All Issue

2015 Vol.17, Issue 2 Preview Page
Variation of abrasive feed rate with abrasive injection waterjet system process parameters

연마재 투입형 워터젯 시스템의 공정 변수에 따른 연마재 투입량 변화

Gun-Wook Joo1
,
Tae-Min Oh2
,
Hak-Sung Kim3
,
Gye-Chun Cho4*
주 건욱1
,
오 태민2
,
김 학성3
,
조 계춘4*
1Department of Civil and Environmental Engineering, KAIST
2Underground space Department, KIGAM
3Department of Civil and Environmental Engineering, KAIST
4Department of Civil and Environmental Engineering, KAIST
1KAIST 박사과정
2KIGAM 선임연구원
3KAIST 박사 후 과정
4KAIST 교수
*교신저자. *Corresponding Author. 
31 March 2015. pp. 141-151
PDF XML Citation
Abstract

A new rock excavation method using an abrasive injection waterjet system has been developed to enhance the efficiency and reduce the vibration of tunnel excavation. The abrasive feed rate is an important factor for the cutting performance and the economical efficiency of waterjet-based excavation. In this study, various experiments were performed to explore the effects of major process parameters for both the abrasive feed rate and the suction pressure occurring inside the mixing chamber when the abrasives are inhaled. Experimental results reveal that the abrasive feed rate is affected by geometry parameters (abrasive pipe height, length, and tortuosity), abrasive parameters (abrasive particle size), and jet energy parameters (water pressure and water flow rate). In addition, the relation between the cutting performance and the abrasive feed rate was discussed on the basis of the results of an experimental study. The cutting performance can be maximized when the abrasive feed rate is controlled appropriately via careful management of major process parameters.

Keywords
Abrasive injection waterjet system
Suction pressure
Abrasive feed rate
Abrasive waterjet process parameter
Rock cutting

터널굴착의 효율성 증진 및 굴착시 발생하는 진동 저감을 위해 연마재 투입형 워터젯 시스템을 이용한 새로운 형태의 암반 굴착 방식이 개발되어 적용 중에 있다. 연마재 투입형 워터젯 시스템을 이용한 암반 굴착 방식에 있어서, 적절한 양의 연마재를 투입하는 것은 절삭 성능뿐만 아니라 전체 공정의 경제성 향상을 위해서도 매우 중요하다. 본 연구에서는, 다양한 공정 변수들 중 터널 굴착용 워터젯 시스템에서 특히 중요한 공정 변수들인 기하학적 변수(연마재 탱크(또는 호퍼) 높이, 연마재 투입관의 구배, 연마재 투입관의 길이, 연마재 투입관의 굴곡도), 연마재 변수(연마재 입자 크기), 젯 에너지 변수(수압, 유량)이 연마재 투입량 및 연마재가 믹싱 챔버 내로 흡입될 때 발생하는 흡입 압력에 미치는 영향을 규명하기 위하여 다양한 조건에서 실험을 수행하고 그 결과를 분석하였다. 또한, 실험적 연구를 통하여 연마재 투입량이 절삭 성능에 미치는 영향을 논의하였다. 본 연구 결과를 바탕으로 주요 공정 변수들을 조절하여 적절한 연마재 투입량을 유지하면 터널 굴착용 워터젯의 절삭 성능을 극대화할 수 있을 것으로 기대된다.

키워드
연마재 투입형 워터젯 시스템
흡입 압력
연마재 투입량
연마재 워터젯 공정 변수
암반 절삭
References
1
1.Aydin, G., Karakurt, I., Aydiner, K. (2011), “Performance optimization of abrasive waterjet technology in granite cutting”, Proceeding of the American Water Jet Conference, Houston, U.S.A., Paper F2.
2
2.Chalmers, E.J. (1991), “Effect of parameter selection on abrasive waterjet performance”, Proceeding of the American Water Jet Conference, Houston, U.S.A., Paper 25.
3
3.Corner, I., Ramula, M. (2005), “Estimation of abrasive mass flow rate by measuring feed line vacuum during jet on-off cycling”, Poceeding of the 2005 American Water Jet Conference, Houston, U.S.A, Paper 3A-3.
4
4.Crafoord, R., Kaminski, J., Lagerberg, S., Ljungkrona, O., Wretland, A. (1999), “Chip control in tube turning using a high-pressure water jet”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manu-facture, Vol. 213, No. 8, pp. 761-767.
5
5.Daedeok Innopolis Foundation (2014), Development of Frame-rail based Waterjet Pre-cutting Equipment for Minimizing Blasting Vibration (at least 50% for Vertical Direction) on Tunnel, Final Report for Daedeok Innopolis Technology Commercialization Project, pp. 115-119.
6
6.Hashish, M. (1984), “A modeling study of metal cutting with abrasive waterjets.” Journal of Eng-ineering Materials and Technology, Vol. 106, No. 1, pp. 88-100.
7
7.Hashish, M. (2011), “AWJ cutting with reduced abrasive consumption”, Proceeding of the American Water Jet Conference, Houston, U.S.A., Paper A4.
8
8.Hood, M. (1985), “Waterjet-assisted rock cutting systems-the present state of the art”, International Journal of Mining Engineering, Vol. 3, No. 2, pp. 91-111.
9
9.Joo, G.W., Oh, T.M., Cho, G.C. (2014), “Influencing factors for abrasive flow rate and abrasive flow quality of abrasive injection waterjet systems for tunnel excavation”, Korean Tunnelling and Under-ground Space Association, Vol. 16, No. 4, pp. 417-430.
10
10.Joo, G.W. (2014), “Effect of abrasive characteristics on waterjet rock cutting”, M.S. Thesis, Korea Advanced Institute of Science and Technology, Dae-jeon, Republic of Korea, 151 pages.
11
11.Kim, J.G., Song, J.J., Han, S.S., Lee, C.I. (2012), “Slotting of concrete and rock using an abrasive suspension waterjet system.” KSCE Journal of Civil Engineering, Vol. 16, No. 4, pp. 571-578.
12
12.Lee, C.I. (2012), “Application of water jet technology to industry-current state, research trend and prospect”, the Korean Institute of Mineral and Energy Resources Engineers, Vol. 49, No. 2, pp. 226-238.
13
13.Momber, A.W., Kovacevic, R. (2000), “Particle-size distribution influence in high-speed erosion of aluminium”, Particulate Science and Technology, Vol. 18, No. 3, pp. 199-212.
14
14.Oh, T.M. (2012), “Rock excavation using abrasive waterjet”, Ph.D. Thesis, Korea Advanced Institute of Science and Technology, Dae-jeon, Republic of Korea, pp. 41-75.
15
15.Oh, T.M., Cho, G.C. (2012), “Effect of abrasive waterjet parameters on rock removal”, Korean Tunnelling and Underground Space Association, Vol. 14, No. 4, pp. 421-435.
16
16.Oh, T.M., Cho, G.C., Ji, I.T. (2013), “Effect of free surface using waterjet cutting for rock blasting excavation”, Korean Tunnelling and Underground Space Association, Vol. 15, No. 1, pp. 49-57.
17
17.Summers, D.A. (1995), Waterjetting technology, E and FN Spon, pp. 286-298; 419-468.
18
18.Sunwoo, C., Choi, B.H., Ryu, C.H. (1994), “A study on the slot cutting in granite by high speed water jet.” Korean Society for Rock Mechanics, Vol. 4, No. 2, pp. 92-101.
19
19.Woodward, M.J. (1993), “Water soluble abrasives”, Proceeding of the American Water Jet Conference, Seattle, U.S.A., Paper 28.
20
20.Wright, D.E., Summers, D.A. (1993), “Performance enhancement of diadrill operations”, Proceeding of the American Water Jet Conference, Seattle, U.S.A., Paper 39.
21
21.Zeng, J., Muñoz, J. (1994), “Feasibility of monitoring abrasive waterjet conditions by means of vacuum sensor”, 12th International Conference on Jet Cutting Technology, pp. 553-565.
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 : 17
  • No :2
  • Pages :141-151
  • Received Date : 2015-03-13
  • Revised Date : 2015-03-23
  • Accepted Date : 2015-03-24
  • DOI :https://doi.org/10.9711/KTAJ.2015.17.2.141
Journal Informaiton Journal of Korean Tunnelling and Underground Space Association Journal of Korean Tunnelling and Underground Space Association
Online Submission & Review System
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close