Method for evaluating rock mass integrity of underground powerhouse of pumped storage power station and electronic equipment

Abstract

The invention belongs to the technical field of pumped storage power stations, and provides a pumped storage power station underground powerhouse rock mass integrity evaluation method and a storage medium, the pumped storage power station underground powerhouse rock mass integrity evaluation method comprises the following steps: obtaining a lithologic fresh rock mass seismic longitudinal wave velocity corresponding to a to-be-tested underground powerhouse; predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass; acquiring natural source surface wave signals of earth surfaces corresponding to rock masses with different integrity degrees of the underground powerhouse part to be detected; processing the natural source surface wave signal to obtain the apparent shear wave velocity of rock masses with different completeness degrees at the underground powerhouse part; calculating an integrity coefficient according to the apparent shear wave velocities of the rock masses with different integrity degrees and the seismic shear wave velocities of the fresh rock masses; and evaluating the integrity of the rock mass of the underground powerhouse according to the integrity coefficient. According to the method, the integrity degree of the rock mass can be evaluated more visually and effectively through the integrity coefficient, and data support can be provided for follow-up engineering site selection and scheme making.

Description

Technical Field

[0001] The invention belongs to the technical field of pumped storage power stations, and in particular relates to an evaluation method and electronic equipment for rock mass integrity of underground powerhouses of pumped storage power stations. Background Art

[0002] Pumped-storage power stations are generally used for peak load regulation, frequency regulation, phase regulation, and emergency backup. Pumped-storage power stations are often constructed as clusters of underground powerhouses and caverns. These structures present complex geological conditions, long construction sites, and numerous safety hazards in caverns, high slopes, and deep foundation pits. Construction processes such as cavern blasting, slope support, and foundation pit excavation all carry safety risks.

[0003] In the field of pumped-storage power station surveys, underground powerhouse site selection is a key and challenging aspect of the survey. The integrity of the rock mass in the area surrounding the underground powerhouse directly impacts the project's difficulty and investment. Underground powerhouses in pumped-storage power stations typically measure 200 to 300 meters horizontally, 100 to 200 meters wide, and 50 to 100 meters vertically, with a burial depth typically exceeding 300 meters. Conventional methods for assessing the rock mass integrity in this area primarily rely on drilling and adits. However, these methods are expensive and rely on point-to-line exploration, failing to fully cover the underground powerhouse area in three dimensions. Geophysical methods, particularly electromagnetic and elastic wave methods, are also commonly used in pumped-storage power station site selection surveys due to their deep detection depth, economical cost, and safety. However, electromagnetic methods suffer from lower vertical resolution and are significantly affected by groundwater, in addition to rock mass integrity, as factors influencing resistivity. In contrast, elastic wave velocity is highly correlated with rock mass quality, and shear wave velocity is unaffected by groundwater. Summary of the Invention

[0004] In view of this, the present invention provides a method for evaluating the integrity of the rock mass of the underground powerhouse of a pumped-storage power station, so as to solve the problem in the prior art that the integrity of the rock mass of the underground powerhouse of a pumped-storage power station cannot be effectively evaluated.

[0005] In a first aspect, the present invention provides a method for evaluating the integrity of rock masses in underground powerhouses of pumped-storage power stations, comprising: obtaining the seismic longitudinal wave velocity of fresh rock masses corresponding to the rock type at a location in the underground powerhouse to be tested; predicting the seismic shear wave velocity of fresh rock masses based on the seismic longitudinal wave velocity of the fresh rock masses; obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the location in the underground powerhouse to be tested; processing the natural source surface wave signals to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the location in the underground powerhouse to be tested; calculating an integrity coefficient based on the apparent shear wave velocities of rock masses with different degrees of integrity and the seismic shear wave velocity of the fresh rock masses; and evaluating the integrity of the rock mass at the location in the underground powerhouse to be tested based on the integrity coefficient.

[0006] In some embodiments, obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse location to be tested specifically includes: obtaining the acoustic longitudinal wave velocity of fresh rock mass in the borehole of the underground powerhouse location to be tested; and calculating the seismic longitudinal wave velocity of the fresh rock mass based on the acoustic longitudinal wave velocity of the fresh rock mass in the borehole. The specific formula is as follows: V pr =V ps / k; where V ps is the acoustic longitudinal wave velocity of fresh rock mass in the borehole, V pr is the seismic longitudinal wave velocity of fresh rock mass, k = 1.05 ~ 1.25, determined based on engineering experience.

[0007] In some embodiments, the average value of the acoustic wave velocity of the section with the highest wave velocity value and continuous and stable distribution within the test range of the underground powerhouse to be tested is obtained as the acoustic wave longitudinal wave velocity of the fresh rock mass in the borehole.

[0008] In some embodiments, the calculation formula for the seismic shear wave velocity of the fresh rock mass is as follows: Among them, μ d is the dynamic Poisson's ratio, V sr is the seismic shear wave velocity of fresh rock mass.

[0009] In some embodiments, the integrity coefficient is calculated as follows: Among them, V s is the apparent shear wave velocity of rock masses with different degrees of integrity, K v is the integrity factor.

[0010] In a second aspect, the present invention also provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can: obtain the seismic longitudinal wave velocity of fresh rock mass corresponding to the rock type of the underground powerhouse to be tested; predict the seismic shear wave velocity of fresh rock mass based on the seismic longitudinal wave velocity of the fresh rock mass; obtain natural source surface wave signals corresponding to the surface of rock mass with different degrees of integrity at the underground powerhouse to be tested; process the natural source surface wave signals to obtain apparent shear wave velocities of rock mass with different degrees of integrity at the underground powerhouse to be tested; calculate the integrity coefficient based on the apparent shear wave velocities of rock mass with different degrees of integrity and the seismic shear wave velocity of the fresh rock mass; and evaluate the integrity of the rock mass at the underground powerhouse to be tested based on the integrity coefficient.

[0011] In a third aspect, the present invention provides a storage medium storing a computer program, which, when executed by a processor, implements any one of the methods for evaluating the rock integrity of an underground powerhouse of a pumped-storage power station.

[0012] The beneficial effects of the present invention are as follows: the present invention can more intuitively and effectively evaluate the integrity of the rock mass through the integrity coefficient, and can provide data support for subsequent project site selection and plan formulation, so that a suitable underground powerhouse location can be selected, the difficulty of the project can be reduced, and the investment funds can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0014] Figure 1 This is a flow chart of a method for evaluating the rock mass integrity of an underground powerhouse in a pumped storage power station according to an embodiment of the present invention;

[0015] Figure 2 This is a distribution diagram of integrity coefficients of a method for evaluating rock mass integrity of an underground powerhouse in a pumped-storage power station according to an embodiment of the present invention;

[0016] Figure 3 FIG. 1 is a block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] The following combination Figures 1 to 3 , describing embodiments of the present invention.

[0022] like Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a method for evaluating the rock mass integrity of an underground powerhouse of a pumped storage power station is provided, comprising the following steps:

[0023] Step S101: obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse to be tested.

[0024] Step S102: predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass.

[0025] Step S103: obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the underground powerhouse to be tested.

[0026] Step S104: Processing the natural source surface wave signal to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the underground powerhouse location to be measured.

[0027] Step S105: Calculate the integrity coefficient based on the apparent shear wave velocity of rock masses with different integrity levels and the seismic shear wave velocity of fresh rock masses.

[0028] Step S106: Evaluate the integrity of the rock mass at the underground powerhouse site to be tested based on the integrity coefficient.

[0029] In this embodiment, the frequency of the seismic wave test is low and the measurement section is large, which can reflect the comprehensive wave velocity of the rock mass and the structural surface. A micro-seismic measurement line is arranged in the underground powerhouse, and a micro-seismic instrument is used to collect natural source surface wave signals. The natural source surface wave signals are then processed to obtain the apparent shear wave velocity of the rock mass with different degrees of integrity in the underground powerhouse area. The integrity coefficient of the rock mass is calculated by the seismic shear wave velocity of the fresh rock mass and the apparent shear wave velocity of the rock mass with different degrees of integrity in the underground powerhouse area, and the integrity of the rock mass in the underground powerhouse area is evaluated. The integrity coefficient can more intuitively evaluate the integrity of the rock mass, thereby providing data support for subsequent project site selection and program formulation. The method provided by the present invention can obtain the integrity coefficient that completely covers the three-dimensional space of the underground powerhouse area. It is not only suitable for the integrity detection of the rock mass of the pumped storage underground powerhouse, but also for the integrity detection of other deep-buried rock masses. It has the advantages of wide application range, economy, and safety.

[0030] Based on step S101, obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse to be tested specifically includes:

[0031] Step S1011: Obtain the acoustic longitudinal wave velocity of fresh rock mass in the borehole at the underground powerhouse location to be measured.

[0032] Step S1012: Calculate the seismic longitudinal wave velocity of the fresh rock mass according to the longitudinal wave velocity of the fresh rock mass in the borehole. The specific formula is as follows:

[0033] V pr =V ps / k.

[0034] Among them, V ps is the acoustic longitudinal wave velocity of fresh rock mass in the borehole, V pr is the seismic longitudinal wave velocity of fresh rock mass, k = 1.05 ~ 1.25, determined based on engineering experience.

[0035] Measure the acoustic wave velocity of the borehole at the underground powerhouse location and obtain the acoustic longitudinal wave velocity of the fresh rock mass in the borehole, which is recorded as V ps .

[0036] Calculate the seismic longitudinal wave velocity V of fresh rock mass according to the following formula pr .

[0037] V pr =V ps / k;

[0038] Among them, k = 1.05 ~ 1.25, determined based on engineering experience.

[0039] This is primarily because acoustic wave testing uses a small transmission / reception interval and high frequency, primarily reflecting rock velocity within a 0.3m radius around the borehole, which is closer to rock mass velocity. Seismic wave testing, on the other hand, uses a lower frequency and a larger measurement interval, reflecting the combined wave velocity of the rock mass and structural surfaces. Therefore, the two have a multiple relationship. Generally, the greater the acoustic wave velocity of fresh rock, the smaller this value.

[0040] Furthermore, the average value of the acoustic wave velocity of the section with the highest wave velocity value and continuous and stable distribution within the test range of the underground powerhouse to be tested is obtained as the acoustic wave longitudinal wave velocity of the fresh rock mass in the borehole.

[0041] The calculation formula for the seismic shear wave velocity of fresh rock mass is as follows:

[0042]

[0043] Among them, μ d is the dynamic Poisson's ratio, V sr is the seismic shear wave velocity of fresh rock mass.

[0044] According to the following formula, the seismic longitudinal wave velocity V of the fresh rock mass in the underground powerhouse area is used. pr Prediction of seismic shear wave velocity V in fresh rock mass sr .

[0045]

[0046] Among them, μ d The values ​​are shown in the following table.

[0047]

[0048] For example, the longitudinal acoustic wave velocity of the rock mass in the section from 120.3m to 648.9m of the borehole on the axis of the main powerhouse is measured, with a range of 3190m / s to 6760m / s. The average acoustic wave velocity of the section with the highest and continuously stable wave velocity within the test range is taken as the longitudinal acoustic wave velocity of the fresh rock mass of the bioclastic limestone block, V ps The value is 6600m / s. In principle, the test range should not be less than 1m, and the wave velocity range should be less than 5%.

[0049] According to V pr =V ps / k, calculate the seismic longitudinal wave velocity V of fresh rock mass pr , take k = 1.05, then V pr =6290m / s.

[0050] Furthermore, the calculation formula of the integrity coefficient is as follows:

[0051]

[0052] Among them, Vs is the apparent shear wave velocity of rock masses with different degrees of integrity, K v is the integrity factor.

[0053] According to the corresponding relationship between the integrity coefficient and the rock mass integrity specified in the Code for Geological Investigation of Hydropower Engineering GB50287, when K v >0.75, the integrity of the rock mass is complete, when 0.75≥K v >0.55, the rock mass is relatively complete. v >0.35, the integrity of the rock mass is poor. When 0.35≥K v >0.15, the integrity of the rock mass is relatively broken. v ≤0.15, the integrity of the rock mass is broken.

[0054] like Figure 2 As shown, the black rectangle is the location of the underground powerhouse of the pumped storage power station. It can be seen that the integrity of the rock mass at the location of the underground powerhouse is mainly complete, relatively complete, and poor integrity, which meets the site selection requirements for the underground powerhouse.

[0055] like Figure 3 As shown, the present invention further provides an electronic device, comprising: at least one processor 110; a memory 120 communicatively connected to the at least one processor; wherein the memory 120 stores instructions executable by the at least one processor 110, and the instructions are executed by the at least one processor 110 to enable the at least one processor 110 to implement the following steps:

[0056] Step S101: obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse to be tested.

[0057] Step S102: predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass.

[0058] Step S103: obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the underground powerhouse to be tested.

[0059] Step S104: Processing the natural source surface wave signal to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the underground powerhouse location to be measured.

[0060] Step S105: Calculate the integrity coefficient based on the apparent shear wave velocity of rock masses with different integrity levels and the seismic shear wave velocity of fresh rock masses.

[0061] Step S106: Evaluate the integrity of the rock mass at the underground powerhouse site to be tested based on the integrity coefficient.

[0062] Electronic equipment is intended to refer to various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers.

[0063] Electronic devices may also refer to various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or claimed herein.

[0064] The present invention proposes a method and system for evaluating the integrity of the rock mass of an underground powerhouse in a pumped-storage power station. This method utilizes the measured shear wave velocity and combines the correspondence between the integrity coefficient and the degree of rock mass integrity specified in the "Code for Geological Investigation of Hydropower Engineering" (GB50287) to effectively evaluate the integrity of the rock mass of the underground powerhouse.

[0065] The present invention further provides a storage medium storing a computer program. When the computer program is executed by a processor, the steps of the method for evaluating the rock mass integrity of an underground powerhouse of a pumped storage power station are as follows:

[0066] Step S101: obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse to be tested.

[0067] Step S102: predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass.

[0068] Step S103: obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the underground powerhouse to be tested.

[0069] Step S104: Processing the natural source surface wave signal to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the underground powerhouse location to be measured.

[0070] Step S105: Calculate the integrity coefficient based on the apparent shear wave velocity of rock masses with different integrity levels and the seismic shear wave velocity of fresh rock masses.

[0071] Step S106: Evaluate the integrity of the rock mass at the underground powerhouse site to be tested based on the integrity coefficient.

[0072] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0073] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.

[0074] Alternatively, the computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media would include electrical connections based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fibers, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0075] Obviously, the above embodiments are merely examples for clear description and are not intended to limit the implementation methods.

[0076] Those skilled in the art will readily appreciate that other variations or modifications may be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for evaluating the rock mass integrity of an underground powerhouse of a pumped storage power station, characterized in that: include: Obtain the seismic longitudinal wave velocity of the fresh rock mass corresponding to the lithology of the underground powerhouse to be tested; Predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass; Obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the location of the underground powerhouse to be tested; Processing the natural source surface wave signal to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the underground powerhouse to be tested; Calculating the integrity coefficient according to the apparent shear wave velocity of the rock mass with different integrity levels and the seismic shear wave velocity of the fresh rock mass; The integrity of the rock mass at the underground powerhouse location to be tested is evaluated according to the integrity coefficient.

2. The method for evaluating the rock mass integrity of an underground powerhouse of a pumped storage power station according to claim 1, characterized in that: Obtaining the seismic longitudinal wave velocity of fresh rock mass corresponding to the lithology of the underground powerhouse to be tested, specifically includes: Obtaining the acoustic longitudinal wave velocity of fresh rock mass in the borehole at the underground powerhouse to be tested; The seismic longitudinal wave velocity of the fresh rock mass is calculated according to the acoustic longitudinal wave velocity of the fresh rock mass in the borehole, and the specific formula is as follows: V pr =V ps / k; Among them, V ps is the acoustic longitudinal wave velocity of fresh rock mass in the borehole, V pr is the seismic longitudinal wave velocity of fresh rock mass, k=1.05~1.25, determined based on engineering experience.

3. The method for evaluating rock mass integrity of underground powerhouse of a pumped storage power station according to claim 2, characterized in that: The average value of the acoustic wave velocity of the section with the highest wave velocity value and continuous and stable distribution within the test range of the underground powerhouse to be tested is obtained as the acoustic wave longitudinal wave velocity of the fresh rock mass in the borehole.

4. The method for evaluating the rock mass integrity of an underground powerhouse of a pumped storage power station according to claim 2, characterized in that: The calculation formula of the seismic shear wave velocity of the fresh rock mass is as follows: Among them, μ d is the dynamic Poisson's ratio, V sr is the seismic shear wave velocity of fresh rock mass.

5. The method for evaluating rock mass integrity of underground powerhouse of a pumped storage power station according to claim 4, characterized in that: The calculation formula of the integrity coefficient is as follows: Among them, V s is the apparent shear wave velocity of rock masses with different integrity levels, K v is the integrity factor.

6. An electronic device, characterized in that: include: at least one processor (110); a memory (120) communicatively coupled to the at least one processor (110); The memory (120) stores instructions executable by the at least one processor (110), and the instructions are executed by the at least one processor (110) to enable the at least one processor (110) to: Obtain the seismic longitudinal wave velocity of the fresh rock mass corresponding to the lithology of the underground powerhouse to be tested; Predicting the seismic shear wave velocity of the fresh rock mass according to the seismic longitudinal wave velocity of the fresh rock mass; Obtaining natural source surface wave signals corresponding to the surface of rock masses with different degrees of integrity at the location of the underground powerhouse to be tested; Processing the natural source surface wave signal to obtain apparent shear wave velocities of rock masses with different degrees of integrity at the underground powerhouse to be tested; Calculating the integrity coefficient according to the apparent shear wave velocity of the rock mass with different integrity levels and the seismic shear wave velocity of the fresh rock mass; The integrity of the rock mass at the underground powerhouse location to be tested is evaluated according to the integrity coefficient.

7. A storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the method for evaluating the rock mass integrity of an underground powerhouse of a pumped-storage power station as claimed in any one of claims 1 to 8 is implemented.

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