A method for one-time well construction of high-depth blind shaft

Abstract

The present invention discloses a method for single-shot well completion in a high-depth blind shaft, comprising the following steps: arranging a blasthole structure comprising a cutout area, an expansion ring, and peripheral holes, wherein the cutout area is provided with multiple cutout blasting areas, and the expansion ring is provided with alternately arranged empty holes and expanded holes; positioning the blastholes, adjusting and fixing the drilling angle of the drilling trolley to perform drilling operations, forming parallel blastholes, sequentially packing the charge holes with explosives and spacing detonating warheads at intervals to form a clustered detonation network, with the central cutout hole being detonated first, and the remaining blastholes being detonated simultaneously according to one or two connected charge holes of the same diameter, with the detonation sequence arranged such that the lines connecting two adjacent blastholes form a "cross" or "X" shape, with detonations occurring at intervals of 0.5 seconds until blasting is complete. By employing methods such as empty holes to protect the charge holes, drilling at a fixed angle throughout, spacing detonating warheads within the charge holes, and alternating detonation of adjacent charge holes, the present invention has the advantages of low overall hole deflection, a high success rate for single-shot well completion, and well completion depths of up to 18 meters.

Description

Technical Field

[0001] The invention belongs to the technical field of mine blasting, and in particular relates to a method for forming a high-depth blind shaft in one go. Background Art

[0002] The shaft excavation project is an important part of mine development and mining engineering. Among them, during the vertical shaft excavation process, the formation of the groove area directly determines the success or failure of the single blasting well and the blasting effect. Therefore, it is very important to reasonably select the groove layout form, blasthole arrangement parameters and blasting technology, especially for the formation of high-depth blind shafts using the medium-depth hole single-time well construction method.

[0003] During mine development, depending on the ore vein conditions and production needs, there are cases where the height and depth of a well must exceed 15 meters in one go. The traditional medium-depth hole single-shot drilling method involves arranging several large-diameter holes around a central charging hole. The central hole is first blasted to expand the slot. Then, using micro-difference blasting, staged blasting is carried out from bottom to top, starting with the center hole and then the surrounding holes, forming a tower-shaped blasting pattern until the entire shaft is blasted. This method has improved the success rate of blind well blasting to a certain extent, but there are still many problems, including: (1) the height of a single blast is 1.5-2m, the number of blasting times is large, and a single hole uses many detonators and many sections, which makes it easy to make mistakes in layout. Moreover, if the blasting of individual holes or a certain layer fails during blasting, the blasting of the entire well will fail, and the success rate of one-time blasting is low; (2) the hole spacing is too small, and when the well depth is large, the hole deflection phenomenon is obvious, and the bottom of the hole is easy to be perforated; (3) the adjacent blasting holes are detonated sequentially, the blasting is concentrated, and the detonation wave of the first blasting hole is easy to be transmitted to the surrounding charging holes, causing the surrounding charging holes to be destroyed, and ultimately resulting in the blasting height failing to meet the requirements. Summary of the Invention

[0004] The purpose of the present invention is to propose a method for the one-time completion of a high-depth blind well, so as to solve the problem of low one-time blasting completion rate caused by the problems of insufficient slot hole blasting depth, small blasthole spacing, multiple detonator sections, and large hole deviation rate when using the existing medium-depth hole one-time completion method.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention proposes a method for drilling a high-depth blind well in one go, comprising the following steps:

[0007] S1 Arrange blastholes: Arrange a central slot hole at the center of the blind skylight blasting area, and arrange a circle of empty holes at equal angles around the central slot hole as a slot protection circle. Set a slot circle outside the protection circle, and arrange slot holes and empty holes alternately and equidistantly on the slot circle according to a preset hole spacing. The central slot hole, the protection circle, and the slot circle together constitute a slot area. The slot holes and the empty holes around them form multiple slot blasting areas. Arrange at least one expansion slot circle outside the slot circle, and arrange expansion slot holes and empty holes alternately and equidistantly on the expansion slot circle according to a preset hole spacing. Set a forming ring outside the expansion slot circle, and arrange peripheral holes at equal intervals on the forming ring. The diameter D of the empty holes is 120 mm. The central slot hole, slot hole, expansion slot hole, and peripheral holes are all charging holes. The diameter d of the charging holes is 76 mm. The number of slot holes, expansion slot holes, and peripheral holes is even, and the line connecting two opposite charging holes passes through the center of the circle.

[0008] S2 drilling: The cutting tunnel is cleaned until the bottom of the tunnel is hard, and the top of the tunnel at the planned well working face is sprayed with concrete in full section until the tunnel roof is flat. The opening position of each blasthole in S1 is located using a total station and marked with paint; the drilling trolley angle is adjusted to be vertically upward relative to the cutting tunnel, and the trolley angle is fixed to start drilling. During the excavation of all blastholes on the planned well working face, the drilling trolley maintains the same posture and angle throughout the drilling process to form a group of parallel blastholes with similar hole deviation rates of less than 1.5%. Among them, the blastholes located in the groove area are 0.5 to 1.0 meters deeper than the expansion ring blastholes and the surrounding holes;

[0009] S3 Arrange the detonation network: Detonators are set outside the planned well drilling area, and explosives are filled in the charging holes through a coupled continuous charging method. Detonating warheads made of digital electronic detonators and emulsion explosive strips are arranged at intervals in each charging hole. Detonating warheads are arranged at intervals of 3.5m in the central slot hole, the slot hole, and the expanded slot hole, and at intervals of 6.0m in the peripheral holes. A detonating cord is laid throughout the entire charging length of each charging hole. The detonator, digital electronic detonator, the detonating warheads of each charging hole, and the detonating cord together form a clustered detonation network. After charging is completed, the hole mouth of each charging hole is sealed with taphole mud, and the length of the blocking taphole mud is not less than 0.3m.

[0010] S4 Detonation sequence and blasting: The center slot hole is detonated first, and blasting is carried out layer by layer with the center slot hole as the center. The charge holes in each layer are staggered: one or two charge holes with connected diameters in the same layer are detonated simultaneously. The diameter of the previous blast hole and the diameter of the next blast hole are arranged in a "cross" or "X" shape to set the detonation sequence. The interval between the first and second blast holes is set to 1000 milliseconds, and the interval between the detonation of the remaining blast holes is set to 500 milliseconds. The blasting operation is started and completed;

[0011] Based on the above steps, multiple grooving schemes can be formed through the blasthole arrangement structure, and empty holes can be used as pre-crack holes to protect adjacent charging holes, thereby improving the wall quality of the cavity after blasting. The grooving holes are designed to be ultra-deep, and the grooving height is sufficient, which has the characteristics of guaranteed grooving area formation, sufficient post-blasting compensation space, less blasting interference between adjacent charging holes, and complete detonation; the compensation space is sufficient, the blasting interference between adjacent charging holes is less, and the detonation is complete; the drilling process with a fixed angle throughout the process has the characteristics of high drilling accuracy, low overall hole deflection rate, high parallelism of each blasthole, not easy to be perforated, and large well depth; by arranging the detonating warhead group at intervals The clustered detonation network avoids the situation where there is no detonation energy after the explosive column is accidentally cut off, resulting in incomplete detonation; the middle slot hole is detonated first, and the remaining blastholes are detonated simultaneously according to one or two blastholes connected by diameter in the same layer. The connection line of the later detonated blastholes and the connection line of the earlier detonated blastholes are staggered in a "cross" or "X" shape and detonated in sequence. Adjacent detonated blastholes are separated by empty holes or large hole spacing. It has the characteristics of short total blasting time, sufficient time for adjacent charging holes to drop ore, sufficient compensation space, and high success rate of single-hole blasting. The use of this one-time well completion method has the advantages of high one-time well completion rate and well completion depth of up to 18m or more.

[0012] Furthermore, the spacing between the central cut hole, the cut hole, and the empty hole in S1 is determined comprehensively based on the blasting stress wave crack circle radius estimation method and compensation space theory, specifically including:

[0013] S1.1 Based on the blasting stress wave crack circle radius estimation formulas a = (2-4) d + D / 2 and a = (10-15) d / 2, the first limited range of the hole spacing a is obtained to be 212-600 mm;

[0014] S1.2 According to the compensation space theory, a≤π / 4[(D^2+d^2)(K+1) / (D+d)(K-1)], where K is the rock expansion coefficient and is set to 1.5, the second limit range of the hole spacing a is no more than 405 mm;

[0015] S1.3 Taking into account the hole deflection rate of 1.5% and the compensation space of not less than 30%, combined with the hole spacing range determined in S1.1 and S1.2, the final hole spacing a range is determined to be 200 to 400 mm.

[0016] Preferably, the hole spacing between the empty holes of the protection ring and the central groove hole in S1 is 300 mm, the hole spacing between adjacent empty holes on the protection ring is 300 mm, and the radius of the groove area is 600 mm.

[0017] The hole spacing in the slot area determined based on the above method can ensure that there is an interaction zone for blasting between the slot holes during slot blasting, while also reducing the impact of hole deviation on the blasting depth of the slot holes and effectively protecting adjacent slot holes, so that each slot blasting area has the ability to independently form a slot blasting, providing a compensation space of no less than 30% for subsequent blasting.

[0018] Preferably, the number of empty holes arranged on the protection ring is 6, the number of groove holes and empty holes arranged on the groove ring is 6, the number of empty holes and expanded groove holes arranged on the expanded groove ring is equal and an even number, and the number of expanded groove holes on the expanded groove ring is at least 8.

[0019] Preferably, the drilling trolley in S2 is a hydraulic medium-deep hole mining trolley, which realizes the movement positioning of the whole machine through an electronic control system. The mining trolley controls the rock drilling operation and the anti-jamming drill system through a PLC control computer to improve the positioning accuracy and drilling accuracy.

[0020] Furthermore, the S2 drilling process also includes: when passing through the rock stratum boundary zone, reducing the drilling speed of the drilling trolley and repeatedly sweeping the hole up and down, and restoring the original drilling speed after passing through the rock stratum boundary zone to ensure that the aperture and verticality of the blasthole at the rock stratum boundary zone are consistent with those at the non-junction zone.

[0021] Preferably, each charging hole in S3 is filled with emulsified granular ammonium nitrate explosive using a BQF-100-II pneumatic charging device, the charging working air pressure is 0.25-0.6 MPa, and the density of the filled explosive is 0.95-1 g / cm 3 .

[0022] Beneficial effects

[0023] One of the above technical solutions has the following advantages or beneficial effects:

[0024] 1) Multiple slot blasting zones are formed by arranging multiple slot holes and surrounding empty holes. The slot holes and empty holes are arranged at intervals on the slot expansion ring to form a blasthole structure with multiple slotting schemes, empty holes protecting charging holes, and ultra-deep slot holes. When the blasting of the central slot hole fails or the slot height is insufficient, the remaining slot holes can be re-blasted to form the compensation space required for subsequent blasting. This has the characteristics of sufficient slot area height, sufficient compensation space for subsequent blasting, less blasting interference between adjacent charging holes, and complete detonation.

[0025] 2) Through the use of spraying concrete on the simulated well surface, total station positioning, PLC linkage control of the drilling trolley, and drilling holes at the same fixed angle and the same posture throughout the process, it has the characteristics of high positioning accuracy, high drilling accuracy, high parallelism of each blasthole, low overall hole deviation rate, difficulty in perforation, and large well depth, which greatly improves the success rate of one-time well blasting;

[0026] 3) By arranging explosive warheads at intervals in the charge holes to form a cluster-linked detonation network, the middle slot hole is detonated first, and the remaining blast holes are detonated simultaneously according to one or two blast holes connected by diameter in the same layer. The line connecting the later detonated blast holes and the line connecting the earlier detonated blast holes are staggered in a "cross" or "X" shape and detonated in sequence. Adjacent detonated blast holes are separated by empty holes or large hole spacing is set. This has the characteristics of short total blasting time, sufficient time for adjacent charge holes to fall ore, sufficient compensation space, and high success rate of single-hole blasting;

[0027] 4) The one-time well construction method formed by the above-mentioned process steps has the characteristics of fewer charging holes, low consumption of pyrotechnics, simple process control, high one-time blasting well construction rate and well construction depth of up to 18m and above. It is suitable for the excavation of high-depth blind shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0029] Figure 1 It is a schematic diagram of the blasthole arrangement structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the blasthole charging structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the detonation sequence of a certain well section of the present invention;

[0032] In the figure: central groove hole 10; protection ring 11; groove ring 12; groove hole 121; expansion ring 20; expansion hole 21; forming ring 30; peripheral hole 31; detonating warhead 41; detonating cord 42. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0034] The following is an example of a blind shaft with a φ3m excavation and a depth of 18m. Figures 1 to 3 As shown, the present invention provides a method for drilling a high-depth blind well in one go, comprising the following steps:

[0035] S1 Arrange the blast holes: Figure 1As shown, a central slot hole 10 is arranged at the center point of the blind shaft blasting area, and a circle of empty holes are arranged at equal angles around the central slot hole 10 as a slot protection circle 11. A slot circle 12 is arranged outside the protection circle 11. Slot holes 121 and empty holes are alternately arranged at equal intervals on the slot circle 12 according to the preset hole spacing. The central slot hole 10, the protection circle 11 and the slot circle 12 together constitute a slot area. The slot holes 121 and the empty holes around them form multiple groups of slot blasting areas. At least one slot circle 12 is arranged outside the slot circle 12. The expansion ring 20 has an expanded slot ring 20, on which expanded slot holes 21 and empty holes are alternately arranged at equal intervals according to a preset hole spacing. A forming ring 30 is provided outside the expansion ring 20, and peripheral holes 31 are arranged at equal intervals on the forming ring 30. The diameter D of the empty holes is 120 mm. The central cutout hole 10, the cutout hole 121, the expanded slot hole 21, and the peripheral holes 31 are all charging holes. The diameter d of the charging holes is 76 mm. The cutout hole 121, the expanded slot hole 21, and the peripheral holes 31 are all in an even number, and the line connecting two opposite charging holes passes through the center of the circle.

[0036] The spacing between the central cut hole 10, the cut hole 121 and the empty hole in the cut area is determined based on the blasting stress wave crack circle radius estimation method and the compensation space theory. The determination process specifically includes:

[0037] S1.1 Based on the blasting stress wave crack circle radius estimation formulas a = (2-4) d + D / 2 and a = (10-15) d / 2, the first limited range of the hole spacing a is obtained to be 212-600 mm;

[0038] S1.2 According to the compensation space theory, a≤π / 4[(D^2+d^2)(K+1) / (D+d)(K-1)], where K is the rock expansion coefficient and is set to 1.5, the second limit range of the hole spacing a is no more than 405 mm;

[0039] S1.3 Taking into account the hole deflection rate of 1.5% and the compensation space of not less than 30%, combined with the hole spacing range determined in S1.1 and S1.2, the final hole spacing a range is determined to be 200 to 400 mm.

[0040] Preferably, the number of empty holes arranged on the protection ring 11 is 6, the number of groove holes 121 and empty holes arranged on the groove ring 12 is 6, the number of empty holes and the number of groove holes 21 arranged on the expansion groove ring 20 are equal and are an even number, the number of expansion groove holes 21 on the expansion groove ring 20 is at least 8, the hole spacing between the empty holes of the protection ring 11 and the central groove hole 10 in S1 is 300 mm, the hole spacing between adjacent empty holes on the protection ring 11 is 300 mm, the radius of the groove area is 600 mm, the blast holes on the expansion groove ring 20 and the forming ring 30 are equidistant and uniformly arranged, the number of expansion groove rings 20 is determined according to the radius of the planned well and the layer spacing between adjacent blasting circles is not less than 300 mm, such as Figure 1As shown, there is one expanding groove ring 20, including 8 expanding groove holes 21 and 8 empty holes, the hole spacing is 400mm, the layer spacing between the expanding groove ring 20 and the grooving ring 12 is 450mm, the peripheral holes 31 are 8, the hole spacing is 1150mm, and the layer spacing between the forming ring 30 and the expanding groove ring 20 is also 450mm.

[0041] S2 drilling: The cutting tunnel is cleaned and leveled until the tunnel bottom is hard, and the top of the tunnel at the planned well working face is sprayed with concrete in full section until the tunnel roof is level to avoid displacement of the opening when drilling begins. The opening position of each blasthole in S1 is located using a total station, and spray-painted marks are used to facilitate accurate positioning of the preset blasthole positions; a hydraulic medium- and long-hole mining trolley is used for drilling operations, and the action positioning of the entire machine is achieved through an electronic control system. The rock drilling action and the anti-jamming drill system are controlled by a PLC-controlled computer to improve drilling accuracy. The drilling angle of the mining trolley is adjusted to be vertically upward relative to the cutting tunnel, and the drilling operation is started at a fixed speed. During the entire operation, the mining trolley maintains the same posture and angle. During drilling operations, when it is necessary to cross the rock boundary zone, the drilling speed of the drilling trolley is reduced and the hole is repeatedly swept up and down. After passing the rock boundary zone, the original drilling speed is restored, and finally a group of blastholes that are parallel to each other and have similar hole deviation rates of less than 1.5% are formed. Among them, the blastholes located in the groove area (including the central groove hole 10, the groove hole 121, the protection ring 11 and the empty holes on the groove ring 12) are 0.5 to 1.0 m deeper than the blastholes in the expansion groove ring 20 (that is, the expansion groove hole 21 and the empty holes thereon) and the peripheral holes 31. For example, when excavating a φ3m and 18m deep blind shaft, the excavation depth of the groove ring 12 blasthole is 18.86m, and the excavation depth of the expansion groove ring 20 blasthole and the peripheral holes 31 is 18.16m.

[0042] S3 Arrange the detonation network: a detonator is set outside the planned well area (not shown in the attached figure). Each charging hole is filled with emulsified granular ammonium nitrate oil explosive using a BQF-100-II pneumatic charging device in a continuous coupled charging manner. The working air pressure of the charging device is 0.25-0.6 MPa, and the density of the filled explosive is 0.95-1 g / cm 3 , in each charge hole, an explosive warhead 41 made of a digital electronic detonator and an emulsion explosive strip is arranged at intervals, wherein, Figure 2 As shown, the central slot hole 10, the slot hole 121 and the expanded slot hole 21 are arranged with detonating warheads 41 at intervals of 3.5 m, and the peripheral holes 31 are arranged with detonating warheads 41 at intervals of 6.0 m. A detonating cord 42 is arranged within the entire charging length of each charging hole. Figure 2 and Figure 3As shown, the detonator, digital electronic detonator, detonating warhead 41 of each charging hole and detonating cord 42 together constitute a cluster-linked detonating network, wherein the detonating detonator in the detonating warhead can be connected to the detonating network through the detonating cord or detonator leg wire. After the charging is completed, the hole mouth of each charging hole is blocked with gun mud, and the blocking gun mud length is not less than 0.3m;

[0043] S4 Detonation sequence and blasting: The center slot hole 10 is detonated first, and the center slot hole 10 is used as the center to blast outward layer by layer. The charge holes of each layer are staggered: one or two charge holes with connected diameters in the same layer are detonated at the same time. The diameter of the previous blast hole and the diameter of the next blast hole are arranged in a "cross" or "X" shape to set the detonation sequence. The interval between the first and second blasts is set to 1000 milliseconds, and the interval between the detonations of the remaining blast holes is set to 500 milliseconds. Start the blasting operation until the blasting is completed; specifically, Figure 3 As shown, the detonation time of the central slot hole 10 is set to 0ms as the first blasting hole, and the slot holes 121b and e on the slot ring 12 are located on the same diameter and detonated at the same time as the second blasting hole, and the detonation time difference with the central slot hole 10 is 1000ms. The diameter formed by the line connecting the slot holes 121c and f is in an "X" shape with the diameter of the slot holes 121b and e. The detonation time of c and f is both 1500ms, that is, the time difference with the second blasting is 500ms. After that, the blasting interval is 500ms. The expansion slot hole 21 and the peripheral hole 31 are the same. There are four blasting holes, every two blasting holes are on the same diameter, and the diameter of the connecting line of adjacent blasting holes is in an "X" shape, such as the expansion slot holes 21m / i / h / l on the expansion slot ring 20 and the peripheral holes 31p / q / t / u on the forming ring 30. The interval between two adjacent blasting is also 500ms. This detonation sequence can shorten the total blasting time, reduce the mutual interference of adjacent detonating blasting holes through the spacing between empty holes or large holes, improve the blasting success rate of a single hole, and thus improve the success rate of well completion by blasting in one time, forming a high-depth blind well with a well depth of 18m or more.

[0044] The above description is a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of protection of the present invention.

Claims

1. A method for drilling a high-depth blind well in one go, characterized in that: The steps include: S1 Arrange blastholes: Arrange a central slot hole at the center of the blind skylight blasting area, and arrange a circle of empty holes at equal angles around the central slot hole as a slot protection circle. Set a slot circle outside the protection circle, and arrange slot holes and empty holes alternately and equidistantly on the slot circle according to a preset hole spacing. The central slot hole, the protection circle, and the slot circle together constitute a slot area. The slot holes and the empty holes around them form multiple slot blasting areas. Arrange at least one expansion slot circle outside the slot circle, and arrange expansion slot holes and empty holes alternately and equidistantly on the expansion slot circle according to a preset hole spacing. Set a forming ring outside the expansion slot circle, and arrange peripheral holes at equal intervals on the forming ring. The diameter D of the empty holes is 120 mm. The central slot hole, slot hole, expansion slot hole, and peripheral holes are all charging holes. The diameter d of the charging holes is 76 mm. The number of slot holes, expansion slot holes, and peripheral holes is even, and the line connecting two opposite charging holes passes through the center of the circle. S2 drilling: The cutting tunnel is cleaned until the bottom of the tunnel is hard, and the top of the tunnel at the planned well working face is sprayed with concrete in full section until the tunnel roof is flat. The opening position of each blasthole in S1 is located using a total station and marked with paint; the drilling trolley angle is adjusted to be vertically upward relative to the cutting tunnel, and the trolley angle is fixed to start drilling. During the excavation of all blastholes on the planned well working face, the drilling trolley maintains the same posture and angle throughout the drilling process to form a group of parallel blastholes with similar hole deviation rates of less than 1.5%. Among them, the blastholes located in the groove area are 0.5 to 1.0 meters deeper than the expansion ring blastholes and the surrounding holes; S3 Arrange the detonation network: Detonators are set outside the planned well drilling area, and explosives are filled in the charging holes through a coupled continuous charging method. Detonating warheads made of digital electronic detonators and emulsion explosive strips are arranged at intervals in each charging hole. Detonating warheads are arranged at intervals of 3.5m in the central slot hole, the slot hole, and the expanded slot hole, and at intervals of 6.0m in the peripheral holes. A detonating cord is laid throughout the entire charging length of each charging hole. The detonator, digital electronic detonator, the detonating warheads of each charging hole, and the detonating cord together form a clustered detonation network. After charging is completed, the hole mouth of each charging hole is sealed with taphole mud, and the length of the blocking taphole mud is not less than 0.3m. S4 Detonation sequence and blasting: The center slot hole is detonated first, and blasted outward layer by layer with the center slot hole as the center. The charge holes in each layer are staggered: one or two charge holes with connected diameters in the same layer are detonated at the same time. The diameter of the previous blasting hole and the diameter of the next blasting hole are set in a "cross" or "×" shape to set the detonation sequence. The interval between the first and second blasting is set to 1000 milliseconds, and the interval between the detonation of the remaining holes is set to 500 milliseconds. Start the blasting operation until the blasting is completed.

2. The method for high-depth blind shaft construction in one go according to claim 1, characterized in that: The spacing between the central cut hole, cut hole and empty hole in S1 is determined based on the blasting stress wave crack circle radius estimation method and compensation space theory, specifically including: S1.1 Based on the blasting stress wave crack circle radius estimation formulas a = (2-4) d + D / 2 and a = (10-15) d / 2, the first limited range of the hole spacing a is obtained to be 212-600 mm; S1.2 According to the compensation space theory, a≤π / 4[(D^2+d^2)(K+1) / (D+d)(K-1)], where K is the rock expansion coefficient and is set to 1.5, the second limit range of the hole spacing a is no more than 405 mm; S1.3 Taking into account the hole deflection rate of 1.5% and the compensation space of not less than 30%, combined with the hole spacing range determined in S1.1 and S1.2, the final hole spacing a range is determined to be 200 to 400 mm.

3. The method for high-depth blind shaft construction in one go according to claim 2, characterized in that: The hole spacing between the empty holes in the protection ring and the central groove hole in S1 is 300 mm, the hole spacing between adjacent empty holes on the protection ring is 300 mm, and the radius of the groove area is 600 mm.

4. The method for drilling a high-depth blind shaft in one go according to claim 1, characterized in that: The number of empty holes arranged on the protection ring is 6, the number of groove holes and empty holes arranged on the groove ring is 6, the number of empty holes and the number of expanded groove holes arranged on the expanded groove ring are equal and are an even number, and the number of expanded groove holes on the expanded groove ring is at least 8.

5. The method for drilling a high-depth blind shaft in one go according to claim 1, characterized in that: The drilling trolley in S2 is a hydraulic medium-deep hole mining trolley. The mining trolley realizes the movement and positioning of the whole machine through an electric control system. The mining trolley controls the rock drilling operation and the anti-jamming drill system through a PLC control computer.

6. The method for drilling a high-depth blind shaft in one go according to claim 1, characterized in that: The drilling process of S2 also includes: when passing through the boundary zone of the rock strata, reducing the drilling speed of the drilling trolley and repeatedly sweeping the hole up and down, and restoring the original drilling speed after passing through the boundary zone of the rock strata.

7. The method for constructing a high-depth blind shaft in one go according to claim 1, characterized in that: Each charging hole in S3 is filled with emulsified granular ammonium nitrate explosive using a BQF-100-II pneumatic charging device. The charging working air pressure is 0.25-0.6 MPa, and the density of the filled explosive is 0.95-1 g / cm 3 .

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