三城目安山岩の三軸圧縮強度に及ぼすひずみ速度の影響
岩石の破壊および変形における時間依存性の研究 (第1報)
1983 年 99 巻 1140 号 p. 87-92
詳細
1983 年 99 巻 1140 号 p. 87-92
The effect of strain rate on the uniaxial and traxial compressive strength for Sanjome andesite is examined varying the strain rate from 0.85 to 850μ/sec. by a step of 10 fold change under the confining pressure up to 400kg/cm2.
The preliminary uniaxial compression test shows that:
(1) the uniaxial compressive strength decreases with only small increase of moisture content in the test piece.
Therefore, a special care has been taken in preparing specimen for the following test programme. The test results are as follows:
(2) the increment of differential stress at the strength failure point is revealed to be about 75kg/cm2 when the strain rate increased by a factor of 10;
(3) the square of the maximum principal stress at the strength failure point increases linearly with the confining pressure;
(4) the inelastic strain at the strength failure point increases linearly with the confining pressure. Though under a constant confining pressure, inelastic strain is almost constant regardless of strain rate.
