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2017 Vol.19, Issue 6 Preview Page
Propagation characteristics of blast-induced vibration to fractured zone

파쇄영역에 따른 발파진동 전파특성

Jae-Kwang Ahn1
,
Duhee Park2*
,
Ki-Chun Park3
,
Ji Nam Yoon4
안 재광1
,
박 두희2*
,
박 기천3
,
윤 지남4
1Post-Doc., Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology
2Associate Professor, Dept. of Civil and Environmental Engineering, Hanyang University
3Graduate Student, Dept. of Civil and Environmental Engineering, Hanyang University, CEO, BMSENC Co. Ltd.
4Graduate Student, Dept. of Civil and Environmental Engineering, Hanyang University, Infra Division Sr. Manager, POSCO E&C
1정회원, 한국건설기술연구원 지반연구소 박사후 연구원
2정회원, 한양대학교 건설환경공학과 부교수
3비회원, 한양대학교 건설환경공학과 박사과정, (주)비엠에스이앤씨 대표이사
4정회원, 한양대학교 건설환경공학과 박사과정, 포스코건설 인프라사업본부 부장
*교신저자. *Corresponding Author. 
30 November 2017. pp. 959-972
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Abstract

In evaluation of blast-induced vibration, peak particle velocity (PPV) is generally calculated by using attenuation relation curve. Calculated velocity is compared with the value in legal requirements or the standards to determine the stability. Attenuation relation curve varies depending on frequency of test blasting, geological structure of the site and blasting condition, so it is difficult to predict accurately using such an equation. Since PPV is response value from the ground, direct evaluation of the structure is impractical. Because of such a limit, engineers tend to use the commercial numerical analysis program in evaluating the stability of the structure more accurately. However, when simulate the explosion process using existing numerical analysis program, it’s never easy to accurately simulate the complex conditions (fracture, crushing, cracks and plastic deformation) around blasting hole. For simulating such a process, the range for modelling will be limited due to the maximum node count and it requires extended calculation time as well. Thus, this study is intended to simulate the elastic energy after fractured zone only, instead of simulating the complex conditions of the rock that results from the blast, and the analysis of response characteristics of the velocity depending on shape and size of the fractured zone was conducted. As a result, difference in velocity and attenuation character were calculated depending on fractured zone around the blast source appeared. Propagation of vibration tended to spread spherically as it is distanced farther from the blast source.

Keywords
Blast vibration
Attenuation curve
Blast source
Fractured zone
Numerical analysis

발파진동 안정성 평가는 일반적으로 발파 진동추정식을 통해 최대진동속도(PPV)를 산정하고 추정된 속도 값과 법규 혹 은 기준에 제시된 허용 기준 값을 비교하여 안정성 여부를 판단한다. 현장 고유의 발파 진동추정식은 시험 발파의 횟수, 대상지반의 지질학적 구조와 발파 조건에 따라 달라지기 때문에 이 식을 통해 정확한 응답 값을 예측하는 것은 한계가 있 다. 또한 최대진동속도는 지반에 예상되는 응답 값으로 구조물에 대한 직접적인 평가는 불가능하다. 이와 같은 한계점으 로 인해 발파 진동에 대한 구조물의 정밀한 안정성을 평가할 경우 엔지니어들은 상용화된 수치해석 프로그램을 이용한 다. 하지만 폭발로 인해 발생하는 발파공 주변 암반의 복합적인 상태변화(파쇄, 분쇄, 균열, 소성변형)를 기존 수치해석 프로그램으로 정확히 모델링 하기가 쉽지 않다. 만약 이러한 일련의 과정을 모사할 경우 절점 수의 제한으로 인해 모델링 이 가능한 범위가 한정적이고 긴 연산시간이 소요된다. 따라서, 본 연구에서는 폭발로 발생하는 암반의 복합적 상태변화 과정을 모사하지 않고 파쇄영역 이후 탄성에너지 전파만을 모사하는 해석 방법에 대한 연구를 수행하였으며, 이때 파쇄 영역의 형상 및 크기에 따른 속도의 응답특성을 분석하였다. 그 결과 폭원 주변에서는 설정되는 파쇄영역에 따라 계산된 속도의 크기 및 감쇠에 차이를 보였다. 전파되는 진동은 폭원으로부터 멀어질수록 구형으로 확산되는 것으로 나타났다.

키워드
발파진동
감쇠곡선
폭원
파쇄영역
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 : 19
  • No :6
  • Pages :959-972
  • Received Date : 2017-10-11
  • Revised Date : 2017-10-24
  • Accepted Date : 2017-11-07
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.6.959
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