A bench blasting angle bisector hole arrangement method

Abstract

The application discloses a bench blasting angle bisector hole arrangement method and relates to the technical field of blasting hole arrangement. The bench blasting angle bisector hole arrangement method specifically comprises the following steps: determining a bench slope angle, a drilling inclination angle of front row holes, a minimum resistance line length and a bench height according to blasting design; determining a position of the front row blast hole, a demarcation point of a minimum plugging length and a maximum charge length of the front row blast hole by an angle bisector method, with the premise conditions of meeting the minimum resistance line and the plugging distance of the blast hole mouth free surface; and determining the minimum plugging length, the maximum charge length and the eyebrow line distance of the front row blast hole according to the demarcation point of the minimum plugging length and the maximum charge length. The application not only implements the minimum resistance line and the plugging distance into the hole arrangement design, but also limits the minimum plugging length and controls the maximum charge length, so that the safety of the bench blasting hole arrangement design is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast hole drilling, in particular to a step blasting angle bisector hole drilling method. BACKGROUND

[0002] Step blasting refers to a blasting construction operation mode in which a working plane on a step is divided into blasting units by hole and row distance, and a blasting unit is broken by strip explosive in the hole as a power source, and a next blasting free face and working plane are formed after the broken medium is scraped by a shovel, and the step blasting is advanced. The hole plugging distance refers to the shortest distance from the highest charging point to the free face of the hole mouth. The minimum resistance line of the front row of holes and the hole plugging distance are the shortest distances from the two free faces of the highest charging point, and are key parameters of blasting construction. They will directly affect the blasting quality of the slope and the upper plane, and also determine the intrinsic safety of blasting. Therefore, when designing the blasting hole drilling, the design of the two parameters should be particularly careful. The reasonable minimum resistance line and plugging distance can be determined according to the trial blasting and previous blasting experience.

[0003] In the design of blasting hole drilling, the minimum resistance line and the plugging distance should be reasonable. The minimum resistance line and the plugging distance should not be too small, and the plugging distance that is too small is easy to produce harmful phenomena such as blasting punch hole flying stone, blasting shock wave and dust; and the minimum resistance line and the plugging distance should not be too large, and the large minimum resistance line and plugging distance cannot guarantee the breaking of the free face, thereby producing large blocks, root defects at the bottom and other adverse phenomena, causing time loss, affecting progress and increasing comprehensive cost due to secondary processing and breaking, and the comprehensive difficulty of secondary processing is greater.

[0004] In the design of blasting hole drilling, how to reasonably and simply realize the minimum resistance line and the plugging distance of the front row of holes is a problem. The minimum resistance line of the front row of holes is often located inside the rock stratum, so it is difficult to be simply measured and obtained, and is often estimated by experience, so that it cannot be accurately reflected; the plugging length is often the empirical data of the vertical hole, and the conversion of the plugging length for the inclined hole is unknown or directly used, thereby causing blasting quality, safety incidents or accidents. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a step blasting angle bisector hole drilling method, and the position of the front row of holes, the minimum plugging length and the division point of the maximum charging height are determined according to the slope top angle bisector method. The step blasting angle bisector hole drilling method is simple to calculate and convenient to operate, and can improve the intrinsic safety of blasting.

[0006] In order to achieve the above technical purposes, the present application adopts the following technical scheme: a step blasting angle bisector hole drilling method, specifically comprising the following steps:

[0007] Step 1, according to the blasting design, determine the bench slope angle, the drilling inclination angle of the front row hole, the minimum resistance line length and the bench height;

[0008] Step 2, according to the determined bench slope angle, the drilling inclination angle of the front row hole, the minimum resistance line length and the bench height, establish the position of the front row hole of the bench, the demarcation point of the minimum packing length and the maximum charge length of the front row hole by the angle bisector method;

[0009] Step 3, according to the demarcation point of the minimum packing length and the maximum charge length, determine the minimum packing length, the maximum charge length and the eyebrow line distance of the front row hole.

[0010] Further, the specific process of step 2 is: taking the minimum resistance line length of the front row hole as the distance of the parallel line of the bench upper plane, making the angle bisector of the bench slope angle, and taking the intersection point of the parallel line and the angle bisector as the position point of the front row hole. At the same time, the intersection point of the parallel line and the angle bisector is also the demarcation point of the minimum packing length and the maximum charge length of the front row hole.

[0011] Further, the calculation process of the eyebrow line distance of the front row hole is:

[0012] B=wcotθ+wtan(β / 2)

[0013] Wherein, B is the eyebrow line distance of the front row hole, w is the minimum resistance line length of the front row hole, β is the bench slope angle, and θ is the drilling inclination angle of the front row hole.

[0014] Further, according to the position point of the front row hole, the drilling inclination angle of the front row hole and the bench height, determine the total length of the front row hole, take the front row hole length from the position point of the front row hole to the upper plane of the bench as the minimum packing length of the front row hole, and take the front row hole length from the position point of the front row hole to the lower plane of the bench as the maximum charge length of the front row hole.

[0015] Further, the calculation process of the minimum packing length of the front row hole is:

[0016] L1=w / sinθ

[0017] Wherein, L1 is the minimum packing length of the front row hole, w is the minimum resistance line length of the front row hole, and θ is the drilling inclination angle of the front row hole.

[0018] Further, the calculation process of the maximum charge length of the front row hole is:

[0019] L2=(H-w) / sinθ

[0020] Wherein, L2 is the maximum charge length of the front row hole, w is the minimum resistance line length of the front row hole, H is the bench height, and θ is the drilling inclination angle of the front row hole.

[0021] Compared with the prior art, the present application has the following beneficial effects: the minimum resistance line of the front row blast hole is often located in the rock mass and is inconvenient to measure. The bench blasting angle bisector hole arrangement method equalizes the distance from the angle bisector of the slope top angle to the two free surfaces, performs simple calculation, obtains the eyebrow distance of the front row blast hole, and then establishes the position of the front row blast hole through the eyebrow distance of the front row blast hole and the drilling inclination angle, so as to ensure the designed minimum resistance line and facilitate the implementation in the hole arrangement operation. In addition, the bench blasting angle bisector hole arrangement method determines the minimum plug length and the maximum charge length of the front row blast hole. Since the distance from the point on the angle bisector to the two free surfaces is equal, this not only ensures the implementation of the minimum resistance line of the front row blast hole, but also limits the minimum plug length, so as to ensure the minimum filling distance from the highest charge point to the upper free surface, avoid the risk of upward "punching" blasting flyrock, control the highest charge length, and also avoid the risk of blasting flyrock in the direction of the minimum resistance line caused by excessive charge.

[0022] In summary, the bench blasting angle bisector hole arrangement method takes the minimum resistance line and the plug distance as the precondition, and then establishes the blast hole position, the highest charge length and the minimum plug length through simple calculation, so as to reduce the risk of blasting flyrock caused by high charge or small plug, greatly improve the blasting quality and the intrinsic safety of blasting, and reduce the blindness of blasting design and improve the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a flowchart of the bench blasting angle bisector hole arrangement method of the present application.

[0024] Figure 2 The figure is a schematic diagram of the position determination of the front row blast hole in the present application. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be further explained and described in combination with the drawings.

[0026] In the present application, the front row blast hole is not super deep, for example, Figure 1 The figure is a flowchart of the bench blasting angle bisector hole arrangement method of the present application. The bench blasting angle bisector hole arrangement method specifically includes the following steps:

[0027] Step 1: determining the bench slope angle, the drilling inclination angle of the front row hole, the minimum resistance line length and the bench height according to the blasting design.

[0028] Step 2, according to the determined blasting bench slope angle, the drilling angle of the front row hole, the minimum resistance line length and the bench height, the position of the front row hole, the minimum plugging length and the maximum charging length of the front row hole are determined by the angle bisector method. Figure 2 The specific process is as follows: taking the minimum resistance line length of the front row hole as the distance of the parallel line of the bench upper plane, the angle bisector of the bench slope angle is drawn, and the intersection point of the parallel line and the angle bisector is taken as the position point of the front row hole. At the same time, the intersection point of the parallel line and the angle bisector is also the demarcation point of the minimum plugging length and the maximum charging length of the front row hole. Since the minimum resistance line of the front row hole is often located in the rock mass, it is not convenient to measure, the distance of the angle bisector to the two free surfaces is equal, through simple calculation, the eyebrow distance is obtained, and the position of the front row hole is determined by the eyebrow distance and the drilling angle, so as to ensure the designed minimum resistance line, which is convenient to realize in hole arrangement operation. The angle bisector hole arrangement method of the bench blasting has the advantages of simple calculation and convenient operation.

[0029] Step 3, according to the demarcation point of the minimum plugging length and the maximum charging length, the minimum plugging length, the maximum charging length and the eyebrow distance of the front row hole are determined. Since the distance of the point on the angle bisector to the two free surfaces is equal, not only the implementation of the minimum resistance line is ensured, but also the minimum plugging length is limited, so as to ensure the minimum plugging distance from the highest charging point to the upper free surface, avoid the risk of blasting fly rock of "punching hole" upward, control the maximum charging length, and also avoid the risk of blasting fly rock in the direction of the minimum resistance line caused by excessive charge, greatly improve the blasting essential safety and blasting quality, reduce the blindness of blasting design and improve the construction efficiency.

[0030] The calculation process of the eyebrow distance of the front row hole in the application is as follows:

[0031] B=wcotθ+wtan(β / 2)

[0032] Wherein, B is the eyebrow distance of the front row hole, w is the minimum resistance line length of the front row hole, β is the bench slope angle, and θ is the drilling angle of the front row hole.

[0033] According to the position point of the front row hole, the drilling angle of the front row hole and the bench height, the total length of the front row hole is determined, the front row hole length from the position point of the front row hole to the upper plane of the bench is taken as the minimum plugging length of the front row hole, and the front row hole length from the position point of the front row hole to the lower plane of the bench is taken as the maximum charging length of the front row hole. The calculation process of the minimum plugging length of the front row hole in the application is as follows:

[0034] L1=w / sinθ

[0035] Wherein, L1 is the minimum plugging length of the front row hole, w is the minimum resistance line length of the front row hole, and θ is the drilling angle of the front row hole.

[0036] The calculation process of the maximum charge length of the front row blast hole in the application is as follows:

[0037] L2=(H-w) / sinθ

[0038] Wherein, L2 is the maximum charge length of the front row blast hole, w is the minimum resistance line length of the front row blast hole, H is the step height, and θ is the drilling angle of the front row blast hole.

[0039] The step blasting angle bisector hole arrangement method of the application determines the eyebrow line distance, the minimum length of the blockage and the maximum charge length by the intersection method of the slope top angle bisector and the parallel line of the blasting step upper plane, which not only implements the minimum resistance line into the hole arrangement design, but also limits the minimum blockage length and controls the maximum charge height, greatly improving the essential safety of the step blasting hole arrangement design.

[0040] Although the embodiments of the application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the application, and other modifications can be easily realized by those skilled in the art, therefore the application is not limited to the specific details and the specific embodiments shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A method for bench blasting corner bisector hole drilling, characterized in that, Specifically comprising the following steps: Step 1, according to the blasting design to determine the bench slope angle, the drilling inclination angle of the front row of blast holes, the minimum resistance line length and the bench height; Step 2, according to the determined blasting bench slope angle, the drilling inclination angle of the front row of blast holes, the minimum resistance line length and the bench height, the position of the front row of blast holes, the demarcation point of the minimum stemming length and the maximum charge length of the front row of blast holes are established by the angle bisector method, the specific process is: taking the minimum resistance line length of the front row of blast holes as the distance of the parallel line of the bench upper plane, the angle bisector of the bench slope top angle is drawn, the intersection point of the parallel line and the angle bisector is taken as the position point of the front row of blast holes, at the same time, the intersection point of the parallel line and the angle bisector is also the demarcation point of the minimum stemming length and the maximum charge length of the front row of blast holes; Step 3, according to the demarcation point of the minimum stemming length and the maximum charge length, the minimum stemming length, the maximum charge length and the eyebrow line distance of the front row of blast holes are determined, specifically, according to the position point of the front row of blast holes, the drilling inclination angle of the front row of blast holes and the bench height, the total length of the front row of blast holes is determined, the front row of blast holes length from the position point of the front row of blast holes to the bench upper plane is taken as the minimum stemming length of the front row of blast holes, and the front row of blast holes length from the position point of the front row of blast holes to the bench lower plane is taken as the maximum charge length of the front row of blast holes; The calculation process of the eyebrow line distance of the front row of blast holes is: B=wcotθ+wtan(β / 2) Wherein, B is the eyebrow line distance of the front row of blast holes, w is the minimum resistance line length of the front row of blast holes, β is the bench slope angle, θ is the drilling inclination angle of the front row of blast holes; The calculation process of the minimum stemming length of the front row of blast holes is: L1=w / sinθ Wherein, L1 is the minimum stemming length of the front row of blast holes, w is the minimum resistance line length of the front row of blast holes, θ is the drilling inclination angle of the front row of blast holes; The calculation process of the maximum charge length of the front row of blast holes is: L2=(H-w) / sinθ Wherein, L2 is the maximum charge length of the front row of blast holes, w is the minimum resistance line length of the front row of blast holes, H is the bench height, θ is the drilling inclination angle of the front row of blast holes.

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