Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Estimating and Analyzing the Appropriate Pressing Force of the Rock Cutting Splitting Method

암반 커팅 스플리팅 공법의 적정 압입력 추산을 위한 분석해

  • Received : 2021.11.30
  • Accepted : 2021.12.21
  • Published : 2021.12.31
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Abstract

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.

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.

Keywords

Acknowledgement

본 연구는 2021년도 국토교통부(국토교통과학기술진흥원) 국토교통기술사업화지원사업의 '암반커팅과 스프리팅 공법을 이용한 암반 터널 저진동 굴착기술개발(21TBIP-C160989-01)'을 통해 수행되었습니다.

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