Method for improving upward fan-shaped deep hole blasting quality

Abstract

The invention discloses a method for improving upward fan-shaped deep hole blasting quality, and belongs to the technical field of fan-shaped deep hole blasting of underground metal mines. The method for improving the upward fan-shaped deep hole blasting quality comprises the steps that blast hole deflection measurement is conducted, specifically, after perforation is completed, the deflection angle and the deflection length of a single-row fan-shaped blast hole are measured through a hole measuring instrument, and a single-row fan-shaped blast hole deflection schematic diagram is drawn; the detonation mode of the middle blast holes is determined, and the number of the middle blast holes which are firstly detonated by the single-row fan-shaped blast holes is determined; determining blasting modes of the blast holes in the two sides and executing blasting operation. According to the method, the problems of high blasting boulder rate, poor blasting effect and low shoveling efficiency in the prior art when blast hole deflection exists in the fan-shaped deep hole of the underground mine are solved. According to the method, based on the deflection angle and the deflection length of the blast hole, the problem that the blasting boulder rate of the fan-shaped deep hole is high due to deflection of the blast hole is solved by adjusting different blasting modes of the blast hole.

Description

Technical Field

[0001] The invention relates to the technical field of fan-shaped deep hole blasting in underground metal mines, in particular to a method for improving the quality of upward fan-shaped deep hole blasting. Background Art

[0002] In the mining of underground metal mines in my country, the segmented empty field and subsequent filling method is currently widely used for mining, and the segment height is generally 15m to 25m. When using this mining method, each segment is mined by the fan-shaped deep hole blasting method, and the detonation method is generally from the middle to the two sides, and the blastholes at the same position on both sides are detonated in the same section. However, due to the hard rock of metal mines, it is difficult for rock drills to drill holes. The drill bit is prone to deflection during the drilling process, resulting in the deviation of the blasthole trajectory; and the larger the design angle and length of the blasthole, the greater the possibility and degree of deflection, so the fan-shaped middle blasthole is the most seriously deflected. After the blasthole angle deflects, the distance from the bottom of the adjacent blasthole changes, resulting in uneven distribution of explosive explosion energy, resulting in insufficient destruction of the ore (rock) body between some holes, resulting in a high rate of large blast piles, affecting the blasting quality and shoveling efficiency.

[0003] In response to the problem of high blasting block rate due to blasthole deflection, scholars have also proposed some solutions. The Chinese patent with announcement number CN108709467A provides a method of fine blasting with downward fan-shaped deep holes instead of vertical deep holes. The degree of blasthole deflection is reduced by increasing the diameter of the blasthole, adding a stabilizer, and using a deflectometer and a rangefinder. However, this method increases the workload of perforation construction, makes the perforation process cumbersome, and increases potential safety hazards; on the other hand, this method cannot solve the blasting problem of deflected blastholes. Li Yanlong et al. published "Experiment and Application of Upward Fan-shaped Medium-deep Hole Blasting Technology in the Southeast Ore Body of the Chambishi Copper Mine" in the journal "China Nonferrous Metals". Aiming at the problem of deflection during the drilling process of upward fan-shaped medium-deep holes in the southeast ore body of the Chambishi Copper Mine, a special stabilizer for rock drilling was designed and manufactured, and the effectiveness of the stabilizer was proved through multiple verifications. Similarly, the rock drilling stabilizer only solves the problem of blasthole deflection during the drilling process, and cannot solve the problem of deflected blastholes that have been drilled.

[0004] At present, most of the solutions to the problem of blasthole deviation are to improve the drilling quality by increasing the blasthole diameter, measuring the blasthole angle and length during the drilling process, using a stabilizer, etc. These methods are all to improve the drilling quality before and during the drilling process, and ignore the blasting problem of the deviated blasthole that has been drilled. Therefore, the present invention proposes a method for improving the blasting quality of upward fan-shaped deep holes, which can adjust the detonation mode based on the blasthole deviation angle and deviation length, and improve the blasting quality of upward fan-shaped deep holes. Summary of the invention

[0005] The purpose of the present invention is to provide a method for improving the quality of upward fan-shaped deep hole blasting. Based on the blasthole deflection angle and deflection length, by adjusting different blasting methods of the blasthole, the problem of high blasting rate of large blocks in the fan-shaped deep hole due to the blasthole deflection is solved. The operation is simple and the deflected blasthole formed by the perforation is not wasted. The blasting quality and shoveling efficiency of the upward fan-shaped deep hole are improved. The method can be widely used in underground mine fan-shaped deep hole blasting, and the problems raised in the above-mentioned background technology are solved.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for improving the quality of upward fan-shaped deep hole blasting, comprising the following steps:

[0008] S1. Measurement of blasthole deflection: After the perforation is completed, the deflection angle and deflection length of the single-row fan-shaped blastholes are measured using a hole measuring instrument, and a schematic diagram of the deflection of the single-row fan-shaped blastholes is drawn;

[0009] S2. Determination of the detonation method of the middle blastholes: Determine the number of middle blastholes to be detonated first in a single row of fan-shaped blastholes, as follows:

[0010] S21. When the number of single-row fan-shaped blastholes is an odd number, the central area is set to contain a central blasthole, and the two adjacent blastholes outside the central blasthole are set as the left secondary middle hole and the right secondary middle hole. The adjacent blastholes outside the left secondary middle hole and the right secondary middle hole are the left secondary middle hole and the right secondary middle hole, respectively. There are three detonation modes as follows:

[0011] Method 1: If the maximum deflection angles of the central blast hole, the left secondary blast hole and the right secondary blast hole are all less than 3°, the central blast hole will be detonated first, that is, a total of one blast hole will be detonated first;

[0012] Method 2: If the maximum deflection angle of any of the central blasthole, the left secondary middle hole and the right secondary middle hole is 3° to 5°, and the maximum deflection length does not exceed 10m to 12m, then the central blasthole, the left secondary middle hole and the right secondary middle hole are detonated simultaneously, that is, a total of 3 blastholes are detonated simultaneously;

[0013] Method 3: If the maximum deflection angle of any of the central blasthole, the left secondary middle hole and the right secondary middle hole is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the central blasthole, the left secondary middle hole, the right secondary middle hole, the left secondary middle hole and the right secondary middle hole are detonated simultaneously, that is, a total of 5 blastholes are detonated simultaneously;

[0014] S22. When the number of single-row fan-shaped blastholes is an even number, the central area is set to include two blastholes, the left middle hole and the right middle hole; the two adjacent blastholes outside the left middle hole and the right middle hole are respectively the left adjacent hole and the right adjacent hole, and the two adjacent blastholes outside the left adjacent hole and the right adjacent hole are respectively the left second adjacent hole and the right second adjacent hole, and the detonation is divided into the following three modes:

[0015] Method 4: If the maximum deflection angles of the left center hole and the right center hole are both less than 3°, the left center hole and the right center hole will be detonated simultaneously, that is, a total of 2 blastholes will be detonated simultaneously;

[0016] Method 5: If the maximum deflection angle of any blasthole in the left middle hole and the right middle hole is 3° to 5° and the maximum deflection length does not exceed 10m to 12m, the left middle hole, the right middle hole, the left adjacent hole and the right adjacent hole are detonated simultaneously, that is, a total of 4 blastholes are detonated simultaneously;

[0017] Method 6: If the maximum deflection angle of any blasthole in the left middle hole and the right middle hole is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the left middle hole, the right middle hole, the left adjacent hole, the right adjacent hole, the left second adjacent hole and the right second adjacent hole are detonated simultaneously, that is, a total of 6 holes are detonated simultaneously;

[0018] S3. Determination of the detonation method of the blastholes on both sides: Except for the middle blasthole that is detonated first, the rest are the blastholes on both sides. According to the deflection angle of the blastholes on both sides, there are two detonation methods:

[0019] If the deflection angle of one or two of the two symmetrical blastholes exceeds 3°, the two blastholes shall be detonated at the same stage as the adjacent blasthole on the same side, that is, a total of two blastholes shall be detonated at the same time;

[0020] If the blasthole deflection angle does not exceed 3°, the blasthole will be detonated at the same stage as another blasthole in the symmetrical position, that is, a total of two blastholes will be detonated at the same time;

[0021] S4, blasting operation execution: charge and fill the blast holes, carry out segmented blasting according to the detonation method determined by S2 and S3, and determine the delay interval between segments according to the detonation method of the middle blast hole.

[0022] Preferably, the single row of fan-shaped blast holes are symmetrically distributed, and when the number of fan-shaped blast holes is an odd number, the angle of the central blast hole is 90°.

[0023] Preferably, the diameter of the blasthole is in the range of Φ60mm to 100mm, and the length of the blasthole does not exceed 25m.

[0024] Preferably, with respect to S4, the delay interval setting method is specifically as follows:

[0025] If method 1 or method 4 is used for detonation, the delay interval of different sections is set to 50ms~100ms;

[0026] If the detonation method 2 or 5 is adopted, the delay interval of different sections is set to 100ms~150ms;

[0027] If method three or method six is ​​used for detonation, the delay intervals of different sections are set to 150ms~200ms.

[0028] Preferably, the method is applicable to the technical field of fan-shaped deep hole blasting in underground metal mines, and in particular to dealing with blasting quality problems caused by blast hole deviation.

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

[0030] 1. The present invention adjusts the detonation mode according to the deviation of the blasthole, and increases the superposition effect of blasting stress waves and the probability of collision of ore (rock) bodies by setting the mode of simultaneous detonation of adjacent blastholes, thereby significantly reducing the rate of blasting large blocks, improving the blasting quality, and improving the shoveling efficiency. It is found through on-site statistics that the rate of blasting large blocks is reduced by 25% to 45%, and the shoveling efficiency is improved by more than 50%.

[0031] 2. The present invention adopts a method of adjusting the detonation mode to effectively utilize the formed deviated blastholes, reduce the cost of re-drilling, and improve the efficiency of the blasting operation.

[0032] 3. The present invention improves the blasting quality by adjusting the detonation mode after perforation, thereby eliminating the processes of stabilizing the rod and measuring the inclination during the perforation process, reducing the workload of perforation, and reducing the potential safety hazards caused by stabilizing the rod and measuring the hole during the perforation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of blasthole deflection of an 11-hole embodiment of the present invention;

[0034] Figure 2 Schematic diagram of blast hole deflection of a 10-hole embodiment of the present invention.

[0035] Figure 1 Middle: A1, center blast hole; A21, left secondary center blast hole; A22, right secondary center blast hole; A31, left secondary center blast hole; A32, right secondary center blast hole; A41, left third oblique blast hole; A42, right third oblique blast hole; A51, left fourth oblique blast hole; A52, right fourth oblique blast hole; A61, left fifth oblique blast hole; A62, right fifth oblique blast hole;

[0036] α, blasthole deflection angle; X, blasthole deflection length;

[0037] A1' represents the original blast hole trajectory of A1, A21' represents the original blast hole trajectory of A21, A22' represents the original blast hole trajectory of A22, and so on;

[0038] Figure 2Middle: B11, left middle hole; B12, right middle hole; B21, left adjacent hole; B22, right adjacent hole; B31, left second adjacent hole; B32, right second adjacent hole; B41, left third adjacent blasthole; B42, right third adjacent blasthole; B51, left fourth adjacent blasthole; B52, right fourth adjacent blasthole;

[0039] B11' represents the original blast hole trajectory of B11, B12' represents the original blast hole trajectory of B12, B21' represents the original blast hole trajectory of B21, and so on. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] When there is a blasthole deviation in the fan-shaped deep hole of an underground mine, the existing technology has a high rate of large blasting blocks, poor blasting effect, and low shoveling efficiency. In order to solve the above problems, this embodiment provides the following technical solutions:

[0042] For a better understanding, here is a Figure 1 The example shown has 11 holes (odd number) in the fan-shaped blast hole number, and an example Figure 2 The number of fan-shaped blast holes shown is an example of 10 holes (an even number), and each blast hole is specifically numbered. Figure 1 and Figure 2 The solid line in the middle represents the original trajectory of the blasthole, and the dotted line represents the deflected trajectory after the blasthole is drilled; the actual number of blastholes is set according to the production situation of the mine, and the implementation of the present invention has different requirements only according to the odd and even numbers of the fan-shaped holes, and there is no limit on the actual number of fan-shaped holes.

[0043] A method for improving the quality of upward fan-shaped deep hole blasting, comprising the following steps:

[0044] S1. After the blastholes are perforated, the skew angle and skew length of the single-row fan-shaped blastholes are measured with a hole measuring instrument, and a single-row fan-shaped blasthole deflection schematic diagram is drawn. This step ensures that the subsequent detonation scheme design is based on actual data and improves accuracy;

[0045] See also Figure 1 The blasthole deflection angle is the angle of the line connecting the bottom of the blasthole and the position where the blasthole starts to deflect, which is deflected from the designed blasthole direction; the blasthole deflection length is the straight-line distance from the position where the blasthole starts to deflect to the bottom of the blasthole;

[0046] The detonation mode is determined according to the deflection angle and deflection length of the middle blasthole. The basic principle is that when the deflection angle and deflection length of the blasthole are larger, the bottom distance of adjacent blastholes will be larger, which will cause uneven distribution of explosive energy and lead to the local appearance of large pieces. At this time, different detonation modes of simultaneously detonating one or more adjacent blastholes can be selected to increase the superposition effect of blasting stress waves of adjacent blastholes and the probability of collision of ore (rock) bodies between blastholes, thereby achieving the purpose of reducing the rate of blasting large pieces.

[0047] S2. Determination of the detonation method of the middle blastholes: Determine the number of middle blastholes to be detonated first in a single row of fan-shaped blastholes, as follows:

[0048] S21. When the number of single-row fan-shaped blastholes is an odd number, the central area is set to contain a central blasthole A1, and the two adjacent blastholes outside the central blasthole A1 are set as the left secondary middle hole A21 and the right secondary middle hole A22. The blastholes adjacent to the left secondary middle hole A21 and the right secondary middle hole A22 are the left secondary middle hole A31 and the right secondary middle hole A32 respectively. There are three detonation modes as follows:

[0049] Method 1: If the maximum deflection angles of the central blast hole A1, the left secondary blast hole A21 and the right secondary blast hole A22 are all less than 3°, the central blast hole A1 will be detonated first, that is, a total of one blast hole will be detonated first;

[0050] Method 2: If the maximum deflection angle of any of the central blasthole A1, the left secondary middle hole A21 and the right secondary middle hole A22 is 3° to 5°, and the maximum deflection length does not exceed 10m to 12m, then the central blasthole A1, the left secondary middle hole A21 and the right secondary middle hole A22 are detonated simultaneously, that is, a total of 3 blastholes are detonated simultaneously;

[0051] Method 3: If the maximum deflection angle of any of the central blasthole A1, the left secondary middle hole A21 and the right secondary middle hole A22 is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the central blasthole A1, the left secondary middle hole A21, the right secondary middle hole A22, the left secondary middle hole A31 and the right secondary middle hole A32 are detonated simultaneously, that is, a total of 5 blastholes are detonated simultaneously;

[0052] The details are shown in Table 1:

[0053]

[0054] Table 1 Classification of detonation methods for the middle blastholes in a single row with an odd number of blastholes

[0055] S22. When the number of single-row fan-shaped blastholes is an even number, the central area is set to include two blastholes, the left middle hole B11 and the right middle hole B12; the two adjacent blastholes outside the left middle hole B11 and the right middle hole B12 are the left adjacent hole B21 and the right adjacent hole B22, and the two adjacent blastholes outside the left adjacent hole B21 and the right adjacent hole B22 are the left second adjacent hole B31 and the right second adjacent hole B32, which are divided into the following three detonation modes:

[0056] Method 4: If the maximum deflection angles of the left center hole B11 and the right center hole B12 are both less than 3°, the left center hole B11 and the right center hole B12 are detonated simultaneously, that is, a total of two blastholes are detonated simultaneously;

[0057] Method 5: If the maximum deflection angle of any blasthole among the left middle hole B11 and the right middle hole B12 is 3° to 5° and the maximum deflection length does not exceed 10m to 12m, the left middle hole B11, the right middle hole B12, the left adjacent hole B21 and the right adjacent hole B22 are detonated simultaneously, that is, a total of 4 blastholes are detonated simultaneously;

[0058] Method 6: If the maximum deflection angle of any blasthole among the left middle hole B11 and the right middle hole B12 is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the left middle hole B11, the right middle hole B12, the left adjacent hole B21, the right adjacent hole B22, the left next adjacent hole B31 and the right next adjacent hole B32 are detonated simultaneously, that is, a total of 6 holes are detonated simultaneously;

[0059] The details are shown in Table 2:

[0060]

[0061]

[0062] Table 2 Classification of detonation methods for even-numbered middle holes in a single row of blastholes

[0063] S3. Determination of the detonation method of the blastholes on both sides: Except for the middle blasthole that is detonated first, the rest are the blastholes on both sides. According to the deflection angle of the blastholes on both sides, there are two detonation methods:

[0064] If the deflection angle of one or two of the two symmetrical blastholes exceeds 3°, the two blastholes shall be detonated at the same stage as the adjacent blasthole on the same side, that is, a total of two blastholes shall be detonated at the same time;

[0065] If the blasthole deflection angle does not exceed 3°, the blasthole will be detonated at the same stage as another blasthole in the symmetrical position, that is, a total of two blastholes will be detonated at the same time;

[0066] S4, blasting operation execution: charge and fill the blastholes, perform segmented blasting according to the detonation method determined in S2 and S3, determine the delay interval between segments according to the detonation method of the middle blasthole, and the specific delay interval setting method is:

[0067] If method 1 or method 4 is used for detonation, the delay interval of different sections is set to 50ms~100ms;

[0068] If the detonation method 2 or 5 is adopted, the delay interval of different sections is set to 100ms~150ms;

[0069] If method three or method six is ​​used for detonation, the delay intervals of different sections are set to 150ms~200ms.

[0070] The basic principle of the appropriate delay interval in step S4 is that when the number of blast holes that are first detonated simultaneously in the middle of the sector increases, a larger delay interval should be selected to prevent the blast holes that are first detonated in the middle of the sector from overlapping with the blasting stress waves of adjacent segments.

[0071] The single row of fan-shaped blast holes are symmetrically distributed. When the number of fan-shaped blast holes is an odd number, the angle of the center blast hole A1 is 90°.

[0072] The length of the blasthole shall not exceed 25m, and the diameter of the blasthole shall be within the range of Φ60mm to 100mm. The minimum blasthole diameter is 60mm so that the borehole measuring instrument can smoothly enter the blasthole. The maximum blasthole diameter is 100mm in order to control the charge amount of a single hole.

[0073] Working principle: After the drilling is completed, the borehole measuring instrument is used to accurately measure the deflection angle and length of the single-row fan-shaped blastholes, and a schematic diagram of the blasthole deflection is drawn; based on the measured deflection angle and length, the detonation method of the middle blasthole is determined. When the degree of deflection is small, the blastholes in the central area and a small number of adjacent blastholes are detonated first; as the deflection angle and length increase, more adjacent blastholes are detonated at the same time to enhance the superposition effect of the blasting stress wave and the probability of ore (rock) collision, thereby reducing the rate of large blasting blocks; for the blastholes on both sides, if the deflection angle is small, they are detonated at the same section as the symmetrically located blastholes; if the deflection angle is large, they are detonated at the same section as the adjacent blastholes. This strategy aims to ensure uniform energy distribution and reduce the possibility of local large blocks; according to different detonation methods, the delay intervals between different segments are reasonably set to prevent too many blast holes from being detonated at the same time, causing stress wave superposition and affecting the blasting effect; all blast holes are loaded and filled according to design requirements, and then networked detonation is carried out according to the above-determined detonation method to complete the blasting operation of a single row of fan-shaped holes.

[0074] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0075] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for improving the quality of upward fan-shaped deep hole blasting, characterized in that: The following steps are involved: S1. Measurement of blasthole deflection: After the perforation is completed, the deflection angle and deflection length of the single-row fan-shaped blastholes are measured using a hole measuring instrument, and a schematic diagram of the deflection of the single-row fan-shaped blastholes is drawn; S2. Determination of the detonation method of the middle blastholes: Determine the number of middle blastholes to be detonated first in a single row of fan-shaped blastholes, as follows: S21. When the number of single-row fan-shaped blastholes is an odd number, the central area is set to contain a central blasthole (A1), and the two adjacent blastholes outside the central blasthole (A1) are set as the left secondary middle hole (A21) and the right secondary middle hole (A22), and the adjacent blastholes outside the left secondary middle hole (A21) and the right secondary middle hole (A22) are respectively the left secondary middle hole (A31) and the right secondary middle hole (A32), and the detonation methods are divided into the following three modes: Method 1: If the maximum deflection angles of the central blast hole (A1), the left secondary middle hole (A21) and the right secondary middle hole (A22) are all less than 3°, the central blast hole (A1) will be detonated first, that is, a total of one blast hole will be detonated first; Method 2: If the maximum deflection angle of any of the central blasthole (A1), the left secondary middle hole (A21) and the right secondary middle hole (A22) is 3° to 5°, and the maximum deflection length does not exceed 10m to 12m, then the central blasthole (A1), the left secondary middle hole (A21) and the right secondary middle hole (A22) are detonated simultaneously, that is, a total of three blastholes are detonated simultaneously; Method 3: If the maximum deflection angle of any of the central blasthole (A1), the left secondary middle hole (A21) and the right secondary middle hole (A22) is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the central blasthole (A1), the left secondary middle hole (A21), the right secondary middle hole (A22), the left secondary middle hole (A31) and the right secondary middle hole (A32) are detonated simultaneously, that is, a total of 5 blastholes are detonated simultaneously; S22. When the number of single-row fan-shaped blastholes is an even number, the central area is set to include two blastholes, namely the left middle hole (B11) and the right middle hole (B12); the two adjacent blastholes outside the left middle hole (B11) and the right middle hole (B12) are the left adjacent hole (B21) and the right adjacent hole (B22), respectively; the two adjacent blastholes outside the left adjacent hole (B21) and the right adjacent hole (B22) are the left second adjacent hole (B31) and the right second adjacent hole (B32), respectively. There are three detonation modes as follows: Method 4: If the maximum deflection angles of the left center hole (B11) and the right center hole (B12) are both less than 3°, the left center hole (B11) and the right center hole (B12) are detonated simultaneously, that is, a total of two blastholes are detonated simultaneously; Method 5: If the maximum deflection angle of any blasthole among the left middle hole (B11) and the right middle hole (B12) is 3° to 5° and the maximum deflection length does not exceed 10m to 12m, the left middle hole (B11), the right middle hole (B12), the left adjacent hole (B21) and the right adjacent hole (B22) are detonated simultaneously, that is, a total of 4 blastholes are detonated simultaneously; Method 6: If the maximum deflection angle of any blasthole among the left middle hole (B11) and the right middle hole (B12) is 3° to 5° and the minimum deflection length is greater than 10m to 12m, or the maximum deflection angle is greater than 5°, then the left middle hole (B11), the right middle hole (B12), the left adjacent hole (B21), the right adjacent hole (B22), the left next adjacent hole (B31) and the right next adjacent hole (B32) are detonated simultaneously, that is, a total of 6 holes are detonated simultaneously; S3. Determination of the detonation method of the blastholes on both sides: Except for the middle blasthole that is detonated first, the rest are the blastholes on both sides. According to the deflection angle of the blastholes on both sides, there are two detonation methods: If the deflection angle of one or two of the two symmetrical blastholes exceeds 3°, the two blastholes shall be detonated at the same stage as the adjacent blasthole on the same side, that is, a total of two blastholes shall be detonated at the same time; If the blasthole deflection angle does not exceed 3°, the blasthole will be detonated at the same stage as another blasthole in the symmetrical position, that is, a total of two blastholes will be detonated at the same time; S4, blasting operation execution: charge and fill the blast holes, carry out segmented blasting according to the detonation method determined by S2 and S3, and determine the delay interval between segments according to the detonation method of the middle blast hole.

2. A method for improving the quality of upward fan-shaped deep hole blasting according to claim 1, characterized in that: The single row of fan-shaped blast holes are symmetrically distributed. When the number of fan-shaped blast holes is an odd number, the angle of the central blast hole (A1) is 90°.

3. A method for improving the quality of upward fan-shaped deep hole blasting according to claim 2, characterized in that: The diameter of the blasthole is in the range of Φ60mm to 100mm, and the length of the blasthole does not exceed 25m.

4. A method for improving the quality of upward fan-shaped deep hole blasting according to claim 3, characterized in that: Regarding S4, the delay interval setting method is specifically as follows: If method 1 or method 4 is used for detonation, the delay interval of different sections is set to 50ms~100ms; If the detonation method 2 or 5 is adopted, the delay interval of different sections is set to 100ms~150ms; If method three or method six is ​​used for detonation, the delay intervals of different sections are set to 150ms~200ms.

5. A method for improving the quality of upward fan-shaped deep hole blasting according to claim 4, characterized in that: The method is applicable to the technical field of fan-shaped deep hole blasting in underground metal mines, and is particularly applicable to dealing with blasting quality problems caused by blast hole deviation.

Images