Blast hole net structure

Abstract

The utility model provides a blast hole net structure and belongs to the field of open blasting, a blast area comprises a rock area, an ore area and an interface at the junction of the ore area and the rock area, the blast hole net structure comprises a first blast hole net, a second blast hole net and an empty hole net, the first blast hole net is arranged in the rock area, and the second blast hole net is arranged in the empty hole net. The second blast holes are formed in the ore area, and the empty hole net is arranged in the direction of the interface. In the blasting process, the first blasting hole net and the second blasting hole net are controlled to detonate according to the time sequence, an ore muck pile and a rock muck pile which are separated are formed in the rock area and the ore area, and the mine shoveling efficiency is greatly improved. And secondly, the empty hole net is arranged in the ore-rock interface area, after explosion stress waves on the two sides are transmitted to the empty hole net during blasting, the propagation intensity of the explosion waves can be greatly reduced, the influence of blasting vibration on rocks at the ore-rock interface is reduced, and therefore the ore-rock mixing condition is controlled, and the dilution rate in the blasting process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of open-pit mining, and in particular to a blasting hole network structure. Background Art

[0002] Failure to effectively control the separation of ore and rock during open-pit blasting can negatively impact mining operations in several ways. First, conventional blasting or large-scale, micro-differential blasting can result in the mixing of ore and waste rock, increasing the difficulty and cost of subsequent beneficiation and processing. This mixing not only affects ore grade but also wastes resources during the beneficiation process. Second, when ore and rock properties vary significantly, inadequate control can lead to poor blasting results, potentially resulting in over- or under-blasting. Over-blasting can disrupt the ore and rock structure, causing damage to the geological environment and increasing safety hazards; under-blasting can result in excessively large ore and rock fragments, increasing the difficulty and cost of subsequent mechanical crushing and transportation. Furthermore, mixed rock can affect production efficiency and reduce the mine's economic benefits. Therefore, effective ore and rock separation blasting in open-pit blasting is a crucial means of improving resource utilization, minimizing environmental damage, and enhancing economic efficiency. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the present application provides a blasting hole network structure, which can form two independent ore blasting piles and rock blasting piles after blasting through an empty hole network and two independent first blasting hole networks and a second blasting hole network, thereby achieving the technical effect of improving mine shoveling efficiency and increasing overall economic benefits.

[0004] An embodiment of the present application provides a blasting hole network structure, which is arranged in a blasting area, wherein the blasting area includes a rock area, an ore area, and an interface between the ore area and the rock area. The blasting hole network structure includes a first blasting hole network, a second blasting hole network, and an empty hole network. The first blasting hole network is arranged in the rock area, the second blasting hole is arranged in the ore area, and the empty hole network is arranged along the direction of the interface.

[0005] In the technical solution of the embodiment of the present application, the first blasting hole network and the second blasting hole network are controlled to be detonated in the rock area and the ore area respectively according to the timing, so that two separate ore blasting piles and rock blasting piles can be formed in the rock area and the ore area after blasting, which greatly facilitates mine shoveling, improves mine shoveling efficiency, and increases overall economic benefits. Secondly, in this embodiment, an empty hole network is provided in the ore-rock interface area. During blasting, after the explosion stress waves on both sides are transmitted to the empty hole network, the energy will be absorbed by the empty holes, which can greatly reduce the propagation intensity of the explosion wave and reduce the influence of the blasting vibration on the rock at the ore-rock interface, thereby controlling the mixing of ore and rock and reducing the depletion rate during the blasting process.

[0006] In some embodiments, the density of the empty hole network is greater than the density of the second blasting hole network, which is greater than the density of the first blasting hole network.

[0007] In this embodiment, by setting a high density of empty holes in the interface area between the ore and rock, the energy generated by the explosion of the blasting hole networks on both sides can be more fully absorbed during the blasting process, thereby further reducing the depletion rate during the blasting process. Secondly, in this embodiment, the density of the second blasting hole network is greater than the density of the first blasting hole network, so that the block size of the rock area after blasting is significantly larger than that of the ore area, and thus two blast piles can be clearly formed on site after the blasting.

[0008] In some embodiments, the first blasting hole network includes a first detonation hole, a first delayed blasting hole, a first explosive and a first delay line. The first detonation hole is arranged at the edge of the rock area away from the interface. The first delayed blasting holes are arranged in an array within the rock area. The first explosive is provided in both the first detonation hole and the first delayed blasting hole. The first explosive in the first detonation hole and the first delayed blasting hole is connected by the first extension line. The first extension line is used to control the detonation of the first explosive from the first detonation hole to the direction close to the interface.

[0009] In this embodiment, the first blasting hole and the first delayed blasting hole are detonated in chronological order by detonating hole by hole, so that the first blasting hole can create more free surfaces for the subsequent blasting hole, and the blasting stress wave is reflected more fully, thereby achieving the superposition effect of full utilization of the energy of the explosives, more fully breaking the rocks in the rock area, and making it easier to shovel in the mine and improving the shovel efficiency of the mine.

[0010] In some embodiments, the second blasting hole network includes a second blasting hole, a second delayed blasting hole, a second explosive and a second delay line. The second extended blasting holes are evenly arranged in the ore area in an array form, the second blasting hole is arranged in the middle of the ore area, the second explosive is set in the second blasting hole and the second extended blasting hole, the second explosive is connected in the second blasting hole and the second delayed blasting hole through the second delay line, and the second delay line is used to control the second explosive to blast in a "V" shape from the second blasting hole toward the edges on both sides of the ore area.

[0011] In this embodiment, the ore area is blasted by "V"-shaped hole-by-hole blasting, which can greatly reduce the large block rate, improve the blasting effect, and concentrate the blast pile after blasting, which is convenient for later removal.

[0012] In some embodiments, the first explosive and the second explosive are both the emulsion explosive.

[0013] In this embodiment, the emulsion explosive can reduce the effects of blasting vibration and shock waves on surrounding rocks, making the fracture spread more evenly, reducing the tilt and cracks of the rock, and making it easier to shovel in the mine.

[0014] In some embodiments, the hole depth of the empty hole network is 2 / 3 of the hole depth of the first blasting hole network or the second blasting hole network.

[0015] In this embodiment, by setting the hole depth of the empty hole network to 2 / 3 of the hole depth of the first blasting hole network or the second blasting hole network, the stress waves generated during the explosion of the first blasting hole network and the second blasting hole network can be effectively reflected and concentrated, so that the blasting energy can be used to the maximum extent for rock fracture, thereby improving the blasting efficiency.

[0016] In some embodiments, the blasthole openings of the first blasting hole network and the second blasting hole network are filled with rock powder.

[0017] In this embodiment, by filling the blasthole opening with rock powder, not only can the energy utilization of the explosives be improved and the size distribution of the rock blocks after blasting be optimized, but also the flying rocks and noise generated by the explosion of the explosives can be reduced, thereby improving the safety of the blasting operation.

[0018] In some embodiments, the diameter of the empty holes in the empty hole network is the same as the diameter of the blast holes in the first blasting hole network or the second blasting hole network.

[0019] In this embodiment, the empty hole network, the first blasting hole network, and the second blasting hole network with the same hole diameter can ensure that the explosion energy is evenly distributed in the rock, thereby improving the blasting efficiency.

[0020] In some embodiments, the empty hole network is arranged on a side of the interface close to the rock area.

[0021] In some embodiments, the first blasting hole network and the second blasting hole network are both spaced apart from the empty hole network.

[0022] In this embodiment, by connecting the blast holes of the first blasting hole network and the second blasting hole network on both sides with the empty hole network, it is possible to prevent excessive concentration of blasting power of the first blasting hole network and the second blasting hole network during the blasting process, thereby avoiding excessive crushing of rocks.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings used in this application. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0025] Figure 1 This is a structural diagram of a blasting hole network structure in an embodiment of the present application;

[0026] Figure 2 This is a cross-sectional schematic diagram of a blasting hole network structure in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. Rock area; 2. Ore area; 3. Interface;

[0029] 4. First blasting hole network; 41. First initiation hole; 42. First delayed blasting hole;

[0030] 5. Second blasting hole network; 51. Second initiation hole; 52. Second delayed blasting hole;

[0031] 6. Hollow mesh; 7. Rock powder. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application 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 on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0040] Failure to effectively control the separation of ore and rock during open-pit blasting can negatively impact mining operations in several ways. First, conventional blasting or large-scale, micro-differential blasting can result in the mixing of ore and waste rock, increasing the difficulty and cost of subsequent beneficiation and processing. This mixing not only affects ore grade but also wastes resources during the beneficiation process. Second, when ore and rock properties vary significantly, inadequate control can lead to poor blasting results, potentially resulting in over- or under-blasting. Over-blasting can disrupt the ore and rock structure, causing damage to the geological environment and increasing safety hazards; under-blasting can result in excessively large ore and rock fragments, increasing the difficulty and cost of subsequent mechanical crushing and transportation. Furthermore, mixed rock can affect production efficiency and reduce the mine's economic benefits. Therefore, effective ore and rock separation blasting in open-pit blasting is a crucial means of improving resource utilization, minimizing environmental damage, and enhancing economic efficiency.

[0041] In order to solve the problem of how to provide a blasting hole network structure to achieve the technical effect of reasonably separating ore and rock in open-pit blasting operations, the present application provides a blasting hole network structure, which can form two independent ore blasting piles and rock blasting piles after blasting through an empty hole network 6 and two independent first blasting hole networks 4 and a second blasting hole network 5, thereby achieving the technical effect of improving mine shoveling efficiency and increasing overall economic benefits.

[0042] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a blasting hole network structure provided in an embodiment of the application. The blasting hole network structure is arranged in the blasting area. The blasting area includes a rock area 1, an ore area 2, and an interface 3 at the junction of the ore area 2 and the rock area 1. The blasting hole network structure includes a first blasting hole network 4, a second blasting hole network 5 and an empty hole network 6. The first blasting hole network 4 is arranged in the rock area 1, the second blasting hole is arranged in the ore area 2, and the empty hole network 6 is arranged along the interface 3.

[0043] Specifically, during the blasting process, the first blasting hole network 4 and the second blasting hole network 5 are controlled to be detonated in the rock area 1 and the ore area 2 respectively according to the timing. After the blasting, two separate ore blasting piles and rock blasting piles are formed in the rock area 1 and the ore area 2, which greatly facilitates mine shoveling, improves mine shoveling efficiency, and increases overall economic benefits. Secondly, in this embodiment, an empty hole network 6 is provided in the ore-rock interface 3 area. During blasting, after the explosion stress waves on both sides are transmitted to the empty hole network 6, the energy will be absorbed by the empty holes, which can greatly reduce the propagation intensity of the explosion wave and reduce the influence of the blasting vibration on the rock at the ore-rock interface 3, thereby controlling the mixing of ore and rock and reducing the depletion rate during the blasting process.

[0044] Furthermore, in the embodiment of the present application, the density of the empty hole network 6 is greater than the density of the second blasting hole network 5, which is greater than the density of the first blasting hole network 4. Specifically, in this embodiment, by providing a high density of empty holes in the ore-rock interface 3, the energy generated by the explosion of the blasting hole networks on both sides can be more fully absorbed during the blasting process, thereby further reducing the depletion rate during the blasting process. Secondly, in this embodiment, the density of the second blasting hole network 5 is greater than the density of the first blasting hole network 4, so that the blockiness of the rock area 1 after blasting is significantly greater than that of the ore area 2, thereby forming two obvious blast piles at the site after blasting.

[0045] Furthermore, in an embodiment of the present application, the first blasting hole network 4 includes a first detonating hole 41, a first delayed blasting hole 42, a first explosive and a first delay line. The first detonating hole 41 is arranged at the edge of the rock area 1 away from the interface 3, and the first delayed blasting holes 42 are arranged in an array form in the rock area 1. The first explosive is provided in the first detonating hole 41 and the first delayed blasting hole 42. The first explosive in the first detonating hole 41 and the first delayed blasting hole 42 is connected by a first extension line. The first extension line is used to control the first explosive to be detonated hole by hole from the first detonating hole 41 toward the direction close to the interface 3.

[0046] Specifically, in this embodiment, the first explosive in the first blasting hole 41 and the first delayed blasting hole 42 is controlled by the first delay line to adopt a hole-by-hole detonation method, and the first blasting hole 41 and the first delayed blasting hole 42 in the rock area 1 are detonated in chronological order. In this process, the first blasting hole can create more free surfaces for the subsequent blasting holes, and the blasting stress wave is reflected more fully, thereby achieving the superposition effect of fully utilizing the energy of the explosives, more fully breaking the rocks in the rock area 1, and thus making it more convenient for mine shoveling and improving the efficiency of mine shoveling.

[0047] Furthermore, in an embodiment of the present application, the second blasting hole network 5 includes a second blasting hole 51, a second delayed blasting hole 52, a second explosive and a second delay line. The second extended blasting holes are evenly arranged in an array in the ore area 2, the second blasting hole 51 is arranged in the middle position of the ore area 2, and second explosives are set in the second blasting hole 51 and the second extended blasting hole. The second explosives in the second blasting hole 51 and the second delayed blasting hole 52 are connected by a second delay line. The second delay line is used to control the second explosive to blast in a "V" shape from the second blasting hole 51 toward the edge direction on both sides of the ore area 2.

[0048] Specifically, in this embodiment, the second explosive in the second blasting hole 51 and the second delayed blasting hole 52 is controlled by the second delay line to blast in a "V" shape from the second blasting hole 51 to both sides of the rock area 1, which can greatly reduce the large block rate, improve the blasting effect, and concentrate the explosive pile after blasting, which is convenient for later removal.

[0049] Furthermore, in the embodiment of the present application, both the first and second explosives are emulsion explosives. During the blasting process of the first and second blasting hole patterns 4 and 5, the emulsion explosives can reduce the effects of blasting vibrations and shock waves on the surrounding rock, making fractures more evenly distributed and reducing rock tilt and cracking, thereby facilitating mining shovel loading.

[0050] For further information, please refer to Figure 2 In the embodiment of the present application, the hole depth of the empty hole mesh 6 is 2 / 3 of the hole depth of the first blasting hole mesh 4 or the second blasting hole mesh 5. By setting the hole depth of the empty hole mesh 6 to 2 / 3 of the hole depth of the first blasting hole mesh 4 or the second blasting hole mesh 5, the stress waves generated during the explosion of the first blasting hole mesh 4 and the second blasting hole mesh 5 can be effectively reflected and concentrated, so that the blasting energy is maximized for rock fracture, thereby improving blasting efficiency.

[0051] Furthermore, in the embodiment of the present application, the blast hole openings of the first blast hole network 4 and the second blast hole network 5 are filled with rock powder 7. In this embodiment, by filling the blast hole openings with rock powder 7, not only can the energy utilization rate of the explosives be improved and the size distribution of the rock blocks after blasting be optimized, but also the flying rocks and noise generated by the explosion of the explosives can be reduced, thereby improving the safety of the blasting operation.

[0052] Furthermore, in the embodiment of the present application, the diameter of the holes in the hollow hole network 6 is the same as the diameter of the blast holes in the first blasting hole network 4 or the second blasting hole network 5. By having the hollow hole network 6, the first blasting hole network 4, and the second blasting hole network 5 with the same hole diameter, it is possible to ensure that the explosive energy is evenly distributed in the rock, thereby improving the blasting efficiency.

[0053] Furthermore, in the embodiment of the present application, the empty hole network 6 is arranged on the side of the interface close to the rock area 1.

[0054] Furthermore, in the embodiment of the present application, the first blasting hole network 4 and the second blasting hole network 5 are both spaced apart from the empty hole network 6. In this embodiment, by indirecting the blast holes of the first blasting hole network 4 and the second blasting hole network 5 on both sides with the empty hole network 6, it is possible to prevent the excessive concentration of blasting power of the first blasting hole network 4 and the second blasting hole network 5 during the blasting process, thereby avoiding excessive crushing of the rock.

[0055] Furthermore, in the embodiment of the present application, a method for setting the spacing between empty holes and the spacing between empty holes and each blast hole of the first blasting hole network 4 and the second blasting hole network 5 is also provided.

[0056] Specifically, the design of the hole spacing (hole spacing) is mainly calculated based on the compression model of thick-walled cylinders in elastic mechanics. The specific calculation is as follows:

[0057] Assuming that the borehole diameter is R and the pressure generated by the explosion products is p, a uniform stress field is generated around the borehole due to the expansion of the explosion products. The radial stress and tangential stress of the stress field are σ respectively. r , σ θ ,

[0058]

[0059] Where R is the radius of the blast hole and r is the distance between the stress analysis point and the center of the hole.

[0060] When σ θ When the dynamic tensile strength of the rock is exceeded, the rock will show a crack. θ When it is less than or equal to the dynamic tensile strength of the rock, the crack will stop developing, and the initial crack radius r0 in the blasthole is:

[0061]

[0062] Among them, [σ td ] is the dynamic tensile strength of rock.

[0063] After the initial crack is formed, the necessary conditions for further crack expansion under the action of static pressure p1 and for the crack to penetrate and form a crack are:

[0064] p1·2R=(S-2r0)[σ t ]

[0065] Combined with the above formula, it can be seen that considering the deviation of on-site construction and the unevenness of rock properties, it is necessary to appropriately increase the density of blastholes and assign a security coefficient. The empty hole spacing s is:

[0066]

[0067] Where p1-static pressure in the blast hole, p1=K f P′1;

[0068] P′1-explosion gas expansion pressure, MPa;

[0069] K f Pressure increase coefficient, 1.1 to 1.5;

[0070] K-safety coefficient, generally 1.1 to 1.3

[0071] [σ t ]-Rock tensile strength, MPa.

[0072] The tensile strength of general weakly weathered rocks is t Between 5 and 6 MPa, dynamic tensile strength σ tdThe density of mixed emulsion explosives is generally 1.12 g / cm3, the detonation velocity is generally greater than 3500 m / s, and the adiabatic isentropic index K of explosives is s Generally, it is 3 to 4. The expansion pressure of explosive gas in weak rock formations is P'1, which is mostly 75 MPa. The pressure increase caused by the high-speed collision of explosive gas particles against the hole wall is P'2, which is 45 MPa.

[0073] Then the comprehensive pressure acting on the hole wall is P′=45+75=120MPa;

[0074] P=K f *P′=1.2*120=144Mpa;

[0075] P1=K f *P′1=1.2*75=90MPa;

[0076] From this calculation, the hole spacing s is:

[0077] s=(2*4.06*0.0675+2*90*0.0675 / 6) / 1.2=2.0m

[0078] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A blasting hole network structure arranged in a blasting area, wherein the blasting area includes a rock area, an ore area, and an interface between the ore area and the rock area, characterized in that: It comprises a first blasting hole network, a second blasting hole network and an empty hole network, wherein the first blasting hole network is arranged in the rock area, the second blasting holes are arranged in the ore area, and the empty hole network is arranged along the interface direction.

2. The blasting hole network structure according to claim 1, characterized in that: The density of the empty hole network is greater than the density of the second blasting hole network, which is greater than the density of the first blasting hole network.

3. The blasting hole network structure according to claim 1, characterized in that: The first blasting hole network includes a first detonation hole, a first delayed blasting hole, a first explosive and a first delay line. The first detonation hole is arranged at the edge of the rock area away from the interface. The first delayed blasting holes are arranged in an array form in the rock area. The first explosive is provided in both the first detonation hole and the first delayed blasting hole. The first explosive in the first detonation hole and the first delayed blasting hole is connected by the first extension line. The first extension line is used to control the first explosive to be detonated hole by hole from the first detonation hole toward the direction close to the interface.

4. The blasting hole network structure according to claim 3, characterized in that: The second blasting hole network includes a second blasting hole, a second delayed blasting hole, a second explosive and a second delay line. The second extended blasting holes are evenly arranged in an array in the ore area. The second blasting hole is arranged in the middle of the ore area. The second explosive is set in the second blasting hole and the second extended blasting hole. The second explosive in the second blasting hole and the second delayed blasting hole is connected by the second delay line. The second delay line is used to control the second explosive to blast in a "V" shape from the second blasting hole toward the edges on both sides of the ore area.

5. The blasting hole network structure according to claim 4, characterized in that: The first explosive and the second explosive are both emulsion explosives.

6. The blasting hole network structure according to claim 1, characterized in that: The hole depth of the empty hole network is 2 / 3 of the hole depth of the first blasting hole network or the second blasting hole network.

7. The blasting hole network structure according to claim 1, characterized in that: The blasthole openings of the first blasting hole network and the second blasting hole network are both filled with rock powder.

8. The blasting hole network structure according to claim 1, characterized in that: The diameter of the empty holes in the empty hole network is the same as the diameter of the blast holes in the first blasting hole network or the second blasting hole network.

9. The blasting hole network structure according to claim 1, characterized in that: The empty hole network is arranged on a side of the interface close to the rock area.

10. The blasting hole network structure according to claim 1, characterized in that: The first blasting hole network and the second blasting hole network are both spaced apart from the empty hole network.

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