Design method and system for spacing between large underground powerhouse and main transformer room in high ground stress environment

Abstract

The application relates to the technical field of underground engineering design, and discloses a high-ground-stress-environment large underground powerhouse and main transformer room spacing design method and system, which aims to solve the problems of poor reliability and pertinence of the existing method, and mainly comprises the following steps: obtaining the span of a to-be-designed underground powerhouse, the height of the underground powerhouse, the span of a main transformer room, the height of the main transformer room and the rock strength stress ratio of an engineering site; calculating the average span of the underground powerhouse and the main transformer room based on the span of the underground powerhouse and the span of the main transformer room; and substituting the span of the underground powerhouse, the height of the underground powerhouse, the span of the main transformer room, the height of the main transformer room, the rock strength stress ratio and the average span into a preset calculation model to calculate the spacing between the underground powerhouse and the main transformer room. The application improves the accuracy, reliability and pertinence of the underground powerhouse and main transformer room spacing design, and is particularly suitable for high-ground-stress environments.

Description

Technical Field

[0001] This invention relates to the field of underground engineering design technology, specifically to a design method and system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment. Background Technology

[0002] In the layout design of large underground cavern complexes, determining the distance between the underground powerhouse and the main transformer room (i.e., the thickness of the rock column between them) is a core technical challenge concerning both engineering safety and economy. If the distance is too small, the excavation disturbances between the caverns will amplify, creating a cavern complex effect that significantly weakens the stability of the intermediate rock column, increasing support difficulty and the risk of surrounding rock disasters. If the distance is too large, while it may improve stability, it will lengthen the busbar, increasing power loss and project cost. Therefore, finding a scientific, accurate, and reasonable method to determine this distance has significant engineering value.

[0003] Currently, the methods used in engineering practice to determine spacing mainly include the standard method, engineering analogy method, numerical simulation method, and formula method, all of which have certain limitations.

[0004] Although standard methods (such as the "NB / T 35011—2013 Code for Design of Hydropower Station Powerhouses") provide a general rule that the spacing between caverns should not be less than 1.5 times the average span (2.0 times in high ground stress areas), they provide a range of values, which is too general and cannot provide precise quantitative basis for specific projects, thus lacking practicality.

[0005] The engineering analogy method relies on the experience of similar projects that have already been built. However, since the geological conditions and cavern size combinations of each project vary greatly, simple analogies lack universality and scientific validity, and have limited reference value.

[0006] While numerical simulation can perform detailed analysis, its process involves complex modeling, calculation, and result interpretation, resulting in a huge workload, low efficiency, and difficulty in being suitable for rapid comparison and preliminary design of solutions.

[0007] The formula method is considered a promising solution due to its convenience and quantification advantages. Application publication number CN119808379A discloses a design method, system, and storage medium for the spacing between large underground powerhouses and main transformer rooms. This scheme, based on fitting data of the dimensions and spacing of typical large underground powerhouses in China, proposes a calculation formula with L / s as the dependent variable and S·H·h / s³ as the independent variable (where L is the spacing, S and H are the span and height of the powerhouse, and s and h are the span and height of the main transformer room). Although this method represents a significant improvement over the standard method and engineering analogy method, achieving rapid calculation through formulaization, it has inherent flaws in its design principles, leading to insufficient applicability and rationality in high ground stress environments.

[0008] First, the core mechanical mechanism was not grasped in the consideration of the size relationship between the tunnels: a key principle in determining a reasonable spacing lies in assessing the impact of the main transformer chamber excavation on the stability of the surrounding rock of the powerhouse, which essentially depends on the relative size relationship between the main transformer chamber and the powerhouse. The larger the size (span and height) of the main transformer chamber and the closer it is to the size of the powerhouse, the greater the disturbance range caused by its excavation, and the more significant the impact on the stability of the powerhouse sidewalls. Therefore, a larger spacing is needed to reduce this mutual interference. However, the independent variable S·H·h / s³ used in CN119808379A is essentially a combination of the absolute sizes of the powerhouse and the main transformer chamber through multiplication. This modeling approach based on absolute size fails to directly and effectively capture the core factor of the "relative ratio of the two tunnel sizes," and the physical meaning of its variable construction is relatively vague, relying more on statistical fitting, resulting in a lack of theoretical completeness.

[0009] Secondly, there are shortcomings in the handling of high ground stress, a key environmental factor: Under high ground stress conditions, the stress redistribution effect after rock excavation is more severe, and the stability of the surrounding rock is more sensitive to changes in the spacing between tunnels. Therefore, the determination of the spacing must take the ground stress level as an intrinsic core variable. The essence of surrounding rock deformation and failure is the relative relationship between the stress on the rock mass and its strength. Therefore, in engineering, the rock strength-stress ratio (the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress) is often used to comprehensively characterize the ground stress level and its engineering impact. The core calculation formula of CN119808379A does not explicitly include the strength-stress ratio or any ground stress parameters. Although it mentions in subsequent schemes that adjustments can be made according to the ground stress conditions, this is only a post-hoc, qualitative, and empirical correction, and does not organically and quantitatively integrate the high ground stress, a controlling factor, into its core calculation model. This makes it difficult to guarantee the reliability and specificity of the calculation results when facing extreme engineering conditions with extremely high ground stress values ​​or extremely low strength-stress ratios. Summary of the Invention

[0010] This invention aims to solve the problems of poor reliability and specificity in existing design methods for the distance between underground powerhouses and main transformer rooms, and proposes a design method and system for the distance between large underground powerhouses and main transformer rooms in high ground stress environments.

[0011] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0012] In a first aspect, the present invention provides a method for designing the spacing between a large underground powerhouse and a main transformer room in a high-stress environment, the method comprising:

[0013] Obtain the span, height, main transformer room, and rock strength stress ratio of the underground powerhouse to be designed, where the rock strength stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress.

[0014] Based on the span of the underground powerhouse and the span of the main transformer room, the average span of the underground powerhouse and the main transformer room is calculated using the following formula:

[0015] ;

[0016] in, Indicates the average span. Indicates the span of the underground factory building. Indicates the span of the main transformer room;

[0017] Substituting the span and height of the underground powerhouse, the span and height of the main transformer room, the rock strength-stress ratio, and the average span into a preset calculation model, the distance between the underground powerhouse and the main transformer room is calculated. The calculation model is as follows:

[0018] ;

[0019] in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

[0020] Furthermore, the computational model is obtained by fitting it using the following method:

[0021] by As the dependent variable, As independent variables, based on statistical analysis of the design data of dimensions and spacing of existing underground powerhouses and main transformer rooms in high geostress environments, the following results were obtained: and The computational model between them.

[0022] Furthermore, the underground factory building is a large underground factory building with a roof arch span exceeding 25m.

[0023] Furthermore, the high ground stress environment is characterized by the rock strength-stress ratio, and the rock strength-stress ratio corresponding to the high ground stress environment is less than 4.

[0024] Furthermore, the distance between the underground powerhouse and the main transformer room is the horizontal distance between the upper sidewall of the downstream rock anchor beam of the powerhouse and the upstream sidewall of the main transformer room.

[0025] Secondly, the present invention provides a design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment, used to implement the design method for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment described in the first aspect, the system comprising:

[0026] The acquisition unit is used to acquire the span of the underground powerhouse to be designed, the height of the underground powerhouse, the span of the main transformer room, the height of the main transformer room, and the rock strength stress ratio of the engineering site, wherein the rock strength stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress.

[0027] The calculation unit is used to calculate the average span of the underground powerhouse and the main transformer room based on the span of the underground powerhouse and the span of the main transformer room. The calculation formula is as follows:

[0028] ;

[0029] in, Indicates the average span. Indicates the span of the underground factory building. Indicates the span of the main transformer room;

[0030] Substituting the span and height of the underground powerhouse, the span and height of the main transformer room, the rock strength-stress ratio, and the average span into a preset calculation model, the distance between the underground powerhouse and the main transformer room is calculated. The calculation model is as follows:

[0031] ;

[0032] in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

[0033] Furthermore, the system also includes:

[0034] Fitting unit, used to... As the dependent variable, As independent variables, based on statistical analysis of the design data of dimensions and spacing of existing underground powerhouses and main transformer rooms in high geostress environments, the following results were obtained: and The computational model between them.

[0035] Furthermore, the underground factory building is a large underground factory building with a roof arch span exceeding 25m.

[0036] Furthermore, the high ground stress environment is characterized by the rock strength-stress ratio, and the rock strength-stress ratio corresponding to the high ground stress environment is less than 4.

[0037] Furthermore, the distance between the underground powerhouse and the main transformer room is the horizontal distance between the upper sidewall of the downstream rock anchor beam of the powerhouse and the upstream sidewall of the main transformer room.

[0038] The beneficial effects of this invention are as follows: The method and system for designing the spacing between a large underground powerhouse and a main transformer room in a high-stress environment provided by this invention introduces the core mechanical mechanism of the relative size relationship between the powerhouse and the main transformer room into the theoretical model of spacing design. By constructing the independent variable as a comprehensive influencing factor characterizing the relative size relationship between the main transformer room and the underground powerhouse and the level of ground stress, the size ratio of the main transformer room to the powerhouse is directly quantified. When the size of the main transformer room is closer to the size of the powerhouse, its excavation disturbance effect is stronger, and the required safety spacing is also larger. Compared with the existing formula method that only considers the absolute size of the caverns or simple combinations, the calculation model of this invention more accurately reflects the physical essence of the mutual influence of the cavern group in principle, thus enabling a more accurate calculation of the reasonable spacing and improving the scientific nature of the design and the reliability of the results from the theoretical source. At the same time, the rock strength-stress ratio is embedded as the reciprocal form as the core variable in the calculation formula, so that the influence of the key environmental factor of high ground stress on the spacing is quantitatively and modeled into the design process. When the ground stress increases, the formula can automatically calculate a larger spacing value, thereby proactively addressing the surrounding rock stability risk brought about by high ground stress. Furthermore, this invention retains the inherent advantages of efficiency and convenience of the formula method. Designers only need to input easily obtainable or definite parameters such as the span and height of the plant and main transformer room, as well as the rock strength-stress ratio. Through simple algebraic calculations, a precise spacing value can be quickly obtained, rather than a general range. This greatly overcomes the shortcomings of the standard method (ambiguous values) and the cumbersome and time-consuming process of the numerical simulation method. Attached Figure Description

[0039] Figure 1 A flowchart illustrating the design method for the spacing between a large underground powerhouse and the main transformer room in a high ground stress environment, provided for an embodiment.

[0040] Figure 2 A schematic diagram illustrating the positional relationship between the underground powerhouse and the main transformer room, provided for an embodiment.

[0041] Figure 3 A schematic diagram of the fitting of the computational model provided for the embodiment;

[0042] Figure 4The structure of the spacing design system between a large underground powerhouse and a main transformer room in a high ground stress environment is provided for the embodiment. Detailed Implementation

[0043] The current formula-based design for the spacing between underground powerhouses and main transformer rooms essentially combines the absolute dimensions of the powerhouse and main transformer room by multiplying them. This approach fails to directly and effectively reflect the relative size relationship between the two. The core factor determining the degree of mutual influence between chambers is not their absolute dimensions, but their relative proportions. For example, the impact of a large-span main transformer room on a small-span powerhouse is far more significant than its impact on a very large-span powerhouse. The existing calculation model fails to capture this core relationship, resulting in unclear physical meaning of its variable design, a relatively weak theoretical foundation, and affecting its universality and accuracy across various size combinations. Furthermore, the existing scheme excludes high ground stress—an environmental factor that decisively influences surrounding rock stability and spacing selection—from the calculation model. This method of calculating first and then adjusting means the model inherently lacks adaptability to high ground stress environments. When facing extreme engineering conditions with extremely high ground stress values ​​or extremely low rock strength-to-stress ratios, the reliability and specificity of its calculation results are severely insufficient.

[0044] To improve the accuracy, reliability, and relevance of the design of the distance between the underground powerhouse and the main transformer room, especially under complex conditions of high ground stress, the technical solution of this invention is proposed.

[0045] In this invention, the inventors discovered through a series of studies that the key factor determining the degree of mutual influence between two adjacent transformer chambers is not their absolute size, but rather their relative size ratio. If the dimensions (span and height) of the main transformer chamber are closer to the dimensions of the power plant, i.e., the more comparable their scales, the greater the likelihood that the disturbance zone formed by the excavation of the main transformer chamber will spatially overlap and interact with the disturbance zone surrounding the power plant, resulting in a more significant mutual influence. Conversely, if a large power plant is adjacent to a small main transformer chamber, the impact of the main transformer chamber excavation on the stability of the power plant will be relatively limited. To quantify this principle, this invention introduces the span ratio and height ratio of the main transformer chamber to the power plant into the calculation model, using their product as one of the core independent variables. The larger this value, the larger the main transformer chamber is relative to the power plant, and the stronger its relative influence on the stability of the power plant. Therefore, the calculation model needs to increase the spacing to offset this enhanced mutual influence.

[0046] Furthermore, in high-stress environments, the inherent high energy storage state of the rock mass means that any excavation will trigger more intense stress release and redistribution. Based on this, this invention directly incorporates the reciprocal of the rock strength-stress ratio into the calculation formula, quantifying the impact of high stress and internally integrating it into the calculation model. When the project is in a high-stress environment (i.e., when the rock strength-stress ratio is low), the reciprocal of the rock strength-stress ratio increases, and the calculation model will automatically calculate a larger recommended spacing. This proactively provides greater buffer space for surrounding rock deformation in the design, reducing the risk of disaster and avoiding the blindness and uncertainty of retrospective adjustments based on experience in existing technologies.

[0047] Based on the above principles, this invention multiplies the span ratio and height ratio of the main variable chamber to the powerhouse, which characterize the relative dimensions of the caverns, by the reciprocal of the rock strength stress ratio, which characterizes the influence of in-situ stress. These multiplications form the final independent variable, which comprehensively reflects the overall impact of the main variable chamber excavation on the stability of the powerhouse surrounding rock under a specific in-situ stress level. The computational model constructed based on this independent variable can automatically calculate accurate, reliable, and targeted spacing values, thereby improving the stability and safety of the cavern group.

[0048] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0049] Figure 1 A flowchart illustrating a design method for the spacing between a large underground powerhouse and the main transformer room in a high-stress environment is shown. Please refer to [link / reference]. Figure 1 The method includes the following steps:

[0050] Step 1: Obtain the span and height of the underground powerhouse to be designed, the span and height of the main transformer room, and the rock strength stress ratio of the engineering site.

[0051] The rock strength-stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress.

[0052] Please see Figure 2 In practical applications, the first step is to obtain the key input parameters of the project to be designed. These parameters form the basis for subsequent calculations and include:

[0053] Span of underground factory (Unit: m) and height (Unit: m);

[0054] Span of the main transformer room (Unit: m) and height (Unit: m);

[0055] Rock strength stress ratio at the engineering site This parameter was obtained through on-site survey and testing, and the calculation formula is: uniaxial compressive strength of rock / measured maximum principal stress.

[0056] In this embodiment, the underground powerhouse specifically refers to a large underground powerhouse with a roof arch span of [missing information]. Exceeding 25m. The high ground stress environment is characterized by a rock strength-to-stress ratio. Characterization, according to industry standards, when This can be considered as being in a high ground stress environment.

[0057] Step 2: Based on the span of the underground powerhouse and the span of the main transformer room, calculate the average span of the underground powerhouse and the main transformer room.

[0058] The average span is used to normalize the spacing values ​​in subsequent models, making it a dimensionless dependent variable for easier general calculation. The calculation formula is as follows:

[0059] ;

[0060] in, Indicates the average span. Indicates the span of the underground factory building. This indicates the span of the main transformer room.

[0061] Step 3: Substitute the span of the underground powerhouse, the height of the underground powerhouse, the span of the main transformer room, the height of the main transformer room, the rock strength stress ratio, and the average span into the preset calculation model to calculate the distance between the underground powerhouse and the main transformer room.

[0062] The calculation model is as follows:

[0063] ;

[0064] in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

[0065] A comprehensive impact factor is introduced into the above calculation model. This factor simultaneously quantifies the relative dimensions of the main transformer room and the power plant, as well as the ground stress level, in the comprehensive influence factor. In the calculation formula:

[0066] It is the span ratio between the main transformer room and the factory building, reflecting the relative relationship between the two in terms of width;

[0067] It is the height ratio of the main transformer room to the factory building, reflecting the relative height relationship between the two.

[0068] It is the reciprocal of the rock strength-stress ratio. The larger the value, the higher the level of ground stress and the worse the stability of the surrounding rock.

[0069] Comprehensive Impact Factor The larger the spacing, the larger the space of the main transformer room relative to the plant, and the more severe the geostress environment it is in, thus requiring a larger spacing to ensure the stability of the surrounding rock.

[0070] The calculated average span and comprehensive impact factor Substituting these values ​​into the calculation model, the distance between the underground powerhouse and the main transformer room can be obtained. The calculation model is a quadratic polynomial, and its curve relationship can fit engineering reality very well: when When the value is small, the spacing increases. The value is growing rapidly; when After the value increases to a certain extent, the growth of the spacing slows down, which aligns with the consensus in engineering that high ground stress cannot be overcome by indefinitely increasing the spacing. The formula calculates... This refers to the recommended spacing between the underground powerhouse and the main transformer room. This spacing is defined as the horizontal distance between the upper sidewall of the downstream rock anchor beam of the powerhouse and the upstream sidewall of the main transformer room. (See [link to relevant documentation]). Figure 2 .

[0071] In this embodiment, the computational model is obtained by fitting it using the following method: As the dependent variable, As independent variables, based on statistical analysis of the design data of dimensions and spacing of existing underground powerhouses and main transformer rooms in high geostress environments, the following results were obtained: and The computational model between them.

[0072] In practical applications, data from several typical large-scale hydropower station projects with high ground stress in China were collected and compiled, forming the statistical table shown in Table 1. The data should include the span of the powerhouse for each project. ,high Main transformer room span ,high Rock strength stress ratio And the spacing actually used and proven to be safe and reliable. .

[0073] Table 1. Statistical Table of Dimensions and Spacing of Large Underground Powerhouses and Main Transformer Rooms under High Ground Stress

[0074]

[0075] Some explanation of the data in Table 1:

[0076] (1) The selected projects are all typical large underground cavern groups with high ground stress. The measured maximum ground stress values ​​all exceed 25MPa, and a few even exceed 35MPa. Among them, Shuangjiangkou (38MPa) and Yebatan (37.8MPa) are the hydropower underground cavern group projects with the largest measured ground stress values.

[0077] (2) The span and height of the selected underground powerhouse and main transformer room are the main considerations for the subsequent formulas, because the size of the powerhouse and main transformer room has a major influence on the spacing.

[0078] (3) Regarding the consideration of geostress factors, the factor selected in Table 1 and the formula is the strength-stress ratio, which is the ratio of the uniaxial compressive strength of rock to the measured maximum principal stress. The lower the value, the higher the geostress. The standard generally stipulates that when the value is 2 to 4, it is a high geostress environment, and when it is less than 2, it is an extremely high geostress environment. As can be seen from the ratio in Table 1, the above projects are all high geostress underground cavern groups, and the ratios are from low to high, which is representative.

[0079] Please see Figure 3 For each project case in Table 1, calculate its dependent variable. and independent variable Using y as the dependent variable and x as the independent variable, all calculated (x, y) data points are plotted on a coordinate graph (scatter plot). The distribution trend of the scatter points is observed to conform to the characteristics of a quadratic curve. Regression analysis techniques such as least squares are used to perform a quadratic polynomial calculation on the scatter points. Fitting, where a, b, and c are coefficients.

[0080] Finally, through regression analysis, the coefficients a, b, and c with the highest goodness of fit (R² = 0.8529, closest to 1) were obtained. In this invention, the final determined coefficients are: a = -24.213, b = 6.2112, and c = 1.4954. This yields the final calculation model.

[0081] The following example, a proposed high-stress hydropower station, illustrates the specific application of this method.

[0082] 1. Obtain the parameters of the project to be designed:

[0083] Underground factory building: span S=30.1m, height H=60.2m;

[0084] Main transformer room: span s=21.5m, height h=24.2m;

[0085] The rock strength stress ratio r = 2.68 (<4, belonging to a high ground stress environment).

[0086] 2. Calculation process:

[0087] Calculate the average span: =(30.1+21.5) / 2=25.8m;

[0088] Calculate the comprehensive impact factor K: K=(21.5 / 30.1)×(24.2 / 60.2)×(1 / 2.68)≈0.714×0.402×0.373≈0.107;

[0089] Substitute into the calculation model to find :

[0090] =-24.213×(0.107)²+6.2112×0.107+1.4954

[0091] =-24.213×0.01145+0.6646+1.4954

[0092] ≈-0.277+2.160≈1.883;

[0093] Calculate the spacing L: L = 1.883 × =1.883×25.8≈48.6m.

[0094] Based on the calculation method in this embodiment, it is recommended that the distance between the underground powerhouse and the main transformer room of the hydropower station be designed to be 48.6 meters. Simultaneously, the distance can be calculated under different ground stress levels using the same formula. For example, when the rock strength-stress ratio is 2, the calculated distance is 48.7m; when the rock strength-stress ratio is 3, 4, 5, and 6, the distances are 48.2m, 46.9m, 45.7m, and 44.8m, respectively.

[0095] The results above show that the calculated spacing is reasonable. For a high ground stress environment with a strength-stress ratio of 2.68, a spacing of 48.7m corresponds to... The value of 1.88 is consistent with the general value under high ground stress conditions, and the value for existing projects is generally 1.85~1.9. The spacing values ​​under different ground stress levels are also reasonable. When the ground stress is low, the spacing is relatively small, generally around 45m under medium stress conditions, and 46.9~48.7m under high ground stress conditions. Furthermore, as the ground stress continues to increase, the rate of increase in spacing slows down, indicating that under extremely high ground stress, simply increasing the spacing is ineffective; a comprehensive consideration of multiple surrounding rock stability control methods is necessary, which also aligns with practical engineering principles. This verifies the rationality and practicality of this method.

[0096] In summary, the design method for the spacing between large underground powerhouses and main transformer rooms in high-stress environments provided in this embodiment introduces the rock strength-stress ratio as a core variable into the calculation formula, enabling the design model to automatically and quantitatively respond to changes in ground stress. When the ground stress level increases, the model directly calculates a larger safety spacing, fundamentally solving the problem of blind adjustments based on ex-post experience in existing technologies, and significantly improving the design reliability and safety under high and extremely high ground stress conditions. It innovatively employs a comprehensive influencing factor. This invention is the first to incorporate the core mechanical principle of the relative dimensions between the main transformer room and the power plant into the design model. This factor simultaneously captures the relative proportions of the tunnels in terms of span and height, more accurately characterizing the mutual disturbance effects of tunnel group excavation than traditional methods that only consider absolute dimensions. This results in a design with sufficient theoretical basis, clear physical meaning, and greater universality. This embodiment outputs precise spacing values ​​through a defined mathematical formula, rather than a broad empirical range. Designers only need to input a few easily obtainable basic parameters to quickly obtain recommended spacing through simple calculations. This greatly overcomes the shortcomings of cumbersome numerical simulation methods and vague values ​​in standard methods, making it particularly suitable for rapid comparison and optimization in the early stages of scheme selection. It has strong engineering practicality and is easy to promote.

[0097] Based on the above technical solution, this embodiment also proposes a design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment, used to implement the design method for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment described in the embodiment. Please refer to [link to relevant documentation]. Figure 4 The system includes:

[0098] The acquisition unit is used to acquire the span of the underground powerhouse to be designed, the height of the underground powerhouse, the span of the main transformer room, the height of the main transformer room, and the rock strength stress ratio of the engineering site, wherein the rock strength stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress.

[0099] The calculation unit is used to calculate the average span of the underground powerhouse and the main transformer room based on the span of the underground powerhouse and the span of the main transformer room. The calculation formula is as follows:

[0100] ;

[0101] in, Indicates the average span. Indicates the span of the underground factory building. Indicates the span of the main transformer room;

[0102] Substituting the span and height of the underground powerhouse, the span and height of the main transformer room, the rock strength-stress ratio, and the average span into a preset calculation model, the distance between the underground powerhouse and the main transformer room is calculated. The calculation model is as follows:

[0103] ;

[0104] in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

[0105] It is understood that the high-stress environment large underground powerhouse and main transformer room spacing design system described in this embodiment is a system used to implement the high-stress environment large underground powerhouse and main transformer room spacing design method described in the embodiment. As for the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant parts, please refer to the description of the method. It will not be repeated here.

Claims

1. A design method for the distance between a large underground powerhouse and a main transformer room in a high-stress environment, characterized in that, The method includes: Obtain the span, height, main transformer room, and rock strength stress ratio of the underground powerhouse to be designed, where the rock strength stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress. Based on the span of the underground powerhouse and the span of the main transformer room, the average span of the underground powerhouse and the main transformer room is calculated using the following formula: ； in, Indicates the average span. Indicates the span of the underground factory building. Indicates the span of the main transformer room; Substituting the span and height of the underground powerhouse, the span and height of the main transformer room, the rock strength-stress ratio, and the average span into a preset calculation model, the distance between the underground powerhouse and the main transformer room is calculated. The calculation model is as follows: ； in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

2. The design method for the distance between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 1, characterized in that, The computational model was obtained by fitting it using the following method: by As the dependent variable, As independent variables, based on statistical analysis of the design data of dimensions and spacing of existing underground powerhouses and main transformer rooms in high geostress environments, the following results were obtained: and The computational model between them.

3. The design method for the distance between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 1, characterized in that, The underground powerhouse is a large underground powerhouse with a roof arch span exceeding 25m.

4. The design method for the distance between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 1, characterized in that, The high ground stress environment is characterized by the rock strength-stress ratio, and the rock strength-stress ratio corresponding to the high ground stress environment is less than 4.

5. The design method for the distance between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 1, characterized in that, The distance between the underground powerhouse and the main transformer room is the horizontal distance between the upper sidewall of the rock anchor beam on the downstream side of the powerhouse and the upper sidewall of the main transformer room.

6. A design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment, characterized in that: The system is used to implement the design method for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment as described in any one of claims 1 to 5, the system comprising: The acquisition unit is used to acquire the span of the underground powerhouse to be designed, the height of the underground powerhouse, the span of the main transformer room, the height of the main transformer room, and the rock strength stress ratio of the engineering site, wherein the rock strength stress ratio is the ratio of the uniaxial compressive strength of the rock to the measured maximum principal stress. The calculation unit is used to calculate the average span of the underground powerhouse and the main transformer room based on the span of the underground powerhouse and the span of the main transformer room. The calculation formula is as follows: ； in, Indicates the average span. Indicates the span of the underground factory building. Indicates the span of the main transformer room; Substituting the span and height of the underground powerhouse, the span and height of the main transformer room, the rock strength-stress ratio, and the average span into a preset calculation model, the distance between the underground powerhouse and the main transformer room is calculated. The calculation model is as follows: ； in, , To characterize the comprehensive influencing factors of the relative dimensions of the main transformer room and the underground powerhouse, as well as the level of ground stress, This indicates the distance between the underground powerhouse and the main transformer room. Indicates the height of the underground factory building. Indicates the height of the main transformer room. This indicates the rock strength-stress ratio.

7. The design system for the spacing between a large underground powerhouse and main transformer room in a high-stress environment as described in claim 6, characterized in that, The system also includes: Fitting unit, used to... As the dependent variable, As independent variables, based on statistical analysis of the design data of dimensions and spacing of existing underground powerhouses and main transformer rooms in high geostress environments, the following results were obtained: and The computational model between them.

8. The design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 6, characterized in that, The underground powerhouse is a large underground powerhouse with a roof arch span exceeding 25m.

9. The design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 6, characterized in that, The high ground stress environment is characterized by the rock strength-stress ratio, and the rock strength-stress ratio corresponding to the high ground stress environment is less than 4.

10. The design system for the spacing between a large underground powerhouse and a main transformer room in a high-stress environment according to claim 6, characterized in that, The distance between the underground powerhouse and the main transformer room is the horizontal distance between the upper sidewall of the rock anchor beam on the downstream side of the powerhouse and the upper sidewall of the main transformer room.

Images