A study on the effect of blasting vibration and the optimal blasting offset according to the depth of tunnel

Suk-Min Kong; Sang-Il Choi; Yeong-Bae Kim; Won-Seok Noh; Chang-Yong Kim; Seong-Won Lee

doi:10.9711/KTAJ.2022.24.6.483

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2022 Vol.24, Issue 6 Preview Page Next Page

Research Paper

A study on the effect of blasting vibration and the optimal blasting offset according to the depth of tunnel 터널 심도에 따른 발파 진동 영향 및 최적 발파 이격거리 연구

30 November 2022. pp. 483-494

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Abstract

Owing to the saturation of ground spaces in downtown areas, underground spaces are being developed increasingly. Underground spaces are utilized for transportation, water supply and sewerage, communication zones, electric power zones, and various cultural complexes. In Korea, for excavating underground spaces, blasting methods using gunpowder such as the New Austrian Tunneling Method (NATM) are mainly used. However, the blasting method causes vibration and noise during tunnel excavation, generating many complaints from residents in the vicinity of the excavation site. To address this problem, various methods have been developed, and recently, vibration and noise have been reduced using deep excavation. This study predicts blast vibration changes according to the depth, under the same blasting and tunnel conditions, using numerical analysis based on the blast vibration measurement data of the GTX-A route, the tunnel cross-section drawings, and ground investigation reports. Furthermore, the necessary separation distance from densely populated areas such as residential areas is suggested by analyzing the trend of decreasing blast vibration according to the distance from ground surface directly above the blasting location.

Keywords

Tunnel excavation

Blasting method

Blast vibration

Deep excavation

Numerical analysis

도심지 지상공간의 포화로 인한 지하공간 개발은 지속적으로 증가하고 있으며, 지하공간은 교통, 상하수도, 통신구, 전력구 및 각종 복합 문화 공간으로 활용되고 있다. 지하공간을 굴착하는 대표적인 방법으로 국내에서는 NATM (New Austrian Tunneling Method)과 같은 화약을 이용한 발파 공법이 주로 사용되어왔다. 하지만, 발파 공법은 터널 굴착 시 진동과 소음을 유발하기 때문에 굴착 인근 지역 주민들의 민원이 많이 발생한다. 최근 도심지 대심도 지하공간 굴착공사가 증가하고 있어 발파 진동과 소음 저감을 위한 근본적인 노력과 기술이 필요로 되고 있는 상황이다. 본 연구에서는 GTX-A 노선 일부구간의 현장 발파 진동 계측자료 및 지반조사자료와 설계자료를 활용하여 동일 발파, 터널조건에서 심도에 따른 발파 진동 변화를 수치해석을 통해 예측하고자 한다. 또한 발파 위치 직상부로부터의 이격거리에 따라 발파 진동의 감소 경향을 분석하여 주택가와 같은 인구 밀집 지역으로부터 필요한 이격거리를 제시하고자 한다.

키워드

터널 굴착

발파 공법

발파 진동

지하공간

수치해석

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 24
No :6
Pages :483-494
Received Date : 2022-09-16
Revised Date : 2022-10-14
Accepted Date : 2022-10-27
DOI :https://doi.org/10.9711/KTAJ.2022.24.6.483

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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