岩石の力学的挙動と破壊について (第1報)
圧縮における試験片の形状効果と寸法効果
1961 年 77 巻 876 号 p. 377-382
詳細
1961 年 77 巻 876 号 p. 377-382
The authors have made a series of researches concerning the mechanical behaviors and the breaking mechanism of some rocks under uniaxial compression.
In this paper, we report how compressive strength and fracturing pattern of rock specimens vary with their slenderness ratios and dimensions.
The following results are concluded;
(1) the breakage of rocks by compression is the combined result of shearing and teusile fractures;
(2) and consequently, a new relationship between compressive strength and slenderness ratio of rock specimens is proposed:
σc= α+β· d/h+γ· h/d (α, β, γ=const.)
(3) Increasing dimensions of a rock specimen, some factors, such as Griffith's cracks in a specimen, act to decrease its compressive strength, as the dimensions of the rock specimen are increased, whereas others, e. g. change of stress distribution, act inversely.
(4) Therefore, the fracturing stress is almost constant for different volume of rock specimens.
