CN110924957A - Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway - Google Patents
Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway Download PDFInfo
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- CN110924957A CN110924957A CN201911367005.7A CN201911367005A CN110924957A CN 110924957 A CN110924957 A CN 110924957A CN 201911367005 A CN201911367005 A CN 201911367005A CN 110924957 A CN110924957 A CN 110924957A
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- 239000011435 rock Substances 0.000 title claims abstract description 25
- 238000010276 construction Methods 0.000 title claims description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 34
- 239000003814 drug Substances 0.000 claims description 9
- 239000002360 explosive Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 239000010878 waste rock Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention belongs to the technical field of mine excavation, and provides a blast hole arrangement mode of a whole-rock roadway small-section roadway, which comprises 14 crushing holes, 10 cutting holes, 15 peripheral holes, 5 bottom holes and 16 auxiliary holes, wherein the 14 crushing holes are arranged at the middle lower part of the roadway section, are arranged in two rows, are respectively positioned at two sides of the central line of the roadway and are arranged in a staggered manner; the 10 cutting holes are arranged at the middle lower part of the section of the roadway, are arranged into two rows, are respectively positioned at two sides of the central line of the roadway and are symmetrically arranged, and the distance between the cutting holes and the central line of the roadway is larger than the distance between the crushing holes and the central line of the roadway; 15 peripheral holes are arranged along a straight wall section and an arch raising line of the section of the roadway; 5 bottom holes are arranged on the bottom contour line of the roadway section; the 16 auxiliary holes are arranged on the roadway section and located between the cut-out holes and the peripheral holes. The blast hole arrangement mode of the all-rock roadway small-section roadway provided by the invention has the advantages of faster tunneling progress and lower material consumption.
Description
Technical Field
The invention relates to the technical field of mine excavation, in particular to a blast hole arrangement mode and a blast hole construction method for a full-rock roadway small-section roadway.
Background
At present, the conventional shallow hole and small hole blasting modes are generally adopted in the whole rock roadway small-section roadway, the blast hole arrangement mode is shown in figure 1, and the blast hole arrangement mode usually comprises 6 cut holes, 16 auxiliary holes, 20 peripheral holes and 7 bottom holes, so that the blast hole arrangement mode has the disadvantages of slow tunneling progress, more use amount of materials such as explosives, detonators and the like and higher cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a shot hole arrangement mode and a shot hole construction method for a small-section roadway of a whole rock roadway, so as to improve the tunneling progress of the roadway and reduce the material consumption cost.
In order to achieve the above object, in one aspect, the present invention provides a shot hole arrangement method for a small-section roadway of a whole rock roadway, including:
14 crushing holes are arranged at the middle lower part of the section of the roadway, the 14 crushing holes are arranged into two rows, each row is provided with 7 crushing holes, and the two rows of crushing holes are respectively positioned at two sides of the central line of the roadway and are arranged in a staggered manner;
the crushing device comprises 10 cutting holes arranged at the middle lower part of a roadway section, wherein the cutting holes are arranged in two rows, 5 cutting holes are arranged in each row, the two rows of cutting holes are respectively positioned at two sides of the central line of the roadway and are symmetrically arranged, and the distance between each cutting hole and the central line of the roadway is greater than that between each crushing hole and the central line of the roadway;
15 peripheral holes along the straight wall section and the arch camber line of the end surface of the roadway;
5 bottom holes arranged on the bottom contour line of the roadway section; and
and 16 auxiliary holes which are arranged on the roadway section and are positioned between the undercut holes and the peripheral holes.
Further, the distance between the crushing hole and the center line of the roadway is 120-145mm, the distance between the crushing hole positioned at the lowest position and the bottom plate of the roadway is 340-360mm, the hole depth of the crushing hole is 2000-2500mm, the hole diameter is 50-65mm, the distance is 150-170mm, and the horizontal angle is 84-90 degrees;
the distance between the cut hole and the central line of the roadway is 575-594mm, the distance between the cut hole positioned at the lowest part and the bottom plate of the roadway is 320-340mm, the hole depth of the cut hole is 2000-2500mm, the hole diameter is 36-50mm, the distance is 290-310mm, and the horizontal angle is 75-85 degrees;
the hole depth of the peripheral holes is 2000-2500mm, the hole diameter is 36-50mm, the vertical angle is 0-2 degrees, the distance between the peripheral holes positioned on the straight wall section of the roadway is 450-550mm, and the distance between the peripheral holes positioned on the arch raising line of the roadway is 350-450 mm;
the hole depth of the bottom hole is 2500mm, the hole diameter is 36-50mm, the distance is 650 mm and 750mm, and the vertical angle is 0-2 degrees;
the auxiliary hole has a hole depth of 2000-2500mm, a hole diameter of 36-50mm, an upper-lower distance of 350-400mm and a horizontal angle of 77-83 degrees.
Further, the air conditioner is provided with a fan,
the broken eyes are empty eyes;
the explosive loading of the cut hole is 1.2-2.0 Kg/hole, and the number of detonators is 2 pieces/hole;
the medicine loading of the peripheral holes is 0.7-1.0 Kg/hole, and the number of detonators is 1 round/hole;
the medicine loading of the bottom hole is 0.7-1.0 Kg/hole, and the number of detonators is 1 round/hole;
the medicine loading of the auxiliary hole is 1.0-1.5 Kg/hole, and the number of the detonators is 1.
Further, the mud sealing length of the cut hole, the auxiliary hole, the peripheral hole and the bottom hole is not less than 500 mm.
In another aspect, the present invention provides a method for constructing a blasthole, including the steps of:
the 14 crushing holes are constructed from 350mm above a roadway bottom plate, the left and right spacing is 132.5mm, the up and down spacing is 160mm based on the central line of the roadway, the construction is staggered, the hole depth is 2300mm, and the construction angle is 87 degrees;
the 10 cut holes are constructed from 330mm above a roadway bottom plate, the left-right distance is 584.5mm, the up-down distance is 300mm, the hole depth is 2300mm and the construction angle is 78 degrees by taking the central line of the roadway as a reference;
the 16 auxiliary holes are constructed from 300mm above a roadway bottom plate, the left-right distance is 884.5mm, the up-down distance is 400mm, the hole depth is 2300mm, and the construction angle is 80 degrees on the basis of the roadway center line;
constructing 15 peripheral holes along the contour line of the roadway, wherein the distance between straight wall sections is 500mm, the distance between arch raising lines is 400mm, and the construction is horizontally inclined for 0-2 degrees;
5 the bottom holes are constructed along the contour line of the bottom of the roadway at intervals of 700mm, and the construction is vertically inclined by 0-2 degrees.
The invention has the beneficial effects that:
1. according to the blast hole arrangement mode of the small-section roadway of the whole rock roadway, provided by the invention, more free surfaces are built on the tunneling working surface by arranging the crushing holes, so that the waste rock after blast of the cut hole is discharged, conditions are created for expanding the blasting range, the tunneling progress of the roadway is further improved, and the material consumption cost is reduced.
2. According to the blast hole arrangement mode of the all-rock roadway small-section roadway, the hole depths of the cut holes, the auxiliary holes, the peripheral holes and the bottom holes are increased to 2300mm, so that the optimal blasting condition is favorably formed, the tunneling progress of the roadway is further improved, and the material consumption cost is reduced.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a shot hole arrangement manner of a full-rock roadway low-profile roadway disclosed in the prior art;
fig. 2 is a schematic diagram of a shot hole arrangement manner of a full-rock roadway low-profile roadway according to an embodiment of the present invention;
fig. 3 is a schematic diagram of crushing holes, cutting holes and auxiliary holes of the shot hole arrangement mode of the full-rock roadway low-section roadway shown in fig. 2.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, a shot hole arrangement method for a full-rock roadway low-profile roadway disclosed in the prior art includes: a slotted eye 101, an auxiliary eye 102, a peripheral eye 103 and a bottom eye 104.
The number of the cutting holes 101 is 6, the number is 1-6, the hole depth is 1800mm, the hole diameter is 36mm, the horizontal inclination angle is 70 degrees, the vertical inclination angle is 0 degree, the loading amount is 1.2 Kg/hole, and the detonator amount is 1 piece/hole.
The number of the auxiliary holes 102 is 16, the number is 7-22, the hole depth is 1600mm, the hole diameter is 36mm, the horizontal inclination angle is 0 degrees, the vertical inclination angle is 0 degrees, the loading amount is 0.9 Kg/hole, and the detonator amount is 1 round/hole.
The number of the peripheral holes 103 is 20, the number is 23-42, the hole depth is 1600mm, the hole diameter is 36mm, the horizontal inclination angle is 0 degrees, the vertical inclination angle is 0-2 degrees, the loading amount is 0.6 Kg/hole, and the detonator amount is 1 piece/hole.
The number of the bottom holes 104 is 20, the number is 43-49, the hole depth is 1600mm, the hole diameter is 36mm, the horizontal inclination angle is 0 degrees, the vertical inclination angle is 0-2 degrees, the loading amount is 0.6 Kg/hole, and the detonator amount is 1 piece/hole.
The sealing mud length is not less than 500 mm.
Blasting effect: through the blast hole mode arrangement of the all-rock roadway small-section roadway, the length of a wedge-shaped cut hole 01 for tunneling in an original gas roadway of a mine is 1.8m, the effective depth of other blast holes is 1.6 m, the circulating footage after blasting is 1.0-1.2 m, the average footage is 1.1m, and the average utilization rate of the blast holes is 67%. And the monthly hidden trouble investigation and advanced hole probing construction influence are eliminated, and the monthly average progress is 130.32 m. The original gas lane has the explosive consumption per meter of 34.36Kg/m and the detonator consumption per meter of 44.55 pieces/m.
As shown in fig. 2-3, the invention provides a blast hole arrangement mode of a small-section roadway of a whole rock roadway, wherein the blast hole comprises a crushing hole 201, a cutting hole 202, an auxiliary hole 203, a peripheral hole 204 and a bottom hole 205.
The breaking hole 201 is used for creating more free surfaces on the driving face, which is beneficial to discharging gangue after the blast of the cutting hole 202 and creates conditions for enlarging the blast range. The number of the crushing holes 201 is 14, the number is 1-14, 14 crushing holes 201 are arranged at the middle lower part of the section of the roadway, the 14 crushing holes 201 are arranged in two rows, 7 crushing holes are arranged in each row, are respectively positioned at two sides of the central line of the roadway and are arranged in a staggered mode, namely the crushing holes 201 positioned at one side of the central line of the roadway are aligned to the central line of the connecting line of the two crushing holes 201 positioned at the other side of the central line of the roadway.
The underholing 202 is used for blasting a slot cavity on the roadway working face, and a new free surface is added for blasting of other blastholes, so that the clamping effect of rocks is reduced, and the blasting effect is improved. The number of the cutting holes is 10, the number is 15-24, 10 cutting holes 202 are arranged at the middle lower part of the section of the roadway, the 10 cutting holes 202 are arranged in two rows, 5 in each row, are respectively positioned at two sides of the central line of the roadway and are symmetrically arranged, and the distance between the cutting holes 202 and the central line of the roadway is greater than the distance between the crushing holes 201 and the central line of the roadway.
The number of auxiliary eyes 203 is 16, numbered 25-40, which are arranged on the roadway section between the cut out eye 202 and the peripheral eye 204.
The perimeter holes 204 are used to control the profile of the roadway section. The number of the holes is 15, the number is 41-55, and 15 peripheral holes are arranged along the straight wall section and the arch camber line of the roadway section.
In one embodiment, the distance between the crushing hole 201 and the center line of the roadway is 120-145mm, and the distance is reasonably selected according to the size of the roadway, and the distance is preferably 132.5mm in the embodiment. The distance between the lowermost crushing hole 201 and the bottom plate of the roadway is 340-360mm, and the distance is reasonably selected according to the size of the roadway, and the selected distance is preferably 350mm in the embodiment. The breaking hole 201 has a hole depth of 2000-2500mm, a hole diameter of 50-65mm, a distance of 150-170mm and a horizontal angle of 84-90 degrees. In this embodiment the crushing eye 201 has a hole depth of 2300mm, a hole diameter of 65mm, a pitch of 160mm and a horizontal angle of 87 °.
The distance between the slotted hole 202 and the central line of the roadway is 575-594mm, and the distance is reasonably selected according to the size of the roadway, and the distance is preferably 584.5mm in the embodiment. The distance between the lowermost slot 202 and the bottom plate of the roadway is 320-340mm, and the distance is reasonably selected according to the size of the roadway, and in this embodiment, the distance is preferably 330 mm. The depth of the cut hole 202 is 2500mm for 2000-. In the present embodiment, the depth of the cutting hole 202 is 2300mm, the diameter of the hole is 36mm, the distance is 300mm, and the horizontal angle is 78 degrees.
The distance between the peripheral holes 204 of the straight wall section on the section of the roadway is 450-550mm, and the distance is reasonably selected according to the size of the roadway, and the distance is preferably 500mm in the embodiment. The distance between the peripheral holes 204 of the arch camber line on the roadway section is 350-450mm, and the distance is reasonably selected according to the roadway size, and the distance is preferably 400mm in the embodiment. The hole depth of the peripheral hole 204 is 2000-2500mm, the hole diameter is 36-50mm, and the vertical angle is 0-2 degrees. In this embodiment the peripheral eye 204 has a hole depth of 2300mm, a hole diameter of 36mm and a vertical angle of 0-2 °.
The distance between the bottom holes 205 is 650-750mm, and the distance is reasonably selected according to the size of the roadway, and the distance is preferably 700mm in the embodiment. The hole depth is 2000-2500mm, the hole diameter is 36-50mm, and the vertical angle is 0-2 deg. In this embodiment the eyelet 205 has a hole depth of 2300mm, an aperture diameter of 36mm and a vertical angle of 0-2.
The auxiliary eye 203 has the hole depth of 2000-2500mm, the hole diameter of 36mm and the horizontal angle of 77-83 degrees. In this embodiment the auxiliary eye 203 has a hole depth of 2300mm, a hole diameter of 36mm and a horizontal angle of 80 °.
In one embodiment, the fracturing eye 201 is a hollow eye, i.e., not filled with explosive. The explosive loading of the cutting hole 202 is 1.2-2.0 Kg/hole, and the number of detonators is 2 per hole. The loading of the peripheral hole 204 is 0.7-1.0 Kg/hole, and the number of detonators is 1 round/hole. The bottom hole 205 has a loading of 0.7-1.0 Kg/hole and a detonator number of 1 detonator/hole. The auxiliary hole 203 has a loading of 1.0-1.5 Kg/hole and a detonator count of 1 detonator/hole. The loading of the slotted eye 202, numbered 15-24 in this example, is 1.5 Kg/hole. The auxiliary eye 203 with the number of 25-26 has the drug loading of 1.2 Kg/hole, the auxiliary eye 203 with the number of 27-32 has the drug loading of 1.5 Kg/hole, and the auxiliary eye 203 with the number of 33-40 has the drug loading of 1.2 Kg/hole. The peripheral eyes 204 numbered 41-55 and the bottom eyes 205 numbered 56-60 had a loading of 0.9 Kg/hole.
In one embodiment, the mud jacking length of the undercutting eye 202, the auxiliary eye 203, the peripheral eye 204 and the bottom eye 205 is not less than 500 mm.
Blasting effect: according to the shot hole arrangement mode of the all-rock roadway small-section roadway provided by the embodiment, the shot hole depth is 2300mm, the average circulating footage after blasting is 1.81m, and the average utilization rate of the shot holes is 75%. The roadway is averagely circulated for 5 times every day, the influence of monthly hidden trouble investigation and advanced borehole construction is eliminated, and the monthly average progress is 99.3 m. The original gas lane has the explosive consumption per meter of 33.5Kg/m and the detonator consumption per meter of 30.94 pieces/m.
The invention also provides a construction method of the blast hole, which comprises the following steps:
the 14 crushing holes are constructed from 350mm above a roadway bottom plate, the left and right spacing is 132.5mm, the up and down spacing is 160mm based on the central line of the roadway, the construction is staggered, the hole depth is 2300mm, and the construction angle is 87 degrees;
the 10 cut holes are constructed from 330mm above a roadway bottom plate, the left-right distance is 584.5mm, the up-down distance is 300mm, the hole depth is 2300mm and the construction angle is 78 degrees by taking the central line of the roadway as a reference;
the 16 auxiliary holes are constructed from 300mm above a roadway bottom plate, the left-right distance is 884.5mm, the up-down distance is 400mm, the hole depth is 2300mm, and the construction angle is 80 degrees on the basis of the roadway center line;
constructing 15 peripheral holes along the contour line of the roadway, wherein the distance between straight wall sections is 500mm, the distance between arch raising lines is 400mm, and the construction is horizontally inclined for 0-2 degrees;
5 the bottom holes are constructed along the contour line of the bottom of the roadway at intervals of 700mm, and the construction is vertically inclined by 0-2 degrees.
By contrast, according to the shot hole arrangement mode of the whole-rock roadway small-section roadway provided by the embodiment, the monthly average progress is improved to 130.32m from the original 99.3m, and the working efficiency is effectively improved. The explosive consumption per meter is reduced from 34.36Kg/m to 33.15Kg/m, and the detonator consumption per meter is reduced from 44.55 to 30.94 rounds/m. The cost consumption is saved.
In addition, after the roadway is tunneled for a long distance, the workload of secondary circulation per shift is large and the time is long, and the staff needs to carry out the working procedures of hole drilling, charging, person removing, blasting, checking and the like again after 2 times of circulation, so that the working distance is long, the working time is long, the physical strength of the staff is reduced, the attention is not concentrated, and the safety threat is large.
After the deep hole blasting is adopted in the whole rock roadway, the blasting times of a single shift are reduced to 1 shift from the original 2 times/shift, and the safety threats of rock vibration, long action distance, repeated post standing and person removing and the like during blasting are reduced. The influence of repeated charging station blasting on the waste rock discharge of the working face is reduced, and the waste rock discharge time is prolonged. The safety accidents are reduced, and the roadway is constructed more safely, quickly and efficiently.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (5)
1. The utility model provides a big gun hole arrangement mode in little section tunnel of whole rock roadway which characterized in that includes:
14 crushing holes are arranged at the middle lower part of the section of the roadway, the 14 crushing holes are arranged into two rows, each row is provided with 7 crushing holes, and the two rows of crushing holes are respectively positioned at two sides of the central line of the roadway and are arranged in a staggered manner;
the crushing device comprises 10 cutting holes arranged at the middle lower part of a roadway section, wherein the cutting holes are arranged in two rows, 5 cutting holes are arranged in each row, the two rows of cutting holes are respectively positioned at two sides of the central line of the roadway and are symmetrically arranged, and the distance between each cutting hole and the central line of the roadway is greater than that between each crushing hole and the central line of the roadway;
15 peripheral holes along the straight wall section and the arch camber line of the roadway section;
5 bottom holes arranged on the bottom contour line of the roadway section; and
and 16 auxiliary holes which are arranged on the roadway section and are positioned between the undercut holes and the peripheral holes.
2. The shot hole arrangement mode of the whole rock roadway small-section roadway according to claim 1, characterized in that:
the distance between the crushing hole and the central line of the roadway is 145mm for 120-;
the distance between the cut hole and the central line of the roadway is 575-594mm, the distance between the cut hole positioned at the lowest part and the bottom plate of the roadway is 320-340mm, the hole depth of the cut hole is 2000-2500mm, the hole diameter is 36-50mm, the distance is 290-310mm, and the horizontal angle is 75-85 degrees;
the hole depth of the peripheral holes is 2000-2500mm, the hole diameter is 36-50mm, the vertical angle is 0-2 degrees, the distance between the peripheral holes positioned on the straight wall section of the roadway is 450-550mm, and the distance between the peripheral holes positioned on the arch raising line of the roadway is 350-450 mm;
the hole depth of the bottom hole is 2500mm, the hole diameter is 36-50mm, the distance is 650 mm and 750mm, and the vertical angle is 0-2 degrees;
the auxiliary hole has a hole depth of 2000-2500mm, a hole diameter of 36-50mm, an upper-lower distance of 350-400mm and a horizontal angle of 77-83 degrees.
3. The shot hole arrangement mode of the whole rock roadway small-section roadway according to claim 2, characterized in that:
the broken eyes are empty eyes;
the explosive loading of the cut hole is 1.2-2.0 Kg/hole, and the number of detonators is 2 pieces/hole;
the medicine loading of the peripheral holes is 0.7-1.0 Kg/hole, and the number of detonators is 1 round/hole;
the medicine loading of the bottom hole is 0.7-1.0 Kg/hole, and the number of detonators is 1 round/hole;
the medicine loading of the auxiliary hole is 1.0-1.5 Kg/hole, and the number of the detonators is 1.
4. A blasthole arrangement for a whole rock roadway low-profile roadway according to any one of claims 1 to 3, wherein the mud-sealing length of the undermining hole, the auxiliary hole, the peripheral hole and the bottom hole is not less than 500 mm.
5. A blasthole construction method applied to the blasthole arrangement as set forth in any one of claims 1 to 4, comprising the steps of:
the 14 crushing holes are constructed from 350mm above a roadway bottom plate, the left and right spacing is 132.5mm, the up and down spacing is 160mm based on the central line of the roadway, the construction is staggered, the hole depth is 2300mm, and the construction angle is 87 degrees;
the 10 cut holes are constructed from 330mm above a roadway bottom plate, the left-right distance is 584.5mm, the up-down distance is 300mm, the hole depth is 2300mm and the construction angle is 78 degrees by taking the central line of the roadway as a reference;
the 16 auxiliary holes are constructed from 300mm above a roadway bottom plate, the left-right distance is 884.5mm, the up-down distance is 400mm, the hole depth is 2300mm, and the construction angle is 80 degrees on the basis of the roadway center line;
constructing 15 peripheral holes along the contour line of the roadway, wherein the distance between straight wall sections is 500mm, the distance between arch raising lines is 400mm, and the construction is horizontally inclined for 0-2 degrees;
5 the bottom holes are constructed along the contour line of the bottom of the roadway at intervals of 700mm, and the construction is vertically inclined by 0-2 degrees.
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| CN201911367005.7A CN110924957A (en) | 2019-12-26 | 2019-12-26 | Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway |
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| CN201911367005.7A CN110924957A (en) | 2019-12-26 | 2019-12-26 | Blast hole arrangement mode and blast hole construction method for all-rock roadway small-section roadway |
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