humidity, surrounding rock stress and strain and other parameters of the A cave, numerical simulation is performed again to achieve that the radon concentration of each radon enrichment area in the A cave in the numerical simulation is lower than the required standard. At this time, the temperature, humidity, groundwater level or surrounding rock stress and strain and other parameters of the A cave are the reference standards for the control measures. Combined with the on-site investigation, the relevant parameters of the A cave are controlled to meet the reference standards of the simulation by setting up drainage and anti-seepage facilities, damage and deformation control facilities, temperature and humidity control facilities, wall adsorption facilities and pumping systems and other comprehensive measures, so as to achieve the suppression of radon release, radon migration and radon retention; like Figure 2As shown, if radon is released, that is, rock deformation damage caused by high stress, a large amount of radon gas is released from the rock cracks, resulting in an increase in radon gas concentration at large deformation and cracking of the cavern, then damage deformation control measures need to be deployed for large deformation and cracking. Anchoring measures 4 can be adopted at places where there are many normal cracks 17 in the cavern, grouting measures 5 can be adopted at places where radial cracks 16 of the cavern are connected, and then an anti-seepage adsorption layer 9 can be deployed on the wall; If radon migrates, such as when seepage and rainfall cause groundwater to become active, radon gas is released into the cavern along with groundwater migration, causing the radon gas concentration to rise, then drainage and anti-seepage facilities need to be deployed to control the seepage field and groundwater level in the cavern (group). Horizontal and vertical drainage holes 11 can be set on the side walls and top of the cavern where the groundwater level is higher, and drainage channels 10 can be set on both sides of the cavern floor to drain groundwater from the drainage holes 11 to the drainage channels 10. Waterproof curtains 12 are set on the surrounding rocks 1 on both sides of the cavern (group), and drainage galleries 13 are laid inside the waterproof curtains 12 to lower the groundwater level. The design of the drainage hole 11, the water-blocking curtain 12, and the drainage corridor 13 needs to be based on the numerical simulation and the results of the on-site investigation, and appropriate layout positions should be adopted to ensure that the drainage hole 11, the water-blocking curtain 12, and the drainage corridor 13 are arranged below the groundwater level 14; Furthermore, the drainage hole 11 drains the groundwater into the drainage channel through the sealed drainage pipe 81, which is made of water-tight and air-tight material to prevent radon gas from escaping into the cavern; An anti-seepage adsorption layer 9 is arranged above the drainage channel 10 to prevent radon in the groundwater from escaping into the cavern through the drainage channel 10; The anti-seepage adsorption layer 9 is a multi-layer structure, the lower layer is porous activated carbon, which can adsorb radon gas, and the upper layer is a sealing material to prevent radon gas from escaping; Rising temperature and humidity will also lead to enhanced radon migration behavior, resulting in an increase in regional radon concentrations. Therefore, it is necessary to determine the temperature and humidity control thresholds based on data simulation control results, and to manage the temperature and humidity control time and area. For high humidity time periods and areas, on the one hand, drainage measures can be deployed, such as drainage holes 11, waterproof curtains 12, and drainage corridors 13 to lower the groundwater level and reduce water vapor evaporation. On the other hand, dehumidifiers 8 can be deployed for physical dehumidification. For temperature-affected control time periods and areas, on the one hand, if the air in the cave is poor due to the temperature difference between the inside and outside of the cave, an exhaust ventilation system 6 can be deployed. On the other hand, if the temperature in the cave is too high due to local geothermal heat, which enhances radon diffusion, air conditioning 7 can be deployed. Furthermore, the exhaust duct 71 of the air conditioner 7 is connected to the exhaust system to facilitate the exhaust of the air of the air conditioner 7; If the air circulation in a certain area is poor due to the design shape of the A cave, radon accumulates for a long time, forming radon gas retention, then an exhaust system 6 can be deployed to enhance the air circulation in the local area; The time period during which the area exceeds the temperature, humidity and radon concentration thresholds can be determined based on the numerical simulation and control results of temperature, humidity and radon migration, and the operation time of the dehumidifier 8 and the exhaust ventilation system 6 can be set accordingly; If the increase in radon concentration is caused by changes in multiple factors, it is necessary to identify multiple control factors and adopt the above-mentioned multiple measures for comprehensive management; Step 5. After taking control measures, monitor radon gas in the radon-enriched area of ​​the cave. If the standard is met, the control is completed. If not, return to step 3 until the standard is met.

[0023] After taking control measures, radon gas monitoring is conducted in the radon-rich areas of Cave A. If the radon concentration is lower than 400 Bq / m 3 , then the treatment is completed; if it does not meet the standards, it is necessary to re-conduct numerical simulation on the treated cavern, conduct radon concentration enrichment characteristic investigation and on-site investigation again, analyze radon enrichment factors, and take corresponding treatment measures until the standards are met.

[0024] Example 2 This embodiment provides a comprehensive treatment system for excessive radon gas enrichment in a deep underground cavern, including: Data collection module. It is used to collect the original data of the cavern to be treated, and set monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; Numerical simulation module. It is used to build a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model based on the original data collected in the experiment, and to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and the surrounding area; Enrichment cause judgment module. It is used to determine the radon enrichment area and enrichment degree of the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation and combined with on-site investigation, and analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment; A control measure selection module is used to take corresponding radon gas control measures based on the radon gas enrichment reasons obtained in the above; Treatment effect evaluation module. It is used to monitor radon gas in radon-enriched areas of the cavern after taking treatment measures. If the standards are met, the treatment is completed. If not, it returns to the numerical simulation module until the standards are met.

[0025] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

[0026] It should be understood that parts not elaborated in detail in this specification belong to the prior art.

[0027] It should be understood that the above description of the preferred embodiment is relatively detailed and cannot be regarded as limiting the scope of patent protection of the present invention. Under the enlightenment of the present invention, ordinary technicians in this field can also make substitutions or modifications without departing from the scope of protection of the claims of the present invention, which all fall within the scope of protection of the present invention. The scope of protection requested for the present invention shall be based on the attached claims.

Claims

1. A comprehensive treatment method for excessive radon gas enrichment in deep underground caverns, characterized in that: The following steps are involved: Step 1. Collect the original data of the cavern to be treated, and set up monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; Step 2. Based on the original data collected in step 1, a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model is constructed to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and surrounding areas; Step 3. Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and combined with on-site investigation, determine the radon enrichment area and enrichment degree of the cavern, analyze the temporal and spatial distribution of radon enrichment, and determine the cause of radon enrichment; Step 4. Based on the radon gas enrichment reasons obtained in step 3, corresponding radon gas control measures are taken; Step 5. After taking control measures, monitor radon gas in the radon-enriched area of ​​the cave. If the standard is met, the control is completed. If not, return to step 3 until the standard is met.

2. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: The original data in step 1 include: regional geological data, cavern construction data, hydrogeological data and meteorological data.

3. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: The monitoring data in step 1 include: temperature, humidity, surrounding rock strain and radon concentration.

4. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: The step 2 of constructing a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model includes: Based on the regional geological data and the cavern construction data, the cavern is three-dimensionally modeled; the strata are divided by Boolean operation; the strata are imported into the numerical simulation software; and the mechanical parameters of the rock and soil mass and the parameters of the support materials are determined; Assign parameters to each rock layer and support structure based on the mechanical parameters of the rock and soil mass and the parameters of the support materials; The thermodynamic boundary of the model is set according to the temperature data; the groundwater seepage boundary is set according to the rainfall and groundwater level data; the gas seepage boundary of the cavern is set according to the air pressure data; the bottom is set as a fixed boundary constraint, and the left, right, front and back vertical boundaries are set as roller supports; the cavern wall is set as a radon release source, and the inlet and outlet are set as open boundaries; The gas seepage velocity field in the cavern, the groundwater seepage field in the surrounding rock, the temperature field, the humidity field and the rock stress-strain field are calculated; the gas seepage velocity field is used as the transmission field of radon to realize the coupling of radon and gas seepage, the diffusion coefficient of radon is set as a function of temperature and humidity to realize the coupling of radon with temperature and humidity, the radon release rate is set as a function of rock damage and deformation to realize the coupling of rock damage and radon release, the groundwater seepage field is used as the transmission field of radon in the surrounding rock, and the conversion and balance of groundwater radon and cavern gas radon are realized through Henry's law, realizing the coupling of groundwater seepage and cavern radon concentration.

5. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 4, characterized in that: In step 2, the pore pressure gradient, seepage velocity vector, plastic strain cloud map, and humidity temperature field evolution of the radon gas enriched area are obtained based on the temperature-seepage-stress-radon migration multi-field coupling numerical simulation model.

6. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: The step 2 also includes: The results of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation will be compared and verified with the monitoring data to optimize the setting of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation model.

7. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: The reasons for radon gas enrichment in step 3 include: radon release, radon migration and radon retention.

8. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 6, characterized in that: In step 3, radon release is affected by the degree of rock deformation and damage, radon migration is affected by the seepage field, humidity and temperature, and radon retention is affected by the air circulation of the cavern.

9. A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern according to claim 1, characterized in that: In step 4, if radon is released, damage and deformation control measures are taken; if radon is migrated, drainage and anti-seepage or dehumidification and temperature control measures are taken; if radon is retained, extraction system or wall adsorption measures are taken.

10. A comprehensive treatment system for excessive radon gas enrichment in deep underground caverns, characterized in that: include: Data collection module. It is used to collect the original data of the cavern to be treated, and set monitoring points to monitor specific locations of the cavern to be treated to obtain monitoring data; Numerical simulation module. It is used to build a temperature-seepage-stress-radon migration multi-field coupling numerical simulation model based on the original data collected in the experiment, and to carry out temperature-seepage-stress-radon migration multi-field coupling numerical simulation on the treatment cavern and the surrounding area; Enrichment cause judgment module. It is used to determine the radon enrichment area and enrichment degree of the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupling numerical simulation and combined with on-site investigation, and analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment; A control measure selection module is used to take corresponding radon gas control measures based on the radon gas enrichment reasons obtained in the above; Treatment effect evaluation module. It is used to monitor radon gas in the radon-enriched area of ​​the cave after taking treatment measures. If the standard is met, the treatment is completed. If not, it returns to the numerical simulation module until the standard is met; The system for comprehensive treatment of excessive radon gas enrichment in deep underground caverns is used to execute the steps in the method for comprehensive treatment of excessive radon gas enrichment in deep underground caverns as described in any one of claims 1-9.

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