Weak blasting blast hole layout structure for high-crustal-stress soft rock large-deformation tunnel

Abstract

The utility model provides a weak blasting blast hole layout structure of a high crustal stress soft rock large deformation tunnel, a tunnel face is divided into an upper section and a lower section, the outer contour of the upper section is provided with a plurality of first bottom holes which are located at the bottom and distributed along a straight line and a plurality of second smooth surface holes which are located at the upper part and distributed along an arc line; a first blasting group is arranged inside the upper section, a plurality of layers of auxiliary blasting groups expanding outwards layer by layer are arranged outside the first blasting group, a plurality of blasting holes are formed in the first blasting group and the auxiliary blasting groups, the lowest blasting hole in each layer of auxiliary blasting group is located at the same height, and the principle of multiple holes, shallow holes, explosive dosage control and multi-section blasting is followed; the explosive quantity and the detonation interval are strictly controlled, damage to surrounding rocks is reduced to a large extent, the stability of a tunnel face is enhanced, the smooth detonation effect is outstanding in the stratum with complex geological conditions, especially with broken surrounding rocks, disturbance of detonation to the surrounding rocks is reduced, the safety of engineering construction is improved, and engineering investment is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel blasting, in particular to a weak blasting blasthole arrangement structure for a high-in-situ stress soft rock large-deformation tunnel. Background Art

[0002] With the development of the domestic economy, underground space has been increasingly developed and utilized, and tunnels play an important role in water conservancy, transportation and other fields. Some of the tunnels face extremely complex geological conditions, including large deformation of soft rocks with high ground stress, crossing faults, rock mass crushing, etc., which pose technical challenges to tunnel blasting.

[0003] At present, drilling and blasting construction has been widely used in tunnel excavation due to its fast construction speed and strong adaptability to geological conditions. However, in tunnels with soft surrounding rocks, the traditional large-section blasting excavation method uses a large amount of explosives in a single blast, and the blasting vibration generated has a great disturbance to the surrounding rock, which can induce surrounding rock damage and endanger the stability of the surrounding rock and the support effect. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a weak blasting blasthole layout structure for a high-ground stress soft rock large deformation tunnel, which can solve the problem that the traditional large-section blasting excavation method in a soft surrounding rock tunnel is prone to induce surrounding rock damage and endanger the surrounding rock stability and support effect.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] A weak blasting blasthole arrangement structure for a high-in-situ stress soft rock large deformation tunnel, wherein the tunnel face is divided into an upper section and a lower section, wherein the outer contour of the upper section is provided with a plurality of first bottom holes distributed along a straight line at the bottom and a plurality of second smooth holes distributed along an arc at the upper part, wherein the hole depth direction of the second smooth holes is inclined toward the outer side of the tunnel face, wherein a first blasting group is provided inside the upper section, wherein a plurality of layers of auxiliary blasting groups expanding outward layer by layer are provided outside the first blasting group, wherein a plurality of blasting holes are provided in both the first blasting group and the auxiliary blasting group, wherein the blasting holes located at the bottom in each layer of the auxiliary blasting group are at the same height, and the hole depths of all the blasting holes are less than 1.5 m.

[0007] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The first blasting group is close to the bottom of the upper section, and a plurality of blasting holes in the first blasting group are distributed in a diamond shape and all of the blasting holes are located below the center of the upper section.

[0009] The blasting holes in the first blasting group and the blasting holes in each layer of the auxiliary blasting group are symmetrically distributed about the central axis of the upper section.

[0010] The auxiliary blasting group includes a first auxiliary blasting group and a second auxiliary blasting group. The plurality of blasting holes in the first auxiliary blasting group are distributed in a rectangular shape, and the plurality of blasting holes in the second auxiliary blasting group are distributed in a rectangular shape with bottom openings.

[0011] The auxiliary blasting group also includes a third auxiliary blasting group, a fourth auxiliary blasting group and a fifth auxiliary blasting group. The several blasting holes in the third auxiliary blasting group are respectively distributed in vertical straight lines on both sides of the second auxiliary blasting group, the several blasting holes in the fourth auxiliary blasting group are respectively distributed in vertical straight lines on both sides of the third auxiliary blasting group, and the several blasting holes in the fifth auxiliary blasting group are distributed in horizontal straight lines above the second auxiliary blasting group.

[0012] The auxiliary blasting group also includes a sixth auxiliary blasting group and a seventh auxiliary blasting group. The several blasting holes in the sixth auxiliary blasting group and the several blasting holes in the seventh auxiliary blasting group are all distributed in an arc shape, and the seventh auxiliary blasting group is located between the second polishing hole and the sixth auxiliary blasting group. The first auxiliary blasting group to the fifth auxiliary blasting group are all located on the inner side of the sixth auxiliary blasting group.

[0013] The plurality of blasting holes distributed along the transverse straight line of the rectangle in the first auxiliary blasting group are centripetal blasting holes, and the hole depths of the centripetal blasting holes are inclined toward the center of the transverse straight line of the rectangle where the centripetal blasting holes are located.

[0014] A plurality of side wall glass fiber anchor rods are inserted into the side wall of the upper section. The height of the side wall glass fiber anchor rods is the same as the height of the lowest blasting holes in each layer of the auxiliary blasting group. The side wall glass fiber anchor rods are arranged in the horizontal direction.

[0015] The lower section is provided with an inverted trapezoidal middle groove, a second blasting group is provided at the bottom of the middle groove, a plurality of blasting holes distributed along the horizontal straight line direction are provided in the second blasting group, a plurality of bottom holes distributed along the arc line of its bottom are provided at the outer contour of the lower section, a plurality of lower section smooth holes are provided at both ends of the bottom hole, a first groove group and a second groove group are provided in sequence between the middle groove and the bottom hole, a plurality of blasting holes distributed in an arc shape are provided in the first groove group and the second groove group respectively.

[0016] A plurality of downwardly inserted glass fiber anchor rods are respectively inserted into the two side walls of the middle groove, and the downwardly inserted glass fiber anchor rods are arranged to be inclined downward, and the inclination of the downwardly inserted glass fiber anchor rods to the horizontal direction is 30°~45°.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects: it follows the principles of multiple holes, shallow holes, controlled explosive dosage, and multi-stage detonation, strictly controls the amount of explosives and the detonation interval, minimizes the damage to the surrounding rock, and enhances the stability of the face; the middle groove excavated in the lower section can reduce the loss of pyrotechnics and the generation of harmful gases, and the insertion of glass fiber anchor rods can improve the stability of the face; in complex geological conditions, especially in strata with broken surrounding rocks, the light blasting effect is outstanding, the disturbance of blasting to the surrounding rock is reduced, the safety of engineering construction is improved, and engineering investment is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the upper section of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional hole depth at AA in the middle.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the lower section of the utility model.

[0021] Figure 4 for Figure 1 Schematic diagram of the distribution of glass fiber anchor rods in the side wall in the AA direction. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0024] The utility model provides a weak blasting blasthole arrangement structure for a high-ground stress soft rock large deformation tunnel. A tunnel face 1 is divided into an upper section and a lower section. A plurality of first bottom holes 11 located at the bottom and distributed along a straight line and a plurality of second smooth holes 10 located at the upper part and distributed along an arc are arranged at the outer contour of the upper section. The hole depth direction of the second smooth holes 10 is inclined toward the outer side of the tunnel face 1. A first blasting group is arranged inside the upper section. A first blasting group 2 is arranged inside the upper section. Several layers of auxiliary blasting groups that expand outward layer by layer are arranged outside the first blasting group 2. Several blasting holes are arranged in the first blasting group 2 and the auxiliary blasting group. The blasting holes located at the bottom in each layer of the auxiliary blasting group are at the same height. The hole depths of all the blasting holes are less than 1.5m.

[0025] The number and distribution of the first bottom hole 11, the second smooth hole 10, and the blasting holes in the auxiliary blasting group can be referred to in the attached Figure 1 Or it can be arranged according to the actual construction situation, which will not be elaborated here.

[0026] In this embodiment, the hole spacing between two adjacent second polished holes 10 is 50 cm, and the hole spacing between two adjacent first bottom holes 11 is 125 cm;

[0027] The included angle between the second smooth surface 10 and the tunnel heading face 1 is 60°-70°.

[0028] The first blasting group 2 is close to the bottom of the upper section. Several blasting holes in the first blasting group 2 are distributed in a diamond shape and all of the blasting holes are located below the center of the upper section.

[0029] In this embodiment, four blasting holes are provided in the first blasting group 2, and the four blasting holes are respectively arranged at the four ends of the rhombus. The distance between the lowest blasting hole and the first bottom hole 11 directly below it is 145 cm, the distance between the upper and lower blasting holes is 150 cm, and the distance between the left and right blasting holes is 134 cm.

[0030] The blasting holes in the first blasting group 2 and the blasting holes in each layer of the auxiliary blasting group are symmetrically distributed about the central axis of the upper section.

[0031] The auxiliary blasting group includes a first auxiliary blasting group 3 and a second auxiliary blasting group 4. The blasting holes in the first auxiliary blasting group 3 are distributed in a rectangular shape, and the blasting holes in the second auxiliary blasting group 4 are distributed in a rectangular shape with bottom openings.

[0032] In this embodiment, the spacing between the blasting holes distributed along the vertical straight line direction of the rectangle in the first auxiliary blasting group 3 is 100 cm.

[0033] The plurality of blasting holes distributed along the transverse straight line of the rectangle in the first auxiliary blasting group 3 are centripetal blasting holes 12 , and the hole depth of the centripetal blasting hole 12 is inclined toward the center of the transverse straight line of the rectangle where the centripetal blasting hole 12 is located.

[0034] In this embodiment, two centripetal blasting holes 12 are respectively provided in the upper and lower directions of the first auxiliary blasting group 3, the angle between the centripetal blasting hole 12 and the tunnel face 1 is 60°~70°, and the distance between the two centripetal blasting holes 12 on the same straight line is 134 cm;

[0035] The spacing between the blasting holes distributed along the vertical straight line direction of the rectangle in the second auxiliary blasting group 4 is 140 cm, and the spacing between the blasting holes distributed along the horizontal straight line direction of the rectangle is 150 cm;

[0036] The distance between the first auxiliary blasting group 3 and the second auxiliary blasting group 4 is 105 cm.

[0037] The auxiliary blasting group also includes a third auxiliary blasting group 5, a fourth auxiliary blasting group 6 and a fifth auxiliary blasting group 7. The several blasting holes in the third auxiliary blasting group 5 are distributed in vertical straight lines on both sides of the second auxiliary blasting group 4, the several blasting holes in the fourth auxiliary blasting group 6 are distributed in vertical straight lines on both sides of the third auxiliary blasting group 5, and the several blasting holes in the fifth auxiliary blasting group 7 are distributed in horizontal straight lines above the second auxiliary blasting group 4.

[0038] In this embodiment, the spacing between the blasting holes in the third auxiliary blasting group 5 and the fourth auxiliary blasting group 6 is 150 cm, and the spacing between the blasting holes in the fifth auxiliary blasting group 7 is 120 cm;

[0039] The distance between the second auxiliary blasting group 4 and the third auxiliary blasting group 5, and the distance between the third auxiliary blasting group 5 and the fourth auxiliary blasting group 6 are both 100 cm.

[0040] The auxiliary blasting group also includes a sixth auxiliary blasting group 8 and a seventh auxiliary blasting group 9. The several blasting holes in the sixth auxiliary blasting group 8 and the several blasting holes in the seventh auxiliary blasting group 9 are all distributed in an arc shape, and the seventh auxiliary blasting group 9 is located between the second polishing hole 10 and the sixth auxiliary blasting group 8. The first auxiliary blasting group 3 to the fifth auxiliary blasting group 7 are all located on the inner side of the sixth auxiliary blasting group 8.

[0041] In this embodiment, the spacing between the blasting holes in the sixth auxiliary blasting group 8 is 130 cm, and the spacing between the blasting holes in the seventh auxiliary blasting group 8 is 140 cm;

[0042] The distance between the lowest blasting hole in the fourth auxiliary blasting group 6 and the lowest blasting hole in the sixth auxiliary blasting group 8 is 100 cm;

[0043] The distance between the sixth auxiliary blasting group 8 and the seventh auxiliary blasting group 9 is 100 cm.

[0044] A plurality of side wall glass fiber anchor rods 20 are inserted into the side wall of the upper section. The side wall glass fiber anchor rods 20 are at the same height as the lowest blasting hole in each auxiliary blasting group. The side wall glass fiber anchor rods 20 are arranged in the horizontal direction.

[0045] In this embodiment, the length of the side wall glass fiber anchor rods 20 is 5 m, the spacing is 160 cm, and the external insertion angle is 30°-45°.

[0046] The lower section is provided with an inverted trapezoidal middle groove 13, and a second blasting group 15 is provided at the bottom of the middle groove 13. The second blasting group 15 is provided with a plurality of blasting holes distributed along the horizontal straight line direction, and the outer contour of the lower section is provided with a plurality of bottom holes 18 distributed along the arc line of its bottom, and a plurality of lower section smooth holes 19 are respectively provided at both ends of the bottom hole 18. A first groove group 16 and a second groove group 17 are sequentially provided between the middle groove 13 and the bottom hole 18, and a plurality of blasting holes distributed in an arc shape are respectively provided in the first groove group 16 and the second groove group 17.

[0047] In this embodiment, the height of the middle trench 13 is about half of the height of the lower section, the slope of both sides is about 2:1, 3m is reserved on both sides, and the excavation depth of one side of the middle trench is 2m;

[0048] The spacing between the blasting holes in the second blasting group 15 is 120cm~140cm, the spacing between the blasting holes in the first groove group 16 is 120cm~140cm, the spacing between the blasting holes in the second groove group 17 is 120cm~130cm, the spacing between the bottom holes 18 is 50cm~60cm, and the spacing between the lower section smooth holes 19 is 40cm~50cm. The number of the lower section smooth holes 19 is selected according to the actual construction conditions to ensure that the blasting contour line is smooth;

[0049] The distance between the second blasting group 15 and the first trenching group 16 is 100 cm, the distance between the first trenching group 16 and the second trenching group 17 is 80 cm, and the distance between the second trenching group 17 and the bottom hole 18 is 50 cm.

[0050] A plurality of downwardly inserted glass fiber anchor rods 14 are respectively inserted into the two side walls of the middle groove 13. The downwardly inserted glass fiber anchor rods 14 are arranged to be inclined downward, and the inclination of the downwardly inserted glass fiber anchor rods 14 to the horizontal direction is 30°-45°.

[0051] In this embodiment, the length of the inserted glass fiber anchor rod 14 is 5 m, and the specific number is determined according to the depth of the middle groove 13 .

[0052] In this embodiment, the angles between all blasting holes in the auxiliary blasting group and the tunnel face 1 are 90°, and the allowable angle error is 2°.

[0053] In this embodiment, all holes are 1m deep, and blasting is performed at intervals according to the milliseconds marked near each circular hole in the accompanying drawings. For example, 1(-) is marked near the four blasting holes in the first blasting group 2 in the accompanying drawings, indicating that the four blasting holes are blasted at 1 millisecond.

[0054] The construction steps of the utility model of a weak blasting blasthole arrangement structure for a high ground stress soft rock large deformation tunnel are as follows:

[0055] Step 1, upper section drilling: the upper section is arranged from outside to inside in sequence: the first bottom hole 11, the second smooth hole 10, the sixth auxiliary blasting group 8 and the seventh auxiliary blasting group 9, the fifth auxiliary blasting group 7, the fourth auxiliary blasting group 6, the third auxiliary blasting group 5, the second auxiliary blasting group 4, the first auxiliary blasting group 3, and the first blasting group 2;

[0056] Step 2: Clean the drill hole: Use a high-pressure water gun to clean the drill hole;

[0057] Step 3: Charge and connect: Place explosives and detonators in the boreholes. The order of charge is from top to bottom, from both sides to the middle. Connect each borehole in series to form a node at the central axis.

[0058] Step 4: Safety check and detonation: Set up the safety cordon strictly as required, ensure that irrelevant personnel retreat to the cordon, and detonate after confirming that the safety detonation conditions are met;

[0059] Step 5: Detonation sequence: strictly follow Figure 1 Each drill hole will be detonated in the milliseconds indicated next to it, and holes with the same number will be detonated simultaneously;

[0060] Step 6: Smoke exhaust and inspection: Ventilate and exhaust smoke for 30 minutes to ensure that the oxygen content and toxic and harmful gases meet the relevant standards, then check whether there is a blind shot. If there is a blind shot, re-detonate it and collect and destroy the remaining explosives;

[0061] Step 7: Excavation of the middle groove of the lower section: Mechanical excavation of the lower section along the middle groove;

[0062] Step 8, pre-reinforcement: set the lower glass fiber anchor rod 14 to pre-reinforce the side of the middle groove, and set the side wall glass fiber anchor rod 20 to pre-reinforce both sides of the side wall;

[0063] Step 9, drilling holes in the lower section: the lower section is provided with bottom holes 18, lower section smooth holes 19, the second groove group 17, the first groove group 16, and the second blasting group 15 in sequence from the outside to the inside;

[0064] Step 10: Clean the drill hole: Use a high-pressure water gun to clean the drill hole on the lower section;

[0065] Step 11, charging and connecting: Place explosives and detonators in the lower section boreholes. The charging order is from top to bottom, from both sides to the middle. Connect each borehole in series to form a node at the center axis.

[0066] Step 12: Safety check and detonation: Set up the safety cordon strictly as required, ensure that irrelevant personnel retreat to the cordon, and detonate after confirming that the safety detonation conditions are met;

[0067] Step 13: Detonation sequence: strictly follow Figure 3 Each blast hole will detonate in the milliseconds indicated next to it, and blast holes with the same number will detonate at the same time;

[0068] Step 14: Smoke exhaust and inspection: Ventilate and exhaust smoke for 30 minutes to ensure that the oxygen content and toxic and harmful gases meet the relevant standards, then check whether there is a blind shot. If there is a blind shot, re-detonate it and collect and destroy the remaining explosives;

[0069] Step 15: Slag removal and risk elimination: Use vehicles to transport the slag produced by blasting and excavation, and organize professionals to conduct risk elimination inspections;

[0070] Step 16: Inspection: Check the molding situation against the drawings and adjust the blasting parameters;

[0071] Step 17: Support: Support the tunnel according to the construction design drawings.

[0072] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the high-stress soft rock large-deformation tunnel weak blasting blasthole layout structure of the utility model, and can produce the positive effects recorded in the utility model.

[0073] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0074] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

[0075] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and affect variations to the disclosed embodiments by studying the drawings, disclosure, and appended claims. In addition, in the claims and the specification, words such as "comprises", "comprising", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0076] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A weak blasting blasthole arrangement structure for a high-in-situ stress soft rock large deformation tunnel, comprising a tunnel face (1), characterized in that: The tunnel face (1) is divided into an upper section and a lower section. The outer contour of the upper section is provided with a plurality of first bottom holes (11) located at the bottom and distributed along a straight line, and a plurality of second smooth holes (10) located at the top and distributed along an arc line. The hole depth direction of the second smooth holes (10) is inclined toward the outside of the tunnel face (1). A first blasting group (2) is provided inside the upper section. A plurality of layers of auxiliary blasting groups are provided outside the first blasting group (2) and are gradually expanded outward. A plurality of blasting holes are provided in the first blasting group (2) and the auxiliary blasting groups. The blasting holes located at the bottom of each layer of the auxiliary blasting group are at the same height. The hole depths of all blasting holes are less than 1.5 m.

2. A high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure as claimed in claim 1, characterized in that: The first blasting group (2) is close to the bottom of the upper section, and a plurality of blasting holes in the first blasting group (2) are distributed in a rhombus shape, and all of the blasting holes are located below the center of the upper section.

3. The high-stress soft rock large deformation tunnel weak blasting blasthole layout structure according to claim 1, characterized in that: The blasting holes in the first blasting group (2) and the blasting holes in each layer of the auxiliary blasting group are symmetrically distributed about the central axis of the upper section.

4. The high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure according to claim 1, characterized in that: The auxiliary blasting group comprises a first auxiliary blasting group (3) and a second auxiliary blasting group (4), wherein the plurality of blasting holes in the first auxiliary blasting group (3) are distributed in a rectangular shape, and the plurality of blasting holes in the second auxiliary blasting group (4) are distributed in a rectangular shape with bottom openings.

5. A weak blasting blasthole arrangement structure for high ground stress soft rock large deformation tunnel as claimed in claim 4, characterized in that: The auxiliary blasting group further comprises a third auxiliary blasting group (5), a fourth auxiliary blasting group (6) and a fifth auxiliary blasting group (7), wherein the plurality of blasting holes in the third auxiliary blasting group (5) are respectively arranged in a vertical straight line on both sides of the second auxiliary blasting group (4), the plurality of blasting holes in the fourth auxiliary blasting group (6) are respectively arranged in a vertical straight line on both sides of the third auxiliary blasting group (5), and the plurality of blasting holes in the fifth auxiliary blasting group (7) are arranged in a horizontal straight line above the second auxiliary blasting group (4).

6. A high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure as claimed in claim 5, characterized in that: The auxiliary blasting group further comprises a sixth auxiliary blasting group (8) and a seventh auxiliary blasting group (9), the plurality of blasting holes in the sixth auxiliary blasting group (8) and the plurality of blasting holes in the seventh auxiliary blasting group (9) are all distributed in an arc shape, and the seventh auxiliary blasting group (9) is located between the second polishing hole (10) and the sixth auxiliary blasting group (8), and the first auxiliary blasting group (3) to the fifth auxiliary blasting group (7) are all located on the inner side of the sixth auxiliary blasting group (8).

7. The high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure according to claim 4, characterized in that: The plurality of blasting holes distributed along the transverse straight line of the rectangle in the first auxiliary blasting group (3) are centripetal blasting holes (12), and the hole depths of the centripetal blasting holes (12) are inclined toward the center of the transverse straight line of the rectangle in which they are located.

8. The high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure according to claim 1, characterized in that: A plurality of side wall glass fiber anchor rods (20) are inserted into the side wall of the upper section, the side wall glass fiber anchor rods (20) are located at the same height as the lowest blasting hole in each layer of the auxiliary blasting group, and the side wall glass fiber anchor rods (20) are arranged in the horizontal direction.

9. The high-stress soft rock large deformation tunnel weak blasting blasthole arrangement structure according to claim 1, characterized in that: The lower section is provided with an inverted trapezoidal middle groove (13), a second blasting group (15) is provided at the bottom of the middle groove (13), a plurality of blasting holes distributed along a transverse straight line direction are provided in the second blasting group (15), a plurality of bottom holes (18) distributed along an arc line of the bottom are provided at the outer contour of the lower section, a plurality of lower section smooth holes (19) are provided at both ends of the bottom hole (18), a first groove group (16) and a second groove group (17) are provided in sequence between the middle groove (13) and the bottom hole (18), a plurality of blasting holes distributed in an arc shape are provided in the first groove group (16) and the second groove group (17), respectively.

10. A weak blasting blasthole arrangement structure for high ground stress soft rock large deformation tunnel according to claim 9, characterized in that: A plurality of downwardly inserted glass fiber anchor rods (14) are respectively inserted into the two side walls of the middle groove (13); the downwardly inserted glass fiber anchor rods (14) are arranged to be inclined downward, and the inclination of the downwardly inserted glass fiber anchor rods (14) to the horizontal direction is 30° to 45°.

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