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2019 Vol.29, Issue 4 Preview Page

Research Article

Field Tests of Hydraulic Rock Splitting Technique Using Arrays of Injection Holes with Guide Slots

유도슬롯과 주입공 배열을 이용한 수압암반절개 현장 실험

Jong Oh Park1
,
Ik Woo2*
박 종오1
,
우 익2*
1Managing Director, Songam Engineering & Construction
2Professor, School of Architecture & Coastal Construction Engineering, Kunsan National University
1(주)송암 전무이사
2군산대학교 해양건설공학과 교수
*Corresponding Author
31 December 2019. pp. 405-415
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Abstract

The cracks induced by hydraulic rock splitting technique are formed in the direction parallel to the free plane, which is perpendicular to the minimum principal stress of the ground, or is affected by the pre-existing microcracks. In this study, the hydraulic rock splitting experiments were conducted in which the guide slot was engraved in the direction parallel to the borehole axis on the biotite granite slope, and the hydraulic pressure was injected through the double packer pressure and interval section. The test results show that the cracks along with the guide slots were induced either by the double packer pressurization or the injection of hydraulic pressure into interval section, some cracks extended across the boreholes. Therefore, the hydraulic rock splitting test is expected to control efficiently the induced cracks if the guide slots are engraved in the direction of splitting and a big flow rate is applied.

Keywords
hydraulic rock splitting
induced crack
guide slot
hydraulic pressure
staddle packer pressurization
free surface

수압암반절개에서 유도된 균열은 자유면에서 지반의 최소주응력에 수직인 방향인 자유면과 평행한 방향으로 형성되거나, 기존에 발달한 미세균열의 영향을 많이 받는다. 본 연구에서는 흑운모화강암 사면에서 시추공 축과 평행한 방향으로 유도슬롯을 생성하여 이중패커의 압력 및 인터벌 구간에 수압을 주입하는 수압암반절개 실험을 수행하고 그 결과를 분석하였다. 실험 결과, 이중패커 압력 및 인터벌 구간 내의 주입으로 형성된 균열은 유도슬롯 방향을 따라 미세하게 나타났으며, 일부 균열은 시추공을 가로질러 연장되었다. 따라서 수압암반절개는 절개할 방향으로 유도슬롯을 생성하여 보다 많은 유량을 주입하면 효율적인 유도균열 조절이 가능할 것으로 판단된다.

키워드
수압암반절개
유도균열
유도슬롯
수압
이중패커 가압
자유면
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :4
  • Pages :405-415
  • Received Date : 2019-10-08
  • Revised Date : 2019-12-16
  • Accepted Date : 2019-12-17
  • DOI :https://doi.org/10.9720/kseg.2019.4.405
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