CN111502762A - Blasting damage detection method based on small-spacing cavern group - Google Patents
Blasting damage detection method based on small-spacing cavern group Download PDFInfo
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- CN111502762A CN111502762A CN202010335023.3A CN202010335023A CN111502762A CN 111502762 A CN111502762 A CN 111502762A CN 202010335023 A CN202010335023 A CN 202010335023A CN 111502762 A CN111502762 A CN 111502762A
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- 238000005422 blasting Methods 0.000 title claims abstract description 74
- 238000001514 detection method Methods 0.000 title claims abstract description 69
- 238000004880 explosion Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 abstract description 19
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005474 detonation Methods 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- Geochemistry & Mineralogy (AREA)
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- General Health & Medical Sciences (AREA)
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- Immunology (AREA)
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- Chemical & Material Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A blasting damage detection method based on small-spacing cavern groups comprises the following steps: s1: respectively arranging detection holes on the explosion-facing side walls of the two side tunnel sections; s2: arranging an ultrasonic detector in the detection hole; s3: starting an ultrasonic detector for pre-explosion detection; s4: blasting in at least two modes in the middle hole section, and starting an ultrasonic detector after each blasting to perform post-blasting detection; s5: comparing the detection data after each blasting with the detection data of the last blasting; s6: and selecting a blasting mode with small damage by comparing results to perform subsequent blasting of the small-distance cavern group. The detection method has the advantages of simple and convenient operation, capability of ensuring the stability of the underground rock engineering structure and capability of improving the construction safety.
Description
Technical Field
The invention mainly relates to a blasting technology of small-spacing cavern groups, in particular to a blasting damage detection method based on the small-spacing cavern groups.
Background
The Badailing great wall station is positioned in a new Badailing tunnel, the total length of the station is 470m, the underground building area of the station is 3.6 ten thousand square meters, the buried depth of a rail surface is 102m, and the lifting height of passengers is 62m, so that the station is a high-speed railway underground station with the largest buried depth and lifting height in China at present; the station has multiple levels, large number of chambers and complex tunnel types, and is the most complex underground excavation tunnel group station in China at present. The three layers of the station underground structure are respectively a station platform layer, an entrance channel layer, an exit channel layer and an equipment cavern, wherein the horizontal distance between three-hole separation mark tunnel sections of the station platform layer is 2.23-6 m at most; the vertical distance between the station platform layer and the station in-out channel layer is 4.55 m; the clear distance between the entrance and exit building escalator channels is 4.14-3.78 m.
The rock drilling blasting technology is widely applied in the tunnel excavation process, but the blasting excavation causes the rock mass in an explosion area to be broken and stripped, and meanwhile, the disturbance and the damage to the reserved surrounding rock are also inevitable, so that the mechanical property of the rock mass is deteriorated, the strength is reduced, the integrity is poor, the stability of the underground rock mass engineering structure is greatly weakened, and since the safety accidents are not few due to the fact that the blasting is not considered to detect the surrounding rock damage, how to effectively detect the blasting surrounding rock damage is achieved, and therefore, the establishment of an effective solution is very important.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the blasting damage detection method based on the small-spacing cavern group, which is simple and convenient to operate, can ensure the stability of the underground rock engineering structure and can improve the construction safety.
In order to solve the technical problems, the invention adopts the following technical scheme:
a small-spacing cavern group blasting damage detection method is based on, the small-spacing cavern group comprises tunnel sections at two ends and a middle three-hole separation section, a large-span section is connected between the three-hole separation section and the tunnel section at the corresponding end, and the three-hole separation section comprises a middle hole section and side hole sections at two sides; the detection method comprises the following steps:
s1: respectively arranging detection holes on the explosion-facing side walls of the two side tunnel sections;
s2: arranging an ultrasonic detector in the detection hole;
s3: starting an ultrasonic detector for pre-explosion detection;
s4: blasting in at least two modes in the middle hole section, and starting an ultrasonic detector after each blasting to perform post-blasting detection;
s5: comparing the detection data after each blasting with the detection data of the last blasting;
s6: and selecting a blasting mode with small damage by comparing results to perform subsequent blasting of the small-distance cavern group.
As a further improvement of the above technical solution:
in step S1, the hole depth of the detection hole is set to 5 m.
In step S1, the distance from the inspection hole of one side hole segment to the face is set to 10m, and the distance from the inspection hole of the other side hole segment to the face is set to 20 m.
The drilling direction of the detection hole is set to be 3-5 degrees to the horizontal line.
In step S5, blasting is performed by using a non-electric detonator and an electronic detonator.
In step S4, each blasting method is continued a plurality of times.
Compared with the prior art, the invention has the advantages that:
the method comprises the steps of carrying out pre-explosion detection on the explosion facing sides of two side tunnel sections through ultrasonic waves to obtain pre-explosion surrounding rock data, then carrying out explosion in at least two modes in a middle tunnel section to obtain surrounding rock data of each explosion mode after each explosion, obtaining surrounding rock damage data by comparing the detection data after each explosion with the detection data of the last explosion, and then carrying out subsequent explosion of the small-spacing cavern group by selecting the explosion mode with small damage through the comprehensive comparison result. The method effectively detects the damage of the blasting surrounding rock, can select the blasting mode suitable for small-spacing cavern groups according to the detection result, ensures the stability of the underground rock engineering structure on the one hand, improves the construction safety on the other hand, and is simple and convenient to operate.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
FIG. 2 is a schematic top view of a group of small-pitch holes in accordance with the present invention.
FIG. 3 is a schematic top view of a three-hole separation section according to the present invention.
FIG. 4 is a schematic front view of a three-hole separation section according to the present invention.
FIG. 5 is a graph of the velocity of a detonation wave at a detection aperture in the present invention.
FIG. 6 is a graph of the velocity of a detonation wave at another test hole in the present invention.
FIG. 7 is a graph of post-detonation velocity for a test hole non-electrical squib in accordance with the present invention.
FIG. 8 is a graph of post-detonation velocity for another manhole non-electrical detonator according to the present invention.
FIG. 9 is a graph of the post-detonation wave velocity of a test hole electronic detonator of the present invention.
Fig. 10 is a graph of post-detonation velocity for another manhole electronic detonator according to the present invention.
The reference numerals in the figures denote:
1. a tunnel segment; 2. a three-hole separation section; 21. a middle hole section; 22. a side hole section; 221. a detection hole; 3. a large span segment.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
Fig. 1 to 10 show an embodiment of a small-distance cavern group blasting damage detection method according to the present invention, the small-distance cavern group includes two tunnel sections 1 at two ends and a middle three-hole separation section 2, a large-span section 3 is connected between the three-hole separation section 2 and the corresponding tunnel section 1, and the three-hole separation section 2 includes a middle-hole section 21 and two side-hole sections 22; the detection method comprises the following steps:
s1: detection holes 221 are respectively formed in the explosion-facing side walls of the two side tunnel sections 22;
s2: an ultrasonic detector is arranged in the detection hole 221;
s3: starting an ultrasonic detector for pre-explosion detection;
s4: blasting in at least two modes in the middle hole section 21, and starting an ultrasonic detector to perform post-blasting detection after each blasting;
s5: comparing the detection data after each blasting with the detection data of the last blasting;
s6: and selecting a blasting mode with small damage by comparing results to perform subsequent blasting of the small-distance cavern group.
By adopting the method, the front blasting side of the two side tunnel sections 22 is detected by ultrasonic waves to obtain the front blasting wall rock data, then blasting is carried out in at least two modes in the middle tunnel section 21 to obtain the wall rock data of each blasting mode after each blasting, the wall rock damage data is obtained by comparing the detection data after each blasting with the detection data of the last blasting, and then the blasting mode with small damage is selected by comprehensively comparing the results to carry out the subsequent blasting of the small-distance cavern group. The method effectively detects the damage of the blasting surrounding rock, can select the blasting mode suitable for small-spacing cavern groups according to the detection result, ensures the stability of the underground rock engineering structure on the one hand, improves the construction safety on the other hand, and is simple and convenient to operate.
In the present embodiment, in step S1, the hole depth of the detection hole 221 is set to 5 m. Set up like this, guarantee on the one hand that inspection hole 221 is close to well hole section 21, improved the accuracy that detects, on the other hand, inspection hole 221 can also act as detonation pressure release hole, has further improved the security.
In this embodiment, in step S1, the distance from the inspection hole 221 of one side hole segment 22 to the face is set to 10m, and the distance from the inspection hole 221 of the other side hole segment 22 to the face is set to 20 m. The positions of the two detection holes 221 are staggered, and a certain distance is formed between the detection holes and the palm surface, which is equivalent to extending the detection area while ensuring the detection accuracy.
In this embodiment, the drilling direction of the inspection hole 221 is set to 3 ° to 5 ° from the horizontal. The arrangement is convenient for irrigation during detection and is more beneficial to ultrasonic detection
In this embodiment, in step S5, blasting is performed by using a non-electrical detonator and an electronic detonator. It is convenient to operate and safe to use.
In this embodiment, in step S4, each blasting method is continuously performed a plurality of times. The continuous multiple blasting is beneficial to the optimization of data samples, so that the detection result is more comprehensive and accurate.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. A small-spacing cavern group-based blasting damage detection method is characterized in that the small-spacing cavern group comprises tunnel sections (1) at two ends and a middle three-hole separation section (2), a large-span section (3) is connected between the three-hole separation section (2) and the tunnel section (1) at the corresponding end, and the three-hole separation section (2) comprises a middle hole section (21) and side hole sections (22) at two sides; the detection method comprises the following steps:
s1: detection holes (221) are respectively formed in the explosion-facing side walls of the two side tunnel sections (22);
s2: an ultrasonic detector is arranged in the detection hole (221);
s3: starting an ultrasonic detector for pre-explosion detection;
s4: blasting in at least two modes in the middle hole section (21), and starting an ultrasonic detector to perform post-blasting detection after each blasting;
s5: comparing the detection data after each blasting with the detection data of the last blasting;
s6: and selecting a blasting mode with small damage by comparing results to perform subsequent blasting of the small-distance cavern group.
2. The blasting damage detection method based on small-distance cavern group as claimed in claim 1, wherein the blasting damage detection method comprises the following steps: in step S1, the hole depth of the detection hole (221) is set to 5 m.
3. The small-pitch cavern group-based blasting damage detection method as recited in claim 2, wherein the small-pitch cavern group-based blasting damage detection method comprises the following steps: in step S1, the distance from the inspection hole (221) of one side hole segment (22) to the face is set to 10m, and the distance from the inspection hole (221) of the other side hole segment (22) to the face is set to 20 m.
4. The small-pitch cavern group-based blasting damage detection method as recited in claim 3, wherein the small-pitch cavern group-based blasting damage detection method comprises the following steps: the drilling direction of the detection hole (221) is set to be 3-5 degrees with the horizontal line.
5. The small-pitch cavern group-based blasting damage detection method as claimed in any one of claims 1 to 4, wherein the small-pitch cavern group-based blasting damage detection method comprises the following steps: in step S5, blasting is performed by using a non-electric detonator and an electronic detonator.
6. The small-pitch cavern group-based blasting damage detection method as claimed in any one of claims 1 to 4, wherein the small-pitch cavern group-based blasting damage detection method comprises the following steps: in step S4, each blasting method is continued a plurality of times.
7. The blasting damage detection method based on small-distance cavern group as claimed in claim 5, wherein the blasting damage detection method comprises the following steps: in step S4, each blasting method is continued a plurality of times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010335023.3A CN111502762A (en) | 2020-04-24 | 2020-04-24 | Blasting damage detection method based on small-spacing cavern group |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010335023.3A CN111502762A (en) | 2020-04-24 | 2020-04-24 | Blasting damage detection method based on small-spacing cavern group |
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| CN111502762A true CN111502762A (en) | 2020-08-07 |
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| CN202010335023.3A Pending CN111502762A (en) | 2020-04-24 | 2020-04-24 | Blasting damage detection method based on small-spacing cavern group |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837604A (en) * | 2014-03-17 | 2014-06-04 | 武汉大学 | Method for correcting span during rock blasting damage cross-hole sound wave test |
| CN104196537A (en) * | 2014-08-26 | 2014-12-10 | 广东省建筑工程机械施工有限公司 | Construction method of three parallel metro tunnels with ultra-small clear distance |
| CN107478523A (en) * | 2017-08-30 | 2017-12-15 | 北京市政建设集团有限责任公司 | The Blasting Vibration Velocity method of testing and system of dike among a kind of closely-spaced tunnel |
| CN108204236A (en) * | 2017-12-29 | 2018-06-26 | 中铁五局集团有限公司 | Pre -arranged layer tunnel piecemeal synchronous construction full face tunneling method |
-
2020
- 2020-04-24 CN CN202010335023.3A patent/CN111502762A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837604A (en) * | 2014-03-17 | 2014-06-04 | 武汉大学 | Method for correcting span during rock blasting damage cross-hole sound wave test |
| CN104196537A (en) * | 2014-08-26 | 2014-12-10 | 广东省建筑工程机械施工有限公司 | Construction method of three parallel metro tunnels with ultra-small clear distance |
| CN107478523A (en) * | 2017-08-30 | 2017-12-15 | 北京市政建设集团有限责任公司 | The Blasting Vibration Velocity method of testing and system of dike among a kind of closely-spaced tunnel |
| CN108204236A (en) * | 2017-12-29 | 2018-06-26 | 中铁五局集团有限公司 | Pre -arranged layer tunnel piecemeal synchronous construction full face tunneling method |
Non-Patent Citations (2)
| Title |
|---|
| HONGXIAN FU: "Comparison of Excavation Damage Zones Resulting from Blasting with Nonel Detonators and Blasting with Electronic Detonators", 《ROCK MECH ROCK ENG》 * |
| 张庆松等: "小间距隧道***动力特性试验研究", 《岩土力学》 * |
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