A rapid assessment method for time-delay rockburst risk in open TBM tunnels

Abstract

The present invention provides a method for rapidly assessing the time-lag rockburst risk of an open TBM tunnel. The method comprises the following specific steps: recording the location of an immediate high-stress failure zone occurring in an excavated tunnel section and determining the range of a time-lag rockburst risk assessment unit; obtaining TBM parameters within the time-lag rockburst risk assessment unit; dividing the risk assessment unit that meets the TBM parameter change characteristic conditions into a time-lag rockburst risk zone; obtaining advanced geological prediction results of an unexcavated area and analyzing whether a special geological structure zone exists; obtaining data of an excavated area and analyzing the control effect of a support method on rockburst; obtaining the probability of occurrence of a time-lag rockburst under different conditions and a table of the probability of occurrence of a time-lag rockburst under different conditions based on the influence relationship between the special geological structure zone and the support method of similar projects on the time-lag rockburst; substituting the analysis results of the support method and the special geological structure zone in the time-lag rockburst risk zone into the table of the probability of occurrence of a time-lag rockburst, and obtaining the probability of occurrence of a time-lag rockburst in the time-lag rockburst risk zone.

Description

Technical Field

[0001] The present invention relates to the technical field of rockburst risk assessment, and in particular to a method for rapid assessment of time-delay rockburst risk in an open TBM tunnel. Background Art

[0002] Time-lag rockbursts occur after stress equilibrium is achieved following excavation unloading and are triggered by external disturbances. These rockbursts exhibit a spatial or temporal lag. Due to the structural limitations of the TBM itself, failure to identify the time-lag rockburst risk zone in the initial stages of surrounding rock exposure behind the shield makes it difficult to address the area later. This poses significant challenges to engineering construction and disaster prevention. Therefore, timely and efficient risk assessment methods for time-lag rockbursts are crucial.

[0003] Invention patent CN115165629A discloses a method for assessing rockburst propensity. This method calculates the energy ratio for assessing potential rockburst types based on the residual elastic energy and critical rockburst ejection energy of the rock sample obtained experimentally. The rockburst propensity is then determined based on the value of this ratio. When ω ≥ 1, the rockburst is considered to have an immediate rockburst tendency; when ω < 1, the rockburst is considered to have a time-delayed rockburst tendency or no rockburst tendency. This method assesses the rock's propensity for a time-delayed rockburst from an energy perspective, ignoring the effect of rock mass structure on time-delayed rockbursts.

[0004] Patent CN110568477A discloses a spatiotemporal early warning method for time-lag rockbursts during tunnel construction. This method involves placing microseismic sensors in the tunnel and connecting them to a microseismic monitoring system. The captured microseismic events are then located to determine the pile number range and location corresponding to the rockburst risk area. Stress sensors are then deployed within the rockburst risk area. Ultimately, microseismic parameters and stress evolution curves for the rockburst risk area are obtained, allowing analysis and determination of the rockburst's location and time. While this invention can provide precise early warning of the rockburst's location and time, many tunnel projects with time-lag rockburst risks still lack timely microseismic monitoring, making this method difficult to directly apply.

[0005] Patent CN116088033A discloses a method for identifying time-delayed, extremely severe rockbursts. Based on initial geostress test results and the physical and mechanical parameters of rock and structural surfaces obtained from on-site geological surveys, a three-dimensional numerical model is established. Numerical calculations are performed by simulating tunnel excavation under different structural surface combinations to determine the risk of a time-delayed, extremely severe rockburst after excavation at the current tunnel location. This method considers the impact of structural surfaces and their combinations on time-delayed rockbursts, but the required physical and mechanical parameters are difficult to obtain directly.

[0006] In summary, a rapid assessment method for time-lag rockburst risk in open TBM tunnels based on multi-source information directly available on site has not yet been established for time-lag rockburst risk assessment. Summary of the Invention

[0007] In response to the technical issues raised above, a method for rapid assessment of time-delay rockburst risk in an open TBM tunnel is provided.

[0008] The technical means adopted in the present invention are as follows:

[0009] A rapid assessment method for time-delay rockburst risk in an open TBM tunnel, comprising the following steps:

[0010] S1. Record the distribution of immediate high-stress failure zones in the excavated tunnel section and determine the scope of the time-lag rockburst risk assessment unit.

[0011] S2. Obtain and organize TBM parameters in the time-lag rockburst risk assessment unit;

[0012] S3. Divide the risk assessment units that meet the TBM parameter change characteristic conditions into time-lag rockburst risk areas;

[0013] S4. Obtain a topographic map of the tunnel site, tunnel geological data, and advanced geological prediction results for the unexcavated area, and analyze whether there is a special geological structure within three times the tunnel diameter in the time-lag rockburst risk zone;

[0014] S5. Obtain support data for the excavated area and analyze the rockburst control effects of the support methods in the time-lag rockburst risk area.

[0015] S6. Based on the influence of special geological structures and support methods on time-delay rockburst in open TBM tunnels in similar projects, the probability of time-delay rockburst under different conditions is obtained, and a time-delay rockburst probability table is established;

[0016] S7. Substitute the analysis results of the support mode of the time-lag rockburst risk area and the special geological structure area into the time-lag rockburst occurrence probability table to obtain the probability of time-lag rockburst occurring in the time-lag rockburst risk area.

[0017] Furthermore, in step S1, immediate high-stress failure refers to high-stress failure occurring within a range of three times the tunnel diameter from the tunnel face, including immediate rockburst, immediate spalling, and immediate stress-type collapse.

[0018] The range of the time-lag rockburst risk assessment unit is the range from the rear 1 times of the hole diameter of the rear boundary of the immediate high-stress damage zone to the front 1 times of the hole diameter of the front boundary.

[0019] Furthermore, in step S2, TBM parameters include: total thrust, penetration and cutterhead torque.

[0020] Furthermore, in step S3, the TBM parameter change characteristics include overall size, fluctuation degree and variation range; wherein the overall size is described by the average value, the fluctuation degree is described by the standard deviation, and the variation range is described by the range.

[0021] Furthermore, in step S5, the support methods include: no support, anchor net support, steel arch frame & anchor rod support, anchor net spray support and steel arch frame & anchor net spray support, and the corresponding support levels are: level 0, level 1, level 2, level 3, level 4 and level 5; when the operation of the support method does not meet the specifications or the strength is insufficient, the support level is downgraded.

[0022] Furthermore, in step S6, the probability of occurrence of time-delay rockburst is expressed as P;

[0023] When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P1;

[0024] When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure area within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P2;

[0025] When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P3;

[0026] When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure zone within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst occurrence is expressed as P4.

[0027] Furthermore, a storage medium is provided, the storage medium comprising a stored program, wherein when the program is run, the method for rapid assessment of time-lag rockburst risk in an open TBM tunnel is executed.

[0028] Furthermore, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method for rapid assessment of time-lag rockburst risk in an open TBM tunnel through the computer program.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] This invention provides a rapid assessment method for time-lag rockburst risk in open TBM tunnels. This method requires neither testing of in-situ stress and in-situ rock mechanical properties nor microseismic or acoustic emission monitoring. Its assessment indicators utilize real-time high-stress failure information, TBM parameters, and on-site geological and support data, making them relatively easy to obtain. This method enables rapid assessment of the time-lag rockburst risk segments and risk probabilities in open TBM tunnels, providing a scientific basis for targeted preventive measures, thereby effectively avoiding or reducing the risk of time-lag rockbursts and ensuring the safety of open TBM tunnel construction.

[0031] Based on the above reasons, the present invention can be widely promoted in the field of rockburst risk assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 This is a flow chart of the method for rapid assessment of time-delay rockburst risk in an open TBM tunnel in the present invention.

[0034] Figure 2 This is the instantaneous destruction distribution diagram of the K54+170~K54+270 section in the embodiment of the present invention.

[0035] Figure 3 This is a curve chart showing the changes in TBM parameters in the K54+170~K54+270 section as a function of tunnel mileage in an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of the spatial relationship between the time-lag rockburst risk zone and the fault in an embodiment of the present invention.

[0037] Figure 5 This is the layout diagram of the initial support method in the K54+170~K54+270 section in an embodiment of the present invention.

[0038] Figure 6 This is a real-time diagram of a time-delay rockburst in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] like Figure 1 As shown, the present invention provides a method for rapid assessment of time-delay rockburst risk in an open TBM tunnel, the specific steps of which include:

[0042] S1. Record the distribution of immediate high-stress failure zones in the excavated tunnel section and determine the scope of the time-lag rockburst risk assessment unit.

[0043] S2. Obtain and organize TBM parameters in the time-lag rockburst risk assessment unit;

[0044] S3. Divide the risk assessment units that meet the TBM parameter change characteristic conditions into time-lag rockburst risk areas;

[0045] S4. Obtain a topographic map of the tunnel site, tunnel geological data, and advanced geological prediction results for the unexcavated area, and analyze whether there is a special geological structure within three times the tunnel diameter in the time-lag rockburst risk zone;

[0046] S5. Obtain support data for the excavated area and analyze the rockburst control effects of the support methods in the time-lag rockburst risk area.

[0047] S6. Based on the influence of special geological structures and support methods on time-delay rockburst in open TBM tunnels in similar projects, the probability of time-delay rockburst under different conditions is obtained, and a time-delay rockburst probability table is established;

[0048] S7. Substitute the analysis results of the support mode of the time-lag rockburst risk area and the special geological structure area into the time-lag rockburst occurrence probability table to obtain the probability of time-lag rockburst occurring in the time-lag rockburst risk area.

[0049] In a specific implementation, as a preferred embodiment of the present invention, in step S1, the immediate high-stress failure refers to high-stress failure occurring within a range of three times the tunnel diameter from the tunnel face, including immediate rockburst, immediate spalling, and immediate stress-type collapse.

[0050] The range of the time-lag rockburst risk assessment unit is the range from the rear 1 times of the hole diameter of the rear boundary of the immediate high-stress damage zone to the front 1 times of the hole diameter of the front boundary.

[0051] In specific implementation, as a preferred embodiment of the present invention, in step S2, the TBM parameters include: total thrust, penetration and cutterhead torque.

[0052] In specific implementation, as a preferred embodiment of the present invention, in step S3, the TBM parameter change characteristics include overall size, fluctuation degree and variation range; wherein, the overall size is described by the average value, the fluctuation degree is described by the standard deviation, and the variation range is described by the range.

[0053] During implementation, the special geological structural areas include river valley stress areas, areas with significant surface fluctuations, or areas with faults, folds, extended mineral strips or alteration zones;

[0054] In specific implementation, as a preferred embodiment of the present invention, in step S5, the support methods include: no support, anchor net support, steel arch frame & anchor rod support, anchor net spray support and steel arch frame & anchor net spray support, and the corresponding support levels are: level 0, level 1, level 2, level 3, level 4 and level 5; when the operation of the support method does not meet the specifications or the strength is insufficient, such as insufficient number of anchor rods, insufficient thickness of concrete spray layer, etc., the support level needs to be downgraded.

[0055] In specific implementation, as a preferred embodiment of the present invention, in step S6, the probability of occurrence of time-delay rockburst is expressed as P;

[0056] When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P1;

[0057] When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure area within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P2;

[0058] When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P3;

[0059] When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure zone within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst occurrence is expressed as P4.

[0060] During implementation, the time-lag type rock burst occurrence probability table is shown in Table 1:

[0061] Table 1 Probability of time-delayed rockburst

[0062]

[0063] P1, P2, P3, and P4 are the specific probability values ​​of time-delay rockburst under corresponding conditions. They can be obtained based on the influence of special geological structures and support methods on time-delay rockburst in open TBM tunnels in similar projects.

[0064] In a specific implementation, as a preferred embodiment of the present invention, a storage medium includes a stored program, wherein when the program is run, the method for rapid assessment of time-lag rockburst risk in an open TBM tunnel is executed.

[0065] In specific implementation, as a preferred embodiment of the present invention, an electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor executes the method for rapid assessment of time-lag rockburst risk in an open TBM tunnel through the computer program.

[0066] Example

[0067] like Figure 1 As shown in the figure, the present invention provides a rapid assessment method for the time-delay rockburst risk of an open TBM tunnel. Taking an open TBM tunnel as an example, the cross section is circular, with a diameter of 7.0m, and the lithology is mainly Carboniferous tuff. The K54+170~270 section is used as an analysis case, and the distribution location of the immediate high-stress failure that occurred during the excavation process in this area is recorded. The results are as follows: Figure 2 As shown. Figure 2It can be seen that the immediate high-stress failure in the K54+170-270 section is primarily immediate rockburst, with rockburst levels ranging from mild to moderate. The interval from the 7 m behind the rear boundary to the 7 m before the front boundary of each immediate rockburst crater is divided into time-delay rockburst risk assessment units. The time-delay rockburst risk assessment units, in descending order of tunnel mileage, are: K54+170-K54+179, K54+171-K54+197, K54+186.5-K54+206, K54+199-K54+213, K54+209.5-K54+229, K54+220.5-K54+238, and K54+224-K54+249.

[0068] Obtain the TBM parameters in each time-delay rockburst assessment unit, and exclude the data during the TBM startup process, TBM shutdown process, and TBM stop excavation period. Finally, draw the curve of TBM parameters changing with tunnel mileage. The results are as follows: Figure 3 shown.

[0069] The mean, standard deviation, and range of TBM parameters in each time-delay rockburst assessment unit were calculated using S4, and the results are shown in Table 2.

[0070] Table 2 Calculation results of TBM parameter variation characteristics within each time-lag rockburst assessment unit

[0071]

[0072] Statistics from cases under similar conditions reveal that TBM parameters in time-lag rockburst zones exhibit significant fluctuations. Specific characteristics are as follows: average total thrust force >14,000 kN, standard deviation >1,200 kN, and range >3,000 kN; average penetration <6 mm·r-1, standard deviation >1 mm·r-1, and range >3 mm·r-1; average cutterhead torque >1,500 N·m, standard deviation >200 N·m, and range >1,000 N·m. When TBM parameters in a time-lag rockburst risk assessment unit meet these characteristics, the unit is classified as a time-lag rockburst risk zone. Therefore, the K54+199–K54+213 section is classified as a time-lag rockburst risk zone; the remaining assessment units do not meet these characteristics.

[0073] Through the analysis of the topographic map of the tunnel site and the geological data of the excavated area, two nearly parallel faults are developed in the K54+222~K54+250 section near the K54+199~K54+213 section, such as Figure 4As shown in the figure, it indicates that there is a special geological structure area near the time-delay rockburst risk area. Through the analysis of the support data of the excavated area, the K54+199~K54+213 section adopts anchor mesh spraying support, corresponding to the support level of 4, but its support area is randomly distributed and the number is relatively insufficient, so it needs to be downgraded. The final support level is determined to be 3; the highest support level in the region or adjacent to the immediate rockburst area occurs in the K54+213~K54+254 section, which adopts steel arch frame & anchor mesh spraying support, corresponding to the support level of 5. Figure 5 shown.

[0074] By analyzing case studies of similar projects, we analyzed the impact of special geological structures and support methods on time-delay rockbursts in open TBM tunnels. We obtained the probability of time-delay rockbursts under different conditions and established a table of time-delay rockburst occurrence probabilities, as shown in Table 3.

[0075] Table 3 Probability of time-delayed rockburst

[0076]

[0077] The analysis results show that the support level within the time-lag rockburst risk zone is lower than the highest support level within the region or in adjacent immediate rockburst zones. The time-lag rockburst risk zone is determined to be K54+199 to K54+213, with a probability of P = 95%.

[0078] During the subsequent construction process, a time-delayed rockburst occurred in the K54+199~K54+213 area on October 22, 2021. The excavation time of this area was delayed by 94 days, the distance from the tunnel face was delayed by 769m, and the size of the blast pit was 13m×6m×1.2m (length×width×depth). Figure 6 As shown, the evaluation results are consistent with the actual occurrence.

[0079] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0080] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] In the embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0082] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0083] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0084] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), a mobile hard drive, a magnetic disk, or an optical disk.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid assessment method for time-delay rockburst risk in an open TBM tunnel, characterized by: The specific steps include: S1. Record the distribution of immediate high-stress failure zones in the excavated tunnel section and determine the scope of the time-lag rockburst risk assessment unit. S2. Obtain and organize TBM parameters in the time-lag rockburst risk assessment unit; S3. Divide the risk assessment units that meet the TBM parameter change characteristic conditions into time-lag rockburst risk areas; S4. Obtain a topographic map of the tunnel site, tunnel geological data, and advanced geological prediction results for the unexcavated area, and analyze whether there is a special geological structure within three times the tunnel diameter in the time-lag rockburst risk zone; S5. Obtain support data for the excavated area and analyze the rockburst control effects of the support methods in the time-lag rockburst risk area. S6. Based on the influence of special geological structures and support methods on time-delay rockburst in open TBM tunnels in similar projects, the probability of time-delay rockburst under different conditions is obtained, and a time-delay rockburst probability table is established; S7. Substitute the analysis results of the support mode of the time-lag rockburst risk area and the special geological structure area into the time-lag rockburst occurrence probability table to obtain the probability of time-lag rockburst occurring in the time-lag rockburst risk area.

2. The method for rapid assessment of time-delay rockburst risk in an open TBM tunnel according to claim 1 is characterized in that: In step S1, the immediate high-stress failure refers to high-stress failure occurring within a range of three times the tunnel diameter from the tunnel face, including immediate rockburst, immediate spalling, and immediate stress-type collapse. The range of the time-lag rockburst risk assessment unit is the range from the rear 1 times of the hole diameter of the rear boundary of the immediate high-stress damage zone to the front 1 times of the hole diameter of the front boundary.

3. The method for rapid assessment of time-delay rockburst risk in an open TBM tunnel according to claim 1 is characterized in that: In step S2, TBM parameters include: total thrust, penetration and cutterhead torque.

4. The method for rapid assessment of time-delay rockburst risk in an open TBM tunnel according to claim 1, characterized in that: In step S3, the TBM parameter change characteristics include overall size, fluctuation degree and variation range; wherein the overall size is described by the average value, the fluctuation degree is described by the standard deviation, and the variation range is described by the range.

5. The method for rapid assessment of time-delay rockburst risk in an open TBM tunnel according to claim 1, characterized in that: In step S5, the support methods include: no support, anchor net support, steel arch frame & anchor rod support, anchor net spray support and steel arch frame & anchor net spray support, and the corresponding support levels are: level 0, level 1, level 2, level 3, level 4 and level 5; when the operation of the support method does not meet the specifications or the strength is insufficient, the support level is downgraded.

6. The method for rapid assessment of time-delay rockburst risk in an open TBM tunnel according to claim 1, characterized in that: In step S6, the probability of occurrence of time-delay rockburst is expressed as P; When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P1; When the support level in the time-lag rockburst risk zone is not lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure area within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P2; When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is no special geological structure within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst is expressed as P3; When the support level in the time-lag rockburst risk zone is lower than the highest support level in the region or in the adjacent immediate rockburst zone, and there is a special geological structure zone within three times the tunnel diameter of the time-lag rockburst risk zone, the probability of time-lag rockburst occurrence is expressed as P4.

7. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is run, the method according to any one of claims 1 to 6 is executed.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: The processor executes the method according to any one of claims 1 to 6 by running the computer program.

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