Ventilation radon reduction method, device, equipment and medium for uranium mine tunnel

Abstract

The present application relates to the technical field of mine safety and radiation protection, and particularly relates to a uranium mine tunnel ventilation radon reduction method, device, equipment and medium. The method comprises: obtaining basic parameters of the uranium mine tunnel, the basic parameters comprising ventilation mode, geology and ventilation basic parameters; calculating the radon exhalation rate of the wall surface of the uranium mine tunnel under the current ventilation mode according to the geology and ventilation basic parameters; determining the radon exhaust air volume required by the uranium mine tunnel according to the radon exhalation rate; and performing air curtain induced ventilation treatment on the uranium mine tunnel according to the radon exhaust air volume and the air flow field of the uranium mine tunnel. The present application can solve the problem that the radon exhalation intensity cannot be accurately quantified in the prior art, which leads to the problems that the ventilation design lacks reliable basis and the radon reduction measures are not effective.

Description

Technical Field

[0001] This invention relates to the field of mine safety and radiation protection technology, and in particular to a method, apparatus, equipment and medium for radon reduction ventilation in uranium mine roadways. Background Technology

[0002] As uranium mining continues to advance deeper, the underground environment becomes increasingly complex, with characteristics such as high ground stress, high ground temperature, and high pore water pressure becoming more prominent. These factors lead to changes in the pore structure and permeability of the surrounding rock, which in turn affects the diffusion and emission patterns of radon. The pollution problem of radon and its decay products is becoming increasingly prominent, posing a serious threat to the health of workers.

[0003] Currently, mine ventilation and radon reduction mainly rely on traditional empirical formulas for design, and often adopt a global ventilation approach, combined with some radon reduction measures based on general experience, in order to reduce the radon concentration underground and ensure the basic safety of mining operations.

[0004] However, existing technologies have significant shortcomings: traditional empirical formulas are difficult to adapt to deep and complex environments and cannot accurately quantify the dynamically changing radon release intensity, resulting in a lack of reliable basis for ventilation design; the global ventilation in existing technologies cannot solve the problems of airflow short-circuiting and dead zones in local confined spaces such as chambers and single-ended tunnels, where radon gas is easy to accumulate, and radon reduction based on general experience has the problems of high energy consumption and poor radon reduction effect. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for radon reduction ventilation in uranium mine tunnels, addressing the problem in existing technologies where the dynamic changes in radon release intensity cannot be accurately quantified, leading to a lack of reliable basis for ventilation design and ineffective radon reduction measures.

[0006] In a first aspect, embodiments of the present invention provide a method for ventilation and radon reduction in uranium mine roadways, comprising: Obtain basic parameters of uranium mine roadways, including ventilation methods and geological and ventilation basic parameters; Based on the aforementioned geological and ventilation parameters, calculate the radon exudation rate on the walls of the uranium mine tunnel under the current ventilation mode; Based on the radon release rate, determine the required radon exhaust volume for the uranium mine tunnel; Based on the radon exhaust volume and the airflow field of the uranium mine tunnel, the uranium mine tunnel is subjected to air curtain induced ventilation treatment.

[0007] In one possible implementation, the geological and ventilation basic parameters include: the permeability of the surrounding rock, the porosity of the surrounding rock, the aerodynamic viscosity, the equivalent height of the roadway burial depth, the roadway radius, the radon diffusion coefficient, the radon decay constant, the radon production rate of the rock, and the pressure difference between the inside and outside of the roadway under the current ventilation mode. Based on the aforementioned geological and ventilation parameters, calculate the radon exhalation rate of the uranium mine tunnel walls under the current ventilation mode, including: The permeability of the surrounding rock in the uranium mine tunnel is calculated based on the surrounding rock permeability, the surrounding rock porosity, the aerodynamic viscosity, the equivalent height of the tunnel burial depth, the tunnel radius, and the air pressure difference inside and outside the tunnel under the current ventilation mode. Based on the radon diffusion coefficient and the radon decay constant, calculate the diffusion length and diffusion rate of radon in the rock; Based on the surrounding rock infiltration rate, the radon diffusion length, the radon diffusion coefficient, and the radon production rate of the rock, the radon release rate of the uranium mine tunnel wall under the current ventilation mode is calculated.

[0008] In one possible implementation, the permeability of the surrounding rock in the uranium mine roadway is calculated based on the surrounding rock permeability, the surrounding rock porosity, the aerodynamic viscosity, the equivalent height of the roadway burial depth, the roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode, including: according to Calculate the permeability of the surrounding rock in the uranium mine tunnel; In the formula, Indicates the permeability of the surrounding rock. Indicates the permeability rate of the surrounding rock. This indicates the air pressure difference between the inside and outside of the tunnel under the current ventilation mode. Indicates aerodynamic viscosity. Indicates the porosity of the surrounding rock. Indicates the equivalent height of the tunnel burial depth. Indicates the radius of the tunnel; The diffusion length of radon in the rock is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion length of radon in the rock; In the formula, This indicates the diffusion length of radon in rocks. This represents the diffusion coefficient of radon in rocks. Represents the radon decay constant; The diffusion rate of radon in rocks is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion rate of radon in rocks; In the formula, This indicates the rate at which radon diffuses in rocks.

[0009] In one possible implementation, the radon exudation rate of the uranium mine tunnel wall under the current ventilation mode is calculated based on the surrounding rock infiltration velocity, the radon diffusion length, the radon diffusion coefficient, and the radon production rate of the rock, including: If the current ventilation method is exhaust ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate from the walls of a uranium mine tunnel during exhaust ventilation. Indicates the radon yield of the rock; If the current ventilation method is forced ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate on the walls of a uranium mine tunnel during forced ventilation.

[0010] In one possible implementation, determining the required radon exhaust volume for the uranium mine tunnel based on the radon release rate includes: according to Calculate the required radon exhaust volume for the uranium mine tunnel; In the formula, This indicates the required radon ventilation volume for uranium mine tunnels. This represents the correction factor. The first uranium mine tunnel Radon release rate from the wall surface Indicates the first The area of ​​the wall, Indicates the radon emission concentration limit. This indicates the radon concentration in the incoming air.

[0011] In one possible implementation, based on the radon exhaust volume and the airflow field of the uranium mine roadway, the uranium mine roadway is subjected to air curtain-induced ventilation treatment, including: Obtain the air volume of the target area in the uranium mine tunnel; If the air volume is less than the radon exhaust volume, or if there is a dead zone in the airflow, then the uranium mine roadway shall be subjected to air curtain induced ventilation treatment.

[0012] In one possible implementation, the uranium mine roadway is subjected to air curtain-induced ventilation, including: Air curtains are installed at predetermined positions upstream and downstream of the target area in the uranium mine roadway; A three-dimensional numerical model is established, which includes the tunnel, the chamber and the air curtain. The objective function of the three-dimensional numerical model is to minimize the average radon concentration in the height plane of the human breathing zone in the chamber, minimize the proportion of the area with radon concentration exceeding the standard, or maximize the proportion of the area with radon concentration not exceeding the standard. Solve the three-dimensional numerical model to obtain the optimal air curtain parameters; Based on the optimal air curtain parameters, install the air curtain in the target area downhole.

[0013] Secondly, embodiments of the present invention provide a radon reduction ventilation device for uranium mine roadways, comprising: The acquisition module is used to acquire basic parameters of uranium mine roadways, including ventilation methods and geological and ventilation basic parameters. The calculation module is used to calculate the radon exudation rate of the wall surface of the uranium mine roadway under the current ventilation mode, based on the geological and ventilation basic parameters. The processing module is used to determine the required radon exhaust volume for the uranium mine roadway based on the radon exhalation rate. The processing module is also used to perform air curtain-induced ventilation treatment on the uranium mine roadway based on the radon exhaust volume and the airflow field of the uranium mine roadway.

[0014] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.

[0015] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect or any possible implementation thereof.

[0016] This invention provides a method, apparatus, equipment, and medium for radon reduction ventilation in uranium mine roadways. The method involves acquiring basic parameters of the uranium mine roadway, including ventilation mode and geological and ventilation parameters; calculating the radon release rate of the roadway walls under the current ventilation mode based on the geological and ventilation parameters; determining the required radon exhaust air volume for the uranium mine roadway based on the radon exhaust air volume and the airflow field of the uranium mine roadway; and performing air curtain-induced ventilation treatment on the uranium mine roadway based on the radon exhaust air volume and the airflow field of the uranium mine roadway. This invention, through its embodiment, uses the basic parameters of uranium mine roadways and current ventilation methods, employs a radon exhalation rate calculation model to accurately calculate the radon exhalation rate on the roadway walls. Furthermore, it directly couples the dynamic radon exhalation rate calculation model in the deep environment of uranium mines with the ventilation engineering design, transforming ventilation volume calculation and measure design from "experience-driven" to "data and model-driven." This improves the scientific rigor and accuracy of ventilation design, avoids "one-size-fits-all" large-volume ventilation, and reduces the energy consumption of the ventilation system while ensuring radon reduction, resulting in significant economic benefits. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the implementation of the radon reduction ventilation method for uranium mine tunnels provided in this embodiment of the invention. Figure 2(a) is a top view of the chamber provided in an embodiment of the present invention; Figure 2(b) is a side view of the chamber provided in an embodiment of the present invention; Figure 2(c) is a schematic diagram of the air curtain parameters provided in an embodiment of the present invention; Figure 3(a) shows the different embodiments provided by the present invention. Schematic diagram of radon concentration at different X-sections within time V1; Figure 3(b) shows the different embodiments provided by the present invention. Schematic diagram of average radon concentration; Figure 3(c) shows the different embodiments provided by the present invention. When the radon concentration in V1 is greater than 400 Percentage diagram; Figure 3(d) shows the different embodiments provided by the present invention. Schematic diagram of radon concentration at different X-sections within time V1; Figure 3(e) shows the different embodiments provided by the present invention. Schematic diagram of average radon concentration; Figure 3(f) shows the different embodiments provided by the present invention. When the radon concentration in V1 is greater than 400 Percentage diagram; Figure 3(g) shows the different embodiments provided by the present invention. Schematic diagram of radon concentration at different X-sections within time V1; Figure 3(h) shows the different embodiments provided by the present invention. Schematic diagram of average radon concentration; Figure 3(i) shows the different embodiments provided by the present invention. When the radon concentration in V1 is greater than 400 Percentage diagram; Figure 3(j) shows the different embodiments provided by the present invention. Schematic diagram of radon concentration at different X-sections within time V1; Figure 3(k) shows the different embodiments provided by the present invention. Schematic diagram of average radon concentration; Figure 3(l) shows the different embodiments provided by the present invention. When the radon concentration in V1 is greater than 400 Percentage diagram; Figure 4 This is a schematic diagram of the ventilation and radon reduction device for uranium mine tunnels provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] See Figure 1 The document illustrates a flowchart of a radon reduction ventilation method for uranium mine tunnels provided by an embodiment of the present invention, detailed below: Step 101: Obtain the basic parameters of the uranium mine roadway, including ventilation method and geological and ventilation basic parameters.

[0021] To achieve accurate design of a radon reduction ventilation system for deep uranium mine tunnels, it is first necessary to obtain comprehensive basic parameters of the uranium mine tunnels, including ventilation methods, geological and ventilation basic parameters, so as to provide reliable data support for subsequent radon release rate calculation, ventilation demand assessment and air curtain system optimization.

[0022] Among them, it is necessary to clarify whether the ventilation method currently used in the roadway is forced ventilation or exhaust ventilation. Different ventilation methods will directly affect the migration pattern of radon in the roadway and the calculation logic of radon release rate, which is a key prerequisite for subsequent model selection.

[0023] Basic geological and ventilation parameters need to be accurately obtained through on-site surveys, laboratory tests, etc., including: The permeability of the surrounding rock in a uranium mine tunnel reflects the rock's ability to allow gas to permeate and is a core indicator for calculating gas permeation rate. The permeability is measured using the pulse method, based on the Darcy-Krüger-Fischer integrated calculation model. A gas container filled with a certain pressure is placed at the sample inlet. At the start of the measurement, this container is connected to the sample inlet, and the pressure change over time is measured. The gas pressure distribution along the sample length varies with both location and time. Based on the pressure change in the gas container over time and relevant parameters, the sample permeability can be calculated. The porosity of surrounding rock refers to the proportion of pores in the apparent volume of granular materials to the total volume. It is an important parameter affecting the gas and fluid transport performance in porous media and is one of the important parameters in the simulation study of radon transport in porous media. The porosity of surrounding rock can be calculated using the helium expansion principle and Boyle's law.

[0024] Aerodynamic viscosity reflects the internal friction characteristics of air flow and is an important parameter for calculating permeation velocity. The equivalent height of the tunnel burial depth is related to the stress, air pressure and other conditions of the deep environment where the tunnel is located, and needs to be determined in combination with the actual burial depth and geological conditions of the tunnel. Lane radius; The radon diffusion coefficient reflects the ability of radon gas to diffuse in surrounding rocks and air, and directly affects the migration rate of radon gas. The radon decay constant, which characterizes the rate of natural decay of radon gas, is a key basis for calculating the radon diffusion length. The radon production rate of rocks reflects the intensity of free radon generation within the surrounding rock and is a core source term parameter for calculating radon release rate. Equilibrium radon concentrations at different temperatures and humidity levels can be measured using a homemade radon collection tank. This is because the diffusion coefficient of radon in fractured core samples is typically greater than... When the height of the broken core sample is 15 Under these conditions, all the radon in the core sample can diffuse into the air. At this time, the radon concentration in the air of the radon collection tank is equivalent to the pore radon concentration in the core sample. Based on the radon diffusion balance theory, the radon production rate of the rock can be calculated.

[0025] In practice, geological parameters such as surrounding rock permeability, surrounding rock porosity, radon diffusion coefficient, and radon production rate can be obtained through geological drilling and laboratory analysis of rock samples; the pressure difference between the inside and outside of the tunnel can be obtained through on-site air pressure monitoring; the equivalent height of the tunnel burial depth and the tunnel radius can be determined by combining tunnel design drawings and actual measurement data; and the aerodynamic viscosity and radon decay constant can be determined based on industry-standard or experimental test data to ensure the accuracy and completeness of all basic parameters, laying a solid foundation for subsequent design stages.

[0026] Step 102: Calculate the radon release rate on the walls of the uranium mine tunnel under the current ventilation mode, based on the geological and ventilation parameters.

[0027] After obtaining the basic geological and ventilation parameters, the radon release rate of the uranium mine tunnel wall under the current ventilation mode is calculated, providing core data support for subsequent ventilation demand assessment and ensuring the pertinence and scientific nature of the ventilation design.

[0028] In one embodiment, the radon exhalation rate of the uranium mine tunnel wall under the current ventilation mode is calculated based on geological and ventilation parameters, including: The permeability of the surrounding rock in a uranium mine roadway is calculated based on the surrounding rock permeability, surrounding rock porosity, aerodynamic viscosity, equivalent height of the roadway burial depth, roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode. Based on the radon diffusion coefficient and radon decay constant, calculate the diffusion length and diffusion rate of radon in rocks; Based on the surrounding rock infiltration rate, radon diffusion length, radon diffusion coefficient, and radon production rate of the rock, calculate the radon release rate on the wall of the uranium mine roadway under the current ventilation method.

[0029] Optionally, in one embodiment, the surrounding rock permeability of the uranium mine roadway is calculated based on the surrounding rock permeability, surrounding rock porosity, aerodynamic viscosity, equivalent height of the roadway burial depth, roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode, including: according to Calculate the permeability of the surrounding rock in a uranium mine tunnel; In the formula, Represents the permeability of surrounding rock, in units of , Indicates the permeability rate of the surrounding rock. This indicates the air pressure difference between the inside and outside of the tunnel under the current ventilation mode, in units of... , Expresses aerodynamic viscosity, in units of... , Indicates the porosity of the surrounding rock. Indicates the equivalent height of the tunnel burial depth, in units of , Indicates the radius of the tunnel, in units of ; The permeability of surrounding rock directly reflects the permeability of gas in the surrounding rock and is a key kinetic parameter affecting radon precipitation.

[0030] Optionally, in one embodiment, calculating the radon diffusion length in the rock based on the radon diffusion coefficient and the radon decay constant includes: according to Calculate the diffusion length of radon in the rock; In the formula, This indicates the diffusion length of radon in rocks, measured in units of... , This represents the diffusion coefficient of radon in rocks, expressed in units of... , This represents the radon decay constant.

[0031] Radon diffusion length characterizes the effective diffusion distance of radon gas in the surrounding rock, and determines the range of radon gas migration from the interior of the surrounding rock to the tunnel wall.

[0032] The diffusion rate of radon in rocks is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion rate of radon in rocks; In the formula, This indicates the diffusion rate of radon in rocks, expressed in units of... .

[0033] When there is a pressure difference between the inside and outside of the tunnel When this happens, radial seepage occurs within the pipe wall, affecting radon migration and precipitation. Therefore, both exhaust ventilation and forced ventilation methods are considered for tunnel ventilation.

[0034] In one embodiment, the radon exudation rate of the uranium mine tunnel wall under the current ventilation mode is calculated based on the surrounding rock infiltration rate, radon diffusion length, radon diffusion coefficient, and radon production rate of the rock, including: If the current ventilation method is exhaust ventilation, then according to Calculate the radon precipitation rate on the walls of a uranium mine tunnel; In the formula, This indicates the radon release rate from the walls of a uranium mine tunnel during exhaust ventilation. The radon yield of the rock is expressed in units of 1000 ppm. ; If the current ventilation method is forced ventilation, then according to Calculate the radon precipitation rate on the walls of a uranium mine tunnel; In the formula, This indicates the radon release rate on the walls of a uranium mine tunnel during forced ventilation.

[0035] The above formula can accurately quantify the radon release rate on the tunnel wall under the current ventilation conditions, fully adapting to the dynamic characteristics of radon migration in the complex environment of deep uranium mines, and overcoming the limitations of traditional empirical estimation.

[0036] Step 103: Determine the required radon exhaust volume for the uranium mine roadway based on the radon release rate.

[0037] In one embodiment, according to Calculate the required radon exhaust volume for the uranium mine tunnel; In the formula, This indicates the required radon ventilation volume for uranium mine tunnels. This represents the correction factor. The first uranium mine tunnel Radon release rate from the wall surface Indicates the first The area of ​​the wall, Indicates the radon emission concentration limit. This indicates the radon concentration in the incoming air.

[0038] Step 104: Based on the radon exhaust volume and the airflow field of the uranium mine roadway, implement air curtain-induced ventilation treatment for the uranium mine roadway.

[0039] After completing the calculation of radon exhaust volume and the analysis of the airflow field, based on the radon exhaust volume and the airflow field of the uranium mine roadway, targeted air curtain induced ventilation treatment was carried out to solve the problems of insufficient air volume and radon accumulation in local areas, and to achieve precise radon reduction.

[0040] In one embodiment, based on the radon exhaust volume and the airflow field of the uranium mine roadway, air curtain-induced ventilation is performed on the uranium mine roadway, including: To obtain the air volume at the entrance of the uranium mine tunnel or market; If the air volume is less than the radon exhaust volume, or if there is a dead air zone, then the uranium mine roadway should be induced by air curtain ventilation.

[0041] In this embodiment, firstly, the actual air volume at the entrance of the uranium mine roadway chamber or stope needs to be obtained and compared with the radon exhaust air volume calculated in step 103. The airflow field analysis results are then used to determine whether air curtain induced ventilation is necessary. If the actual air volume at the entrance of the chamber or stope is less than the radon exhaust air volume, resulting in radon gas not being able to be discharged in time, or if there is an obvious dead zone in the airflow field, causing the wind speed in a local area to be too low and radon gas to accumulate easily, then air curtain induced ventilation treatment for the uranium mine roadway is initiated.

[0042] Optionally, obvious airflow dead zones can be determined through numerical simulation or on-site measurement. For example, airflow dead zones are often formed at the ends of roadways.

[0043] In one embodiment, the uranium mine roadway is subjected to air curtain-induced ventilation treatment, including: Air curtains are installed at predetermined locations upstream and downstream of the target area in the uranium mine roadway; A three-dimensional numerical model including tunnels, chambers, and air curtains was established. The objective function of the three-dimensional numerical model is to minimize the average radon concentration at the height of the human breathing zone in the chamber, minimize the proportion of areas with radon concentration exceeding the standard, or maximize the proportion of areas with radon concentration not exceeding the standard. Solve the three-dimensional numerical model to obtain the optimal air curtain parameters; Based on the optimal air curtain parameters, install the air curtain in the target area downhole.

[0044] In this embodiment, during the ventilation treatment using air curtains, the first step is to install air curtains at preset positions upstream and downstream of the target area in the uranium mine roadway. The air curtains guide the formation of directional induced airflow, improving the local airflow organization. Here, the target area can be the entrance to the chamber or stope, and key locations around the entrance to the chamber or stope.

[0045] Based on the geometric model of a middle section of a roadway containing a chamber in an underground mine, Figure 2 shows a schematic diagram of the chamber structure for wind curtain induced ventilation optimization. Figure 2(a) is a top view of the chamber, Figure 2(b) is a side view of the chamber, and Figure 2(c) is a schematic diagram of the wind curtain parameters.

[0046] In Figures 2(a) and 2(b), the length of the upstream tunnel of the chamber is 16. The downstream tunnel is 10 kilometers long. The dimensions of the alley are The dimensions of the chamber are The cross-sectional area of ​​the tunnel is The cross-sectional area of ​​the chamber is ; The parameters of the air curtain include: the length of the upstream air curtain, i.e., the length of the air curtain within the tunnel. Downstream air curtain length, i.e., the length of the air curtain inside the chamber. The distance between the upstream air curtain and the tunnel wall, i.e., the width between the air curtain and the tunnel wall inside the tunnel. The distance between the downstream air curtain and the chamber wall, i.e., the width between the chamber air curtain and the chamber wall. The unit for the above air curtain parameters is meters.

[0047] Optionally, the empirical range for the above air curtain parameters can be: The range is [0.5, 1.5]. The range is [5, 7]. The range is [0.5, 0.7]. The range is [0.4, 0.6]. This indicates a chamber that is 17.5 meters long. This indicates a chamber that is 2 meters long. express Inside It is a 1.6-meter-wide plane.

[0048] The second step, in order to obtain the optimal values ​​of the air curtain parameters, involves using Computational Fluid Dynamics (CFD) software to establish a three-dimensional numerical model that includes the tunnel, chamber, and air curtain. This three-dimensional numerical model uses the minimum average radon concentration at the height of the human breathing zone within the chamber, the minimum proportion of areas exceeding the radon concentration standard, or the maximum proportion of areas within the radon concentration standard as its objective function, ensuring that the design scheme meets the safety requirements of the actual working environment for operators.

[0049] The third step is to solve the three-dimensional numerical model and obtain the optimal air curtain parameters through multiple rounds of simulation and iterative optimization.

[0050] Optionally, numerical simulation under normal temperature and pressure conditions is adopted, and the simulation boundary conditions are set as follows: (1) The western part of the roadway is the velocity inlet boundary. It is assumed that the air flowing into the roadway is incompressible. Based on the actual measured wind speed and radon concentration at the roadway inlet, the speed at the roadway inlet is set to 2 m / s, and the radon concentration at the roadway inlet is set to 300 m / s. (2) The walls of the tunnels and chambers are wall surfaces with a roughness of 0.05 μm, while the walls of the ventilation curtains are smooth with no roughness. (3) A sample was taken from an underground mine, and the radon release rate of the sample was measured to be 0.7%. Therefore, the radon exhalation rate of the chamber walls was set to 0.7. (4) The eastern part of the tunnel is the exit boundary, and it is set to natural outflow. (5) Assume that the air flow is steady turbulent. (6) Considering the effect of gravity, it is set to... The direction magnitude is -9.81. The acceleration due to gravity. The height of the human breathing zone inside the tunnel.

[0051] Because this area is deep within the chamber, it has been confirmed that radon exudation intensity is high in the deep part of the chamber under conventional ventilation, resulting in a high ventilation demand. Preliminary calculations indicate that the existing airflow diffuses upon entering the chamber, resulting in insufficient air volume. The deepest part of the chamber is 2... The average radon concentration in the chamber was as high as 1899.5%. Far exceeding 400 The limit is reached. Therefore, air curtains need to be installed in the tunnels before and after the entrance to the chamber. A CFD model is established with the internal radon concentration of the chamber below 400. With the objective of maximizing the regional proportion, the parameters are adjusted accordingly. , , , Perform simulation optimization.

[0052] Optionally, by changing one parameter of the air curtain while keeping the other three constant, multiple different parameter variations can be designed for simulation. By solving the three-dimensional numerical model constructed in the second step and comparing multiple simulations, a set of optimal air curtain parameters can be obtained. , , , .

[0053] Optionally, while keeping other influencing factors ( It is 10. It is 0.4. With the value remaining constant at 0.4, the length of the upstream air curtain is changed. Regarding the length of the upstream air curtain Five sets of parameters were designed: 0.5, 1, 2, 3, and 4. The simulation results are shown in Figures 3(a) to 3(c), where Figure 3(a) shows the results for different parameters. Schematic diagram of radon concentration at different X-sections within V1, where V1 refers to the volume of the 20-meter-long chamber. Figure 3(b) shows different... Schematic diagram of average radon concentration, Figure 3(c) shows different When the radon concentration in V1 is greater than 400 Percentage diagram. The radon concentration is lowest near the Z2 plane of the chamber (Z2 refers to the vertical interface at the end of the chamber). As the distance from the Z2 plane increases, the radon concentration gradually rises. Later, due to the backflow formed by the jet fluid impacting the chamber wall, the radon concentration in the chamber entrance area is diluted, resulting in a 'first rise, then fall' trend in the radon concentration of the X-section. When the concentration is 0.5 or 1, the radon concentration in the X section is lower than in the other three cases, as shown in Figure 3(a). As shown in Figures 3(b) and 3(c), regardless of whether the radon concentration is the average concentration in V1, the average concentration in V2, the average concentration on the Z1 surface, or the radon concentration within V1 is greater than 400... The percentages can all be seen, When the value is 0.5 or 1, it is significantly better than the other three cases, and =1 compared to =0.5 performs slightly better, among which The body / surface average radon concentrations with a value of 1 are all below the safe allowable concentrations, but Radon concentration greater than 400 It accounts for 41.7%. Taking all the above factors into consideration, A value of 1 represents the optimal solution for the upstream air curtain length. V2 refers to the 2-meter volume at the end of the chamber, and Z1 refers to the horizontal interface at the height of the human breathing zone.

[0054] Optimal upstream air curtain length With a value of 1, keep other influencing factors ( It is 0.4. (Keep the value at 0.4) and change the length of the downstream air curtain. Eight different parameter sets were designed: 4, 6, 8, 10, 12, 14, 16, and 18. The simulation results are shown in Figures 3(d) to 3(f), where Figure 3(d) shows the results for each parameter set. Schematic diagram of radon concentration at different X profiles within time V1, Figure 3(e) shows different concentrations. Schematic diagram of average radon concentration, Figure 3(f) shows different When the radon concentration in V1 is greater than 400 Percentage diagram. When When the concentration is less than 10, the airflow does not impact the Z2 surface of the chamber, and a backflow phenomenon occurs prematurely. Most of this backflow forms U-shaped vortices, with a very small portion forming clockwise rotating airflow vortices. This results in less airflow near the Z2 surface of the chamber, leading to a higher surface-average radon concentration in this area. When it is not less than 10, as As the length increases, the distance between the jet outlet and the Z2 face of the chamber decreases, resulting in greater losses due to the jet impacting the Z2 face. This shortens the airflow distance in the recirculation region, leading to a lower surface-average radon concentration near the single-ended face of the chamber. Conversely, as the distance from the single-ended face increases, insufficient airflow results in a higher surface-average radon concentration. When the value is less than 10, the average radon concentration in volume V1 and the average radon concentration in surface Z1 are both lower than those in volume Z1. The concentration of radon is low when the concentration is not less than 10m, but the opposite is true for the average radon concentration in V2 volume. When the average radon concentration of V2 is less than 10, the ratio of V2 to the average radon concentration is less The situation is even more pronounced when the height is not less than 10m. When the value is 4, the airflow near the single-face of the chamber is too small, resulting in excessive radon accumulation, causing the radon concentration in V1 to exceed 400. The percentage is too high; For 6 and Compared to 8, The airflow in the 6th recirculation zone is relatively large, resulting in a high radon emission from the chamber; therefore, the percentage exceeding the safe concentration limit is relatively small. Taking all these factors into consideration, A value of 6 is the optimal solution for the downstream air curtain length.

[0055] At the optimal length =1, With a value of 6, keeping other influencing factors constant ( With a value of 0.4, change the width of the upstream air curtain from the wall. The tunnel width is 3 meters. In order not to affect the operation and production within the tunnel, [the following will be implemented / measured]: The maximum distance was set to 0.8, therefore, three different parameter sets were designed: 0.4, 0.6, and 0.8. The simulation results are shown in Figures 3(g) to 3(i), where Figure 3(g) shows the results for different distances. Schematic diagram of radon concentration at different X profiles within time V1, Figure 3(h) shows different Schematic diagram of average radon concentration, Figure 3(i) shows different When the radon concentration in V1 is greater than 400 Percentage diagram.

[0056] along with The increased width allows more airflow to be drawn into the chamber through the air curtain, because... With the same width, the flow velocity of the jet fluid formed in the inner region of the downstream air curtain is greater, the air volume of the jet fluid forming airflow vortices is greater, and the radon removal rate is faster. However, due to the limited range of the jet fluid, backflow occurs prematurely, reducing the radon removal efficiency near the Z2 face of the chamber. With increasing width, the radon concentration inside the chamber decreased to varying degrees, but The rate of decrease in radon concentration from 0.4 to 0.6 was greater than... The rate of decrease in radon concentration is large from 0.6 to 0.8, and the radon concentration is greater than 400 in V1. In terms of percentage, the former decreased from 30.31% to 15.41%, and the latter decreased from 15.41% to 9.67%. Although For 0.6 and The concentration of 0.8 is within the national safety limits in all aspects, but... A radon concentration of 0.6 is highly efficient in reducing radon concentration; therefore, it is included in this simulation parameter set. Setting 0.6 as the optimal solution not only allows for more space within the main roadway for safe operation and production, but also allows for further optimization. Parameters are used to improve the efficiency of radon reduction.

[0057] At the optimal length =1, It is 6. Under the condition of 0.6, change the width of the downstream air curtain from the wall. The alleyway is 4 meters wide. The maximum distance was set to 0.5, and three different parameter sets were designed: 0.3, 0.4, and 0.5. The simulation results are shown in Figures 3(j) to 3(l), where Figure 3(j) shows the results for different distances. Schematic diagram of radon concentration at different X profiles within time V1, Figure 3(k) shows different Schematic diagram of average radon concentration, Figure 3(l) shows different When the radon concentration in V1 is greater than 400 Percentage diagram.

[0058] when Less than When the airflow moves from a cross-section with a width of 0.4 to a cross-section with a width of 0.3, the cross-sectional area decreases, and the compression of the jet fluid increases the impact force of the airflow, extending the jet region. However, the friction between the airflow and the wall is greater, resulting in more airflow loss. When the concentration is 0.3, the average radon concentration in the X-section is relatively high; when and When they are equal, the cross-sectional area of ​​the jet remains unchanged, and the jet forms a jet region according to the jet velocity, resulting in a backflow phenomenon; when Greater than When the airflow moves from a cross-section with a width of 0.4 to a cross-section with a width of 0.5, the cross-sectional area increases, the jet region of the jet becomes wider, and the recirculation region also increases. The radon concentration in the X-ray profile was low at 0.5. When the value is 0.4, the length of the jet region is relatively small. When the value is 0.3, the jet region is shorter and the width is smaller. When the value is 0.5, it is narrow; therefore, The average radon concentration in V2 is higher when the concentration is 0.4. With... With the increase in width, the average radon concentration in V1, the average radon concentration on the Z1 surface, and the radon concentration within V1 all exceed 400. The percentages all decreased. When the radon concentration is 0.5, the percentage of radon exceeding the standard is 7.92%. Therefore, in this simulation parameter set, [the following parameter will be used]. The optimal value is 0.5.

[0059] The fourth step is to accurately install the air curtain in the target area downhole based on the optimal air curtain parameters obtained from the solution, ensuring that the setting position, size and spacing of the air curtain are consistent with the optimized parameters, so as to provide a guarantee for forming an efficient induced airflow and reducing radon concentration.

[0060] Optionally, with this optimal air curtain parameter, compared to no air curtain, the average radon concentration at the height of the human breathing zone (e.g., 1.6m) inside the chamber decreases from 1260.2%. Reduced to 365 The percentage of areas with excessive radon concentration in the chamber decreased significantly from 99.92% to 7.92%, demonstrating a remarkable radon reduction effect. After implementation of this design, the on-site monitoring data showed good agreement with the simulation results.

[0061] This invention provides a method for radon reduction through ventilation in uranium mine roadways. The method involves acquiring basic parameters of the uranium mine roadway, including ventilation mode and geological and ventilation parameters; calculating the radon release rate of the roadway walls under the current ventilation mode based on the geological and ventilation parameters; determining the required radon exhaust air volume for the uranium mine roadway based on the radon exhaust air volume and the airflow field of the uranium mine roadway; and implementing air curtain-induced ventilation treatment for the uranium mine roadway based on the radon exhaust air volume and the airflow field of the uranium mine roadway. This invention, through its embodiment, uses the basic parameters of uranium mine roadways and current ventilation methods, employs a radon exhalation rate calculation model to accurately calculate the radon exhalation rate on the roadway walls. Furthermore, it directly couples the dynamic radon exhalation rate calculation model in the deep environment of uranium mines with the ventilation engineering design, transforming ventilation volume calculation and measure design from "experience-driven" to "data and model-driven." This improves the scientific rigor and accuracy of ventilation design, avoids "one-size-fits-all" large-volume ventilation, and reduces the energy consumption of the ventilation system while ensuring radon reduction, resulting in significant economic benefits.

[0062] In this embodiment of the invention, the air curtain parameters are optimized by CFD simulation, which can generate the optimal local airflow organization scheme for the geometric structure and airflow field characteristics of a specific chamber or tunnel. This maximizes the reduction of radon concentration in key areas with minimal air volume cost, and solves the dead zone problem that is difficult to handle by traditional global ventilation.

[0063] The embodiments of this invention provide a complete methodology and process from obtaining basic parameters of uranium mine roadways, theoretical calculation of radon exhalation rate, optimization of air curtain simulation to engineering implementation and verification, forming a complete "prediction-design-verification" technical closed loop, which can be extended to ventilation and radon reduction design under various complex working conditions in deep uranium mines.

[0064] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0065] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0066] Figure 4 The diagram shows a structural schematic of a radon reduction ventilation device for a uranium mine tunnel according to an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below: like Figure 4 As shown, the radon reduction ventilation device for uranium mine tunnels includes: an acquisition module 41, a calculation module 42, and a processing module 43.

[0067] Module 41 is used to acquire basic parameters of uranium mine roadways, including ventilation methods and geological and ventilation basic parameters. The calculation module 42 is used to calculate the radon release rate of the wall surface of the uranium mine roadway under the current ventilation mode, based on geological and ventilation parameters. Processing module 43 is used to determine the required radon exhaust volume for the uranium mine roadway based on the radon extinction rate; The processing module 43 is also used to perform air curtain-induced ventilation treatment on the uranium mine roadway based on the radon exhaust volume and the airflow field of the uranium mine roadway.

[0068] In one possible implementation, the geological and ventilation basic parameters include: the permeability of the surrounding rock of the uranium mine tunnel, the porosity of the surrounding rock, the aerodynamic viscosity, the equivalent height of the tunnel burial depth, the tunnel radius, the radon diffusion coefficient, the radon decay constant, the radon production rate of the rock, and the pressure difference between the inside and outside of the tunnel under the current ventilation mode. Module 42, based on geological and ventilation parameters, calculates the radon exhalation rate on the walls of uranium mine roadways under the current ventilation mode. This calculation is used for: The permeability of the surrounding rock in a uranium mine roadway is calculated based on the surrounding rock permeability, surrounding rock porosity, aerodynamic viscosity, equivalent height of the roadway burial depth, roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode. Based on the radon diffusion coefficient and radon decay constant, calculate the diffusion length and diffusion rate of radon in rocks; Based on the surrounding rock infiltration rate, radon diffusion length, radon diffusion coefficient, and radon production rate of the rock, calculate the radon release rate on the wall of the uranium mine roadway under the current ventilation method.

[0069] In one possible implementation, when calculating the permeability of the surrounding rock in a uranium mine roadway based on the surrounding rock permeability, surrounding rock porosity, aerodynamic viscosity, equivalent height of the roadway burial depth, roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode, the calculation module 42 is used for: according to Calculate the permeability of the surrounding rock in a uranium mine tunnel; In the formula, Indicates the permeability of the surrounding rock. Indicates the permeability rate of the surrounding rock. This indicates the air pressure difference between the inside and outside of the tunnel under the current ventilation mode. Indicates aerodynamic viscosity. Indicates the porosity of the surrounding rock. Indicates the equivalent height of the tunnel burial depth. Indicates the radius of the tunnel; In one possible implementation, when the calculation module 42 calculates the radon diffusion length in the rock based on the radon diffusion coefficient and the radon decay constant, it is used for: according to Calculate the diffusion length of radon in the rock; In the formula, This indicates the diffusion length of radon in rocks. This represents the diffusion coefficient of radon in rocks. Represents the radon decay constant; The diffusion rate of radon in rocks is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion rate of radon in rocks; In the formula, This indicates the rate at which radon diffuses in rocks.

[0070] In one possible implementation, when the calculation module 42 calculates the radon exudation rate on the wall of the uranium mine tunnel under the current ventilation mode, based on the surrounding rock infiltration velocity, radon diffusion length, radon diffusion coefficient, and radon production rate of the rock, it is used for: If the current ventilation method is exhaust ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate from the walls of a uranium mine tunnel during exhaust ventilation. Indicates the radon yield of the rock; If the current ventilation method is forced ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate on the walls of a uranium mine tunnel during forced ventilation.

[0071] In one possible implementation, when processing module 43 determines the required radon exhaust volume for the uranium mine roadway based on the radon exhalation rate, it is used for: according to Calculate the required radon exhaust volume for the uranium mine tunnel; In the formula, This indicates the required radon ventilation volume for uranium mine tunnels. This represents the correction factor. The first uranium mine tunnel Radon release rate from the wall surface Indicates the first The area of ​​the wall, Indicates the radon emission concentration limit. This indicates the radon concentration in the incoming air.

[0072] In one possible implementation, when processing module 43 performs air curtain-induced ventilation on the uranium mine roadway based on the radon exhaust volume and the airflow field of the uranium mine roadway, it is used for: Obtain the air volume of the target area in the uranium mine tunnel; If the air volume is less than the radon exhaust volume, or if there is a dead air zone, then the uranium mine roadway should be induced by air curtain ventilation.

[0073] In one possible implementation, when processing module 43 performs air curtain-induced ventilation on uranium mine roadways, it is used for: Air curtains are installed at predetermined locations upstream and downstream of the target area in the uranium mine roadway; A three-dimensional numerical model including tunnels, chambers, and air curtains was established. The objective function of the three-dimensional numerical model is to minimize the average radon concentration at the height of the human breathing zone in the chamber, minimize the proportion of areas with radon concentration exceeding the standard, or maximize the proportion of areas with radon concentration not exceeding the standard. Solve the three-dimensional numerical model to obtain the optimal air curtain parameters; Based on the optimal air curtain parameters, install the air curtain in the target area downhole.

[0074] The above embodiment provides a radon reduction ventilation device for uranium mine roadways. The device acquires basic parameters of the uranium mine roadway, including ventilation mode and geological and ventilation parameters. A calculation module calculates the radon emission rate of the roadway walls under the current ventilation mode based on the geological and ventilation parameters. A processing module determines the required radon exhaust volume for the uranium mine roadway based on the radon emission rate. Based on the radon exhaust volume and the airflow field of the uranium mine roadway, the processing module performs air curtain-induced ventilation treatment on the uranium mine roadway. This invention, through its embodiment, uses the basic parameters of uranium mine roadways and current ventilation methods, employs a radon exhalation rate calculation model to accurately calculate the radon exhalation rate on the roadway walls. Furthermore, it directly couples the dynamic radon exhalation rate calculation model in the deep environment of uranium mines with the ventilation engineering design, transforming ventilation volume calculation and measure design from "experience-driven" to "data and model-driven." This improves the scientific rigor and accuracy of ventilation design, avoids "one-size-fits-all" large-volume ventilation, and reduces the energy consumption of the ventilation system while ensuring radon reduction, resulting in significant economic benefits.

[0075] In this embodiment of the invention, the air curtain parameters are optimized by CFD simulation, which can generate the optimal local airflow organization scheme for the geometric structure and airflow field characteristics of a specific chamber or tunnel. This maximizes the reduction of radon concentration in key areas with minimal air volume cost, and solves the dead zone problem that is difficult to handle by traditional global ventilation.

[0076] The embodiments of this invention provide a complete methodology and process from obtaining basic parameters of uranium mine roadways, theoretical calculation of radon exhalation rate, optimization of air curtain simulation to engineering implementation and verification, forming a complete "prediction-design-verification" technical closed loop, which can be extended to ventilation and radon reduction design under various complex working conditions in deep uranium mines.

[0077] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. For example... Figure 5 As shown, the electronic device 5 of this embodiment includes a processor 50 and a memory 51. The memory 51 stores a computer program 52. When the processor 50 executes the computer program 52, it implements the steps in the various method embodiments described above. Alternatively, when the processor 50 executes the computer program 52, it implements the functions of each module / unit in the various device embodiments described above.

[0078] For example, computer program 52 may be divided into one or more modules / units, which are stored in memory 51 and executed by processor 50 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 52 in electronic device 5.

[0079] Electronic device 5 may include, but is not limited to, processor 50 and memory 51. Those skilled in the art will understand that... Figure 5 This is merely an example of electronic device 5 and does not constitute a limitation on electronic device 5. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 5 may also include input / output devices, network access devices, buses, etc.

[0080] The processor 50 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0081] The memory 51 can be an internal storage unit of the electronic device 5, such as a hard disk or RAM. The memory 51 can also be an external storage device of the electronic device 5, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 51 can include both internal and external storage units of the electronic device 5. The memory 51 is used to store the computer program 52 and other programs and data required by the electronic device 5. The memory 51 can also be used to temporarily store data that has been output or will be output.

[0082] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.

[0083] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0084] This invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0085] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0086] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for ventilating and reducing radon in uranium mine roadways, characterized in that, include: Obtain basic parameters of uranium mine roadways, including ventilation methods and geological and ventilation basic parameters; Based on the aforementioned geological and ventilation parameters, calculate the radon exudation rate on the walls of the uranium mine tunnel under the current ventilation mode; Based on the radon release rate, determine the required radon exhaust volume for the uranium mine tunnel; Based on the radon exhaust volume and the airflow field of the uranium mine roadway, the uranium mine roadway is subjected to air curtain induced ventilation treatment.

2. The radon reduction ventilation method for uranium mine roadways according to claim 1, characterized in that, The geological and ventilation basic parameters include: the permeability of the surrounding rock, the porosity of the surrounding rock, the aerodynamic viscosity, the equivalent height of the roadway burial depth, the roadway radius, the radon diffusion coefficient, the radon decay constant, the radon production rate of the rock, and the air pressure difference inside and outside the roadway under the current ventilation mode. Based on the aforementioned geological and ventilation parameters, calculate the radon exhalation rate of the uranium mine tunnel walls under the current ventilation mode, including: The permeability of the surrounding rock in the uranium mine tunnel is calculated based on the surrounding rock permeability, the surrounding rock porosity, the aerodynamic viscosity, the equivalent height of the tunnel burial depth, the tunnel radius, and the air pressure difference inside and outside the tunnel under the current ventilation mode. Based on the radon diffusion coefficient and the radon decay constant, calculate the diffusion length and diffusion rate of radon in the rock; Based on the surrounding rock infiltration rate, the radon diffusion length, the radon diffusion coefficient, and the radon production rate of the rock, the radon release rate of the uranium mine tunnel wall under the current ventilation mode is calculated.

3. The radon reduction ventilation method for uranium mine roadways according to claim 2, characterized in that, The permeability of the surrounding rock in the uranium mine roadway is calculated based on the surrounding rock permeability, the surrounding rock porosity, the aerodynamic viscosity, the equivalent height of the roadway burial depth, the roadway radius, and the pressure difference between the inside and outside of the roadway under the current ventilation mode. This includes: according to Calculate the permeability of the surrounding rock in the uranium mine tunnel; In the formula, Indicates the permeability of the surrounding rock. Indicates the permeability rate of the surrounding rock. This indicates the air pressure difference between the inside and outside of the tunnel under the current ventilation mode. Indicates aerodynamic viscosity. Indicates the porosity of the surrounding rock. Indicates the equivalent height of the tunnel burial depth. Indicates the radius of the tunnel; The diffusion length of radon in the rock is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion length of radon in rocks; In the formula, This indicates the diffusion length of radon in rocks. This represents the diffusion coefficient of radon in rocks. Represents the radon decay constant; The diffusion rate of radon in rocks is calculated based on the radon diffusion coefficient and the radon decay constant, including: according to Calculate the diffusion rate of radon in rocks; In the formula, This indicates the rate at which radon diffuses in rocks.

4. The radon reduction ventilation method for uranium mine roadways according to claim 3, characterized in that, Based on the surrounding rock infiltration velocity, the radon diffusion length, the radon diffusion coefficient, and the radon production rate of the rock, the radon release rate of the uranium mine tunnel wall under the current ventilation mode is calculated, including: If the current ventilation method is exhaust ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate from the walls of a uranium mine tunnel during exhaust ventilation. Indicates the radon yield of the rock; If the current ventilation method is forced ventilation, then according to Calculate the radon precipitation rate on the walls of the uranium mine tunnel; In the formula, This indicates the radon release rate on the walls of a uranium mine tunnel during forced ventilation.

5. The radon reduction ventilation method for uranium mine roadways according to claim 4, characterized in that, Based on the radon release rate, the required radon exhaust volume for the uranium mine tunnel is determined, including: according to Calculate the required radon exhaust volume for the uranium mine tunnel; In the formula, This indicates the required radon ventilation volume for uranium mine tunnels. This represents the correction factor. The first uranium mine tunnel Radon release rate from the wall surface Indicates the first The area of ​​the wall, Indicates the radon emission concentration limit. This indicates the radon concentration in the incoming air.

6. The radon reduction ventilation method for uranium mine roadways according to claim 5, characterized in that, Based on the radon exhaust volume and the airflow field of the uranium mine roadway, the uranium mine roadway is subjected to air curtain induced ventilation treatment, including: Obtain the air volume of the target area in the uranium mine tunnel; If the air volume is less than the radon exhaust volume, or if there is a dead zone in the airflow, then the uranium mine roadway shall be subjected to air curtain induced ventilation treatment.

7. The method for ventilating and reducing radon in uranium mine roadways according to any one of claims 1-6, characterized in that, The uranium mine roadway is subjected to air curtain induced ventilation treatment, including: Air curtains are installed at predetermined positions upstream and downstream of the target area in the uranium mine roadway; A three-dimensional numerical model is established, which includes the tunnel, the chamber and the air curtain. The objective function of the three-dimensional numerical model is to minimize the average radon concentration in the height plane of the human breathing zone in the chamber, minimize the proportion of the area with radon concentration exceeding the standard, or maximize the proportion of the area with radon concentration not exceeding the standard. Solve the three-dimensional numerical model to obtain the optimal air curtain parameters; Based on the optimal air curtain parameters, install the air curtain in the target area downhole.

8. A radon reduction ventilation device for uranium mine tunnels, characterized in that, include: The acquisition module is used to acquire basic parameters of uranium mine roadways, including ventilation methods and geological and ventilation basic parameters. The calculation module is used to calculate the radon release rate of the wall surface of the uranium mine roadway under the current ventilation mode, based on the geological and ventilation basic parameters. The processing module is used to determine the required radon exhaust volume for the uranium mine roadway based on the radon exhalation rate. The processing module is also used to perform air curtain-induced ventilation treatment on the uranium mine roadway based on the radon exhaust volume and the airflow field of the uranium mine roadway.

9. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 7.

Images