Method for evaluating damage of delaminated grouting, storage medium and electronic device

Abstract

The application discloses a kind of delamination grouting damage evaluation method, storage medium and electronic equipment, the method comprises: obtaining the rock sample of each to be measured key layer, and the rock sample is made into corresponding standard test piece;The standard test piece is subjected to physical mechanics experiment, and corresponding physical mechanics parameter is obtained;According to the physical mechanics parameter, grouting numerical simulation model is established;The real-time stress and real-time strain of the to-be-tested key layer are obtained;The real-time stress and the real-time strain are input into the grouting numerical simulation model, and predicted stress and predicted settlement are obtained;According to the real-time stress, the predicted stress, the real-time strain and the predicted settlement, the damage of the to-be-tested key layer is evaluated.The application is implemented, realizes delamination grouting damage evaluation, improves the visualization and safety of black box in the process of coal mining.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for assessing delamination grouting damage, a storage medium, and an electronic device. Background Technology

[0002] Grouting and backfilling in the delamination zone refers to the method of high-pressure grouting into the rock strata in the delamination zone by establishing grouting stations and drilling holes in the goaf. This fills the delamination space between the rock strata, reducing the subsidence rate of the delamination zone and thus minimizing surface subsidence and deformation, which is beneficial for underground mining. However, large-scale coal mining easily leads to environmental problems such as surface subsidence, soil salinization, desertification, and water pollution. Currently, there is a lack of a scientific and systematic approach to assessing damage to critical strata in grouting and backfilling mining. Remedial measures are typically taken only when damage is observed in the critical strata. Therefore, designing a damage assessment method for grouting in the delamination zone is particularly important to address the stability issues in coal mining environments. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies in the process of coal mining with grouting in the delamination zone, which lacks a scientific and complete system for damage assessment of key layers. This invention provides a method, storage medium, and electronic equipment for assessing damage in delamination grouting, thereby realizing damage assessment of delamination grouting and improving the black box visualization and safety of coal mining.

[0004] The present invention provides a method for assessing delamination grouting damage, comprising:

[0005] Obtain rock strata samples for each key layer to be tested, and prepare the rock strata samples into corresponding standard specimens;

[0006] Physical and mechanical experiments were conducted on the standard specimens to obtain the corresponding physical and mechanical parameters;

[0007] A numerical simulation model for grouting is established based on the aforementioned physical and mechanical parameters;

[0008] Obtain the real-time stress and strain of the key layer to be tested;

[0009] The real-time stress and the real-time strain are input into the grouting numerical simulation model to obtain the predicted stress and predicted settlement.

[0010] The damage to the critical layer under test is assessed based on the real-time stress, the predicted stress, the real-time strain, and the predicted settlement.

[0011] In one of the alternative technical solutions, obtaining the real-time stress and real-time strain of the key layer to be tested includes:

[0012] The real-time stress and the real-time strain are obtained by using a stress-strain sensor installed in the key layer to be tested.

[0013] In one of the alternative technical solutions, the process of obtaining the real-time stress and strain of the key layer under test further includes:

[0014] The inner side of the key layer to be tested is divided into an N*Nm grid;

[0015] The stress-strain sensor is positioned at the center of the grid.

[0016] In one alternative technical solution, assessing the damage of the critical layer to be tested based on the real-time stress, the predicted stress, the real-time strain, and the predicted settlement includes:

[0017] The ratio of the real-time stress to the predicted stress is calculated to obtain the stress instability ratio;

[0018] The ratio of the real-time strain to the predicted settlement is calculated to obtain the strain instability ratio;

[0019] The damage to the critical layer under test is assessed based on the stress instability ratio and the strain instability ratio.

[0020] In one of the alternative technical solutions, calculating the ratio of the real-time stress to the predicted stress to obtain the stress instability ratio includes:

[0021] The stress instability ratio is calculated using the following formula:

[0022]

[0023] Wherein, W is the stress instability ratio; S(x) is the real-time stress at one of the monitoring points in the key layer to be measured; S i (x) represents the predicted stress at one of the monitoring points in the key layer to be tested; f is the horizontal length of the mining area;

[0024] The calculation of the ratio of the real-time strain to the predicted settlement to obtain the strain instability ratio includes:

[0025] The strain instability ratio is calculated using the following formula:

[0026]

[0027] Where M is the strain instability ratio; D(x) is the real-time strain at one of the monitoring points in the key layer to be measured; D i (x) represents the predicted settlement of one of the monitoring points in the key layer to be tested.

[0028] In one alternative technical solution, assessing the damage of the critical layer under test based on the stress instability ratio and the strain instability ratio includes:

[0029] The maximum values ​​of the stress instability ratio and the strain instability ratio are calculated to obtain the maximum stress-strain ratio;

[0030] If the maximum stress-strain is less than or equal to the first preset value, the damage to the key layer to be tested is of the first level;

[0031] If the maximum stress-strain is greater than the first preset value and the maximum stress-strain is less than or equal to the second preset value, the damage to the key layer to be tested is of the second level.

[0032] If the maximum stress-strain is greater than the second preset value and the maximum stress-strain is less than or equal to the third preset value, the damage to the key layer to be tested is level three.

[0033] In one alternative technical solution, the step of assessing the damage of the key layer to be tested based on the real-time stress, the predicted stress, the real-time strain, and the predicted settlement further includes:

[0034] If the damage to the key layer to be tested is at the second level, improve the grouting process of the key layer to be tested.

[0035] If the damage to the critical layer under test is at the third level, the critical layer under test shall be reinforced.

[0036] In one of the alternative technical solutions, the first preset value is 0.5, the second preset value is 0.7, and the third preset value is 0.9.

[0037] The present invention also provides a computer-readable storage medium that stores computer instructions, which, when executed by a computer, are used to perform all steps of the delamination grouting damage assessment method described above.

[0038] The present invention also provides an electronic device, comprising:

[0039] At least one processor; and,

[0040] A memory communicatively connected to the at least one processor; wherein,

[0041] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the delamination grouting damage assessment method as described above.

[0042] The above technical solution has the following beneficial effects: by obtaining rock stratum samples of each key layer to be tested and making corresponding standard specimens from the rock stratum samples, conducting physical and mechanical experiments on the standard specimens to obtain the corresponding physical and mechanical parameters, establishing a grouting numerical simulation model based on the physical and mechanical parameters, obtaining the real-time stress and real-time strain of the key layer to be tested, inputting the real-time stress and real-time strain into the grouting numerical simulation model to obtain the predicted stress and predicted settlement, and assessing the damage of the key layer to be tested based on the real-time stress, predicted stress, real-time strain, and predicted settlement, thereby realizing the assessment of delamination grouting damage and improving the black box visualization and safety of coal mining process. Attached Figure Description

[0043] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0044] Figure 1 A flowchart illustrating a method for assessing delamination grouting damage according to an embodiment of the present invention;

[0045] Figure 2 A flowchart illustrating a method for assessing delamination grouting damage according to another embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the hardware structure of an electronic device for assessing delamination grouting damage, provided as an embodiment of the present invention. Detailed Implementation

[0047] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0048] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0049] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0050] like Figure 1 As shown, Figure 1 A flowchart of a method for assessing delamination grouting damage according to an embodiment of the present invention is provided, including:

[0051] Step S101: Obtain rock samples from each key layer to be tested, and prepare the rock samples into corresponding standard specimens;

[0052] Step S102: Conduct physical and mechanical experiments on the standard specimen to obtain the corresponding physical and mechanical parameters;

[0053] Step S103: Establish a numerical simulation model for grouting based on physical and mechanical parameters;

[0054] Step S104: Obtain the real-time stress and strain of the key layer to be tested;

[0055] Step S105: Input the real-time stress and real-time strain into the grouting numerical simulation model to obtain the predicted stress and predicted settlement;

[0056] Step S106: Assess the damage of the key layer to be tested based on real-time stress, predicted stress, real-time strain, and predicted settlement.

[0057] Specifically, step S101 involves acquiring rock samples from each key layer to be tested and preparing corresponding standard specimens using methods such as spark discharge, drilling and milling, or core cutting. Step S102 involves conducting physical and mechanical experiments on the standard specimens, including compression tests, shear tests, and elastic modulus tests, to obtain physical and mechanical parameters corresponding to the standard specimens, including the tensile strength, shear strength, and elastic modulus of the rock. Next, step S103 uses Universal Discrete Element Code (UDEC) software to establish a grouting numerical simulation model based on the physical and mechanical parameters, recording the stress distribution curve and settlement distribution curve at the moment of instability of the underlying key layer. Then, step S104 involves acquiring the real-time stress and strain of the key layer to be tested. Simultaneously, step S105 involves inputting the real-time stress and strain into the grouting numerical simulation model to obtain predicted stress and predicted settlement. Finally, step S106 assesses the damage of the key layer to be tested based on the real-time stress, predicted stress, real-time strain, and predicted settlement.

[0058] In this embodiment, rock samples of each key layer to be tested are obtained, and the rock samples are made into corresponding standard specimens. Physical and mechanical experiments are conducted on the standard specimens to obtain the corresponding physical and mechanical parameters. A grouting numerical simulation model is established based on the physical and mechanical parameters to obtain the real-time stress and real-time strain of the key layer to be tested. The real-time stress and real-time strain are input into the grouting numerical simulation model to obtain the predicted stress and predicted settlement. The damage of the key layer to be tested is evaluated based on the real-time stress, predicted stress, real-time strain and predicted settlement, thereby realizing the assessment of delamination grouting damage and improving the black box visualization and safety of coal mining process.

[0059] In one embodiment, step S104 includes:

[0060] Stress and strain sensors installed in the key layer to be tested are used to obtain real-time stress and strain.

[0061] Specifically, stress and strain sensors are placed inside the key layer to be tested, which facilitates the real-time acquisition of the stress and strain of the key layer.

[0062] In one embodiment, step S104 further includes the following prior to:

[0063] The inner side of the key layer to be tested is divided into an N*Nm grid;

[0064] The stress and strain sensor is placed at the center of the grid.

[0065] Specifically, in physical mechanics experiments, the inner side of the key layer to be tested of the standard specimen is divided into an N*Nm grid, such as a 10*10m grid. The stress and strain sensor is placed at the center of the grid, so that the real-time stress and strain data collected by the stress and strain sensor are more accurate, thereby further improving the accuracy of damage assessment.

[0066] like Figure 2 As shown, Figure 2 A flowchart of a method for assessing delamination grouting damage, provided in another embodiment of the present invention, includes:

[0067] Step S201: Obtain rock samples from each key layer to be tested, and prepare the rock samples into corresponding standard specimens;

[0068] Step S202: Conduct physical and mechanical experiments on the standard specimen to obtain the corresponding physical and mechanical parameters;

[0069] Step S203: Establish a numerical simulation model for grouting based on physical and mechanical parameters;

[0070] Step S204: Obtain the real-time stress and strain of the key layer to be tested;

[0071] Step S205: Input the real-time stress and real-time strain into the grouting numerical simulation model to obtain the predicted stress and predicted settlement;

[0072] Step S206: Calculate the ratio of real-time stress to predicted stress to obtain the stress instability ratio;

[0073] Step S207: Calculate the ratio of real-time strain to predicted settlement to obtain the strain instability ratio;

[0074] Step S208: Calculate the maximum values ​​of the stress instability ratio and the strain instability ratio to obtain the maximum stress and strain;

[0075] Step S209: Determine whether the maximum stress-strain is less than or equal to the first preset value;

[0076] Step S210: The damage to the critical layer to be tested is classified as Level 1;

[0077] Step S211: Determine whether the maximum stress-strain is greater than the first preset value and whether the maximum stress-strain is less than or equal to the second preset value;

[0078] Step S212: The damage to the critical layer to be tested is classified as level two;

[0079] Step S213: Determine whether the maximum stress-strain is greater than the second preset value and whether the maximum stress-strain is less than or equal to the third preset value;

[0080] Step S214: The damage to the critical layer to be tested is level three.

[0081] Specifically, based on the above embodiments, the difference in this embodiment is that the degree of damage to the key layer to be tested is mainly evaluated by performing steps S206-S214.

[0082] First, steps S201-S205 are executed to obtain the predicted stress and predicted settlement. Then, step S206 is executed, which is the ratio of real-time stress to predicted stress. Simultaneously, step S207 is executed, which is the ratio of real-time strain to predicted settlement. Step S208 is executed, where the maximum value between the stress instability ratio and the strain instability ratio is taken as the maximum stress-strain. Next, step S209 is executed to determine if the maximum stress-strain is less than or equal to a first preset value. If so, step S210 is executed to assess the damage of the key layer under test as level one; otherwise, step S211 is executed. Step S211 then determines if the maximum stress-strain is greater than the first preset value and less than or equal to a second preset value. If so, step S212 is executed to assess the damage of the key layer under test as level two; otherwise, step S213 is executed. Step S213 then determines if the maximum stress-strain is greater than the second preset value and less than or equal to a third preset value. If so, step S214 is executed to assess the damage of the key layer under test as level three; otherwise, step S204 is executed.

[0083] The first preset value, the second preset value, and the third preset value can be set according to user needs. The second preset value is greater than the first preset value and less than the third preset value. In this embodiment, the first preset value is preferably 0.5, the second preset value is preferably 0.7, and the third preset value is preferably 0.9.

[0084] In this embodiment, rock samples of each key layer to be tested are obtained, and the rock samples are made into corresponding standard specimens. Physical and mechanical experiments are conducted on the standard specimens to obtain the corresponding physical and mechanical parameters. A grouting numerical simulation model is established based on the physical and mechanical parameters to obtain the real-time stress and real-time strain of the key layer to be tested. The real-time stress and real-time strain are input into the grouting numerical simulation model to obtain the predicted stress and predicted settlement. The ratio of real-time stress to predicted stress is calculated to obtain the stress instability ratio. The ratio of real-time strain to predicted settlement is calculated to obtain the strain instability ratio. The maximum values ​​of the stress instability ratio and the strain instability ratio are calculated to obtain the maximum stress-strain. The maximum stress-strain is compared with the first preset value, the second preset value, or the third preset value to evaluate the damage level of the key layer to be tested, thereby realizing the assessment of delamination grouting damage and improving the black box visualization and safety in the coal mining process.

[0085] In one embodiment, to further improve the accuracy of damage assessment, step S206 includes:

[0086] The stress instability ratio is calculated using the following formula:

[0087]

[0088] Where W is the stress instability ratio; S(x) is the real-time stress at one monitoring point in the key layer to be measured; S i (x) represents the predicted stress at one of the monitoring points in the key layer to be tested; f is the horizontal length of the mining area.

[0089] Step S207 includes:

[0090] The strain instability ratio is calculated using the following formula:

[0091]

[0092] Where M is the strain instability ratio; D(x) is the real-time strain at one monitoring point in the key layer to be measured; D i (x) represents the predicted settlement of one of the monitoring points in the key layer to be measured.

[0093] In one embodiment, step S214 is followed by:

[0094] If the damage to the critical layer to be tested is of the second level, improve the grouting process of the critical layer to be tested.

[0095] If the damage to the critical layer to be tested is classified as level three, the critical layer to be tested shall be reinforced.

[0096] Specifically, if the damage level of the critical layer under test is assessed as Level II, it indicates that the underlying critical layer is not safe enough and the grouting process needs to be improved, including the grouting sequence, grouting method, and grouting volume, to prevent the underlying critical layer from bending and settling and the stress value from developing further, thus posing a safety hazard. If the damage level of the critical layer under test is assessed as Level III, it indicates that the underlying critical layer is unsafe and the critical layer under test needs to be reinforced, including anchor bolt repair, anchor bolt reinforcement, and grouting (excluding the grouting process), to ensure the grouting effect and safety. For example, the support structure of the rock strata can be reinforced and repaired to enhance the stability of the rock strata, thereby achieving the reinforcement treatment of the critical layer under test.

[0097] One embodiment of the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a computer, are used to perform all steps of the delamination grouting damage assessment method as described in any of the above method embodiments.

[0098] like Figure 3 As shown, a schematic diagram of the hardware structure of an electronic device for assessing delamination grouting damage according to an embodiment of the present invention is provided, including:

[0099] At least one processor 301; and,

[0100] Memory 302 is communicatively connected to at least one processor 301; wherein,

[0101] The memory 302 stores instructions that can be executed by at least one processor 301, which enables the at least one processor 301 to perform the delamination grouting damage assessment method as described in any of the above method embodiments.

[0102] Figure 3 Take processor 301 as an example.

[0103] The electronic device is preferably an electronic control unit (ECU).

[0104] The electronic device may also include an input device 303 and an output device 304.

[0105] The processor 301, memory 302, input device 303 and output device 304 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0106] The memory 302, as a non-volatile computer-readable storage medium, can be used to obtain non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the delamination grouting damage assessment method in the embodiments of this application, for example, Figures 1-2The method flow is shown. The processor 301 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules acquired in the memory 302, thereby realizing the delamination grouting damage assessment method in the above embodiments.

[0107] The memory 302 may include an acquisition program area and an acquisition data area, wherein the acquisition program area may acquire an operating system and an application program required for at least one function; the acquisition data area may acquire data created based on the use of the delamination grouting damage assessment method, etc. Furthermore, the memory 302 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 302 may optionally include memory remotely located relative to the processor 301, and these remote memories may be connected via a network to the apparatus performing the delamination grouting damage assessment method. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0108] The input device 303 can receive user clicks and generate signal inputs related to user settings and function control of the delamination grouting damage assessment method. The output device 304 may include a display device such as a screen.

[0109] When the one or more modules are accessed in the memory 302 and are run by the one or more processors 301, the delamination grouting damage assessment method in any of the above method embodiments is executed.

[0110] The above-described product can perform the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for performing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in the embodiments of this application.

[0111] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assessing delamination grouting damage, characterized in that, include: Obtain rock samples from each key layer to be tested, and prepare the rock samples into corresponding standard specimens; Physical and mechanical experiments were conducted on the standard specimens to obtain the corresponding physical and mechanical parameters; A numerical simulation model for grouting is established based on the aforementioned physical and mechanical parameters; Obtain the real-time stress and real-time strain of the key layer to be tested; The real-time stress and the real-time strain are input into the grouting numerical simulation model to obtain the predicted stress and predicted settlement. The damage to the critical layer under test is assessed based on the real-time stress, the predicted stress, the real-time strain, and the predicted settlement. The stress instability ratio is calculated using the following formula: in, The stress instability ratio is mentioned above; The real-time stress at one of the monitoring points in the key layer to be tested; The predicted stress is the stress at one of the monitoring points in the key layer to be tested; The horizontal length of the mining area; The calculation of the ratio of the real-time strain to the predicted settlement to obtain the strain instability ratio includes: The strain instability ratio is calculated using the following formula: in, The strain instability ratio is mentioned above; The real-time strain at one of the monitoring points in the key layer to be tested; The predicted settlement is for one of the monitoring points in the key layer to be measured; The damage to the critical layer under test is assessed based on the stress instability ratio and the strain instability ratio.

2. The method for assessing delamination grouting damage as described in claim 1, characterized in that, The acquisition of real-time stress and real-time strain of the key layer under test includes: The real-time stress and the real-time strain are obtained by using a stress-strain sensor installed in the key layer to be tested.

3. The method for assessing delamination grouting damage as described in claim 2, characterized in that, Prior to obtaining the real-time stress and strain of the key layer under test, the process also includes: The inner side of the key layer to be tested is divided into an N*Nm grid; The stress-strain sensor is positioned at the center of the grid.

4. The method for assessing delamination grouting damage as described in claim 1, characterized in that, The assessment of damage to the critical layer under test based on the stress instability ratio and the strain instability ratio includes: The maximum values ​​of the stress instability ratio and the strain instability ratio are calculated to obtain the maximum stress-strain ratio; If the maximum stress-strain is less than or equal to the first preset value, the damage to the key layer to be tested is of the first level; If the maximum stress-strain is greater than the first preset value and the maximum stress-strain is less than or equal to the second preset value, the damage to the key layer to be tested is of the second level. If the maximum stress-strain is greater than the second preset value and the maximum stress-strain is less than or equal to the third preset value, the damage to the key layer to be tested is level three.

5. The method for assessing delamination grouting damage as described in claim 4, characterized in that, The process of assessing the damage of the critical layer under test based on the real-time stress, the predicted stress, the real-time strain, and the predicted settlement further includes: If the damage to the key layer to be tested is at the second level, improve the grouting process of the key layer to be tested. If the damage to the critical layer under test is at the third level, the critical layer under test shall be reinforced.

6. The method for assessing delamination grouting damage as described in claim 4, characterized in that, The first preset value is 0.5, the second preset value is 0.7, and the third preset value is 0.

9.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a computer, are used to perform all the steps of the delamination grouting damage assessment method as described in any one of claims 1-6.

8. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the delamination grouting damage assessment method as described in any one of claims 1-6.

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