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

1.はじめに

 主な記号

2.貫入力に関する従来の研究

 2.1 静的貫入試験

 2.2 ディスクカッタによる圧砕

 2.3 切削

 2.4 過去の研究のまとめ

3.貫入試験

 3.1 試験方法

 3.2 三城目安山岩の貫入試験結果

 3.3 来待砂岩の貫入試験結果

 3.4 稲田花崗岩の貫入試験結果

4.考察

5.まとめ

参考文献

キーワード: 岩石,さく岩機,ボタンビット,貫入試験,刃物間隔


Static Penetration Test of Button Chip for Rock Drill Focused on Effect of Spacing

Abstract

A proper testing method to examine the 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 connected 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)s - c,
where 'n' takes a value between 1.5-2.0.

3. For Inada granite, penetration depth follows an equation;
(depth) = a (force)/{(chip diameter)0.5 (spacing)0.5} - c .

KEY WORDS: Rock, Rock Drill, Button Bit, Penetration Test, Spacing