刃物間隔を考えたさく岩機用ボタンチップの静的貫入試験

概要

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A proper testing method to examine tha effect of spacing on penetration depth has not been established up to now. In this study, a simple testing method was proposed in which a button chip was penetrated on flat surface of a sample rock, 25 times in five by five square pattern. When applied force was relatively small, solitary penetration holes on rock surface were made at pre-determined spacings or intervals. When higher force was applied, rock between holes was chipped away or broken completely and holes were connceted each other to produce a large excavated region covering all testing area. Through comprehensive testing schedule, followings were found ; 1. Required force to penetrate a certain depth is proportional to square root of the chip diameter. 2. For Sanjome andesite and Kimachi sandstone, penetration depth approximately follows an equation with three constants ‹a’, ‹n’ and ‹c’; (depth)=a(force)/(chip diameter)0.5-b(spacing)sn-c, where ‹n’ takes a value between 1.5〜2.0. 3. For Inada granite, penetration depth follows and equation; (depth)=a(force)/{(chip diameter)0.5(spacing)0.5}-c.
1999-09-25