Estimating and Analyzing the Appropriate Pressing Force of the Rock Cutting Splitting Method

Sang-Min Lee, Mun-Gyu Kim, Jung-Woo Cho, Sang-Hwa Yu

doi:10.7474/TUS.2021.31.6.415

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2021 Vol.31, Issue 6 Preview Page Next Page

Technical Notes

Estimating and Analyzing the Appropriate Pressing Force of the Rock Cutting Splitting Method 암반 커팅 스플리팅 공법의 적정 압입력 추산을 위한 분석해

31 December 2021. pp. 415-427

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Abstract

본 기술보고는 개발 중인 암반 커팅 스플리팅 공법을 간략히 소개하였다. 이 공법은 암반 커팅 공정 후 블럭을 스플리팅하여 암반을 굴착하는 공법이다. 암반면의 커팅 지오메트리를 설계한 후 치즐을 압입하여 암석블록을 제거하는 방식이다. 이 때 적절하게 커팅블록이 설계되어야 원활한 암석블록 하단부에 인장균열이 원활히 전파된다. 인장균열 성장에 필요한 파괴인성 모드1을 이용하여 암석블럭의 스플리팅에 필요한 압입력을 추산하는 분석해를 고안하였다. 굴착기의 유압브레이커의 타격력을 분석하였고, 암석블록 설계 지오메트리에 따라 시공가능한 굴착기 등급을 분석하였다.

키워드

커팅 스플리팅

암석블록

인장균열

파괴인성

This technical report briefly introduced the rock cutting splitting method under development. This method is a method of excavating the rock by splitting the block after the rock cutting process. After designing the cutting geometry of the rock face, the chisel is press-fitted to remove the rock block. At this time, when the cutting block is properly designed, the tensile crack propagates smoothly at the bottom of the rock block. An analytical solution was devised to estimate the indentation force required for splitting rock blocks using fracture toughness mode 1 required for tensile crack growth. The impact force of the hydraulic breaker of the excavator was analyzed, and the grade of the excavator that can be constructed according to the rock block design geometry was analyzed.

Keywords

Cutting splitting

Rock block

Tensile crack

Fracture toughness

References

Cho, J.W., Oh, J.Y., Park, J,Y., and Cho, M.G., 2017, 커팅과 스플리팅을 이용한 암반노두 제거방법 및 이에 사용되는 커터기, KR Patent 1787966 B1, Oct. 13, 2017.

Choi, B.H. and Yang, H.S., 2001, A Study on the Deep Kerfing Technique in Rock Using High Pressure Water Jet, Explosives and Blasting, Vol19, 247-258.

Jeong, E.S. and Ko J.P., 2015, 무진동 암반 파쇄장치, KR Patent 1543437B1, Mar. 30, 2015.

Kim, J,G. and Song, J.J., 2015, Abrasive water jet cutting methods for reducing blast-induced ground vibration in tunnel excavation, International Journal of Rock Mechanics and Mining Sciences, 75, 147-158. 10.1016/j.ijrmms.2014.12.011

Ko, T.Y., Kim, T.K. and Lee, D.H., 2019, Determination of Mode I Fracture Toughness of Rocks Using Wedge Splitting Test, Tunnel and underground space, 29(6), 523-531.

Lee, J.H., Ahn S.K., Lee K.C., Bang C.S. and Sagong M., 2015, Study on a Wire Saw Rock Cutting Model for Tunnel Excavation and Cutting Performance Improvement, Transactions of the KSME A, 39(10), 1069-1077. 10.3795/KSME-A.2015.39.10.1069

Lee, Y.G., 2004, 진동 암반파쇄기용 브라켓 장치 및 이를 이용한 암반굴착 방법, KR Patent 478029B1, May.31, 2004.

Ministry of Environment, 2011, Investigation of Construction Machinery Noise and Vibration Ministry of Science and ICT, 2018, Development of Rock cutting attachment for 30 tonf excavator.

Oh, T.M. and Cho G.C., 2012, Effects of geometric parameters of a combined nozzle for rock cutting using an abrasive waterjet, Journal of Korean Tunnelling and Underground Space Association, Vol.14(5), 517-528. 10.9711/KTAJ.2012.14.5.517

Park, J.W. and Kim H.E., 2006, Test System for Measuring the Impact Energy of a Hydraulic Breaker, Journal of Drive and Control, 3(1), 27-31.

Park, J.W., Lee K.W., and Kim H.E., 2007, A Study On the Analysis Of Impact Strain for Hydraulic Breaker Chisel, Journal of Drive and Control, 4(4), 107-113.

Seo, B.S., Lee K.H., 2016, Stress Concentration Factor and Stress Intensity Factor with U-notch and Crack in the Beam, Transactions of the KSME A, 40(5), 513-523. 10.3795/KSME-A.2016.40.5.513

Seoul Metropolitan Government Climate & Environment Headquarters Citizens' Environmental Cooperation, 2016, 도시 소음관리 매뉴얼 (공사장소음).

Song, C.H., Kim, D.J., Chung, J., Lee, K.W., Kweon, S.S., and Kang, Y.K., 2017, Estimation of impact loads in a hydraulic breaker by transfer path analysis, Shock and Vibration, 1(15). 10.1155/2017/8564381

Won, Y.H., Kang C.W., and Ryu C.H., 2006, The Study of noise and vibration on application of the method breaking & excavating rock(Super wedge), Proceedings of the KSEE Conference, 167-184.

Yoon, B.J., Lee K.S., Lim H., Lee H.Y., Lee M.G., Kwon H.J., Kim K.T., and Joo J.M., 2017, Research of Hydraulic Breaker with Rock Properties Predictability Using the ICT, Transactions of the KSME, A, 41(7), 683-689.

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 : 31
No :6
Pages :415-427
Received Date :2021. 11. 30
Revised Date :2021. 12. 21
Accepted Date : 2021. 12. 21
DOI :https://doi.org/10.7474/TUS.2021.31.6.415

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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