경량 고강도 강관 록볼트의 지보특성에 관한 연구
A Study on the Support Characteristics of the High Strength Lightweight Steel Pipe Rockbolt
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초록
본 연구에서는 특수 재질의 경량 고강도 강관 록볼트를 개발하였다. 그라우트 주입확인시험을 실시하여완전충전이 이루어지는지 알아보았고 인장시험을 통해 항복내하력을 조사하였으며 이를 기존의 이형봉강 록볼트와 비교하였다. 또한, RMR 분류등급이 서로 다른 국내 3개 현장에서 실시한 현장인발시험을 통해 본 록볼트의강도 및 신장특성을 확인하였다. 개발된 록볼트는 이형봉강 록볼트에 비해 항복내하력이 클 뿐 아니라 경량이라취급이 용이하며, 그라우트 완전충전 효과에 따라 부식성 환경에서 내구성이 클 가능성이 있는 것으로 생각된다.
Abstract
In this study, a steel pipe type rockbolt manufactured from special material was developed which hashigh strength and lightweight characteristics. Achievement of grout filling between rockbolt and hole wall wasinvestigated through grout injection tests. Yield force of the developed rockbolt was also examined through tensiletests, which was compared with that of the deformed bar type rockbolt. In addition, the strength and elongationproperties of the developed rockbolt were investigated through pull-out tests at three domestic sites showing differentRMR classes. It is finally supposed that the developed rockbolt can be suitable for the permanent tunnel supportbecause it has high strength and high durability rather than deformed bar type rockbolt.
참고문헌 (9)
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