• Title, Summary, Keyword: Tunnel blasting

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Design guide for full-face blasting in highway tunnel (고속도로 터널에 대한 전단면 발파 설계방안 연구)

  • Lee, Sang-Don;Choi, Hae-Moon;Lee, Hyun-Koo;Ryu, Chang-Ha
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.930-937
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    • 2004
  • In tunnel blasting, rock damage and overbreak at excavation limits are strongly related to stability of the tunnel and cost for rock support, and also affect to maintenance after tunnel construction. In this study, many field tests and measurements have been carried out in highway tunnels so that discordance between blast design and practical production blasting could be settled and actual methods of over break control could be proposed through the understanding of the problems in existing blasting patterns. Test blasting in tunnel was carried out many times in two tunnel sites. Also, long hole blasting longer than existing blasting pattern was executed for good grade of rock mass whose RMR value is more than 60. Using the results of test blasting, new standard blasting patterns for two lane tunnel were proposed. As a result of profile measurement after blasting, drilling is a major factor of overbreak. And then the methods for minimizing overbreak were adapted in new blasting patterns.

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Tunnel Blasting Design with Equations Obtained from Borehole and Crater Blasting (시추공 및 누두공 발파자료의 터널설계 적용)

  • 양형식;임성식;김원범
    • Journal of the Korean Geotechnical Society
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    • v.19 no.5
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    • pp.327-333
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    • 2003
  • Characteristics of vibration propagation of borehole blasting were analyzed with 578 borehole vibration data obtained from 23 sites which were used in tunnel and underground space design, and 221 tunnel vibration data fron 4 sites of tunnel under construction. Analysis results on the damping of vibration velocity show that site factors in borehole blasting were higher than those in tunnel blasting. And the critical charge calculated from regression equations at large scaled distance was lower in borehole blasting. Dominant frequency was in the range of 30∼60Hz for the borehole blasting and 60∼90Hz for the tunnel blasting. As a conclusion, the borehole blasting data should not be used on the tunnel blasting design without careful statistical analysis.

Numerical Modelling of Tunnel Blasting (터널발파의 수치해석적 모델링)

  • 이인모;최종원;김상균;김동현
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.133-140
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    • 2000
  • Drilling and blasting method for excavating rock mass is generally used in underground construction; but this technique has some shortcomings. For instance, rock mass damage is inevitable during drilling and blasting, and blast-induced vibration frequently causes some problems. Until now, field measurement method is used to predict the overbreak and vibration; but it has many limitations. Therefore, numerical analysis method is needed to overcome such limitations, and to estimate and predict damage and vibration due to tunnel blasting in the design stage. In this study, damage zone of rock mass due to stoping and contour blasting is compared based on standard tunnel blasting pattern, and the propriety of the standard tunnel blasting pattern is estimated. Then, blasting pattern is optimized so that the damage zone due to sloping blasting with reduced charge is consistent with that due to contour blasting.

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Effect of Rock Damage Induced by Blasting on Tunnel Stability (발파굴착의 암반손상이 터널안정성에 미치는 영향분석)

  • Lee, In-Mo;Yoon, Hyun-Jin;Kim, Dong-Hyun;Lee, Sang-Don;Park, Bong-Ki
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.681-688
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    • 2003
  • Rock damage induced by blasting can not be avoided during tunnel construction and may affect tunnel stability. But the mutual interaction between tunnel blasting design and tunnel stability design is generally not considered. Therefore this study propose a methodology to take into considration the results of the blasting damage in tunnel stability design. Rock damage is evaluated by dynamic numerical analysis for the most common blasting pattern adopted in road tunnel. Damage zone is determined by using the continuum damage model which is expressed as a function of volumetric strain. And the damage effect is taken into account by the damaged rock stiffness and the damaged failure criteria in tunnel stability assessment. The extend of plastic zone and deformation increase compared to the case of not considering blast-induced rock damage.

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A Study on the Installation Time and Method of Soundproofing Facilities According to Tunnel Blasting Work (터널발파작업에 따른 방음시설의 설치시기와 방법에 대한 고찰)

  • Won, Yeon-Ho;Son, Young-Bok;Jeong, Jai-Hyung
    • Explosives and Blasting
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    • v.25 no.1
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    • pp.1-14
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    • 2007
  • A blasting noise generated by blasting work, which is a kind of shock-noise, influences the human body. A civil appeal due to blasting noise causes work discontinuance and downsizing of a blasting scale. Most of soundproof facilities for reducing a blasting noise is installed at each working spot by itself and the degree of a noise reduction is very low. The aim of this study is to recommend a technology on noise reduction considering the method and material of soundproof facilities. As the first study step to acquire basic data, investigations on the installation time, installation method, and material of the soundproof facilities have been done at about 20 tunnel work spots such as railroad tunnel, road tunnel, tunnel for electric power.

On the study of the measurement of blasting Vibration and Sound influenced to housing structure at Wire-Tunnelling (부산 통신구굴진 발파작업으로 인한 지상주택 구조물에 미치는 진동폭음영향계측조사보고)

  • Huh Ginn
    • Explosives and Blasting
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    • v.8 no.2
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    • pp.3-17
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    • 1990
  • The Caustious blasting have often increased Complaints of ground Vibration and Sound when the Wire-Tunnel Constructed in Pusan. In order to prevent the influence to housing structure, it was necessary to predict blasting-Induced Vibration and Sound. The Suveyer determined the Burden and spacing of Drill holes, minimum delay charges within a allowable Vibration and Sound Level. Tunnel drilling and Ignition patterns are made as follows; No. 1 Tunel (Stable rock, hard rock) No.2 Tunnel (Instable plastic rock; wethered rock) and other Tunnels (Instable rock). The result of 1st testing blasting of No. 1 Tunnel was recorded Under allowable Vibration Level but sound was over 75 Db of allowable value. So Tunnel drilling pattern was amended with 52 Non-charg holes to reduce the blast-sound. The other pattern had no need to amend.

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Development of Automated Pattern Generation Method for Tunnel Blasting (터널발파설계 자동화를 위한 발파패턴 설계식 개발)

  • Choi Yong-Kun
    • Explosives and Blasting
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    • v.23 no.4
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    • pp.19-29
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    • 2005
  • Blasting design methods applied in Korea were originally made for foreign rock conditions and blasting environments. Therefore, it has not been fully fitted to the Korean rock renditions. Since 1998, several studies for the automated pattern design of tunnel blasting have been carried out. As the result, a new blasting design method which can settle the problems was developed. Through it is more complex than prior method, it call provide a variety of advantages for us. Through the method, it is possible to vary charge weight according to the changing advance. It ran also be applied to the various design for contour holes. In this study, the newly developed method is introduced.

Electronic Blasting for Excavating Single Line Railway Tunnel Close to Residential Area (보안물건이 근접한 소단면 철도 단선터널 굴착시 전자발파 시공사례)

  • Lee, Min Su;Kim, Hee Do
    • Explosives and Blasting
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    • v.34 no.3
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    • pp.17-20
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    • 2016
  • This paper introduce a multistage parallel non-vibration electronic tunnel blasting cases which adapts Electronic Blasting System(EBS) and the center-cut blasting method to excavating a single line railway tunnel close to residential area. As a result, it was revealed that the vibration and noise showed a reduction of 23.5% and 75% of compared with the allowable standard. We successfully completed the tunnel excavation with decreasing construction time and construction cost and without civil compliant.

The Blasting Pollution Effects Estimation & The Excavation Construction Case Study Of Personal Museum On Tunnel (산악터널에 인접한 개인 박물관의 발파공해 영향평가 및 굴착 시공사례)

  • Kwon, Soon-Sub;Lee, Myong-Choul;Park, Tae-Soon;Jeong, In-Choul;Lee, Hyun-Gu
    • Proceedings of the KSR Conference
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    • pp.127-132
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    • 2004
  • The third double-track construction part of work, called Chung Ang Railroad line(Deok-So$\∼$Won-Ju) is in progress and the personal museum located 330m from the starting point of Pal-Dang Tunnel(length=4,470m) line in the canyon is to be effected by rock blasting during the tunnel excavation work, especially museum articles and building itself. This paper is the example of application suitable tunnel rock blasting pattern for excavation after the case study about the investigation and analysis of rock blasting noise pollution during tunnel excavation work. The museum is a three-story building, RC concrete structure and is located 17m from the top of the tunnel, in the center of the double-track line. Comparing estimate vibration frequency with site vibration one, it can be verified the reasonable rock blasting noise pollution as improving the application of tunnel excavation rock blasting pattern. The above pattern has been selected economically and effectively and applied to our construction field.

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Blasting Design for Large Shaft in Urban Area Considering Noise and Vibration -Singapore Transmission Cable Tunnel EW2- (소음 및 진동을 고려한 도심지 내 대단면 수직구 발파설계 사례 -싱가포르 Transmission Cable Tunnel EW2 공구-)

  • Kim, Julie;Lee, Hyo;Kim, Dave;Ko, Tae-Young;Lee, Simon
    • Explosives and Blasting
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    • v.31 no.1
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    • pp.55-63
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    • 2013
  • With increasing needs in power, Singapore is requiring stronger power transmission. Singapore Transmission Cable Tunnel is underground tunnel for transmission system installation such as 400 kV cable. This Transmission Cable Tunnel is 35 km long in total. The North-South Transmission Cable Tunnel is 18.5 km long and there is a total of three (3) contracts; NS1, NS2 and NS3 in respect of the design and construction. The East-West Transmission Cable Tunnel is 16.5 km long, and also there is a total of three (3) contracts; EW1, EW2 and EW3. Among of them, SK E&C has been awarded and operating contract EW2 and NS2. In scope of works, each contract has 3 to 4 shafts which connect aboveground and underground high volt cable and those shafts are used as TBM launching shafts during construction. Transmission Cable Tunnel is undercrossing middle of Singapore and most of shafts are located in urban area. Thus, optimal blasting design satisfying high blasting efficiency as well as blasting vibration limit of Singapore is highly required. Blasting design for large shaft of Singapore Transmission Cable Tunnel follows blasting vibration limits in Singapore and reflects our blasting engineering skills. With Singapore Transmission Cable Tunnel Contract EW2, it is expected that our excellent blasting engineering and performance skills can be delivered to the world.