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2017 Vol.27, Issue 5 Preview Page

Technical Note

Field Application of Hydraulic Rock Splitting Technique to Biotite Granite

흑운모화강암 지역에 대한 수압암반절개기술의 현장 적용

Jongoh Park1
,
Dal-Heui Lee2
,
Ik Woo3*
박 종오1
,
이 달희2
,
우 익3*
1Young In Industry
2Yonsei University
3Kunsan National University
1영인산업(주)
2연세대학교 이과대학
3군산대학교 산학융합공과대학
* 교신저자* Corresponding Author
1 October 2017. pp. 263-270
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Abstract

Hydraulic rock splitting is a technique which leads to failure of rockmass by means of water injection with a pressure higher than the tensile strength of rockmass, using straddle packer installed in boreholes drilled from free surface. Field tests were conducted in this study for several slopes of biotite granite according to various designs for borehole layout and water injection. Test results showed that new cracks were generated to connect to adjacent holes or that pre-existed cracks were propagated by injection, finally leading to failure. In particular, this study suggests the possibility of controlling the direction of generated cracks with guide slot, since new cracks were generated parallel to the guide slots carved on a borehole wall before injection. Various types of borehole layout and injection methods should be further developed for the practical uses, considering the factors influencing on crack generation.

Keywords
Hydraulic rock splitting
Guide slot
Crack generation
Layout design
Biotite granite

수압암반절개기술은 천공된 시추공에 설치된 이중패커의 인터벌에 암반의 인장응력 이상의 수압을 가하여 균열을 발생시킴으로써 암반을 절개시키는 방법이다. 본 연구에서는 흑운모화강암 사면에 대하여 다양한 배열설계 및 주입설계에 따라 수압암반절개기술을 현장에 적용하였다. 실험 결과, 주입에 따라 새로운 균열이 발생되어 주변 공과 연결되거나 기존 균열이 연장되어 암반이 파괴되었다. 특히, 본 실험에서는 유도 슬롯과 평행한 방향을 지닌 균열이 발생되어 균열 생성방향을 제어할 수 있는 가능성을 제시하였다. 균열생성에 대한 제어 기술을 발전시키기 위해선, 균열생성에 영향을 미치는 여러 요소를 고려한 다양한 배열설계 및 주입설계를 암반 현장에 적용하여야 할 것이다.

키워드
수압암반절개
유도슬롯
균열생성
배열설계
주입설계
흑운모화강암
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 27
  • No :5
  • Pages :263-270
  • Received Date : 2017-09-27
  • Revised Date : 2017-10-23
  • Accepted Date : 2018-10-25
  • DOI :https://doi.org/10.7474/TUS.2017.27.5.263
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