CN112832796B - TBM cutter head, TBM and hard rock cracking TBM tunneling method - Google Patents
TBM cutter head, TBM and hard rock cracking TBM tunneling method Download PDFInfo
- Publication number
- CN112832796B CN112832796B CN202110279806.9A CN202110279806A CN112832796B CN 112832796 B CN112832796 B CN 112832796B CN 202110279806 A CN202110279806 A CN 202110279806A CN 112832796 B CN112832796 B CN 112832796B
- Authority
- CN
- China
- Prior art keywords
- tbm
- fracturing
- rock
- cutter head
- operation opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011435 rock Substances 0.000 title claims abstract description 86
- 230000005641 tunneling Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005336 cracking Methods 0.000 title description 7
- 238000005553 drilling Methods 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
-
- 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
- E21D9/10—Making by using boring or cutting machines
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a TBM cutter head, a TBM and a hard rock fracturing TBM tunneling method. The TBM cutter comprises a cutter body, a drilling machine and a fracturing piece; an operation opening is arranged on the front end plate of the cutter head body and close to the center, and a sealing structure is detachably arranged on the operation opening; after the operation opening is opened, the drilling machine can carry out drilling operation through the operation opening so as to obtain the rock hole, and the piece that splits can stretch to in the rock hole through the operation opening. In order to carry out fracturing operation, the existing TBM cutter head is directly modified, and an operation opening is formed in the cutter head, so that an operation space for drilling and placing fracturing pieces is provided, and the TBM is suitable for fracturing operation of rock stratum tunnel tunneling engineering.
Description
Technical Field
The invention relates to the technical field of underground engineering construction, in particular to a TBM cutter head, a TBM and a hard rock fracturing TBM tunneling method.
Background
In rock stratum tunnel tunneling engineering, TBM tunneling machines are increasingly applied due to high mechanization degree, high tunneling speed, good forming quality and less stratum disturbance. However, due to the limitation of the rock breaking capability of the hob, in a section with high rock strength and good integrity, the TBM also has the disadvantages of large tool and energy consumption and low tunneling speed, which causes the construction period delay and the cost increase. To solve this problem, it is a major research direction to weaken the overall strength by generating a large number of cracks in advance in the rock mass in the heading direction of the tunnel face.
However, some existing fracturing operations are mainly used in open environments such as a tunnel roof and the like, and are difficult to be applied to rock stratum tunneling engineering.
Therefore, how to provide a fracturing operation suitable for rock formation tunneling engineering is a technical problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, the present invention provides a TBM cutter head, which can be applied to a fracturing operation in a rock formation tunneling project. The invention also aims to provide the TBM comprising the TBM cutterhead and the hard rock fracturing TBM tunneling method applying the TBM.
In order to achieve the purpose, the invention provides the following technical scheme:
a TBM cutter head comprises a cutter head body, a drilling machine and a fracturing piece;
an operation opening is formed in the front end plate of the cutter head body and is close to the center, and a sealing structure is detachably arranged on the operation opening;
after the operation opening is opened, the drilling machine can perform drilling operation through the operation opening to obtain a rock hole, and the fracturing piece can extend into the rock hole through the operation opening after the drilling machine is withdrawn from the operation opening.
Preferably, the cover structure is a detachable hob or a cover plate.
Preferably, the fracturing element comprises one of a perforating gun, an explosive, a liquid carbon dioxide fracturing element, a high energy combustion agent fracturing element, a static swelling agent fracturing element, and a hydraulic fracturing element.
Preferably, the fracturing element comprises a perforating gun, at least two perforating charges are sequentially arranged on the perforating gun along the axial direction, and the phase angle interval between the axially adjacent perforating charges is not more than 45 degrees.
Preferably, there are no fewer than 3 charges on the gun in the same phase.
A TBM includes as above TBM blade disc.
A hard rock fracturing TBM tunneling method is applied to the TBM;
the tunneling method comprises the following steps:
opening the operation opening, enabling the drilling machine to extend out of the operation opening, and drilling the hard rock to obtain a rock hole;
withdrawing the drilling rig from the access opening, and placing the fracturing element into the rock bore through the access opening;
controlling the cutter head body to rotate by a preset angle, so that the rock hole is covered by the cutter head body;
and starting the fracturing device to fracture the hard rock.
Preferably, after the fracturing element is placed into the rock bore through the operation opening and before the cutter head body is controlled to rotate by a preset angle, the method further comprises:
filling the rock bore with a first filler.
Preferably, control the rotatory preset angle of cutter head body makes the rock bore by behind the cutter head body closing cap, start the device that splits so that split before the hard rock, still include:
and filling a second filler in a gap between the cutter head body and the rock hole opening.
Preferably, after the starting the fracturing device to fracture hard rock, the method further comprises:
reversely rotating the cutter head body to reset, and extracting residues of the fracturing piece from the rock hole;
and installing the sealing cover structure on the operation opening, and entering a tunneling process.
The TBM cutter head provided by the invention comprises a cutter head body, a drilling machine and a cracking piece; an operation opening is arranged on the front end plate of the cutter head body and close to the center, and a sealing structure is detachably arranged on the operation opening; after the operation opening is opened, the drilling machine can carry out drilling operation through the operation opening so as to obtain a rock hole, and the fracturing piece can extend into the rock hole through the operation opening.
In order to carry out fracturing operation, the cutter head of the conventional TBM is directly transformed, and an operation opening is arranged on the cutter head so as to provide an operation space for drilling and placing fracturing pieces, so that the method is suitable for fracturing operation of rock stratum tunnel tunneling engineering.
The TBM comprising the TBM cutterhead and the hard rock fracturing TBM tunneling method applying the TBM can be suitable for fracturing operation of rock stratum tunnel tunneling engineering.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a TBM cutterhead provided by the present invention in a drilling position;
FIG. 2 is a schematic diagram of the position of a TBM cutterhead provided by the present invention when the cutterhead rotates to shield a rock hole before blasting;
FIG. 3 is a schematic view of the direction and extent of perforation;
FIG. 4 is a schematic illustration of a perforating gun configuration and insertion into a rock bore;
fig. 5 is a flowchart of the tunneling method provided by the present invention.
Reference numerals:
the cutter head comprises a cutter head body 1, an operation opening 2, a detachable hob cutter 3, a perforating gun 4 and a rock hole 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a TBM cutter head which can be suitable for cracking operation of rock stratum tunnel tunneling engineering. The invention also provides the TBM comprising the TBM cutterhead and the hard rock cracking TBM tunneling method applying the TBM.
In an embodiment of the TBM cutterhead provided by the present invention, please refer to fig. 1 to 4, which includes a cutterhead body 1, a drilling machine and a fracturing piece.
An operation opening 2 is formed in the front end plate of the cutter head body 1 and close to the center, and a sealing cover structure is detachably arranged on the operation opening 2. After the operation opening 2 is opened, the drilling machine can perform drilling operation through the operation opening 2 to obtain a rock hole 5, and after the drilling machine is withdrawn from the operation opening 2, the fracturing piece can extend into the rock hole 5 through the operation opening 2 and perform fracturing operation in the rock hole 5. Wherein the type of the drill hole is selected according to the requirement of the rock hole 5, and optionally, the drill is a drill with the drill hole diameter of about 102 mm.
In the embodiment, in order to perform fracturing operation, the cutter head of the TBM is directly transformed, and the operation opening 2 is arranged on the cutter head, so that an operation space for drilling and placing fracturing pieces is provided, and the method is suitable for fracturing operation of rock stratum tunnel tunneling engineering.
Further, the closing cap structure is for dismantling hobbing cutter 3, when sending and splits the operation, will dismantle hobbing cutter 3 and pull down in order to expose operation mouth 2, utilizes operation mouth 2 to drill, because there are other structures to block on the blade disc body 1 from top to bottom, can drill at horizontal position. During normal driving, the detachable hob 3 is mounted to cover the working opening 2. Of course, in other embodiments, the cover structure may also be provided as a cover plate.
Further, the fracturing element comprises a perforating gun 4, and the fracturing capacity is high.
Wherein, specifically, at least two perforating bullets are arranged on the perforating gun 4 along the axial direction, wherein the axial direction is the depth direction of the rock hole 5. The phase angle spacing between axially adjacent charges is no more than 45 deg. so that the charges can be fully fractured from each radial direction. More specifically, on the perforating gun 4, the number of the perforating bullets in the same phase is not less than 3, the caliber of the perforating bullets is not less than 38mm, the arrangement distance is not less than 40 perforating bullets per meter, and the total length of the gun body is smaller than the drilling depth, specifically 20-50 mm.
In the embodiment, a group of composite perforating bullets are inserted into the perforating guns 4 which are arranged and assembled at intervals according to a set distance and a set direction, a large number of net-shaped free surfaces are generated in a front rock body by utilizing a composite perforating and fracturing effect, the integrity of a rock stratum in a tunneling direction is reduced, the rock breaking efficiency is improved, the cutter loss and the energy loss are reduced, the fracturing range can be limited within a tunneling contour line by reasonably selecting the specifications of the perforating bullets, the strength and the integrity of surrounding rocks are ensured, and the supporting safety is improved.
Of course, in other embodiments, the fracturing elements may also include one of an explosive (e.g., an uncoupled charge of explosive, a strip of explosive with a focused cutting direction, a cartridge with a focused cutting direction, etc.), a liquid carbon dioxide fracturing element, a high energy combustion agent fracturing element, a static expansion agent fracturing element, a hydraulic fracturing element.
In addition to the above TBM cutterhead, the present invention also provides a TBM, which includes a TBM cutterhead, specifically, a TBM cutterhead provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly. For the structure of other parts of the TBM, please refer to the prior art, which is not described herein again.
Besides the TBM cutterhead and the TBM, the invention also provides a hard rock fracturing TBM tunneling method applying the TBM, which specifically comprises the following steps:
s1: opening the operation port 2, enabling the drilling machine to extend out through the operation port 2, performing drilling operation on hard rock and obtaining a rock hole 5, wherein the depth of the rock hole 5 is not less than one step changing distance;
s2: withdrawing the drilling machine from the operation opening 2, and placing the fracturing element into the rock hole 5 through the operation opening 2;
s3: as shown in fig. 2, the cutter head body 1 is controlled to rotate by a preset angle, so that the rock hole 5 is covered by the cutter head body 1;
s4: and starting the fracturing device to fracture the hard rock.
In this embodiment, utilize operation mouth 2 on the blade disc body 1, can realize sending and split the operation, simultaneously, send the in-process of splitting the operation, through rotating blade disc body 1, can the closing cap rock hole 5 to utilize the structure of blade disc body 1 itself, prevent collapse and flying stone that probably appear to the orifice, can reduce other protector's setting.
Further, after the fracturing element is placed into the rock hole 5 through the operation opening 2 in S2 and before S3, the method further comprises: the rock bore 5 is filled with a first filler, optionally stemming, filled between the breech and the bore.
Further, after S3 and before S4, the method further includes: a second filling, for example a sand bag, is filled in the gap between the cutterhead body 1 and the opening of the rock hole 5. Specifically, after the perforating gun 4 is completely inserted into the rock hole 5, the cutter head is rotated at a low speed, so that the drilling hole is completely shielded by the surface of the cutter head, a gap between the face of the hole and the surface of the cutter head is tightly filled with sand bags, and then a perforating bullet is detonated to cause cracking.
Further, after S4, the method further includes:
s5: the cutterhead body 1 is rotated in reverse to reposition and extract the fracturing element residue from the bore 5.
S6: and installing a sealing structure on the operation opening 2 and entering a tunneling process.
Specifically, after the cutter head body 1 is rotated reversely to expose the drilled hole, the remains of the perforating gun 4 are extracted, the detachable hob 3 is rotated back on the operation opening 2, and the TBM can recover the normal tunneling.
According to the tunneling method provided by the embodiment, the opening near the middle point of the radius of the existing TBM cutter head is used for drilling the working hole, a mature composite perforation technology is used for generating a large number of free surfaces weakening the overall strength in a rock mass, a large number of cracks can be quickly and safely generated in complete hard rock on the basis of not changing or slightly changing the existing TBM equipment, the overall strength of the rock mass in the tunneling direction of the tunnel face is effectively reduced, the tunneling speed is improved, the cutter and energy loss are reduced, the damage to the surrounding rock strength is reduced, and the supporting strength is ensured.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not 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 construed as limiting the invention. Furthermore, the terms "first", "second", "third" 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The TBM cutterhead, the TBM and the hard rock cracking TBM tunneling method provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A hard rock fracturing TBM tunneling method is characterized in that a TBM is applied and comprises a TBM cutter head, and the TBM cutter head comprises a cutter head body (1), a drilling machine and a fracturing piece; an operation opening (2) is formed in the front end plate of the cutter head body (1) close to the center and the radius midpoint, a sealing structure is detachably arranged on the operation opening (2), and the sealing structure is a detachable hob (3); after the operation opening (2) is opened, the drilling machine can perform drilling operation through the operation opening (2) to obtain a rock hole, and the fracturing element can extend into the rock hole through the operation opening (2) after the drilling machine is withdrawn from the operation opening (2); the fracturing element comprises perforating guns (4), at least two perforating bullets are sequentially arranged on the perforating guns (4) along the axial direction, the phase angle interval between the axially adjacent perforating bullets is not more than 45 degrees, and the perforating bullets can be completely fractured from all radial directions respectively;
the tunneling method comprises the following steps:
opening the operation opening (2), enabling the drilling machine to extend out through the operation opening (2), and drilling hard rock to obtain a rock hole;
withdrawing the drilling machine from the operation opening (2), and placing the fracturing element into the rock hole through the operation opening (2);
controlling the cutter head body (1) to rotate by a preset angle, so that the rock hole is covered by the cutter head body (1);
and starting the fracturing element to fracture the hard rock.
2. A hard rock fracturing TBM tunneling method according to claim 1, characterized by that on the perforating gun (4), not less than 3 of the perforating charges in the same phase.
3. The hard rock fracturing TBM tunneling method according to claim 1, wherein after the fracturing element is placed into the rock hole through the operation port (2) and before the cutterhead body (1) is controlled to rotate by a preset angle, the method further comprises the following steps:
filling the rock bore with a first filler.
4. The hard rock fracturing TBM tunneling method according to claim 1, wherein the controlling the cutterhead body (1) to rotate by a preset angle, so that after the rock hole is covered by the cutterhead body (1) and before the starting of the fracturing element to fracture hard rock, further comprises:
and filling a second filler in a gap between the cutter head body (1) and the rock hole opening.
5. The hard rock fracturing TBM tunneling method according to any one of claims 1 to 4, wherein after the starting of the fracturing element to fracture hard rock, the method further comprises the following steps:
reversely rotating the cutter head body (1) to reset, and extracting residues of the fracturing elements from the rock hole;
and installing the sealing cover structure on the operation opening (2) and entering a tunneling process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110279806.9A CN112832796B (en) | 2021-03-16 | 2021-03-16 | TBM cutter head, TBM and hard rock cracking TBM tunneling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110279806.9A CN112832796B (en) | 2021-03-16 | 2021-03-16 | TBM cutter head, TBM and hard rock cracking TBM tunneling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112832796A CN112832796A (en) | 2021-05-25 |
| CN112832796B true CN112832796B (en) | 2022-08-19 |
Family
ID=75930221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110279806.9A Active CN112832796B (en) | 2021-03-16 | 2021-03-16 | TBM cutter head, TBM and hard rock cracking TBM tunneling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112832796B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810117B (en) * | 2022-04-26 | 2023-01-10 | 中南大学 | Hard rock TBM based on hole array induced cracking modification, cutter head and tunneling method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3049135A1 (en) * | 1980-12-24 | 1982-07-15 | Hawera Probst Gmbh + Co, 7980 Ravensburg | DRILLS, ESPECIALLY DRILLING DRILLS |
| CN106761796B (en) * | 2016-11-22 | 2018-08-28 | 东北大学 | Microwave stress release device and application on a kind of TBM for rock-burst prevention |
| CN110259474B (en) * | 2019-07-02 | 2024-07-16 | 中国科学院武汉岩土力学研究所 | Double-hob hydraulic-mechanical TBM cutter head combined rock breaking method and tunneling equipment thereof |
| CN111058857B (en) * | 2019-12-13 | 2021-06-08 | 武汉大学 | Drilling and blasting auxiliary rock breaking composite full-face tunnel boring machine cutter head system |
| CN112483107B (en) * | 2020-11-04 | 2021-11-05 | 中国科学院武汉岩土力学研究所 | Inner and outer cutter TBM device based on pulse jet flow and point treatment |
-
2021
- 2021-03-16 CN CN202110279806.9A patent/CN112832796B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112832796A (en) | 2021-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108590688B (en) | A kind of TBM development machine and its tunneling construction method with hydraulic drill rig | |
| CN107764144A (en) | A kind of tunnel Millisecond Controlled Blasting method | |
| CN103123247A (en) | Damping blasting method for steep dip small crossing angle layered surrounding rock small-distance tunnel excavation | |
| CN110630181B (en) | Coal seam reaming and permeability increasing method utilizing pneumatic coupling effect | |
| CN103499255A (en) | Method for directional energy-gathered blasting of retaining wall with low damage | |
| CN110439586B (en) | Non-blasting type mine roadway water cutting tunneling method | |
| CN114542069B (en) | Upper-breaking and lower-cutting gob-side entry retaining blasting method for huge-thickness top plate | |
| CN104453898A (en) | Deep hole blasting and static water injecting combining coal seam weakening method | |
| CN112832796B (en) | TBM cutter head, TBM and hard rock cracking TBM tunneling method | |
| CN111521069A (en) | Carbon dioxide phase change directional pressure relief fracturing device for tunneling and use method thereof | |
| CN104819670A (en) | Pre-drilling mesopore shaft excavation blasting method | |
| CN108362179A (en) | A kind of energy saving cut shot method of star | |
| CN109945753A (en) | A kind of high methane full section of tunnel onepull construction method | |
| CN112983418A (en) | Method for hydraulic fracturing pressure relief of coal mine underground coal face withdrawal channel | |
| CN105021096A (en) | Five-segment-type millisecond electric detonator secondary blasting construction method applied to blasting of high-gas large-section tunnel | |
| CN103697775A (en) | Method of loose blasting by high-pressure water jet helical cutting | |
| AU2021102155A4 (en) | Safe and efficient construction method for deep hole vibration reduction blasting of deep shaft frozen bedrock | |
| CN110924398B (en) | High-strength rock slope widening excavation construction method under condition of traffic protection | |
| CN102787843A (en) | Dirt band-containing coal seam working surface mining process | |
| CN110940242B (en) | Blasting excavation method for deep crack containing slope rock mass | |
| CN209027381U (en) | A kind of blasting system for rock roadway in coal mine blast working | |
| CN111457804A (en) | Method for blasting IV-grade massive crushed rock with disordered development and wide fracture surface | |
| CN106813540A (en) | The method of Shaft Freezing rock section deep hole blasting under ultra low temperature state | |
| CN114935290B (en) | Pre-splitting blasting method for cutting single roadway and cutting deep hole on two sides of top-cutting retained roadway | |
| CN107228608B (en) | The blasting method of rock directional splitting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |