岩石圧砕片の粒度分布と消費エネルギーに関する一考察

1.はじめに

2.試料岩石と試験方法

3.圧砕片の粒度分布

4.荷重−変位線図と消費エネルギー

5.考察

  5.1 試験条件が粒度分布におよぼす影響

  5.2 掘削体積比エネルギーとの関係

6.まとめ

参考文献

キーワード: 岩石,一軸圧縮,圧砕片,ワイブル分布, 粒子径,掘削,掘削体積比エネルギー


A Consideration on Particle Size Distribution of Fragments and Energy Required in Uniaxial Compression Tests

Abstract

Five rocks were compressed and crashed up to 20% of the initial height and the fragments were collected and sieved. The main results are summarized as follows:

(1)Particle size distribution of fragments follows the mixed Weibull distribution depending on the grain sizes of rock.

R = R1+R2+R3

Ri = Wi exp{ - (dp/dei)n }

R is the weight percentage retained on the sieve of aperture dp, and de is the absolute size constant (de1<de2<de3 ).

(2)In case of Akiyoshi marble, weighing function W2  is nearly zero. Except Akiyoshi marble, all other four rocks show the similar particle distribution trend in which W is considerably larger than  W1 .

(3)End-surface condition, moisture and size effect of rock specimen has only small influences on the particle size distribution.

(4)Energy required during testing has close relationship with the size distribution of fragments.

KEY WORDS: Rock, Uniaxial Compression, Fragment, Weibull distribution, grain size, Excavation, Specific Energy