A method, device and system for determining rockburst pre-blasting parameters in TBM construction

Abstract

The present invention discloses a method, device, and system for determining rockburst pre-blasting parameters for TBM construction, relates to the technical field of TBM construction, and can solve the problem of active prevention and control of rockburst during TBM construction. An embodiment of the present invention discloses a method for determining rockburst pre-blasting parameters for TBM construction, comprising the steps of: statistically analyzing rockburst point position parameters and intensity parameters after the TBM drills through a reference section; constructing a three-dimensional coordinate system, importing the rockburst point position parameters and influence radius parameters into the three-dimensional coordinate system, and generating rockburst influence sphere models corresponding to several rockburst points; partitioning the several rockburst influence sphere models N times, and obtaining N times the equivalent center of mass position parameters and equivalent radius parameters corresponding to several rockburst points in each area; obtaining pre-blasting position parameters and corresponding charge amount parameters for N comparison sections; obtaining rockburst point position parameters and intensity parameters after pre-blasting in the N comparison sections, and comparing to obtain the pre-blasting parameters in the best comparison section.

Description

Technical Field

[0001] The present invention relates to the technical field of TBM construction, and in particular to a method, device and system for determining rockburst pre-blasting parameters in TBM construction. Background Art

[0002] Rock burst is one of the major geological hazards in the TBM tunneling process. It can damage equipment at the least, injure people at the worst, and cause downtime. Extra-large rock burst is more likely to cause devastating damage to the TBM, directly affecting the progress of the entire project and causing huge economic losses. Therefore, the prevention and control of rock burst is an important issue in TBM tunnel construction.

[0003] At present, during TBM tunnel construction, the prevention and control of TBM rock bursts mainly relies on the pre-installed support system. However, conventional support system means can only passively wait for the occurrence of rock bursts and then rely on support materials to resist the impact of rock bursts. Once the rock burst phenomenon exceeds the preset threshold of the support system, it will have unpredictable impacts on the entire project. Therefore, there is an urgent need for a technical solution that can actively prevent and control rock bursts, thereby controlling and mitigating the intensity of rock bursts and keeping the impact of rock bursts on the project within a controllable range.

[0004] Based on the above background, the inventors have designed a method, device and system for determining rockburst pre-blasting parameters for TBM construction to solve at least one of the above problems, and thus proposed the present application. Summary of the Invention

[0005] The purpose of this application is to provide a method, device and system for determining rockburst pre-blasting parameters in TBM construction, which is used to solve the problem that in the existing TBM tunnel construction process, rockburst can only be passively prevented by relying on the pre-installed support system.

[0006] In one aspect, the present application provides a method for determining rockburst pre-blasting parameters for TBM construction, comprising the following steps:

[0007] S1. Monitor and calculate the location and intensity parameters of the rock burst point after the TBM drills into the reference section;

[0008] S2, constructing a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis, importing the position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters into the three-dimensional coordinate system, and generating rockburst influence spherical models corresponding to several rockburst points;

[0009] S3, partitioning several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtaining equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each region N times;

[0010] S4. Based on S3, obtain pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to the N sub-regions;

[0011] S5. Obtain rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

[0012] Optionally, in S1, after obtaining the location parameters and intensity parameters of the rockburst point, data cleaning and data conversion processing are required;

[0013] During data cleaning, it is necessary to eliminate rockburst points whose location and intensity parameters do not meet the preset requirements;

[0014] During data conversion processing, it is necessary to convert the rockburst point intensity parameters that meet the requirements into the corresponding impact radius parameters.

[0015] Optionally, in S1, when performing data cleaning processing, rock burst points whose location parameters do not meet the preset requirements include rock burst points located in the lower half of the tunnel and rock burst points whose distance from the central axis of the tunnel is greater than 2D, where: D is the diameter of the tunnel.

[0016] Optionally, when performing data cleaning processing, the rockburst point whose strength parameter does not meet the preset requirement is the rockburst point whose strength parameter is lower than the preset strength parameter.

[0017] Optionally, in S1, before performing data conversion processing, it is necessary to sample the rock material of the current TBM drilling section in advance and compare it with the rock types in a preset database to determine a conversion mapping curve between the strength and influence radius of the rock type;

[0018] When performing data conversion, the corresponding influence radius parameter is established based on the mapping curve and the intensity parameter of the rockburst point.

[0019] Optionally, in the S3, when partitioning, an interval partitioning method is used:

[0020] Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into equally spaced A parts along the Z axis, and then each divided part is further divided into B parts along the Z axis circumference, where: A and B are both positive integers.

[0021] Optionally, in the S3, when partitioning, a quantity partitioning method is used:

[0022] Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into equally spaced A parts along the Z axis, and then each divided part is further divided into B parts with the same number of rockburst points along the Z axis circumference, where A and B are both positive integers.

[0023] Optionally, in S4, the drug filling amount parameter of each region in the comparison segment needs to be determined according to the equivalent radius parameter corresponding to the region, and the drug filling amount parameter is positively correlated with the equivalent radius parameter:

[0024] The larger the equivalent radius parameter is, the larger the charge volume parameter is;

[0025] The smaller the equivalent radius parameter is, the smaller the charge volume parameter is.

[0026] On the other hand, the present application provides a device for determining rockburst pre-blasting parameters for TBM construction, comprising:

[0027] Perception module: used to monitor and collect statistics on the intensity and location parameters of rockburst points in the reference and comparison sections;

[0028] Spherical model generation module: used to construct a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis. The position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters are imported into the three-dimensional coordinate system to generate rockburst influence spherical models corresponding to several rockburst points.

[0029] Partition calculation module: used to partition several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtain the equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each area N times;

[0030] Pre-blasting parameter acquisition module: used to obtain the pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to N sub-regions;

[0031] Comparison module: used to obtain the rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain the pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

[0032] In a third aspect, the present application provides a system for determining rockburst pre-blasting parameters for TBM construction, comprising:

[0033] one or more processors;

[0034] A storage unit is used to store one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors can implement any one of the above methods for determining rockburst pre-blasting parameters for TBM construction.

[0035] Beneficial effects of the present invention:

[0036] The present application monitors and counts the rockburst point parameters of a reference section, imports them into a three-dimensional coordinate system, and then partitions them N times. After each partition, several rockburst points in each partition after each partition are converted into an equivalent rockburst influence sphere model, and the pre-blasting parameters after the sub-partition are obtained. After the pre-blasting, the subsequent rockburst point parameters are counted, and then the optimal pre-blasting parameters are obtained after N partitions. This allows the present application to use a better pre-blasting parameter during TBM drilling to concentrate and release the stress accumulated during TBM drilling in advance, effectively reducing the frequency and intensity of subsequent rockbursts, and effectively solving the problem that the existing technology can only provide passive protection against rockbursts of TBM drilling parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a system flow chart of Example 1 of this application.

[0038] Figure 2 This is a schematic diagram of Example 1 of the present application when partitioning is performed according to the spacing partitioning method.

[0039] Figure 3 This is a schematic diagram of Example 1 of the present application when partitioning is performed according to the quantity partitioning method.

[0040] Figure 4 This is a graph showing the mapping relationship between rock strength and influence radius in Example 1 of the present application. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0042] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "having," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] Example 1:

[0046] like Figures 1 to 4 As shown, this embodiment provides a method for determining rockburst pre-blasting parameters for TBM construction, comprising the following steps:

[0047] S1. Monitor and calculate the location and intensity parameters of the rock burst point after the TBM drills into the reference section;

[0048] S2, constructing a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis, importing the position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters into the three-dimensional coordinate system, and generating rockburst influence spherical models corresponding to several rockburst points;

[0049] S3, partitioning several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtaining equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each region N times, where N is a positive integer greater than or equal to 2;

[0050] S4. Based on S3, obtain pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to the N sub-regions;

[0051] S5. Obtain rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

[0052] This embodiment monitors and counts the rockburst point parameters of a reference section, imports them into a three-dimensional coordinate system, and then partitions them N times. After each partition, several rockburst points in each partition are converted into an equivalent rockburst influence sphere model, and pre-blasting parameters after the partition are obtained. After the pre-blasting, subsequent rockburst point parameters are counted, and then the optimal pre-blasting parameters are obtained after N partitions. This allows this embodiment to use an optimal pre-blasting parameter during TBM drilling to concentrate and release the stress accumulated during the TBM drilling process in advance, effectively reducing the frequency and intensity of subsequent rockbursts, and effectively solving the problem that the existing technology can only passively protect against rockbursts based on TBM drilling parameters.

[0053] In this embodiment, the statistical time period for rock burst points is concentrated within 24 hours after TBM drilling. During monitoring, existing technical means such as acoustic wave monitoring and seismic wave monitoring can be used for monitoring.

[0054] In this embodiment, the length of the comparison section is the same as the length of the reference section. The specific lengths of the comparison section and the reference section can be relative values ​​or fixed values ​​according to the overall length of the TBM tunnel construction.

[0055] In this embodiment, each partitioning corresponds to a comparison segment, and each time the partitioning is performed, the total number of regions after the partitioning corresponds to the total number of pre-blastings performed in the corresponding comparison segment.

[0056] In this embodiment, in S1, after obtaining the location parameters and intensity parameters of the rockburst point, data cleaning and data conversion are required;

[0057] During data cleaning, it is necessary to eliminate rockburst points whose location and intensity parameters do not meet the preset requirements;

[0058] During data conversion processing, it is necessary to convert the rockburst point intensity parameters that meet the requirements into the corresponding impact radius parameters.

[0059] By performing data cleaning and data conversion on the location parameters and intensity parameters of the rockburst points obtained in S1, it is possible to avoid the rockburst points with preset location and intensity requirements from interfering with subsequent steps and affecting the determination of the pre-blasting location parameters and charge amount parameters.

[0060] In this embodiment, in S1, when performing data cleaning processing, rock burst points whose location parameters do not meet the preset requirements include rock burst points located in the lower half of the tunnel and rock burst points whose distance from the central axis of the tunnel is greater than 2D, where: D is the diameter of the tunnel.

[0061] During TBM drilling, from a spatial scale, since rock burst is affected by TBM construction, its rock burst points are basically located within twice the tunnel diameter. Rock burst points exceeding twice the tunnel diameter have little impact on TBM construction. Its rock burst factor is usually sporadic and has little correlation with TBM construction. Therefore, in this embodiment, only rock burst points within 2 times the tunnel diameter are counted. Technical personnel can also set specific tunnel diameter multiples as needed, such as eliminating rock burst points outside 1.5D or 2.5D. At the same time, due to the effect of gravity, the high-incidence area of ​​rock burst points is mainly in the shoulder position above the tunnel. The intensity and frequency of rock burst points in the lower half of the tunnel are small, and have little impact on TBM construction. Therefore, pre-blasting unloading is usually not required.

[0062] In this embodiment, during data cleaning, rockburst points whose strength parameters do not meet preset requirements are treated as rockburst points whose strength parameters are lower than preset strength parameters, thereby avoiding invalid low-strength rockburst points and reducing resource usage of the entire system.

[0063] In this embodiment, Figure 4 As shown, in S1, before performing data conversion processing, it is necessary to sample the rock material of the current TBM drilling section in advance and compare it with the rock types in the preset database to determine the conversion mapping curve between the strength and influence radius of the rock type;

[0064] When performing data conversion, the corresponding influence radius parameter is established based on the mapping curve and the intensity parameter of the rockburst point.

[0065] The conversion mapping curve in this embodiment is a conversion mapping curve preset in the database. The conversion mapping curves of different rock types are different. When obtaining the conversion mapping curve, blasting of different intensities can be carried out in the rock type in advance, and the different impact radii corresponding to different blasting intensities can be measured. After multi-point connection and smoothing, the conversion mapping curve of the rock type can be obtained.

[0066] In this embodiment, Figure 2 As shown, in the S3, the interval partitioning method is adopted when partitioning:

[0067] Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into A parts with equal spacing along the Z axis, and then each of the divided parts is further divided into B parts along the Z axis circumference, where A and B are both positive integers. In this embodiment, Figure 2As shown, the values ​​of A and B are both 4, so the total number of regions in the current sub-division is 16, and the total number of pre-blastings in the comparison section corresponding to the current sub-division is 16. In this embodiment, the central angle of the arc corresponding to each region after partitioning is the same. The difference is that the rockburst influence sphere model in each region is different. In some embodiments, the specific values ​​of A and B can be set by technicians according to actual needs, and no further examples will be given here.

[0068] In some embodiments, as Figure 3 As shown, in the S3, the quantity partitioning method is used when partitioning:

[0069] Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into A parts with equal spacing along the Z axis, and then each of the divided parts is further divided into B parts with the same number of rockburst points along the Z axis circumference, where A and B are both positive integers. In this embodiment, Figure 3 As shown in the figure, the values ​​of A and B are both 4, so the total number of regions in the current sub-division is 16, and the total number of pre-blasting times of the comparison section corresponding to the current sub-division is 16. However, since the partitioning along the Z-axis is performed, each partitioned portion is further divided into B portions with the same number of rockburst points. Therefore, the central angle of the arc corresponding to each partitioned region is different, as shown in the figure. Figure 3 As shown in the figure, the number of rockburst influence sphere models is more concentrated near the tunnel shoulder, which makes the number of rockburst influence sphere models in each area close after zoning, avoiding the occurrence of pre-blasting points with excessive intensity during pre-blasting.

[0070] In this embodiment, in S4, the drug filling amount parameter of each region in the comparison segment needs to be determined according to the equivalent radius parameter corresponding to the region. The drug filling amount parameter is positively correlated with the equivalent radius parameter:

[0071] The larger the equivalent radius parameter is, the larger the charge volume parameter is;

[0072] The smaller the equivalent radius parameter is, the smaller the charge volume parameter is.

[0073] In some embodiments, a mapping relationship curve between the charge amount and the equivalent radius can also be preset in advance based on the sampled rock type. When determining the charge amount parameters, after obtaining the equivalent radius parameters corresponding to each area, the corresponding charge amount parameters can be obtained according to the mapping relationship curve. In some embodiments, the range of the charge amount parameters can be set to avoid the charge amount parameters being too large, resulting in a pre-blasting point where the pre-blasting charge parameters are too large, resulting in too high intensity during pre-blasting.

[0074] Example 2:

[0075] This embodiment provides a device for determining rockburst pre-blasting parameters for TBM construction, including:

[0076] Perception module: used to monitor and collect statistics on the intensity and location parameters of rockburst points in the reference and comparison sections;

[0077] Spherical model generation module: used to construct a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis. The position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters are imported into the three-dimensional coordinate system to generate rockburst influence spherical models corresponding to several rockburst points.

[0078] Partition calculation module: used to partition several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtain the equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each area N times;

[0079] Pre-blasting parameter acquisition module: used to obtain the pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to N sub-regions;

[0080] Comparison module: used to obtain the rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain the pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

[0081] Example 3:

[0082] This embodiment provides a system for determining rockburst pre-blasting parameters for TBM construction, including:

[0083] one or more processors;

[0084] The storage unit is used to store one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors can implement the method for determining rockburst pre-blasting parameters for TBM construction described in the above embodiment 1.

[0085] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining rockburst pre-blasting parameters in TBM construction, characterized in that: The following steps are involved: S1. Monitor and calculate the location and intensity parameters of the rock burst point after the TBM drills into the reference section; S2, constructing a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis, importing the position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters into the three-dimensional coordinate system, and generating rockburst influence spherical models corresponding to several rockburst points; S3, partitioning several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtaining equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each region N times; S4. Based on S3, obtain pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to the N sub-regions; S5. Obtain rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

2. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 1, wherein: In S1, after obtaining the location parameters and intensity parameters of the rockburst point, data cleaning and data conversion are required; During data cleaning, it is necessary to eliminate rockburst points whose location and intensity parameters do not meet the preset requirements; During data conversion processing, it is necessary to convert the rockburst point intensity parameters that meet the requirements into the corresponding impact radius parameters.

3. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 2, wherein: In S1, when performing data cleaning processing, the rock burst points whose location parameters do not meet the preset requirements include rock burst points located in the lower half of the tunnel and rock burst points whose distance from the tunnel centerline is greater than 2D, where D is the diameter of the tunnel.

4. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 2, wherein: When performing data cleaning processing, the rockburst points whose strength parameters do not meet the preset requirements are the rockburst points whose strength parameters are lower than the preset strength parameters.

5. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 2, wherein: In S1, before performing data conversion, the rock material of the current TBM drilling section needs to be sampled in advance and compared with the rock types in the preset database to determine the conversion mapping curve between the strength and influence radius of the rock type; When performing data conversion, the corresponding influence radius parameter is established based on the mapping curve and the intensity parameter of the rockburst point.

6. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 1, characterized in that: In the S3, the interval partitioning method is used for partitioning: Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into equally spaced A parts along the Z axis, and then each divided part is further divided into B parts along the Z axis circumference, where: A and B are both positive integers.

7. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 1, characterized in that: In the S3, the quantity partitioning method is used when partitioning: Each time the partitioning is performed, the coverage area of ​​the rockburst impact sphere model is first divided into equally spaced A parts along the Z axis, and then each divided part is further divided into B parts with the same number of rockburst points along the Z axis circumference, where A and B are both positive integers.

8. The method for determining rockburst pre-blasting parameters in TBM construction according to claim 1, characterized in that: In S4, the drug filling amount parameter of each area in the comparison segment needs to be determined according to the equivalent radius parameter corresponding to the area. The drug filling amount parameter is positively correlated with the equivalent radius parameter: The larger the equivalent radius parameter is, the larger the charge volume parameter is; The smaller the equivalent radius parameter is, the smaller the charge volume parameter is.

9. A device for determining rockburst pre-blasting parameters for TBM construction, characterized in that: include: Perception module: used to monitor and collect statistics on the intensity and location parameters of rockburst points in the reference and comparison sections; Spherical model generation module: used to construct a three-dimensional coordinate system with the horizontal direction as the X-axis, the vertical direction as the Y-axis, and the drilling direction as the Z-axis. The position parameters of the rockburst point and the influence radius parameters corresponding to its intensity parameters are imported into the three-dimensional coordinate system to generate rockburst influence spherical models corresponding to several rockburst points. Partition calculation module: used to partition several rockburst impact sphere models in the three-dimensional coordinate system N times, and obtain the equivalent centroid position parameters and equivalent radius parameters corresponding to several rockburst points in each area N times; Pre-blasting parameter acquisition module: used to obtain the pre-blasting position parameters and corresponding charge amount parameters of N comparison segments corresponding to N sub-regions; Comparison module: used to obtain the rockburst point position parameters and intensity parameters after pre-blasting in N comparison sections, and obtain the pre-blasting position parameters and charge amount parameters in the best comparison section after denoising.

10. A rockburst pre-blasting parameter determination system for TBM construction, characterized in that: include: one or more processors; A storage unit for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method for determining rockburst pre-blasting parameters for TBM construction as described in any one of claims 1 to 8.

Images