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2019 Vol.21, Issue 6 Preview Page

Research Paper

Performance analysis of sand abrasives for economical rock cutting using waterjet

경제적인 워터젯 암반절삭을 위한 모래 연마재 성능 분석

Tae-Min Oh1*
,
Dong-Yeup Park2
,
Tae-Hyun Kong2
오 태민1*
,
박 동엽2
,
공 태현2
1Assistant Professor, Department of Civil Engineering, Pusan National University
2Student Researcher, Department of Civil Engineering, Pusan National University
1정회원, 부산대학교 토목공학과 조교수
2비회원, 부산대학교 토목공학과 학생연구원
* Corresponding Author
30 November 2019. pp. 763-778
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Abstract

Abrasive waterjet cutting technology has been used for rock excavation of tunnels and underground structures due to various advantages. In order to cut rocks by using the abrasive waterjet system, abrasive is essential to enhance impact energies for fracturing the target rock. Since garnet abrasives are not produced in Korea, alternative abrasives, instead of garnets, are needed to achieve the economical waterjet cutting. This study is to analyze cutting performance for rocks with sandy particles as alternative abrasive. Cutting tests were carried out on granite specimens at the constant waterjet energy (e.g., water pressure or water flow rate). The five kinds of sands, sampled by construction fields and natural sites, were prepared to perform the experimental tests. When sea sand was used as an alternative abrasive, cutting performance was secured to be 60~70% compared to the commercial garnet abrasive. Thus, it is expected that sand abrasives can be applied on the waterjet cutting process for the economical excavation construction.

Keywords
Waterjet cutting
Rock cutting
Abrasive characteristics
Sand
Garnet

연마재 워터젯 절삭 기술은 다양한 장점으로 인하여 터널 및 지하공간 암반굴착에 활용되고 있다. 워터젯을 이용하여 암반을 파쇄하기 위해서는 반드시 연마재 투입이 필수적이다. 기존 석류석(garnet) 연마재는 국내에서 생산되지 않기 때문에 경제적 측면에서 대체 연마재가 필요한 실정이다. 본 연구는 국내 자연 및 건설현장에서 쉽게 구할 수 있는 모래를 대체 연마재로 사용 가능한지 규명하고자 한다. 실험 데이터 확보를 위해 준비한 현장 모래 5종을 연마재로 사용하여, 동일한 에너지 조건(수압, 유량)에서 화강암 절삭 실험을 수행하였다. 바다 모래를 연마재로 사용할 경우, 절삭성능은 상용 석류석 대비 60~70%가 확보되는 것으로 확인되었다. 현장에서 경제적인 워터젯 굴착을 위해서 현장 모래를 대체 연마재로 활용 할 수 있을 것으로 기대된다.

키워드
워터젯 절삭
암반 절삭
연마재 특성
모래
석류석
References
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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 : 21
  • No :6
  • Pages :763-778
  • Received Date : 2019-08-21
  • Revised Date : 2019-09-30
  • Accepted Date : 2019-10-08
  • DOI :https://doi.org/10.9711/KTAJ.2019.21.6.763
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