Tunnel type compressed air energy storage underground chamber buried depth determination method and system
Patent Information
- Application Number
- CN202611139986.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-30
- Publication Date
- 2026-10-16
AI Technical Summary
然而，现有方法存在以下不足：一是模型复杂、参数繁多，通常需要借助计算机采用初值迭代法求解，难以满足工程设计人员进行快速工程评估的需要；二是对不同风化程度岩层（强风化、中风化、微风化）的力学贡献差异化处理不够精细，忽略了强风化岩层抗拉强度可忽略的工程实际；三是对隧道式硐室特殊几何形态（圆柱形长轴截面）的高压气体上抬力计算不够准确，缺乏基于解析积分的精确计算方法
本发明所述的上述方案，通过引入基于内摩擦角的破裂角确定方法，将复杂的岩体破坏模式抽象为明确的倒棱台形破坏锥体模型，并结合分层岩体的自重应力和抗拉强度贡献精确量化抗力，实现了上抬力与抗力平衡关系的科学表征，有效解决了埋深过浅导致围岩抬升密封失效、以及埋深过大造成建设成本剧增的双重技术难题；确定方法参数获取便捷、计算路径清晰，各岩层力学参数均可通过常规岩土勘察和室内试验获取，避免了传统复杂模型依赖计算机初值迭代求解的弊端，真正适用于工程实践中的快速设计。
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Abstract
Description
Technical Field
[0001] This invention relates to the technical field of calculating the burial depth of underground tunnels, and particularly to a method and system for determining the burial depth of underground tunnels for compressed air energy storage. Background Technology
[0002] Compressed air energy storage (CASS) is a large-scale, long-term energy storage technology primarily used to address the intermittency and instability of renewable energy generation such as wind and solar power, thereby achieving peak shaving and valley filling for the power grid. Underground gas storage chambers are the core facilities of a CASS system for storing high-pressure air, and their performance directly determines the system's safety, airtightness, and economy. Common underground gas storage chamber types include two main categories: one is a salt rock cavity, which utilizes a water-soluble cavity-forming process to create a gas storage space within a salt rock layer; the other is a tunnel-type chamber, which is artificially excavated in hard rock layers such as granite to form a cylindrical gas storage space with a circular cross-section. Its axis is horizontally arranged, offering strong applicability and engineering feasibility. Both types of chambers must be buried in intact rock mass at a certain depth, relying on the self-weight of the overlying rock mass and the tensile strength of the rock to resist the upward force of the internal high-pressure gas, preventing surrounding rock instability and high-pressure gas leakage.
[0003] The burial depth of a tunnel-type underground gas storage chamber is one of the most critical parameters in engineering design. Insufficient burial depth can lead to two serious consequences: First, uplift and damage to the surrounding rock. When the internal pressure of the chamber exceeds the bearing capacity of the overlying rock mass, the high-pressure gas may push up the overlying rock strata, causing surface uplift, rock strata fracturing, and even explosive instability. Second, sealing failure. Under shallow burial conditions, the surrounding rock undergoes elastic deformation under high pressure, and the expansion of micro-fractures may cause high-pressure air to leak along the fractures to the surface or shallow aquifers, resulting in a sharp decline in energy storage efficiency. However, excessive burial depth also brings engineering problems such as a sharp increase in construction costs, increased geological uncertainty, and increased auxiliary energy consumption. Therefore, rationally determining the minimum safe burial depth of the chamber is of great significance for ensuring the safe operation of the project and controlling construction costs.
[0004] In existing technologies, the main method for determining the burial depth of underground gas storage chambers is to use a cone failure model based on limit equilibrium theory, establish a friction-cohesion failure criterion, and use the limit equilibrium method and passive rock and soil pressure theory to inversely deduce the safe burial depth by calculating the safety factor of the overlying rock mass. However, existing methods have the following shortcomings: First, the models are complex and have numerous parameters, usually requiring the use of computers and initial value iteration methods for solution, which is difficult to meet the needs of engineering designers for rapid engineering assessment; second, the differential treatment of the mechanical contributions of rock strata with different weathering degrees (strongly weathered, moderately weathered, and slightly weathered) is not refined enough, ignoring the engineering reality that the tensile strength of strongly weathered rock strata is negligible; third, the calculation of the high-pressure gas uplift force of the special geometry of tunnel-type chambers (cylindrical long axis section) is not accurate enough, and there is a lack of precise calculation methods based on analytical integrals. Summary of the Invention
[0005] This invention provides a method and system for determining the burial depth of underground tunnels for compressed air energy storage, which can efficiently determine the minimum safe burial depth of the tunnel that meets stability requirements.
[0006] This invention provides a method for determining the burial depth of an underground tunnel-type compressed air energy storage chamber, comprising the following steps: The geotechnical parameters and chamber geometry information are obtained. The geotechnical parameters include the unit weight of various types of rocks, the depth of slightly weathered rocks, the thickness of moderately weathered rock layers, the thickness of strongly weathered rock layers, the internal friction angle of moderately weathered rock layers, and the internal friction angle of slightly weathered rock layers. The chamber geometry information includes the chamber diameter, chamber length, and maximum internal pressure. Based on the geometric information of the chamber, the uplift force of the high-pressure gas in the overlying strata is determined; The fracture angle of slightly weathered rock strata is determined based on the internal friction angle of slightly weathered rock strata; the fracture angle of moderately weathered rock strata is determined based on the internal friction angle of moderately weathered rock strata. The failure cone is determined based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer. Based on the failure cone, soil and rock parameter information, and chamber geometry information, the self-weight stress of the failure cone of each rock layer is determined respectively; Based on the aforementioned geotechnical parameters, the fracture angle of moderately weathered rock strata, and the fracture angle of slightly weathered rock strata, the tensile strength of the rock strata is determined. The burial depth of the chamber is determined based on the tensile strength of the rock strata, the self-weight stress of the failure cones of each rock strata, and the uplift force.
[0007] Optionally, based on the chamber geometry, the high-pressure gas uplift force of the overlying strata is determined, including: The uplift force of high-pressure gas in the overlying strata is determined based on the chamber diameter, chamber length, and maximum internal pressure.
[0008] Optionally, the fracture angle of the slightly weathered rock layer is determined based on the internal friction angle of the slightly weathered rock layer; the fracture angle of the moderately weathered rock layer is determined based on the internal friction angle of the moderately weathered rock layer, including: according to Determine the fracture angle of the slightly weathered rock strata, among which, The fracture angle of the slightly weathered rock strata. The friction angle within the slightly weathered rock layer; according to Determine the fracture angle of moderately weathered rock strata, among which, The fracture angle of moderately weathered rock strata. This represents the internal friction angle of moderately weathered rock strata.
[0009] Optionally, the failure cone is determined based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer, including: The width of the top of the slightly weathered layer is determined based on the depth of the slightly weathered rock, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The width of the top of the moderately weathered layer is determined based on the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the depth of the slightly weathered rock layer, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The destruction cone is determined based on the spread width of the top of the slightly weathered layer and the spread width of the top of the moderately weathered layer.
[0010] Optionally, based on the failure cone, soil and rock parameter information, and chamber geometry information, the self-weight stress of each rock stratum failure cone is determined, including: The self-weight stress of the strongly weathered rock layer is determined based on the unit weight of the strongly weathered rock layer, the thickness of the strongly weathered rock layer, and the width of the top of the moderately weathered layer. The self-weight stress of the moderately weathered rock layer is determined based on the specific gravity of the moderately weathered rock layer, the thickness of the moderately weathered rock layer, the width of the top of the slightly weathered layer, and the width of the top of the moderately weathered layer. The self-weight stress of the slightly weathered rock layer is determined based on the specific gravity of the slightly weathered rock layer, the depth of the slightly weathered rock, the width of the top of the slightly weathered layer, and the diameter of the chamber.
[0011] Optionally, the tensile strength of the rock strata is determined based on the aforementioned geotechnical parameters, the fracture angle of moderately weathered rock strata, and the fracture angle of slightly weathered rock strata, including: Obtain the tensile strength of slightly weathered rock strata, the tensile strength of moderately weathered rock strata, and the preset safety reserve factor; The tensile strength of the rock layer is determined based on the depth of the slightly weathered rock layer, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the fracture angle of the slightly weathered rock layer, the tensile strength of the slightly weathered rock layer, the tensile strength of the moderately weathered rock layer, and the preset safety reserve coefficient.
[0012] Optionally, the burial depth of the chamber is determined based on the tensile strength of the rock strata, the self-weight stress of the failure cone of each rock stratum, and the uplift force, including: The resistance is determined based on the self-weight stress of the strongly weathered rock layer, the self-weight stress of the moderately weathered rock layer, the self-weight stress of the slightly weathered rock layer, and the tensile strength of the rock layer. If the resistance is less than the uplift force, then increase the depth of the slightly weathered rock and redetermine it; If the resistance is greater than the uplift force, and the difference between the resistance and the uplift force accounts for more than 5% of the uplift force, then the depth of slightly weathered rock should be reduced and redefined. When the resistance is not less than the uplift force, and the difference between the resistance and the uplift force accounts for no more than 5% of the uplift force, the iteration is terminated and the current depth of slightly weathered rock is output. The burial depth of the chamber is determined based on the thickness of the moderately weathered rock layer, the thickness of the strongly weathered rock layer, and the current depth of the slightly weathered rock.
[0013] Embodiments of the present invention also provide a system for determining the burial depth of a tunnel-type compressed air energy storage underground chamber, comprising: The acquisition module is used to acquire soil and rock parameter information and chamber geometry information. The soil and rock parameter information includes the unit weight of various types of rocks, the depth of slightly weathered rocks, the thickness of moderately weathered rock layers, the thickness of strongly weathered rock layers, the internal friction angle of moderately weathered rock layers, and the internal friction angle of slightly weathered rock layers. The chamber geometry information includes the chamber diameter, chamber length, and maximum internal pressure. The processing module is used to determine the high-pressure gas uplift force of the overlying rock strata based on the geometric information of the chamber; determine the fracture angle of the slightly weathered rock strata based on the internal friction angle of the slightly weathered rock strata; determine the fracture angle of the moderately weathered rock strata based on the internal friction angle of the moderately weathered rock strata; determine the failure cone based on the depth of the slightly weathered rock strata, the thickness of the moderately weathered rock strata, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; determine the self-weight stress of each rock strata failure cone based on the failure cone, the rock and soil parameter information, and the geometric information of the chamber; determine the tensile strength of the rock strata based on the rock and soil parameter information, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; and determine the burial depth of the chamber based on the tensile strength of the rock strata, the self-weight stress of each rock strata failure cone, and the uplift force.
[0014] Embodiments of the present invention also provide a computing device, including: a processor and a memory storing a computer program, wherein the computer program, when executed by the processor, performs the method described above.
[0015] Embodiments of the present invention also provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method described above.
[0016] The beneficial effects of the technical solution of this invention are: The above-described solution of this invention, by introducing a method for determining the fracture angle based on the internal friction angle, abstracts the complex rock mass failure mode into a clear inverted frustum-shaped failure cone model. It also accurately quantifies the resistance by combining the self-weight stress and tensile strength contribution of the layered rock mass, achieving a scientific characterization of the balance between uplift force and resistance. This effectively solves the dual technical problems of rock mass uplift and sealing failure due to excessively shallow burial depth, and construction costs drastically increased due to excessively deep burial depth. The method provides convenient parameter acquisition and a clear calculation path; the mechanical parameters of each rock layer can be obtained through conventional geotechnical investigation and laboratory tests, avoiding the drawbacks of traditional complex models that rely on computer-aided initial value iteration. This makes it truly suitable for rapid design in engineering practice. Attached Figure Description
[0017] Figure 1This is a flowchart illustrating the method for determining the burial depth of an underground tunnel for compressed air energy storage provided in an embodiment of the present invention.
[0018] Figure 2 This is a schematic diagram of the upward force of high-pressure gas in the overlying rock layer in an embodiment of the present invention.
[0019] Figure 3 This is a schematic diagram of the structure of the strongly weathered rock layer, the moderately weathered rock layer, and the slightly weathered rock layer in the embodiments of the present invention.
[0020] Figure 4 This is a block diagram of the modules of the tunnel-type compressed air energy storage underground chamber burial depth determination system provided in the embodiments of the present invention. Detailed Implementation
[0021] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0022] like Figure 1 As shown, this invention discloses a method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber, comprising: S101, Obtain geotechnical parameters and chamber geometry information; here, geotechnical parameters can be obtained from the geotechnical investigation report, including unit weight of various types of rocks, depth of slightly weathered rock h0, thickness of moderately weathered rock layer h1, thickness of strongly weathered rock layer h2, and internal friction angle of slightly weathered rock layer. and the internal friction angle of moderately weathered rock strata The density of various types of rocks includes: the density of strongly weathered rock strata. Severe weathering of moderately weathered rock strata and heavily weathered rock layers The chamber is generally located in slightly weathered rock strata. The geometric information of the chamber includes: chamber diameter D, chamber length L, and maximum internal pressure P.
[0023] S102, Based on the geometric information of the chamber, determine the high-pressure gas uplift force of the overlying rock strata; S103, Determine the fracture angle of the slightly weathered rock layer based on the internal friction angle of the slightly weathered rock layer; determine the fracture angle of the moderately weathered rock layer based on the internal friction angle of the moderately weathered rock layer. S104, determine the failure cone based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer; S105, based on the failure cone, soil and rock parameter information, and chamber geometry information, determine the self-weight stress of each rock layer failure cone; S106, Determine the tensile strength of the rock layer based on the aforementioned soil and rock parameter information, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer; S107. Determine the burial depth of the chamber based on the tensile strength of the rock strata, the self-weight stress of the failure cone of each rock strata, and the uplift force.
[0024] In this embodiment of the invention, the potential failure mode of the overlying rock mass of the tunnel-type gas storage chamber is abstracted as an inverted frustum-shaped failure cone extending upward along the fracture surface. The dip angle of the fracture surface is uniquely determined by the internal friction angle of each weathered rock layer. Based on this, the vertical upward resultant force of the high-pressure gas acting on the upper half-curved surface of the chamber is accurately determined as the uplift force. The resistance of the overlying rock mass is decomposed into the sum of the self-weight stress of each layer of rock mass within the failure cone and the tensile strength of the rock layer. By comparing the resistance and the uplift force, a stability criterion is established, and an iterative trial algorithm is used to solve for the minimum thickness of the overlying slightly weathered rock layer that meets the safety requirements. A reasonable burial depth range or optimal value is determined that can ensure the long-term safe sealing of the surrounding rock (avoiding the risk of being too shallow) and avoid excessive engineering waste (avoiding excessive depth redundancy). By accurately quantifying the balance between the uplift force and the resistance, the safety problems of surrounding rock uplift and sealing failure caused by excessively shallow burial depth in traditional methods are effectively solved, as well as the economic waste problems of increased construction costs and energy consumption caused by excessive burial depth. Compared with existing complex models, the present invention provides convenient parameter acquisition and a clear calculation path, avoids complex numerical solutions that rely on computer initial value iteration, and achieves manual calculation feasibility.
[0025] In an optional embodiment of the present invention, in S102, determining the high-pressure gas uplift force of the overlying strata based on the chamber geometry information may include: S1021, Based on the chamber diameter D, chamber length L, and maximum internal pressure P, determine the high-pressure gas uplift force of the overlying strata.
[0026] In S1021 of this embodiment, as Figure 2 As shown, the tunnel-type underground chamber is simplified as a horizontally placed cylinder with a diameter of D, a length of L, and a maximum internal pressure of P. The resultant upward force acting on the upper curved surface, i.e., the uplift force, can be calculated using calculus. The axis of the cylinder is taken as the z-axis, and the cross-sectional angle θ is calculated from the vertically upward direction (θ=0 corresponds to the top). The area of the infinitesimal element is... The pressure direction is radially outward, and its vertical component is... The integration range is from arrive Where z ranges from 0 to L, and R is the cross-sectional radius, the formula for calculating the upward force is: ; This method uses the length of the chamber per unit length and the overlying rock mass for calculation, i.e., L=1.
[0027] A compressed air energy storage underground chamber typically comprises, from the inside out: a working gas space, a sealing layer (usually made of steel or organic sealing materials to prevent gas leakage), a lining structure layer (usually a reinforced concrete structure used to confine and protect the working gas space and the sealing layer), and an overlying rock layer. In this embodiment of the invention, the working gas space, sealing layer, and lining structure layer are considered as a whole. The upward force is actually the force exerted by the lining structure layer on the overlying rock layer, which ultimately boils down to the high pressure within the working gas space, simplified as the gas pressure exerted on the overlying rock layer.
[0028] In an optional embodiment of the present invention, in S103, determining the fracture angle of the slightly weathered rock layer based on the internal friction angle of the slightly weathered rock layer may include: S1031, according to Determine the fracture angle of the slightly weathered rock strata, among which, The fracture angle of the slightly weathered rock strata. It represents the friction angle within the slightly weathered rock layer.
[0029] In an optional embodiment of the present invention, in S103, determining the fracture angle of the moderately weathered rock layer based on the internal friction angle of the moderately weathered rock layer may include: S1032, according to Determine the fracture angle of moderately weathered rock strata, among which, The fracture angle of moderately weathered rock strata. This represents the internal friction angle of moderately weathered rock strata.
[0030] In an optional embodiment of the present invention, in S104, determining the failure cone based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer may include: S1041, the width of the top of the slightly weathered layer is determined based on the depth of the slightly weathered rock, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber; S1042, the width of the top of the moderately weathered layer is determined based on the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the depth of the slightly weathered rock layer, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. S1043, Determine the failure cone based on the spread width of the top of the slightly weathered layer and the spread width of the top of the moderately weathered layer.
[0031] In S1041 of this embodiment, based on the slightly weathered rock depth h0 and the slightly weathered rock fracture angle... And the diameter D of the chamber, determine the width a of the top of the slightly weathered layer, and determine the formula: Determine the width 'a' of the top surface of the slightly weathered rock layer along the diameter of the chamber.
[0032] In S1042, based on the thickness h1 of the moderately weathered rock layer and the fracture angle of the moderately weathered rock layer... Depth h0 of slightly weathered rock, fracture angle of slightly weathered rock strata And the diameter D of the chamber, determine the width b of the top of the moderately weathered layer, and determine the formula: D. Based on the distribution width 'a' of the slightly weathered rock layer, determine the distribution width 'b' of the top surface of the moderately weathered rock layer along the diameter direction of the chamber.
[0033] In S1043, the destruction cone is determined based on the spread width of the top of the slightly weathered layer and the spread width of the top of the moderately weathered layer.
[0034] In this embodiment, the cross-section at the top of the chamber serves as the base, extending upwards according to the determined fracture angles in each rock stratum to form an inverted frustum-shaped potential failure body. The cross-section at the top of the chamber is a rectangular area defined by the chamber's length and diameter, and the top surfaces of each rock stratum are successively enlarging rectangular areas, thus forming an inverted frustum-shaped failure cone whose size increases with height. When the uplift force generated by the high-pressure gas inside the chamber exceeds the resistance of the overlying rock mass, failure will begin at the top of the chamber and develop upwards along the fracture surface. Due to the different mechanical properties of each weathered rock stratum, the dip angle of the fracture surface changes as it passes through different rock strata, forming a broken-line fracture surface. The geometry of the failure cone directly determines the volume of the rock mass being moved, thus affecting the magnitude of the self-weight stress. By determining the distribution width of the top surface of each rock stratum in layers, a broken-line failure cone model passing through multiple rock masses is accurately constructed, realistically reflecting the influence of the differences in mechanical parameters of rock strata with different degrees of weathering on the failure morphology. In an optional embodiment of the present invention, in S105, determining the self-weight stress of each rock stratum's failure cone based on the failure cone, soil and rock parameter information, and chamber geometry information may include: S1051, Determine the self-weight stress of the strongly weathered rock layer based on the unit weight of the strongly weathered rock layer, the thickness of the strongly weathered rock layer, and the distribution width of the top of the moderately weathered layer; S1052, Determine the self-weight stress of the moderately weathered rock layer based on the unit weight of the moderately weathered rock layer, the thickness of the moderately weathered rock layer, the width of the top of the slightly weathered layer, and the width of the top of the moderately weathered layer. S1053, the self-weight stress of the slightly weathered rock layer is determined based on the specific gravity of the slightly weathered rock layer, the depth of the slightly weathered rock, the width of the top of the slightly weathered layer, and the diameter of the chamber.
[0035] In S1051 of this embodiment, the length L of the chamber and the unit weight of the strongly weathered rock layer are... Multiply the thickness h2 of the strongly weathered rock layer and the width b of the top of the moderately weathered layer, and calculate the chamber length per unit length, i.e., L=1, to determine the self-weight stress of the strongly weathered rock layer. .
[0036] In S1052, the length L of the chamber (calculated as the length of the chamber per unit length, i.e., L=1) and the unit weight of the moderately weathered rock strata are included. The self-weight stress of the moderately weathered rock layer is determined by multiplying the sum of the thickness h1 of the moderately weathered rock layer, the width a of the top of the slightly weathered layer, and the width b of the top of the moderately weathered layer, and then multiplying by half. .
[0037] In S1053, the length L of the chamber (determined by taking the length of the chamber per unit length, i.e., L=1) and the unit weight of the slightly weathered rock layer are specified. Multiply the sum of the depth h0 of the slightly weathered rock, the width a of the top of the slightly weathered layer, and the diameter D of the chamber, and then multiply by half to determine the self-weight stress of the slightly weathered rock layer. .
[0038] In an optional embodiment of the present invention, in S106, determining the tensile strength of the rock layer based on the soil and rock parameter information, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer may include: S1061, obtain the tensile strength of slightly weathered rock strata, the tensile strength of moderately weathered rock strata and the preset safety reserve factor; S1062, the tensile strength of the rock layer is determined based on the depth of the slightly weathered rock layer, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the fracture angle of the slightly weathered rock layer, the tensile strength of the slightly weathered rock layer, the tensile strength of the moderately weathered rock layer, and the preset safety reserve coefficient.
[0039] In S1061 of this embodiment, the tensile strength of slightly weathered rock strata, the tensile strength of moderately weathered rock strata, and a preset safety reserve coefficient are obtained. Take 0.5 as the tensile strength of slightly weathered rock strata. Tensile strength of moderately weathered rock strata The values were obtained from direct tensile tests or Brazilian splitting tests of the rock mass during the experiment.
[0040] In S1062, based on the chamber length L (determined by taking the chamber length per unit length, i.e., L=1), the slightly weathered rock depth h0, the moderately weathered rock layer thickness h1, and the moderately weathered rock layer fracture angle... Fracture angle of slightly weathered rock layers Tensile strength of slightly weathered rock strata Tensile strength of moderately weathered rock strata With preset safety reserve factor Determine the tensile strength of the rock strata. .
[0041] In an optional embodiment of the present invention, in S107, determining the burial depth of the chamber based on the tensile strength of the rock strata, the self-weight stress of each rock strata failure cone, and the uplift force may include: S1071, the resistance is determined based on the self-weight stress of the strongly weathered rock layer, the self-weight stress of the moderately weathered rock layer, the self-weight stress of the slightly weathered rock layer, and the tensile strength of the rock layer; S1072, If the resistance is less than the uplift force, increase the depth of slightly weathered rock and redetermine it; S1073, if the resistance is greater than the uplift force, and the difference between the resistance and the uplift force accounts for more than 5% of the uplift force, then the depth of slightly weathered rock is reduced and redefined. S1074, when the resistance is not less than the uplift force and the difference between the resistance and the uplift force accounts for no more than 5% of the uplift force, the iteration is terminated and the current slightly weathered rock depth is output. S1075, the burial depth of the chamber is determined based on the thickness of the moderately weathered rock layer, the thickness of the strongly weathered rock layer, and the current depth of the slightly weathered rock.
[0042] In S1071 of this embodiment, the self-weight stress of the strongly weathered rock layer is... Self-weight stress of moderately weathered rock strata Self-weight stress of slightly weathered rock strata and the tensile strength of rock strata Add them together to calculate the resistance, resistance F. k = .
[0043] In S1072, the preset depth h0 of the chamber into the slightly weathered rock is substituted into the tensile strength of the rock strata. In the process, the relationship between the current resistance and the uplift force is compared. If the resistance is less than the uplift force, it indicates that the current preset thickness of the slightly weathered rock layer is insufficient. Therefore, the depth of the slightly weathered rock, h0, is increased and redefined.
[0044] In S1073, if the resistance is greater than the uplift force, and the difference between the two accounts for more than 5% of the uplift force, it indicates that the current slightly weathered rock depth h0 is too large and the safety redundancy is too much. The thickness of the slightly weathered rock layer can be appropriately reduced to optimize the economy. The slightly weathered rock depth h0 should be reduced and redefined.
[0045] In S1074, when the resistance is not less than the uplift force and the difference between the two is no more than five percent of the uplift force, the iteration is terminated. The current slightly weathered rock depth h0 is the minimum safe thickness that meets the requirements of safety and economy. The current slightly weathered rock depth h0 is then output.
[0046] In S1075, the burial depth of the chamber H is determined by the thickness of the moderately weathered rock layer h1, the thickness of the strongly weathered rock layer h2, and the current depth of the slightly weathered rock h0.
[0047] like Figure 3As shown, in one embodiment, a tunnel-type underground chamber is selected, with a chamber length L=1m, a diameter D=15m, and a maximum internal pressure P=17MPa.
[0048] The strata are mainly weathered granite, and the physical and mechanical parameters of each weathered layer are shown in the table below:
[0049] Determine the process (enter all formulas into MathCAD software, assign values to all parameters according to the actual project requirements, and use...) Try the trial-and-error algorithm, input values multiple times, and find the answer. The approximate limit value is 21m). (1) Determine the upward force of high-pressure gas per unit length: F ; (2) Determine the width a of the top of the slightly weathered layer and the width b of the top of the moderately weathered layer: ; ; (3) Determine the self-weight stress of the strongly weathered rock layer Self-weight stress of moderately weathered rock strata and the self-weight stress of slightly weathered rock layers : ; ; ; (4) Determine the tensile strength of the rock strata: ; (5) The resultant force of the tensile strength of the rock strata and the self-weight stress of each rock strata is determined as the resistance force F. k : ; (6) Resistance F k Compared with the lifting force F: F ; The relationship between the two conditions meets the requirements and the difference is less than 5%, therefore 21m is the depth of slightly weathered rock. The approximate limit is that the thickness of the overlying slightly weathered rock layer should be greater than 21m when designing the artificial chamber. The burial depth of the artificial chamber is H = 8.8 + 55 + 21 = 84.6m.
[0050] The implementation principle of the method for determining the burial depth of the underground tunnel-type compressed air energy storage chamber described in the above embodiments of this application is as follows: the potential failure mode of the overlying rock mass of the tunnel-type gas storage chamber is abstracted as an inverted frustum-shaped failure cone extending upward along the fracture surface, and the dip angle of the fracture surface is uniquely determined by the internal friction angle of each weathered rock layer. By accurately determining the vertical upward resultant force of the high-pressure gas acting on the upper half-curved surface of the chamber as the uplift force, the resistance of the overlying rock mass is decomposed into the sum of the self-weight stress of each layer of rock mass within the failure cone and the tensile strength contribution of each layer of rock mass along the failure surface, and a stability criterion for the resistance and uplift force is established. An iterative trial algorithm is used to gradually approximate the minimum thickness of the overlying slightly weathered rock layer that satisfies the requirement that the resistance is not less than the uplift force and the safety redundancy does not exceed five percent, thereby determining the optimal burial depth of the chamber and achieving a scientific unity of gas storage pressure, rock mass mechanical properties, and burial depth design.
[0051] like Figure 4 As shown, this embodiment of the invention also discloses a tunnel-type compressed air energy storage underground chamber burial depth determination system 400, comprising: The acquisition module 401 is used to acquire soil and rock parameter information and chamber geometry information. The soil and rock parameter information includes the unit weight of various types of rocks, the depth of slightly weathered rocks, the thickness of moderately weathered rock layers, the thickness of strongly weathered rock layers, the internal friction angle of moderately weathered rock layers, and the internal friction angle of slightly weathered rock layers. The chamber geometry information includes the chamber diameter, chamber length, and maximum internal pressure. Processing module 402 is used to determine the high-pressure gas uplift force of the overlying rock strata based on the geometric information of the chamber; determine the fracture angle of the slightly weathered rock strata based on the internal friction angle of the slightly weathered rock strata; determine the fracture angle of the moderately weathered rock strata based on the internal friction angle of the moderately weathered rock strata; determine the failure cone based on the depth of the slightly weathered rock strata, the thickness of the moderately weathered rock strata, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; determine the self-weight stress of each rock strata failure cone based on the failure cone, the rock and soil parameter information, and the geometric information of the chamber; determine the tensile strength of the rock strata based on the rock and soil parameter information, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; and determine the burial depth of the chamber based on the tensile strength of the rock strata, the self-weight stress of each rock strata failure cone, and the uplift force.
[0052] Optionally, based on the chamber geometry, the high-pressure gas uplift force of the overlying strata is determined, including: The uplift force of high-pressure gas in the overlying strata is determined based on the chamber diameter, chamber length, and maximum internal pressure.
[0053] Optionally, the fracture angle of the slightly weathered rock layer is determined based on the internal friction angle of the slightly weathered rock layer; the fracture angle of the moderately weathered rock layer is determined based on the internal friction angle of the moderately weathered rock layer, including: according to Determine the fracture angle of the slightly weathered rock strata, among which, The fracture angle of the slightly weathered rock strata. The friction angle within the slightly weathered rock layer; according to Determine the fracture angle of moderately weathered rock strata, among which, The fracture angle of moderately weathered rock strata. This represents the internal friction angle of moderately weathered rock strata.
[0054] Optionally, the failure cone is determined based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer, including: The width of the top of the slightly weathered layer is determined based on the depth of the slightly weathered rock, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The width of the top of the moderately weathered layer is determined based on the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the depth of the slightly weathered rock layer, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The destruction cone is determined based on the spread width of the top of the slightly weathered layer and the spread width of the top of the moderately weathered layer.
[0055] Optionally, based on the failure cone, soil and rock parameter information, and chamber geometry information, the self-weight stress of each rock stratum failure cone is determined, including: The self-weight stress of the strongly weathered rock layer is determined based on the unit weight of the strongly weathered rock layer, the thickness of the strongly weathered rock layer, and the width of the top of the moderately weathered layer. The self-weight stress of the moderately weathered rock layer is determined based on the specific gravity of the moderately weathered rock layer, the thickness of the moderately weathered rock layer, the width of the top of the slightly weathered layer, and the width of the top of the moderately weathered layer. The self-weight stress of the slightly weathered rock layer is determined based on the specific gravity of the slightly weathered rock layer, the depth of the slightly weathered rock, the width of the top of the slightly weathered layer, and the diameter of the chamber.
[0056] Optionally, the tensile strength of the rock strata is determined based on the aforementioned geotechnical parameters, the fracture angle of moderately weathered rock strata, and the fracture angle of slightly weathered rock strata, including: Obtain the tensile strength of slightly weathered rock strata, the tensile strength of moderately weathered rock strata, and the preset safety reserve factor; The tensile strength of the rock layer is determined based on the depth of the slightly weathered rock layer, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the fracture angle of the slightly weathered rock layer, the tensile strength of the slightly weathered rock layer, the tensile strength of the moderately weathered rock layer, and the preset safety reserve coefficient.
[0057] Optionally, the burial depth of the chamber is determined based on the tensile strength of the rock strata, the self-weight stress of the failure cone of each rock stratum, and the uplift force, including: The resistance is determined based on the self-weight stress of the strongly weathered rock layer, the self-weight stress of the moderately weathered rock layer, the self-weight stress of the slightly weathered rock layer, and the tensile strength of the rock layer. If the resistance is less than the uplift force, then increase the depth of the slightly weathered rock and redetermine it; If the resistance is greater than the uplift force, and the difference between the resistance and the uplift force accounts for more than 5% of the uplift force, then the depth of slightly weathered rock should be reduced and redefined. When the resistance is not less than the uplift force, and the difference between the resistance and the uplift force accounts for no more than 5% of the uplift force, the iteration is terminated and the current depth of slightly weathered rock is output. The burial depth of the chamber is determined based on the thickness of the moderately weathered rock layer, the thickness of the strongly weathered rock layer, and the current depth of the slightly weathered rock.
[0058] It should be noted that this system is a device or system corresponding to the above method. All implementation methods in the above method embodiments are applicable to this embodiment and can achieve the same technical effect.
[0059] This invention also discloses a computing device, including: a processor and a memory storing a computer program, wherein the computer program, when executed by the processor, performs the method described above. All implementations in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.
[0060] This invention also discloses a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method described above. All implementations in the above method embodiments are applicable to this embodiment and achieve the same technical effect. Computer-readable storage media include, for example, various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.
Claims
1. A method for determining the burial depth of an underground tunnel-type compressed air energy storage chamber, characterized in that, Includes the following steps: Obtain geotechnical parameters and chamber geometry information. The geotechnical parameters include the unit weight of various types of rocks, the depth of slightly weathered rocks, the thickness of moderately weathered rock layers, the thickness of strongly weathered rock layers, the internal friction angle of moderately weathered rock layers, and the internal friction angle of slightly weathered rock layers. The chamber geometry information includes the chamber diameter, chamber length, and maximum internal pressure. Based on the geometric information of the chamber, the uplift force of the high-pressure gas in the overlying strata is determined; The fracture angle of slightly weathered rock strata is determined based on the internal friction angle of slightly weathered rock strata; the fracture angle of moderately weathered rock strata is determined based on the internal friction angle of moderately weathered rock strata. The failure cone is determined based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer. Based on the failure cone, soil and rock parameter information, and chamber geometry information, the self-weight stress of the failure cone of each rock layer is determined respectively; Based on the aforementioned geotechnical parameters, the fracture angle of moderately weathered rock strata, and the fracture angle of slightly weathered rock strata, the tensile strength of the rock strata is determined. The burial depth of the chamber is determined based on the tensile strength of the rock strata, the self-weight stress of the failure cones of each rock strata, and the uplift force.
2. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 1, characterized in that, Based on the geometry of the chamber, the uplift force of the high-pressure gas in the overlying strata is determined, including: The uplift force of high-pressure gas in the overlying strata is determined based on the chamber diameter, chamber length, and maximum internal pressure.
3. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 1, characterized in that, The fracture angle of slightly weathered rock strata is determined based on the internal friction angle; the fracture angle of moderately weathered rock strata is determined based on the internal friction angle, including: according to Determine the fracture angle of the slightly weathered rock strata, among which, The fracture angle of the slightly weathered rock strata. The friction angle within the slightly weathered rock layer; according to Determine the fracture angle of moderately weathered rock strata, among which, The fracture angle of moderately weathered rock strata. This represents the internal friction angle of moderately weathered rock strata.
4. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 1, characterized in that, Based on the depth of the slightly weathered rock, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, and the fracture angle of the slightly weathered rock layer, the failure cone is determined, including: The width of the top of the slightly weathered layer is determined based on the depth of the slightly weathered rock, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The width of the top of the moderately weathered layer is determined based on the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the depth of the slightly weathered rock layer, the fracture angle of the slightly weathered rock layer, and the diameter of the chamber. The destruction cone is determined based on the spread width of the top of the slightly weathered layer and the spread width of the top of the moderately weathered layer.
5. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 1, characterized in that, Based on the failure cone, soil and rock parameter information, and chamber geometry information, the self-weight stress of the failure cone of each rock stratum is determined, including: The self-weight stress of the strongly weathered rock layer is determined based on the unit weight of the strongly weathered rock layer, the thickness of the strongly weathered rock layer, and the width of the top of the moderately weathered layer. The self-weight stress of the moderately weathered rock layer is determined based on the specific gravity of the moderately weathered rock layer, the thickness of the moderately weathered rock layer, the width of the top of the slightly weathered layer, and the width of the top of the moderately weathered layer. The self-weight stress of the slightly weathered rock layer is determined based on the specific gravity of the slightly weathered rock layer, the depth of the slightly weathered rock, the width of the top of the slightly weathered layer, and the diameter of the chamber.
6. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 5, characterized in that, Based on the aforementioned geotechnical parameters, the fracture angle of moderately weathered rock strata, and the fracture angle of slightly weathered rock strata, the tensile strength of the rock strata is determined, including: Obtain the tensile strength of slightly weathered rock strata, the tensile strength of moderately weathered rock strata, and the preset safety reserve factor; The tensile strength of the rock layer is determined based on the depth of the slightly weathered rock layer, the thickness of the moderately weathered rock layer, the fracture angle of the moderately weathered rock layer, the fracture angle of the slightly weathered rock layer, the tensile strength of the slightly weathered rock layer, the tensile strength of the moderately weathered rock layer, and the preset safety reserve coefficient.
7. The method for determining the burial depth of a tunnel-type compressed air energy storage underground chamber according to claim 6, characterized in that, The burial depth of the chamber is determined based on the tensile strength of the rock strata, the self-weight stress of the failure cones of each rock stratum, and the uplift force, including: The resistance is determined based on the self-weight stress of the strongly weathered rock layer, the self-weight stress of the moderately weathered rock layer, the self-weight stress of the slightly weathered rock layer, and the tensile strength of the rock layer. If the resistance is less than the uplift force, then increase the depth of the slightly weathered rock and redetermine it; If the resistance is greater than the uplift force, and the difference between the resistance and the uplift force accounts for more than 5% of the uplift force, then the depth of slightly weathered rock should be reduced and redefined. When the resistance is not less than the uplift force, and the difference between the resistance and the uplift force accounts for no more than 5% of the uplift force, the iteration is terminated and the current depth of slightly weathered rock is output. The burial depth of the chamber is determined based on the thickness of the moderately weathered rock layer, the thickness of the strongly weathered rock layer, and the current depth of the slightly weathered rock.
8. A system for determining the burial depth of a tunnel-type compressed air energy storage underground chamber, characterized in that, include: The acquisition module is used to acquire soil and rock parameter information and chamber geometry information. The soil and rock parameter information includes the unit weight of various types of rocks, the depth of slightly weathered rocks, the thickness of moderately weathered rock layers, the thickness of strongly weathered rock layers, the internal friction angle of moderately weathered rock layers, and the internal friction angle of slightly weathered rock layers. The chamber geometry information includes the chamber diameter, chamber length, and maximum internal pressure. The processing module is used to determine the high-pressure gas uplift force of the overlying rock strata based on the geometric information of the chamber; determine the fracture angle of the slightly weathered rock strata based on the internal friction angle of the slightly weathered rock strata; determine the fracture angle of the moderately weathered rock strata based on the internal friction angle of the moderately weathered rock strata; determine the failure cone based on the depth of the slightly weathered rock strata, the thickness of the moderately weathered rock strata, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; determine the self-weight stress of each rock strata failure cone based on the failure cone, the rock and soil parameter information, and the geometric information of the chamber; determine the tensile strength of the rock strata based on the rock and soil parameter information, the fracture angle of the moderately weathered rock strata, and the fracture angle of the slightly weathered rock strata; and determine the burial depth of the chamber based on the tensile strength of the rock strata, the self-weight stress of each rock strata failure cone, and the uplift force.
9. A computing device, characterized in that, include: A processor, a memory storing a computer program, wherein the computer program, when executed by the processor, performs the method as described in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that, The system stores instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1 to 7.