Study on rock reinforcement process and the effect of produced strength right after rockbolt installation

록볼트의 타설 직후의 강도발현 과정 및 효과에 관한 연구

  • 이토 준 (삼성물산(주)건설부문 토목사업본부 토목기술팀) ;
  • 박해균 (삼성물산(주)건설부문 토목사업본부 토목기술팀) ;
  • 김동완 (삼성물산(주)건설부문 토목사업본부 토목기술팀) ;
  • 김재권 (삼성물산(주)건설부문 토목사업본부 토목기술팀)
  • Published : 2003.06.01


For the huge section of tunnel, it is highly required to observe the role of each rock support and their effect of rock reinforcement in order to investigate more reasonable rock support structure. Especially for unstable tunnel situation with no shotcrete strength right after an excavation, sufficient investigation is needed for rock support structure. In this paper, we clarify the relations of compressive strength and material age, cohesion strength and material age, and cohesion stiffness and material age of grout with time-dependence through tests and numerical analysis simulation with trial rock mass considering hardening of bolt grouting material. By means of this process, effect of rock reinforcement for rockbolt is investigated right after an excavation and modelling and physical constants of young aged rockbolts are obtained. Additionally, the effect of rock reinforcement with hydraulic tensile friction bolt is examined right after an excavation, which grout effect is no need to be waited.