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Field Application of Hydraulic Rock Splitting Technique to Biotite Granite

흑운모화강암 지역에 대한 수압암반절개기술의 현장 적용

  • Received : 2017.09.27
  • Accepted : 2017.10.25
  • Published : 2017.10.31

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

References

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Acknowledgement

Grant : 생활환경질 개선을 위한 암반 굴착시 수압절개를 이용한 소음.진동 저감 기술개발

Supported by : 환경부