Perimeter blasthole area blasting explosive unit consumption calculation method, computer device and readable storage medium

Abstract

The present application provides a kind of peripheral blasthole area blasting explosive unit consumption calculation method, computer device and readable storage medium, peripheral blasthole area blasting explosive unit consumption calculation method includes confirming linear charge density according to lithology condition;Length of each blasthole in peripheral blasthole area is obtained, and the length sum of each blasthole in peripheral blasthole area is calculated;The rock volume of peripheral blasthole area is obtained;According to linear charge density, length sum and rock volume, the blasting explosive unit consumption of peripheral blasthole area is calculated and generated.The computer device can realize the steps of the above-mentioned peripheral blasthole area blasting explosive unit consumption calculation method.The computer readable storage medium can realize the steps of the above-mentioned peripheral blasthole area blasting explosive unit consumption calculation method.The present application ensures that the crack between blasthole is penetrated, forms continuous regular smooth surface, avoids blasting damage to spread to deep surrounding rock, greatly reduces overbreak, underbreak phenomenon, effectively protects tunnel surrounding rock integrity and structural stability.

Description

Technical Field

[0001] This invention relates to the field of tunnel and underground engineering blasting technology, specifically to a method for calculating the unit consumption of explosives in a perimeter blasting borehole area, a computer device, and a readable storage medium. Background Technology

[0002] In tunnel drilling and blasting construction, the rationality of blasting design is the key to affecting excavation efficiency, forming quality and economic benefits.

[0003] Currently, the mainstream method for determining explosive consumption per unit area in engineering practice still heavily relies on empirical analogy and reference to standard tables. Designers first consult manuals to select an empirical value for average explosive consumption per unit area applicable to the entire excavation section, based on the rock mass grade and cross-sectional dimensions. They then calculate the total charge and allocate the charge to each borehole based on their personal experience.

[0004] This method is based on the idealized assumption that "the rock mass at the tunnel face is homogeneous and the blasting resistance is the same in all areas." Its design process is simplistic and crude, ignoring the differences in blasting mechanics and functional requirements between different areas such as the cut, auxiliary, and surrounding areas. It uses a single average energy consumption value to indiscriminately input energy to all areas of the tunnel face, failing to accurately match the energy demand gradient of these zones. This leads to a severe disconnect between energy supply and the actual physical process of rock fragmentation. Furthermore, in practice, the overall charge is often blindly increased to ensure the cut effect, resulting in a serious energy surplus in the surrounding blast hole areas. This not only wastes explosives but also easily leads to excessive damage to the surrounding rock, severe over- and under-cutting, and a high rate of large blocks due to uncontrolled energy. Summary of the Invention

[0005] The primary objective of this invention is to provide a method for calculating the unit consumption of explosives in the perimeter blast hole area. This method accurately calculates the unit consumption of explosives in the perimeter blast hole area, thereby avoiding waste of explosives and achieving a more ideal blasting effect.

[0006] The second objective of this invention is to provide a computer device capable of implementing the steps of the above-described method for calculating the unit consumption of explosives in the peripheral borehole area.

[0007] A third objective of this invention is to provide a computer-readable storage medium capable of implementing the steps of the above-described method for calculating the unit consumption of explosives in the peripheral borehole area.

[0008] The method for calculating the unit consumption of blasting explosives in the peripheral blast hole area provided by the first objective of this invention includes: confirming the linear charge density based on lithological conditions; obtaining the length of each blast hole in the peripheral blast hole area and calculating the total length of each blast hole in the peripheral blast hole area; obtaining the rock volume of the peripheral blast hole area; and calculating the unit consumption of blasting explosives in the peripheral blast hole area based on the linear charge density, the total length, and the rock volume.

[0009] A further approach is to determine the charge density in the step of confirming the charge density based on lithological conditions, with the charge density ranging from 0.1 to 0.5 kg / m.

[0010] A further approach involves determining the linear charge density based on lithological conditions, including: establishing a single-hole numerical model with a borehole diameter of 40mm and a perimeter length of 100cm; conducting simulation calculations using an interval charging method; and carrying out multiple sets of numerical simulation tests under different linear charge density conditions for three types of lithology: hard rock (>60MPa), medium-hard rock (30~60MPa), and soft rock (<30MPa). By analyzing the evolution process of surrounding rock damage after blasting and the final damage distribution, the damage propagation range can be obtained.

[0011] A further approach is to introduce a damage variable D to characterize the degree of damage to the surrounding rock in the step of analyzing the evolution process and final damage distribution of the surrounding rock after blasting; when D≥0.19, it is determined to be an effective damage zone.

[0012] A further proposed approach is to define the proportion of surrounding rock damage expansion as the percentage of the effective damage area within the control range of the surrounding contour after determining the effective damage area.

[0013] A further approach involves defining the proportion of the effective damage zone within the controlled contour area as the damage propagation ratio of the surrounding rock. Following this step, statistical analysis is performed on the damage cloud maps under different working conditions. The corresponding linear charge density ranges for the three lithologies are as follows: for soft rock, the linear charge density range is 0.1~0.2. The linear charge density range for medium-hard rocks is 0.25~0.4. The linear charge density for hard rock is in the range of 0.3~0.5. .

[0014] A further proposed approach is to determine the optimal linear charge density for soft rock as 0.1. The corresponding damage propagation rate of the surrounding rock is approximately 48%; the optimal linear charge density for medium-hard rock is determined to be 0.25. The corresponding damage propagation rate of the surrounding rock is approximately 45%; the optimal linear charge density for hard rock is determined to be 0.3. The corresponding damage extension rate of the surrounding rock is approximately 44%.

[0015] As can be seen from the above scheme, this invention, combined with the characteristics of smooth blasting technology, no longer uses a uniform volumetric energy consumption calculation method, but instead uses linear charge density to calculate the energy consumption of explosives in the surrounding boreholes. Numerical simulation determines the optimal linear charge density under different lithologies, strictly limiting the effective damage zone expansion range of the surrounding rock. Under the optimal parameters for soft rock, medium-hard rock, and hard rock, the damage expansion ratio of the surrounding rock is controlled at 48%, 45%, and 44%, respectively. While ensuring the continuity of cracks between boreholes and forming a continuous and regular smooth surface, it avoids the spread of blasting damage to the deeper parts of the surrounding rock, significantly reduces over-excavation and under-excavation, and effectively protects the integrity and structural stability of the tunnel surrounding rock.

[0016] The second objective of this invention is to provide a computer device comprising a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the above-described method for calculating the unit consumption of blasting explosives in the peripheral blast hole area.

[0017] The third objective of this invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a controller, implements the steps of the above-described method for calculating the unit consumption of blasting explosives in the surrounding borehole area. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of tunnel blasting zones, representing an embodiment of the method for calculating the unit consumption of blasting explosives in the surrounding blast hole area of ​​the present invention. Figure 2 This is a diagram showing the fractured rock morphology of an embodiment of the method for calculating the unit consumption of blasting explosives in the surrounding blast hole area of ​​the present invention. Figure 3 This is a simulation diagram of linear charge density for different rock types, representing an embodiment of the method for calculating the unit consumption of blasting explosives in the surrounding borehole area according to the present invention. Detailed Implementation

[0019] Example of a method for calculating the unit consumption of explosives in the surrounding blast hole area See Figure 1 Based on the tunnel's geological conditions and cross-sectional shape, and according to the type of blast holes at the tunnel face, the blasting area is divided into four zones from the inside out: cut-out blast hole zone I, auxiliary blast hole zone II, peripheral blast hole zone III, and floor blast hole zone IV. Specifically, cut-out blast hole zone I, auxiliary blast hole zone II, and peripheral blast hole zone III are arranged sequentially from the inside out. Floor blast hole zone IV is located below cut-out blast hole zone I and auxiliary blast hole zone II, and the bottom sides of peripheral blast hole zone III are located on the left and right outer sides of floor blast hole zone IV, respectively.

[0020] Among them, the slotted blast hole area I is the core area, responsible for creating the initial free surface. It has the greatest explosive clamping effect, and the explosive energy is tightly contained, so a large amount must be consumed in crushing the rock. Therefore, it requires the largest amount of explosives. Auxiliary blast hole area II is located between the slotted blast hole area and the outer ring. It is responsible for gradually expanding the slot cavity. Auxiliary blasting is based on the free surface created by slotting. The explosive stress wave can be fully reflected through the free surface to form efficient tensile failure, easily "tearing" the rock off. Therefore, the explosive consumption per unit of explosive in the auxiliary blast hole area is relatively lower than that in the slotted blast hole area.

[0021] Peripheral blast hole zone III consists of blast holes around the outline, responsible for forming a smooth excavation boundary, controlling over-excavation and under-excavation, and protecting the stability of the surrounding rock.

[0022] The bottom plate blast hole area IV is the blast hole area in the bottom region. It is necessary to overcome the weight of the rock and the clamping force to ensure that the bottom plate is flat and has a certain throwing effect.

[0023] The calculation method for the unit consumption of explosives in the surrounding blast hole zone III includes the following four steps: Determine the charge density based on lithological conditions; Obtain the length of each borehole in the surrounding borehole area, and calculate the total length of each borehole in the surrounding borehole area; Obtain the rock volume of the surrounding borehole area; The explosive consumption per unit area of ​​the surrounding borehole zone is calculated based on the density and total length of the linear charge and the volume of the rock.

[0024] In the step of determining the density of linear charges based on lithological conditions: First, based on the saturated uniaxial compressive strength of rocks, rocks are divided into three categories: hard rock (>60MPa), medium-hard rock (30~60MPa), and soft rock (<30MPa).

[0025] The area around the perimeter holes employs smooth blasting technology, with the charge amount determined by the linear charge density. Control, rather than volumetric consumption. Based on the linear charge density values ​​for peripheral holes in conventional smooth blasting, the linear charge density ranges from 0.1 to 0.5 kg / m. A reasonable value should be selected based on the specific lithological conditions, with a lower value for soft rock and a higher value for hard rock.

[0026] To quantitatively analyze the influence of linear charge density on the damage range of surrounding rock under different lithological conditions, a single-hole numerical model with a borehole diameter of 40 mm and a perimeter length of 100 cm was established. The simulation calculation was carried out using an interval charging method. For three types of lithology, namely hard rock (>60 MPa), medium-hard rock (30~60 MPa), and soft rock (<30 MPa), multiple sets of numerical simulation tests were carried out under different linear charge density conditions. By analyzing the evolution process of surrounding rock damage after blasting and the final damage distribution, the damage expansion range was obtained.

[0027] In the step of analyzing the evolution process and final damage distribution of the surrounding rock after blasting, a damage variable D is introduced to characterize the degree of damage to the surrounding rock; when D ≥ 0.19, it is determined to be an effective damage zone. After determining the effective damage zone, the proportion of the effective damage zone within the surrounding contour control range is defined as the surrounding rock damage expansion ratio.

[0028] After defining the proportion of the effective damage zone within the controlled contour area as the damage propagation ratio of the surrounding rock, statistical analysis was performed on the damage cloud maps under different working conditions. The corresponding linear charge density ranges for the three lithologies were as follows: the linear charge density range for soft rock was 0.1~0.2. The linear charge density range for medium-hard rocks is (0.25~0.4). The linear charge density range for hard rock is (0.3~0.5). ).

[0029] Even better, the optimal linear charge density for soft rock was determined to be 0.1. The corresponding damage propagation rate of the surrounding rock is approximately 48%; the optimal linear charge density for medium-hard rock is determined to be 0.25. The corresponding damage propagation rate of the surrounding rock is approximately 45%; the optimal linear charge density for hard rock is determined to be 0.3. The corresponding damage extension rate of the surrounding rock is approximately 44%.

[0030] The aforementioned expansion ratios are derived from statistical results of the damaged area in numerical simulations, reflecting the differences in fracture propagation capacity and energy utilization efficiency under different lithological conditions. Specifically, harder lithology restricts fracture propagation, resulting in a relatively smaller damage propagation ratio.

[0031] Based on the above analysis, the damage to the surrounding rock caused by different linear charge densities for the three lithologies was analyzed. The linear charge density for the soft rock was 0.1. The linear charge density for medium-hard rock is 0.25. The linear charge density for hard rock is 0.3. .

[0032] The specific explosive consumption in the surrounding borehole zone III is based on the linear charge density in the smooth blasting parameters used. Total length of surrounding holes The total amount of explosive in the surrounding hole area is calculated by multiplication, and then divided by the rock volume of the surrounding hole area to obtain the area explosive consumption per unit volume in the surrounding hole area. .

[0033]

[0034] In the formula, The charge density of the peripheral holes; The sum of the lengths of all holes in the surrounding hole area; The volume of rock in the surrounding borehole area.

[0035] In traditional tunnel drilling and blasting construction, the determination of explosive consumption per unit area largely relies on past engineering experience and standardized forms, selecting a uniform average consumption value to calculate and allocate the explosive quantity. This design approach assumes that the rock mass at the tunnel face is uniform and that the blasting resistance is the same everywhere, without distinguishing the actual role played by different blast holes. On-site, in order to ensure the excavation effect, the overall explosive quantity is often increased, resulting in excess energy in the surrounding holes. This not only wastes explosives but also easily damages the surrounding rock and can lead to a series of problems such as over-excavation, under-excavation, and a high percentage of large rocks.

[0036] To address this situation, this invention focuses on optimizing the blasting parameters of the surrounding holes to control surrounding rock damage. Combining smooth blasting technology, it uses linear charge density to control the charge amount in the surrounding holes. Specifically, lithology is first classified according to the uniaxial compressive strength of the rock, and a numerical model is established to conduct simulation analysis. Based on the surrounding rock damage judgment criteria, the optimal linear charge density for different rock masses is determined: 0.1 kg / m for soft rock, 0.25 kg / m for medium-hard rock, and 0.3 kg / m for hard rock.

[0037] Using these parameters, the proportion of surrounding rock damage expansion can be controlled at 48%, 45%, and 44% respectively, while ensuring the continuity and integrity of the excavation face outline. This effectively restrains the development of the damaged area into the deeper part of the surrounding rock, protects the integrity of the surrounding rock, significantly improves the quality of tunnel cross-section forming, and effectively curbs over-excavation and under-excavation problems.

[0038] In terms of explosive charge calculation, the actual unit consumption of surrounding holes is calculated by considering the linear charge density, total borehole length, and rock mass volume. This results in more precise explosive allocation, completely avoiding ineffective charges and directly reducing material consumption. Furthermore, the entire set of parameter values ​​and calculation methods has been quantitatively established, moving beyond reliance on personal experience and making the design results more reliable. Reasonable blasting energy output also leads to better rock fragmentation, a lower rate of large blocks, and reduced workload for subsequent slag removal and section trimming, significantly improving construction efficiency and overall economic benefits.

[0039] Computer device embodiment: The computer device of the present invention is a controller, including a processor and a memory, such as a microcontroller containing a central processing unit. Furthermore, the processor executes the computer program stored in the memory to implement the steps of the above-described method for calculating the unit consumption of explosives in the peripheral borehole area.

[0040] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0041] The memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system and at least one application program required for a function (such as sound playback, image playback, etc.); the data storage area can store data created based on the use of the phone (such as audio data, phonebook, etc.). Furthermore, the memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0042] Examples of computer-readable storage media: The computer-readable storage medium of the present invention can be any form of storage medium that can be read by the processor of a computer device, including but not limited to non-volatile memory, volatile memory, ferroelectric memory, etc. The computer-readable storage medium stores a computer program. When the processor of the computer device reads and executes the computer program stored in the memory, the steps of the above-mentioned method for calculating the unit consumption of blasting explosives in the surrounding blast hole area can be implemented.

[0043] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in computer-readable media can be appropriately added to or subtracted according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0044] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for calculating the unit consumption of blasting explosives in the surrounding blast hole area, characterized by: Determine the charge density based on lithological conditions; Obtain the length of each blast hole in the surrounding blast hole area, and calculate the sum of the lengths of each blast hole in the surrounding blast hole area; Obtain the rock volume of the surrounding borehole area; The explosive charge consumption per unit area of ​​the surrounding borehole zone is calculated based on the linear charge density, the total length, and the rock volume.

2. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 1, characterized in that: In the step of determining the linear charge density based on lithological conditions: The density of the linear charge ranges from 0.1 to 0.5 kg / m.

3. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 2, characterized in that: The step of determining the linear charge density based on lithological conditions includes: A single-hole numerical model with a borehole diameter of 40 mm and a perimeter length of 100 cm was established. The simulation calculation was carried out using an intermittent charging method. For three types of lithology, namely hard rock (>60 MPa), medium-hard rock (30~60 MPa), and soft rock (<30 MPa), multiple sets of numerical simulation tests were carried out under different linear charge densities. The damage evolution process and final damage distribution of the surrounding rock after blasting were analyzed to obtain the damage propagation range.

4. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 3, characterized in that: In the step of analyzing the evolution process and final damage distribution of the surrounding rock after blasting, the damage variable D is introduced to characterize the degree of damage to the surrounding rock. When D ≥ 0.19, it is determined to be an effective damage area.

5. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 4, characterized in that: After determining the effective damage area, the method further includes: The proportion of the effective damage zone within the surrounding contour control range is defined as the surrounding rock damage expansion ratio.

6. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 5, characterized in that: After defining the proportion of the effective damage zone within the controlled area of ​​the surrounding contour as the surrounding rock damage propagation ratio: Statistical analysis of damage contour maps under different working conditions revealed the following ranges for the corresponding linear charge density for the three lithologies: The linear charge density of the soft rock is in the range of 0.1~0.

2. ; The linear charge density for the medium-hard rock is in the range of 0.25~0.

4. ; The linear charge density for the hard rock is in the range of 0.3 to 0.

5. .

7. The method for calculating the unit consumption of blasting explosives in the surrounding blast hole area according to claim 6, characterized in that: The optimal linear charge density for the soft rock was determined to be 0.

1. The corresponding surrounding rock damage propagation rate is approximately 48%. The optimal linear charge density for the medium-hard rock was determined to be 0.

25. The corresponding surrounding rock damage propagation rate is approximately 45%; The optimal linear charge density for the hard rock was determined to be 0.

3. The corresponding damage extension rate of the surrounding rock is approximately 44%.

8. A computer device comprising a processor and a memory, characterized in that: The memory stores a computer program, which, when executed by the processor, implements the steps of the method for calculating the unit consumption of blasting explosives in the peripheral borehole area as described in any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the controller, it implements the steps of the method for calculating the unit consumption of blasting explosives in the peripheral borehole area as described in any one of claims 1 to 7.

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