워터젯 절삭폭 중첩에 따른 암반제거 단면형상 분석
Analysis of rock removal shape according to overlapping width of waterjet cutting
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초록
터널굴착의 경제성 확보 및 굴착 시 발생하는 진동저감을 위해 워터젯 시스템을 활용한 새로운 형태의 암반 굴착공법이 개발되고 있다. 워터젯 절삭을 이용한 효율적인 암반 굴착을 위해서는 워터젯 절삭폭의 중첩과정이 필수적이다. 본 연구는 초고압 연마재 워터젯 시스템을 이용하여 절삭폭 중첩도 및 이격거리에 따른 화강암 시편 절삭실험을 수행하였다. 실험결과를 바탕으로 중첩도 단계에 따른 화강암 절삭성능을 분석하였다. 그리고 형상인자를 절삭깊이, 절삭폭, 그리고 절삭부피로 분류하여 중첩 절삭 후 단면의 형상을 분석하였다. 절삭폭 중첩도가 58% 이하가 되면 중첩이 충분하지 않아 연속적인 암반제거가 불가능하였다. 반면 절삭폭 중첩도 67% 이상에서는 과절삭 현상이 확인되었다. 한편 부분중첩(25~75%) 조건에서는 기존 워터젯 절삭에 비해 효율적인 부피제거가 가능한 것으로 분석되었다. 해당 연구는 워터젯을 활용한 암반 굴착 시 최적 중첩도를 결정하기 위한 중요한 기초자료로 활용될 수 있을 것으로 기대된다.
Abstract
New type of rock excavation method using a waterjet system is being developed to secure economic feasibility and to reduce vibrations during excavation. In waterjet rock excavation, overlapping of cutting width is essential for high efficiency. In this study, cutting experiments for granite specimens were performed using abrasive waterjet system according to the overlapping ratio and standoff distance. Based on the experimental results, the granite cutting performance was analyzed according to the overlapping ratio. In addition, removal shapes of the cross-section were analyzed interms of the cutting depth, width, and volume after waterjet cutting. When the overlapping ratio is less than 58%, rock specimens are partially removed due to the insufficient overlapping ratio. However, when the overlapping ratio exceeds 67%, overcutting phenomenon is observed. For the partial overlapping ratio (i.e., 25~75%), cutting efficiency is increased in the removal volume. This study is expected to be used as the important basic data for determining the optimum overlapping ratio when the waterjet system is applied for rock excavation.
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