A method and system for comprehensive treatment of radon enrichment exceeding standard in deep underground caverns

Abstract

The application provides a kind of deep-buried underground cavern radon enrichment over standard comprehensive treatment method and system, comprising: step 1. Collect original data of the cavern to be treated, and obtain monitoring data;Step 2. Construct 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 cavern to be treated and the surrounding area;Step 3. Based on the numerical simulation results and combined with field survey, determine the radon enrichment area and enrichment degree of the cavern, and determine the radon enrichment reason;Step 4. Based on the obtained radon enrichment reason, take corresponding radon treatment measures;Step 5. Radon monitoring is carried out on the radon enrichment area of the cavern, if it meets the standard, the treatment is completed, if it does not meet the standard, return to step 3 until the standard is met. The application can determine the distribution characteristics and evolution law of the cavern radon, take comprehensive and optimized treatment measures, improve the treatment effect, and reduce the design and maintenance cost of deep-buried underground cavern.

Description

Technical Field

[0001] The present invention belongs to the technical field of radon gas treatment, and in particular relates to a comprehensive treatment method and system for radon gas enrichment exceeding the standard 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, including radon ( 222 The enrichment problem of Rn) in deep 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 (radon) is a colorless, odorless, inert gas that is a decay product of the natural radioactive system of uranium and radium. Radon and its progeny enter the human body (primarily through the exhalation system) through respiration and are currently the second leading cause of lung cancer in humans, second only to cigarettes.

[0004] Currently, the primary method for controlling excessive radon levels in underground caverns (clusters) is ventilation. Regular ventilation is used to remove high concentrations of radon from the caverns (clusters) to the outside, supplemented by sprayed concrete sealing of the cavern (clusters) rock walls, which can somewhat suppress radon release. However, as underground caverns (clusters) grow in size and depth, the required ventilation systems are becoming increasingly complex. Furthermore, as the height difference between caverns (clusters) increases, the ventilation effectiveness decreases. These methods, which simply accelerate radon release, are often ineffective for large-scale caverns (clusters). For deeply buried caverns, "waterproofing and radon suppression" solutions are also being used to control excessive radon levels by suppressing radon release. These solutions primarily involve deploying multi-layer composite structures in the rock walls and surface layers to prevent rock-derived radon and radon-containing groundwater from infiltrating the cavern (clusters). However, this technology is currently only used in underground laboratories. Although it can effectively inhibit radon release from underground caverns (groups), it is relatively expensive 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:

[0007] A comprehensive treatment method for excessive radon gas enrichment in a deep underground cavern comprises the following steps:

[0008] 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;

[0009] Step 2. Based on the original data collected in step 1, a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model is constructed to conduct temperature-seepage-stress-radon migration multi-field coupled numerical simulation of the treatment cavern and surrounding areas;

[0010] Step 3. Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, the radon enrichment areas and levels in the caverns are determined. The temporal and spatial distribution of radon enrichment is analyzed to determine the cause of radon enrichment.

[0011] Step 4. Based on the radon gas enrichment reasons obtained in step 3, take corresponding radon gas control measures;

[0012] Step 5. After taking control measures, monitor the radon gas in the radon-enriched area of ​​the cavern. If the standards are met, the control is completed. If not, return to step 3 until the standards are met.

[0013] Furthermore, the original data in step 1 include: regional geological data, cavern construction data, hydrogeological data and meteorological data.

[0014] Furthermore, the monitoring data in step 1 include: temperature, humidity, surrounding rock strain and radon concentration.

[0015] Furthermore, the construction of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation model in step 2 includes:

[0016] Conducting a three-dimensional model of the cavern based on regional geological data and cavern construction data; dividing the strata through Boolean operations; importing the model into numerical simulation software; and determining the mechanical parameters of the rock and soil mass and the parameters of the support materials;

[0017] 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;

[0018] The model's thermodynamic boundaries were set based on temperature data; the groundwater seepage boundary was set based on rainfall and groundwater level data; and the cavern's air seepage boundary was set based on air pressure data. The bottom was set as a fixed boundary constraint, and the left, right, front, and back vertical boundaries were set as roller supports. The cavern walls were set as radon release sources, and the inlet and outlet were set as open boundaries.

[0019] Calculate the cavern gas seepage velocity field, surrounding rock groundwater seepage field, temperature field, humidity field and rock stress and strain field; use the gas seepage velocity field as the radon transmission field to realize the coupling of radon and gas seepage; set the radon diffusion coefficient 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; use the groundwater seepage field as the radon transmission field in the surrounding rock; and realize the conversion and balance between groundwater radon and cavern gas radon through Henry's law, realizing the coupling of groundwater seepage and cavern radon concentration.

[0020] Furthermore, in step 2, the pore pressure gradient, seepage velocity vector, plastic strain cloud map, and humidity and temperature field evolution of the radon gas enrichment area are obtained based on the temperature-seepage-stress-radon migration multi-field coupled numerical simulation model.

[0021] Furthermore, the step 2 further includes:

[0022] 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 temperature-seepage-stress-radon migration multi-field coupling numerical simulation model settings.

[0023] Furthermore, the causes of radon gas enrichment in step 3 include: radon release, radon migration and radon retention.

[0024] 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.

[0025] 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.

[0026] In another aspect, the present invention provides a comprehensive treatment system for excessive radon gas accumulation in deep underground caverns, comprising:

[0027] Data collection module. It is used to collect 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;

[0028] Numerical simulation module. It is used to build a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model based on the original data collected in the experiment to carry out temperature-seepage-stress-radon migration multi-field coupled numerical simulation of the treatment cavern and the surrounding area;

[0029] The enrichment cause judgment module is used to determine the radon enrichment area and enrichment degree in the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, and to analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment;

[0030] A control measure selection module is used to take corresponding radon control measures based on the radon enrichment reasons obtained in the above;

[0031] 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 standards are met, the treatment is completed. If not, it returns to the numerical simulation module until the standards are met.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention uses numerical simulation to provide an intuitive and comprehensive understanding of the spatiotemporal distribution characteristics of radon gas in deep underground caverns (clusters) in advance, and to conduct simulation and control in advance. For large-scale underground caverns (clusters), this method avoids the potential for overgeneralization in in-situ monitoring.

[0034] 2. In terms of control strategy, the present invention analyzes the internal and external factors that affect regional radon enrichment from the perspective of radon gas generation, release, migration, and retention throughout its life cycle, and adopts targeted control measures to comprehensively control radon enrichment in deep underground caverns (groups) and improve control effects.

[0035] 3. Through numerical simulation and comprehensive treatment strategies, the present invention can avoid the use of complex exhaust and dehumidification systems and high-cost radon suppression solutions, reducing the design difficulty and subsequent maintenance costs of deep underground caverns (clusters); BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to 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 any creative work.

[0037] Figure 1 is a flow chart of a method according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of the treatment measures of an embodiment of the present invention.

[0039] 1. Cavern surrounding rock; 2. Lining; 3. Temperature, humidity and radon concentration monitoring system; 4. Anchoring measures; 5. Grouting measures; 6. Exhaust ventilation system; 7. Air conditioning; 71. Exhaust ventilation 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

[0040] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] Example 1

[0042] 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:

[0043] 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;

[0044] 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.

[0045] 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 through 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.

[0046] Step 2. Based on the original data collected in step 1, a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model is constructed to conduct temperature-seepage-stress-radon migration multi-field coupled numerical simulation of the treatment cavern and surrounding areas;

[0047] In this embodiment, hydrogeological units are demarcated and modeled for Cave A and its surrounding areas. Three-dimensional modeling is performed in modeling software based on the terrain and the design parameters of Cave A. Strata are divided using Boolean operations based on stratum distribution data. The model is then imported into numerical simulation software. Geotechnical parameters (elastic modulus, Poisson's ratio, density, compressive / tensile strength, internal friction angle, cohesion, thermal conductivity, permeability, etc.) and support material parameters (elastic modulus, Poisson's ratio, and yield strength of concrete / steel) are determined using in-situ tests, laboratory tests, and design data. Parameters are then assigned to each rock layer and support structure based on the geotechnical parameters and support material parameters.

[0048] The model's thermodynamic boundaries were set based on the temperature data for the A cavern area. The model's seepage boundaries were set based on rainfall and groundwater level data. The gas seepage boundary for A cavern was set based on air pressure data. Fixed boundary constraints were set at the bottom of the A cavern model, and roller supports were set at the left, right, front, and back vertical boundaries. The walls of A cavern were set as radon release sources, and the inlet and outlet were set as open boundaries.

[0049] Considering the effects of temperature, humidity, seepage and rock damage on radon release and migration: 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 are calculated through boundary conditions; the gas seepage velocity field is used as the transmission field of radon to achieve the coupling of radon and gas seepage, the diffusion coefficient of radon is set as a function of temperature and humidity to achieve the coupling of radon with temperature and humidity, the radon release rate is set as a function of rock damage and deformation to achieve 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 radon in the groundwater body of chamber A and the gas radon in chamber A are achieved through Henry's law, thus achieving the coupling of groundwater seepage and chamber radon concentration;

[0050] 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 during 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.

[0051] Step 3. Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, the radon enrichment areas and levels in the caverns are determined. The temporal and spatial distribution of radon enrichment is analyzed to determine the cause of radon enrichment.

[0052] In this embodiment, the numerical simulation results are analyzed and according to the national standard, the indoor radon concentration of cave A is greater than 400 Bq / m 3The specific time period area is considered to be the cavern radon gas enrichment area; 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.

[0053] Step 4. Based on the radon gas enrichment reasons obtained in step 3, take corresponding radon gas control measures;

[0054] In this embodiment, according to the enrichment reasons of each radon gas enrichment area in cave A, by adjusting parameters such as cave A's temperature, humidity, and surrounding rock stress and strain, numerical simulation is performed again to achieve that the radon concentration in each radon enrichment area of ​​cave A in the numerical simulation is lower than the required standard. At this time, parameters such as cave A's temperature, humidity, groundwater level or surrounding rock stress and strain are the reference standards for control measures. Combined with on-site investigation, comprehensive measures such as drainage and anti-seepage facilities, damage and deformation control facilities, temperature and humidity control facilities, wall adsorption facilities, and extraction and drainage systems are set to control the relevant parameters of cave A to meet the simulation reference standards, thereby achieving the suppression of radon release, radon migration, and radon retention.

[0055] like Figure 2 As shown, if radon release, that is, rock deformation damage caused by high stress, causes a large amount of radon gas to be released from the rock cracks, resulting in an increase in radon gas concentration at the large deformation and cracking of the cavern, then damage and deformation control measures need to be deployed for the large deformation and cracking. Anchoring measures 4 can be taken at places with more normal cracks 17 in the cavern, grouting measures 5 can be taken at places where radial cracks 16 in the cavern penetrate, and then an anti-seepage adsorption layer 9 can be deployed on the wall.

[0056] If radon migrates, such as when seepage and rainfall cause groundwater to become active, radon gas migrates with groundwater and is released into the cavern, causing the radon gas concentration to rise, 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 corridors 13 are laid inside the waterproof curtains 12 to lower the groundwater level.

[0057] The design of the drainage holes 11, water-blocking curtains 12, and drainage corridors 13 needs to be based on numerical simulation and on-site survey results, and appropriate layout positions should be adopted to ensure that the drainage holes 11, water-blocking curtains 12, and drainage corridors 13 are laid out below the groundwater level 14;

[0058] Furthermore, the drainage hole 11 drains the groundwater into the drainage channel through the sealed diversion pipe 81, which is made of water-tight and air-tight material to prevent radon gas from escaping into the cavern;

[0059] An anti-seepage adsorption layer 9 is laid above the drainage channel 10 to prevent radon in the groundwater from escaping into the cavern through the drainage channel 10;

[0060] 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;

[0061] Rising temperature and humidity will also lead to increased radon migration, causing the radon concentration in the area to increase. Therefore, it is necessary to determine the temperature and humidity control thresholds based on the 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 quality 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.

[0062] Furthermore, the exhaust duct 71 of the air conditioner 7 is connected to the exhaust system to facilitate the extraction and exhaust of the air conditioner 7;

[0063] If the design shape of chamber A causes poor air circulation in a certain area, resulting in long-term accumulation of radon and radon gas stagnation, an exhaust system 6 can be installed to enhance the air circulation in the local area.

[0064] The time period during which the area exceeds the temperature, humidity and radon concentration thresholds can be determined based on the temperature, humidity and radon migration numerical simulation and control results, and the operating time of the dehumidifier 8 and the exhaust system 6 can be set accordingly;

[0065] 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 control;

[0066] Step 5. After taking control measures, monitor the radon gas in the radon-enriched area of ​​the cavern. If the standards are met, the control is completed. If not, return to step 3 until the standards are met.

[0067] After taking control measures, radon gas monitoring is conducted in the radon-rich area of ​​Cave A. If the radon gas concentration is lower than 400 Bq / m 3 , the treatment is completed; if it does not meet the standards, it is necessary to re-simulate the treated caverns, conduct a radon concentration enrichment characteristics survey and on-site investigation again, analyze the radon enrichment factors, and take corresponding treatment measures until the standards are met.

[0068] Example 2

[0069] This embodiment provides a comprehensive treatment system for excessive radon gas accumulation in deep underground caverns, including:

[0070] Data collection module. It is used to collect 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;

[0071] Numerical simulation module. It is used to build a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model based on the original data collected in the experiment to carry out temperature-seepage-stress-radon migration multi-field coupled numerical simulation of the treatment cavern and the surrounding area;

[0072] The enrichment cause judgment module is used to determine the radon enrichment area and enrichment degree in the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, and to analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment;

[0073] A control measure selection module is used to take corresponding radon control measures based on the radon enrichment reasons obtained in the above;

[0074] 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 standards are met, the treatment is completed. If not, it returns to the numerical simulation module until the standards are met.

[0075] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

[0076] It should be understood that parts not elaborated in detail in this specification belong to the prior art.

[0077] It should be understood that the above description of the preferred embodiment is relatively detailed and cannot be regarded as limiting the scope of protection of the patent of the present invention. Under the guidance 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 by the present invention shall be based on the attached claims.

Claims

1. A comprehensive treatment method for excessive radon gas in deep underground caverns, characterized in that: The following steps are involved: Step 1: Collect 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 coupled numerical simulation model is constructed to conduct temperature-seepage-stress-radon migration multi-field coupled numerical simulation on the treatment cavern and surrounding areas; including: Conducting a three-dimensional model of the cavern based on regional geological data and cavern construction data; dividing the strata through Boolean operations; importing the model into numerical simulation software; and determining the mechanical parameters of the rock and soil mass and the parameters of the support materials; 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 model's thermodynamic boundaries were set based on temperature data; the groundwater seepage boundary was set based on rainfall and groundwater level data; and the cavern's gas seepage boundary was set based on air pressure data. The bottom was set as a fixed boundary constraint, and the left, right, front, and back vertical boundaries were set as roller supports. The cavern walls were set as radon release sources, and the inlet and outlet were set as open boundaries. Calculate the cavern gas seepage velocity field, surrounding rock groundwater seepage field, temperature field, humidity field, and rock stress and strain field; use the gas seepage velocity field as the radon transmission field to achieve the coupling between radon and gas seepage; set the radon diffusion coefficient as a function of temperature and humidity to achieve the coupling between radon and temperature and humidity; set the radon release rate as a function of rock damage and deformation to achieve the coupling between rock damage and radon release; use the groundwater seepage field as the radon transmission field in the surrounding rock; and realize the conversion and balance between groundwater radon and cavern gas radon through Henry's law, thus achieving the coupling between groundwater seepage and cavern radon concentration; Step 3: Based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, the radon enrichment area and degree in the cavern are determined, and the temporal and spatial distribution of radon enrichment is analyzed to 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, radon gas monitoring is carried out in the radon gas enriched area of ​​the cavern. If the standards are met, the control is completed. If not, return to step 3 until the standards are met.

2. A comprehensive treatment method for excessive radon gas accumulation in deep underground caverns 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. The comprehensive treatment method for excessive radon gas accumulation in deep underground caverns 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 deep underground caverns according to claim 1, characterized in that: In step 2, the pore pressure gradient, seepage velocity vector, plastic strain cloud map, and humidity and temperature field evolution of the radon gas enrichment area are obtained based on the temperature-seepage-stress-radon migration multi-field coupled numerical simulation model.

5. The comprehensive treatment method for excessive radon gas accumulation in deep underground caverns according to claim 1, characterized in that: 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 temperature-seepage-stress-radon migration multi-field coupling numerical simulation model settings.

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

7. A comprehensive treatment method for excessive radon gas accumulation in deep underground caverns 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 in the cavern.

8. The comprehensive treatment method for excessive radon gas accumulation in deep underground caverns 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.

9. A comprehensive treatment system for excessive radon gas in deep underground caverns, characterized in that: include: The data collection module 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; The numerical simulation module is used to construct a temperature-seepage-stress-radon migration multi-field coupled numerical simulation model based on the collected original data to carry out temperature-seepage-stress-radon migration multi-field coupled numerical simulation of the treatment cavern and the surrounding area; The enrichment cause judgment module is used to determine the radon enrichment area and enrichment degree in the cavern based on the results of the temperature-seepage-stress-radon migration multi-field coupled numerical simulation and on-site investigation, and to analyze the temporal and spatial distribution of radon enrichment to determine the cause of radon enrichment; A control measure selection module, which is used to take corresponding radon gas control measures based on the radon gas enrichment reasons obtained in the above; The treatment effect evaluation module is used to monitor radon gas in the radon-enriched area of ​​the cavern after taking treatment measures. If the standards are met, the treatment is completed. If not, the module returns to the numerical simulation module until the standards are met. The system for comprehensive treatment of radon gas enrichment exceeding the standard in deep underground caverns is used to execute the steps of the method for comprehensive treatment of radon gas enrichment exceeding the standard in deep underground caverns as described in any one of claims 1-8.

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