http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effect of Water Jet Geometric Parameters on Rock Fracturing
오태민,Awlia K. Prasidhi,조계춘,신종호 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.3
Fluid-driven rock fracturing has been attempted in the fields of mining and civil engineering. This type of rock fracturing isinitiated by applying high-pressure water to target rock. In this study, the fracturing characteristics of hard granite specimens wereexplored through experimental tests using a high-pressure water jet system. Various tests were performed to evaluate the effects ofseveral geometric parameters: standoff distance, indentation depth, and free surface condition. The fracture depth, radius, volume,and angle were measured, and then analyzed to investigate the fracturing characteristics. In addition, we prepared a theoreticalestimate of maximum shear stress via shear stress analysis using a crack-tip stress field model. In these experimental and theoreticalstudies, efficient rock fracturing was demonstrated with a combination of short standoff distance, deep indentation, and nearby freesurfaces. Meanwhile, the fracture angle for infinite free surface boundary specimens was identified as a unique value regardless ofthe standoff distance and indentation depth.