Compressed air energy storage cavern construction feasibility comprehensive evaluation method considering multiple factors

Abstract

The invention provides a compressed air energy storage cavern construction feasibility comprehensive evaluation method considering multiple factors, and the method comprises the steps: firstly, analyzing a power generation demand, a construction condition and a rock geological condition, and determining the maximum storage energy and the maximum internal air pressure of a cavern; then, carrying out cave storage arrangement and structural scheme design, namely preliminarily calculating the cave storage air volume, the burying depth and the vertical shaft section diameter, and designing a sealing support structure and a material; then, calculating material, equipment and labor cost, including the excavation cost of a cave and a vertical shaft and the cost of a sealing support structure; then, the construction cost of the gas storage cavern is evaluated; and then, evaluating the difficulty of the project, and carrying out comparative analysis. According to the provided evaluation method, the safety and stability of construction of the compressed air energy storage cavern and the economical efficiency of engineering are considered, the simplicity, convenience and universality of comprehensive evaluation are improved, and the evaluation method is suitable for construction feasibility evaluation of the underground gas storage cavern under different geological conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure energy storage engineering, and in particular provides a comprehensive evaluation method for the feasibility of compressed gas energy storage cavern construction taking multiple factors into consideration. Background Art

[0002] Compressed air energy storage is a highly efficient energy storage measure, and its ability to achieve peak load shaving and valley filling in power grids has attracted widespread attention from scholars. Underground lined compressed air energy storage caverns stand out among many gas storage methods due to their wide range of sites and high applicable pressure. It is particularly important to find a simple and universal engineering feasibility assessment method in many engineering geological conditions.

[0003] At present, the construction of underground gas storage caverns under different geological conditions usually focuses on its stability, but the difficulty of its engineering construction and economic feasibility are insufficient. The stress conditions of gas storage caverns during service are different from those of conventional tunnels. Their burial depth, cavern cross-sectional dimensions, support forms, etc. are also quite different from those of conventional tunnels. Conventional tunnel engineering feasibility study methods cannot be directly used. Therefore, a new feasibility and economic evaluation method for the construction of gas storage caverns is needed.

[0004] At present, scoring evaluation method, cost-benefit method or investment payback period analysis method are commonly used for project feasibility analysis. Since compressed air energy storage has not yet been commercialized in China and there is a lack of sufficient pilot project samples for comparative analysis, these methods are not completely applicable. Summary of the invention

[0005] Based on this, the present invention provides a comprehensive evaluation method for the feasibility of compressed gas energy storage cavern construction that takes into account multiple factors, so as to consider the safety and stability of compressed gas energy storage cavern construction and the economy of the project. It is suitable for the construction of underground gas storage caverns under different geological conditions, and improves the simplicity and universality of the comprehensive evaluation.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a method for comprehensively evaluating the feasibility of compressed gas energy storage cavern construction taking into account multiple factors, comprising the following steps: S100. Analyze power generation demand, construction conditions and rock mass geological conditions to determine the maximum storage energy and maximum internal gas pressure of the cavern; S200. Design the layout and structure of the storage, including preliminary calculation of the air volume, burial depth and shaft section diameter of the storage, and design of sealing support structure and materials; S300. Calculate the cost of materials, equipment and labor, including the cost of excavation of the cavern and shaft, and the cost of sealing support structures; S400. Conduct cost assessment of gas storage chambers; S500. Evaluate the difficulty of the project and conduct feasibility analysis of the project.

[0007] Furthermore, the maximum storage energy of the cavern to be built is determined according to the power generation demand; the maximum internal gas pressure of the cavern is determined according to the technical requirements; and geological surveys are carried out based on the preliminary site selection to obtain physical and mechanical parameters including surrounding rock grade, density and shear strength.

[0008] Furthermore, in the process of preliminary site selection, the geological condition lower limit is determined based on the surrounding rock grade. Sites that do not meet the geological condition lower limit are not selected. The lower limit of the selected geological condition is the poorer secondary surrounding rock. The third-level and lower surrounding rock is not selected as the site for the gas storage. A pre-assessment method for the lower limit of geological conditions is introduced, that is, engineering geological conditions below the level of the surrounding rock can be quickly excluded. The selection of the lower limit of geological conditions is based on the numerical simulation results of typical formations of the first to fifth levels of surrounding rock, which ensures the scientific nature of the judgment criteria.

[0009] Furthermore, according to the given maximum storage energy and the designed maximum internal air pressure, the air storage volume of the cavern is determined using formula (1): (1) In formula (1), For maximum stored energy; is the maximum internal air pressure; is one standard atmospheric pressure; is the gas storage volume; is the cross-sectional radius of the gas storage chamber, which is a variable. According to the axisymmetric assumption of elastic mechanics, the maximum value of the radius is 1 / 20 of the burial depth, that is, ; is the length of the gas storage chamber, which is a variable.

[0010] Furthermore, the elastoplastic method is used to determine the minimum safe burial depth of the cavern. Formula (2) is: (2) In formula (2), is the minimum safe burial depth, The surrounding rock mass is heavy. is the cohesion of surrounding rock, is the internal friction angle of the surrounding rock. The elastic-plastic mechanics method for calculating the buried depth under a given gas storage pressure improves the existing various limit equilibrium methods that ignore the cracking of the surrounding rock of the cave wall.

[0011] Furthermore, the shaft form is selected as a vertical circular cross-section shaft, and the cavern form is selected as a circular cross-section tunnel-shaped cavern; the cavern sealing support form is designed, high-strain concrete is used as the lining material, the lining layer is cast as a whole on the inner surface of the surrounding rock, and then a multi-layer aluminum foil sealing layer is pasted on the inner surface of the lining layer, the lining thickness is determined according to the surrounding rock grade, and the number of multi-layer aluminum foil sealing layers is determined.

[0012] Furthermore, the cost of the mine is determined to include the mine excavation cost, the sealing support structure cost and the shaft construction cost, and the basic cost formula for cost calculation is listed (3): (3) In formula (3), is the excavation cost item, is the cost item of the sealing support structure, is the cost item for shaft construction; among which, the excavation cost item It is related to ground conditions, burial depth, excavation labor costs, excavation equipment costs, excavation size and excavation length; sealing support cost item Related to the cost of sealing support materials, thickness of sealing support layer, cross-sectional dimensions of the storage, and length of the storage; shaft construction cost item It is related to the burial depth and the cross-sectional size of the shaft; the calculation method of each item in the cost function is relatively flexible. The method exemplified in the present invention is a linear relationship, and a more precise functional relationship can also be considered, but this may cause the cost function to become complicated and the extreme value to be more difficult to calculate.

[0013] Furthermore, based on the basic cost formula (3), the specific cost formula (4) is further refined: (4) In formula (4), is the correlation coefficient between the excavation cost of the cavern and the ground conditions; is the correlation coefficient between the excavation cost and the burial depth of the cavern; Z is the buried depth of the gas storage chamber; is the correlation coefficient between excavation cost and excavated rock volume, the former is the labor cost coefficient, and the latter is the machinery cost coefficient; is the cost factor for shaft excavation and support that increases according to depth; is the shaft section radius; is the cost coefficient of sealing support materials; is the construction cost coefficient of the sealing support structure; is the thickness of the sealing support structure. Further, the specific cost function is converted into the cost function: (5) The cost function is used as the objective function, and the minimum value of the objective function is taken to obtain the minimum cost under the working condition. The size of the cavern when the minimum cost is obtained is determined, including the cavern diameter and cavern length.

[0014] At this time, the cost function is written in the form of formula (5), which is a binary function of the radius and length of the cavern. Since these two variables satisfy the relationship of formula (1), the cost function is essentially a univariate function. By determining the boundary conditions and simplifying the assumptions of the influencing factors, the cost function is expressed as a univariate explicit function, which is convenient for judging the influence of various factors on the cost. At the same time, this method comprehensively considers the costs of various links in the construction process of the gas storage cavern that vary with different working conditions, ignoring the basically irrelevant costs, solving the problem that the existing construction cost software is cumbersome and inconvenient in evaluating the project cost, and also ensures the scientific nature of the evaluation method.

[0015] The cost function can be used for site selection, sealing support selection, cavern layout parameter selection, and even excavation method selection. Many coefficients in the proposed cost function can be quickly determined through existing engineering cost cases or cost software. Some parameters required by the cost function are related, which makes it easier to determine the extreme value of the objective function by requiring fewer parameters in the final calculation.

[0016] Furthermore, in the process of evaluating the difficulty of the project, when there are multiple addresses and multiple different support forms to choose from, the cost function method is used to calculate the minimum value, evaluate the construction difficulty, and make comparisons and selections. The proposed cost function can be used as an overall cost estimation method to conveniently estimate the cost of energy storage power stations after fully considering the costs of other parts, such as plant buildings, gas storage equipment, and pipelines.

[0017] Compared with the prior art, the technical advantages of the comprehensive feasibility assessment method for compressed gas energy storage cavern construction considering multiple factors provided by the present invention are at least reflected in: 1. Taking into account the formation conditions and power generation needs, the construction difficulty of building an artificial cavern was quantitatively evaluated from the perspective of engineering cost, and the safe burial depth was determined using the elastic-plastic method. The construction cost of the cavern was converted into a function of the cavern length and diameter. While determining the most suitable construction plan, the size of the cavern was determined. Not only stability was considered, but also the economy of the project was guaranteed; 2. A fast and simple cost function evaluation method is provided. By determining the boundary conditions and simplifying the assumptions of the influencing factors, the cost function is expressed as a univariate explicit function, which is convenient for judging the influence of various factors on the cost. At the same time, this method comprehensively considers the costs of various links in the construction process of the gas storage tank that vary with different working conditions, ignoring the basically irrelevant costs, solving the problem that the existing construction cost software is cumbersome and inconvenient in evaluating the project cost, and also ensures the scientific nature of the evaluation method. 3. Many coefficients in the proposed cost function can be quickly determined through existing engineering cost cases or cost software. Some parameters required by the cost function are related, so that fewer parameters need to be determined in the final calculation, and it is more convenient to determine the extreme value of the objective function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the principle of a comprehensive feasibility assessment method for compressed gas energy storage cavern construction that takes multiple factors into consideration; Figure 2 It is a flowchart of a comprehensive feasibility assessment method for compressed gas energy storage cavern construction that takes multiple factors into consideration; Figure 3 It is a specific implementation process framework of the comprehensive feasibility assessment method for compressed gas energy storage cavern construction that considers multiple factors. DETAILED DESCRIPTION

[0020] At present, the construction of underground gas storage caverns under different geological conditions usually focuses on its stability, but the difficulty of its construction and economic feasibility are not well studied. The stress conditions of gas storage caverns during service are different from those of conventional tunnels. Their burial depth, cavern cross-sectional dimensions, and support forms are also quite different from those of conventional tunnels. Conventional tunnel engineering feasibility study methods cannot be directly used. Therefore, a new feasibility and economic evaluation method for the construction of gas storage caverns is needed.

[0021] Therefore, the present invention provides a comprehensive evaluation method for the feasibility of compressed gas energy storage cavern construction that takes into account multiple factors. First, the power generation demand, construction conditions and rock geological conditions are analyzed to determine the maximum storage energy and maximum internal air pressure of the cavern; then, the cavern layout and structural scheme design are carried out, including preliminary calculation of the cavern air volume, burial depth and shaft cross-sectional diameter, and design of sealing support structure and materials; then, the material, equipment and labor costs are calculated, including the cavern and shaft excavation costs, and the sealing support structure costs; then, the cost of the gas storage cavern is evaluated; then, the difficulty of the project is evaluated, and a comparative analysis is performed.

[0022] The provided evaluation method takes multiple factors into consideration and is easy to calculate. It is convenient for evaluating the difficulty of constructing gas storage caverns under different geological conditions, and takes into account the safety and stability of compressed gas energy storage cavern construction and the economy of the project. It improves the simplicity and universality of the comprehensive evaluation and is suitable for the feasibility evaluation of underground gas storage caverns under different geological conditions.

[0023] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present disclosure.

[0024] like Figure 1 and Figure 2 As shown, the present invention provides a comprehensive evaluation method for the construction feasibility of compressed gas energy storage caverns considering multiple factors, including the following steps: S100. Analyze power generation demand, construction conditions and rock mass geological conditions to determine the maximum storage energy and maximum internal gas pressure of the cavern; S200. Design the layout and structure of the storage, including preliminary calculation of the air volume, burial depth and shaft section diameter of the storage, and design of sealing support structure and materials; S300. Calculate the cost of materials, equipment and labor, including the cost of excavation of the cavern and shaft, and the cost of sealing support structures; S400. Conduct cost assessment of gas storage chambers; S500. Evaluate the difficulty of the project and conduct feasibility analysis of the project.

[0025] The provided evaluation method takes into account the safety and stability of compressed gas energy storage cavern construction and the economy of the project. It is applicable to the construction of underground gas storage caverns under different geological conditions and improves the simplicity and universality of the comprehensive evaluation.

[0026] like Figure 3 As shown in the figure, during the implementation process, for the gas storage project to be built, it is necessary to first clarify that the power generation demand is usually given as the maximum storage energy of the cavern; the technical requirements usually give the maximum internal gas pressure of the cavern; the approximate site selection range is usually given and detailed geological surveys are carried out to obtain physical and mechanical parameters such as surrounding rock grade, density and shear strength. These indicators will provide a basis for determining the parameters in the objective function.

[0027] The geological condition lower limit is determined based on the formation surrounding rock grade. Sites that do not meet the geological condition lower limit are not recommended for selection. Further cost comparison based on the objective function is recommended. The lower limit of geological conditions is the poorer secondary surrounding rock. Level 3 and below surrounding rock is not recommended for gas storage site selection. A pre-assessment method for the lower limit of geological conditions is introduced, that is, engineering geological conditions below level II surrounding rock can be quickly excluded. The selection of the lower limit of geological conditions is based on the numerical simulation results of typical formations of level 1 to 5 surrounding rock, which ensures the scientific nature of the judgment criteria.

[0028] According to the given maximum storage energy and the designed maximum internal air pressure, the storage volume of the cavern is determined by formula (1). It is recommended to determine the minimum safe burial depth of the cavern by the elastic-plastic method, as shown in formula (2).

[0029] (1) In formula (1) For maximum stored energy; is the maximum internal air pressure; is one standard atmospheric pressure; is the gas storage volume; is the cross-sectional radius of the gas storage chamber, which is a variable. According to the axisymmetric assumption of elastic mechanics, the maximum value of the radius is 1 / 20 of the burial depth, that is, ; is the length of the gas storage chamber, which is a variable.

[0030] (2) In formula (2) is the minimum safe burial depth, The surrounding rock mass is heavy. is the cohesion of surrounding rock, is the internal friction angle of the surrounding rock. The above formula includes an elastic-plastic mechanics method for calculating the burial depth under a given gas storage pressure, which improves the problem of various existing limit equilibrium methods that ignore the cracking of the surrounding rock of the cave wall.

[0031] The recommended shaft form is a vertical circular cross-section shaft, and the recommended cavern form is a circular cross-section tunnel-shaped cavern.

[0032] The form of sealing support for the mine can be selected according to actual needs, or it can be selected according to the form recommended by the present invention. The form of sealing support recommended by the present invention is to use high-strain-strengthened UHPC concrete as the lining material, and integrally cast the lining layer on the inner surface of the surrounding rock; then paste a multi-layer aluminum foil sealing layer on the inner surface of the lining layer. For secondary and above surrounding rock, at the minimum safe burial depth recommended by the present invention, the surrounding rock has good integrity and maintains elasticity, and the recommended lining thickness is 0.2m; for tertiary surrounding rock, it is not suitable to select a site. If construction is required, the recommended lining thickness is 2m. Thicker lining can ensure the stability of the surrounding rock and lining. The recommended number of layers of multi-layer aluminum foil for the sealing layer is 5, and the recommended cross-sectional diameter of the shaft is 2m, which can be adjusted according to actual conditions.

[0033] Furthermore, during the implementation process, on the premise of giving the approximate scope of the site selection for the underground compressed air energy storage chamber, conducting geological surveys, and determining the maximum storage energy requirements, a cost function is proposed by comprehensively considering the costs of excavation, support, and shaft construction. The difficulty of building the chamber is quantified through the cost function, and the design parameters such as the length and cross-sectional dimensions of the chamber with the lowest cost (most suitable for construction) are determined by analyzing the cost function, providing a basis for the construction plan of the chamber.

[0034] After all parameters are determined, they are substituted into the cost function. The cost function proposed in the present invention includes three parts, namely, the cost of cavern excavation, the cost of sealing support structure and the cost of shaft construction. Note that the cost function of the present invention does not take into account the cost of other facilities such as factory buildings and gas pipelines that are less relevant to the construction difficulty. Therefore, the cost function of the present invention is only suitable for the evaluation of the construction difficulty and should not be directly used to calculate the complete cost of the gas storage cavern. The basic cost formula (3) of the present invention is: (3) In formula (3), is the excavation cost item, is the cost item of the sealing support structure, Cost item for shaft construction.

[0035] Determine the variables and parameters of each item in the cost function, among which the excavation cost It is related to the ground conditions, burial depth, excavation labor costs, excavation equipment costs, excavation size and excavation length. It can be calculated according to the method recommended by this invention or selected according to the actual situation. Sealing support cost It is related to the cost of sealing support materials, thickness of sealing support layer, cross-sectional dimensions of the cavern and length of the cavern, and can be calculated according to the method recommended by the present invention or selected based on actual conditions; the cost of shaft construction is related to the burial depth and cross-sectional dimensions of the shaft, and can be calculated according to the method recommended by the present invention or selected based on actual conditions.

[0036] The recommended cost function adopts a simplified calculation method. All influencing factors are considered to be linear. The excavation cost increases linearly with the burial depth, the surrounding rock strength, and the excavation cross-sectional area. The cost of sealing support materials increases linearly with the volume of materials used and the inner surface area of ​​the surrounding rock of the constructed cavern. The cost of the shaft increases linearly with the excavation depth and cross-sectional area. The calculation method of each item in the cost function is shown in the specific formula (4).

[0037] (4) in: is the correlation coefficient between the excavation cost of the cavern and the ground conditions; is the correlation coefficient between the excavation cost and the burial depth of the cavern; Z is the buried depth of the gas storage chamber; is the correlation coefficient between excavation cost and excavated rock volume, the former is the labor cost coefficient, and the latter is the machinery cost coefficient; is the cost factor for shaft excavation and support that increases according to depth; is the shaft section radius; is the cost coefficient of sealing support materials; is the construction cost coefficient of the sealing support structure; is the thickness of the sealing support structure.

[0038] The above specific cost formula proposed can be used for site selection, sealing support selection, cavern layout parameter selection, and even excavation method selection. The calculation method of each item in the proposed cost function is relatively flexible. The method exemplified in the present invention is a linear relationship, and a more accurate functional relationship can also be considered, but this may make the cost function complicated and the extreme value more difficult to calculate.

[0039] (5) Taking the cost function as the objective function and taking the minimum value of the objective function, we can get the minimum cost under the working condition, and at the same time determine the size of the tunnel when the minimum cost is taken, including the tunnel diameter and length. At this time, the cost function is written in the form of a formula, which is a function about the tunnel radius And the length of the warehouse If the cost function is a binary function, and the two variables satisfy the relationship of formula (1), then the cost function is essentially a univariate function.

[0040] The cost function provided can be used as an overall cost estimation method to conveniently estimate the cost of energy storage power stations after fully considering the costs of other parts, such as plant buildings, gas storage equipment, pipelines, etc. When there are multiple plant sites and multiple different support forms to choose from, the cost function method proposed in this invention can be used to calculate the minimum value, evaluate the construction difficulty, and conduct comparison and feasibility analysis.

[0041] The evaluation method provided by the present invention draws on the analytical thinking of the cost-effectiveness method, takes the energy storage demand as the boundary condition, comprehensively considers the influence of the formation conditions and the cavern construction plan, and proposes a method for estimating the construction cost of the project. Compared with the conventional scoring evaluation method, it reduces its subjectivity and dependence on a large amount of existing engineering experience, and quantitatively analyzes the feasibility of the project in a concise and clear cost function.

[0042] Based on the above embodiments, a comprehensive feasibility assessment method for compressed gas energy storage cavern construction considering multiple factors is provided. The formation conditions, i.e., power generation demand, are comprehensively considered, and the construction difficulty of building an artificial cavern is quantitatively assessed from the perspective of engineering cost. The safe burial depth is determined using the elastic-plastic method, and the construction cost of the cavern is converted into a function of the cavern length and diameter. While determining the most suitable construction plan, the size of the cavern is determined. Not only stability is considered, but also the economy of the project is guaranteed.

[0043] The comprehensive feasibility assessment method for compressed gas energy storage cavern construction that considers multiple factors provided by the present invention quantifies the difficulty of gas storage cavern construction into a cost function, which can not only quickly and clearly determine the key factors that have a greater impact on the cost, but also optimize these key indicators when performing extreme value analysis on the function, thereby providing a basis for decision-making in the construction of artificial gas storage cavern projects.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A comprehensive feasibility assessment method for compressed gas energy storage cavern construction considering multiple factors, characterized in that: include: S100. Analyze power generation demand, construction conditions and rock mass geological conditions to determine the maximum storage energy and maximum internal gas pressure of the cavern; S200. Design the layout and structure of the storage, including preliminary calculation of the air volume, burial depth and shaft section diameter of the storage, and design of sealing support structure and materials; S300. Calculate the cost of materials, equipment and labor, including the cost of excavation of the cavern and shaft, and the cost of sealing support structures; S400. Conduct cost assessment of gas storage chambers; S500. Evaluate the difficulty of the project and conduct comparative analysis.

2. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 1 is characterized in that: Determine the maximum storage capacity of the cavern to be built according to power generation demand; determine the maximum internal gas pressure of the cavern according to technical requirements; Based on the preliminary site selection, geological survey is carried out to obtain the physical and mechanical parameters including surrounding rock grade, density and shear strength.

3. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 2 is characterized in that: During the preliminary site selection process, the geological condition lower limit is determined based on the surrounding rock grade. Sites that do not meet the geological condition lower limit will not be selected. The selected geological condition lower limit is the poor secondary surrounding rock. Level 3 and below surrounding rock will not be selected as gas storage sites.

4. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 1 is characterized in that: Based on the given maximum storage energy and the designed maximum internal air pressure, the air storage volume of the cavern is determined using formula (1): (1) In formula (1), For maximum stored energy; is the maximum internal air pressure; is one standard atmospheric pressure; is the gas storage volume; is the cross-sectional radius of the gas storage chamber, which is a variable. According to the axisymmetric assumption of elastic mechanics, the maximum value of the radius is 1 / 20 of the burial depth, that is, ; is the length of the gas storage chamber, which is a variable.

5. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 1 or 4, characterized in that: Using the elastoplastic method, the minimum safe burial depth of the cavern is determined. Formula (2) is: (2) In formula (2), is the minimum safe burial depth, The surrounding rock mass is heavy. is the cohesion of surrounding rock, is the internal friction angle of the surrounding rock.

6. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 1 is characterized in that: The shaft form is selected as a vertical circular cross-section shaft, and the cavern form is selected as a circular cross-section tunnel-shaped cavern; the cavern sealing support form is designed, high-strain concrete is used as the lining material, the lining layer is cast as a whole on the inner surface of the surrounding rock, and then a multi-layer aluminum foil sealing layer is pasted on the inner surface of the lining layer. The lining thickness is determined according to the surrounding rock grade, and the number of multi-layer aluminum foil sealing layers is determined.

7. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 1 is characterized in that: The cost of the mine storage includes the mine storage excavation cost, the sealing support structure cost and the shaft construction cost. The basic cost formula for cost calculation is listed as follows (3): (3) In formula (3), is the excavation cost item, is the cost item of the sealing support structure, is the cost item for shaft construction; among which, the excavation cost item It is related to ground conditions, burial depth, excavation labor costs, excavation equipment costs, excavation size and excavation length; sealing support cost item Related to the cost of sealing support materials, thickness of sealing support layer, cross-sectional dimensions of the storage, and length of the storage; shaft construction cost item Related to the burial depth and cross-sectional dimensions of the shaft.

8. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 7 is characterized in that: Based on the basic cost formula (3), the specific cost formula (4) is further refined: (4) In formula (4), is the correlation coefficient between the excavation cost of the cavern and the ground conditions; is the correlation coefficient between the excavation cost and the burial depth of the cavern; Z is the buried depth of the gas storage chamber; is the correlation coefficient between excavation cost and excavated rock volume, the former is the labor cost coefficient, and the latter is the machinery cost coefficient; is the cost factor for shaft excavation and support that increases according to depth; is the shaft section radius; is the cost coefficient of sealing support materials; is the construction cost coefficient of the sealing support structure; is the thickness of the sealing support structure.

9. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 8 is characterized in that: Convert the specific cost function into the cost function: (5) The cost function is used as the objective function, and the minimum value of the objective function is taken to obtain the minimum cost under the working condition. The size of the cavern when the minimum cost is obtained is determined, including the cavern diameter and cavern length.

10. The method for comprehensive feasibility assessment of compressed gas energy storage cavern construction considering multiple factors according to claim 9 is characterized in that: In the process of evaluating the difficulty of the project, when there are multiple addresses and multiple different support forms to choose from, the minimum value is calculated through the cost function method, the construction difficulty is evaluated, and a comparative analysis is performed.

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