CN103322872B - A kind of method improving Long-hole Bench Blasting vibration frequency - Google Patents
A kind of method improving Long-hole Bench Blasting vibration frequency Download PDFInfo
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- CN103322872B CN103322872B CN201310252293.8A CN201310252293A CN103322872B CN 103322872 B CN103322872 B CN 103322872B CN 201310252293 A CN201310252293 A CN 201310252293A CN 103322872 B CN103322872 B CN 103322872B
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Abstract
The invention discloses a kind of method improving Long-hole Bench Blasting vibration frequency, comprise step successively: step 1, require cloth big gun hole according to explosion; Step 2, completes charge constitution in big gun hole; Step 3, is divided into the N section section of detonating, N >=1 by powder charge section, arrange fire point respectively at each section of detonating mid point, described segment length of detonating is not less than twice damage radius; Step 4, adopts the detonator method of detonating to detonate.The inventive method can improve the induced vibration of rock mass within the scope of 20 ~ 110 meters around quick-fried source, thus reduce Rock Damage degree, more fully avoid the natural frequency of vibration of contiguous buildings or structures, avoid contiguous buildings or structures because of the explosion dynamic buckling caused that resonates, can be used for the drill-blast tunnelling construction in the Geotechnical Engineering fields such as water conservancy and hydropower, mine and traffic.
Description
Technical field
The invention belongs to the Geotechnical Engineering fields such as water conservancy and hydropower, mine and traffic, relate to a kind of method improving Long-hole Bench Blasting vibration frequency.
Background technology
Bore quick-fried efficiency for improving, extensive rock excavation and stock ground exploitation generally adopt Long-hole Bench Blasting.The blasting vibration that Long-hole Bench Blasting brings out is large compared with shallow blasting vibration velocity peak value, frequency is low.Research in the past shows, the safety of induced vibration to Rock Damage and contiguous buildings or structures has material impact: vibration frequency is lower, and blasting vibration impact is larger.One of key factor affecting induced vibration on rock-boring explosion, fire point quantity and position.Tradition detonating technique does not consider the ACTIVE CONTROL to induced vibration.
Summary of the invention
The object of this invention is to provide a kind of method improving Long-hole Bench Blasting vibration frequency, to avoid the low Rock Damage that causes of induced vibration and blasting vibration dynamic buckling.
For achieving the above object, the present invention adopts following technical scheme:
Improve a method for Long-hole Bench Blasting vibration frequency, comprise step successively:
Step 1, requires cloth big gun hole according to explosion;
Step 2, completes charge constitution in big gun hole;
Step 3, is divided into the N section section of detonating, N >=1 by powder charge section, arrange fire point respectively at each section of detonating mid point, described segment length of detonating is not less than twice damage radius;
Step 4, adopts the detonator method of detonating to detonate.
The described employing detonator method of detonating is detonated, and is specially:
Adopt cap sensitive detonator.
For ensureing that in same big gun hole, each fire point detonates simultaneously, same section of other detonator should be adopted to ignite each fire point in same big gun hole.
Compared with prior art, the present invention has following features:
1, the present invention proposes a kind of new detonating technique, do not change the craft of drill and explode and parameter, powder charge section is divided into the N section section of detonating (N >=1), fire point is arranged on the respectively section of detonating mid point, the induced vibration of rock mass within the scope of 20 ~ 110 meters around quick-fried source can be improved in various degree, thus reduce Rock Damage degree, more fully avoid the natural frequency of vibration of contiguous buildings or structures, avoid contiguous buildings or structures because of the explosion dynamic buckling caused that resonates.
2, basis is based on frequency-vibration velocity dual factors blasting vibration safety criterion, and the inventive method can improve the safe allowable vibration speed of contiguous buildings or structures particle, reduces blasting vibration control difficulty, reduces construction investment.
3, the present invention can be used to the vibration frequency improving extensive deep hole blasting, is widely used in the drill-blast tunnelling construction in the Geotechnical Engineering fields such as water conservancy and hydropower, mine and traffic.
Accompanying drawing explanation
Fig. 1 is detonate schematic diagram in middle part;
Fig. 2 is two-point initiation schematic diagram;
Fig. 3 is three-point initiation schematic diagram;
Fig. 4 is the relation curve of explosion master oscillator frequenc and quick-fried heart distance under different modes detonation;
Fig. 5 is the relation curve of blasting vibration centroid frequency and quick-fried heart distance under different modes detonation.
In figure, 1-detonator; 2-blocks section; 3-rock mass; 4-detonator; 5-fire point; 6-powder charge section; 7-air.
Detailed description of the invention
The present invention improves the position of fire point and quantity, powder charge section is divided into the N section section of detonating (N >=1), fire point is arranged on the respectively section of detonating mid point.
Several detailed description of the invention of the present invention is further illustrated below in conjunction with accompanying drawing.
See Fig. 1, for detonating schematic diagram in middle part, the detonation mode namely in N=1 situation, under guarantee explosion and crushing effect prerequisite, is arranged on powder charge section mid point by fire point.
Seeing Fig. 2, is two-point initiation schematic diagram, the detonation mode namely in N=2 situation, and under the prerequisite ensureing explosion and crushing effect, powder charge section is divided into two sections of sections of detonating, two fire points are separately positioned on the respectively section of detonating mid point.
Seeing Fig. 3, is three-point initiation schematic diagram, and under the prerequisite ensureing explosion and crushing effect, powder charge section is divided into three sections of sections of detonating, and three fire points are separately positioned on the respectively section of detonating mid point.
The application of the inventive method, should note following some:
1) selection of fire point position and quantity will consider factors such as improving the effect of induced vibration, economy and construction, and conservative control respectively detonates segment length.
2) fire point is arranged on the powder charge section respectively section of detonating mid point, detonates while each fire point for reaching in same big gun hole, and each fire point should adopt same section of other blasting cap initiation.
3) dynamic finite element numerical simulation result shows, conservative control detonates segment length, and induced vibration can improve 10% ~ 35%.
The embody rule example of the inventive method will be described below.
Certain granite stock ground exploitation of stone, explosion designing requirement is: blast hole depth 18m, big gun hole aperture 150mm, charge diameter 130mm, and blocking segment length 3.0m, adopts continuous charging structure.
Adopt middle part to detonate for this embodiment, concrete steps are:
1, according to above-mentioned designing requirement cloth big gun hole.
2, in the big gun hole of acceptance(check), complete charge constitution according to above-mentioned designing requirement, then, fire point is arranged on powder charge section mid point, in the present embodiment, powder charge section is 15m, then fire point is arranged on 7.5m position at the bottom of distance big gun hole in big gun hole.
3, adopt the detonator method of detonating to detonate, be specially: adopt cap sensitive detonator, excite the detonation of detonator at big gun hole external application on-electric detonator, after detonator is excited, produces shock wave in pipe, reach fire point ignition charge.
Adopt the indirect initiation method of dynamic finite element numerical simulation the present embodiment method of ignition and traditional Long-hole Bench Blasting, obtain the relation curve of explosion master oscillator frequenc and quick-fried heart distance, and the relation curve of blasting vibration centroid frequency and quick-fried heart distance, see Fig. 4 ~ 5.As can be seen from Fig. 4 ~ 5: at the quick-fried heart apart from being within the scope of 20 ~ 110 meters, the explosion master oscillator frequenc detonated in middle part on average improves 17.9%, and blasting vibration centroid frequency on average improves 13.2%.
Adopt two-point initiation for this embodiment, concrete steps are:
1, cloth big gun hole is carried out according to above-mentioned designing requirement.
2, in the big gun hole of acceptance(check), complete charge constitution according to above-mentioned designing requirement, then, adopt two-point initiation, in the present embodiment, powder charge section is 15m, then two fire points are separately positioned on 3.75m and 11.25m position at the bottom of distance big gun hole in big gun hole.
3, adopt detonating tube detonation system to ignite, be specially: adopt blasting cap initiation detonator, detonator sockets for collecting energy direction should be contrary with detonator propagation of explosion direction.
Adopt the indirect initiation method of dynamic finite element numerical simulation the present embodiment method of ignition and traditional Long-hole Bench Blasting, obtain the relation curve of explosion master oscillator frequenc and quick-fried heart distance, and the relation curve of blasting vibration centroid frequency and quick-fried heart distance, see Fig. 4 ~ 5.As can be seen from Fig. 4 ~ 5: at the quick-fried heart apart from being within the scope of 20 ~ 110 meters, the explosion master oscillator frequenc of two-point initiation on average improves 30.2%, and blasting vibration centroid frequency on average improves 21%.
According to China " shotfiring safety code " (GB6722-201x) exposure draft, to above ground structure and the structures such as tunnel, side slope, its blasting vibration safety criterion not only considers Peak Velocity of Blasting Vibration, adds the impact of induced vibration simultaneously.As can be seen from Table 1, raising induced vibration can improve the Blasting Vibration Velocity within the scope of corresponding frequencies.
The relation of the Blasting Vibration Velocity within the scope of table 1 induced vibration and respective frequencies
Based on said frequencies-vibration velocity dual factors blasting vibration safety criterion, the present invention can improve the safe allowable vibration speed of contiguous buildings or structures particle, reduces blasting vibration control difficulty, reduces construction investment.
Claims (3)
1. improve a method for Long-hole Bench Blasting vibration frequency, comprise step: carry out cloth big gun hole according to designing requirement, in big gun hole, complete charge constitution, fire point arrange and detonate, it is characterized in that:
Described fire point arranges and is specially:
Powder charge section is divided into the N section section of detonating, N>1, arrange fire point respectively at each section of detonating mid point, described segment length of detonating is not less than twice damage radius.
2. the method improving Long-hole Bench Blasting vibration frequency as claimed in claim 1, is characterized in that:
Described carrying out is detonated and adopts detonator to detonate method.
3. the method improving Long-hole Bench Blasting vibration frequency as claimed in claim 2, is characterized in that:
In same big gun hole, each fire point adopts same section of other detonator to ignite.
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| CN201310252293.8A CN103322872B (en) | 2013-06-24 | 2013-06-24 | A kind of method improving Long-hole Bench Blasting vibration frequency |
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| CN103322872B true CN103322872B (en) | 2015-08-19 |
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| CN107766287B (en) * | 2017-10-26 | 2020-12-29 | 哈尔滨工程大学 | Random dynamics analysis method based on material point method applied to explosive impact engineering |
| CN117540470B (en) * | 2023-11-21 | 2024-04-30 | 武汉科技大学 | Blasting parameter design method for frequency regulation and control based on Doppler effect |
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| KR101249722B1 (en) * | 2010-12-24 | 2013-04-02 | (주)대은플라즈마 | Apparatus for distributed blasting and the method thereof |
| KR101303260B1 (en) * | 2011-07-15 | 2013-09-03 | 에스에이치블래스텍 주식회사 | Deck charge blasting method |
| CN102607353B (en) * | 2012-02-27 | 2015-11-25 | 薛世忠 | A kind of perron Delay between holes controlled blasting method |
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