2, 3の本邦岩石に対する間隙水圧効果
封圧下における岩石の力学的性質に関する実験的研究
1982 年 98 巻 1131 号 p. 393-398
詳細
1982 年 98 巻 1131 号 p. 393-398
The effect of pore pressure on the mechanical behaviour of rocks has been investigated in order to confirm the validity of the effective confining pressure law among rocks with various properties and textures. The triaxial compression tests of Noboribetsu tuff, Horonai sandstone and Akiyoshi marble were carried out with servo-controlled facilities for confining pressure and pore pressure combined with a conventional hydraulic testing machine. The stress strain curves of the three kinds of rocks were determined over the full range of deformation involving both pre-and post failure regions under the condition of confining pressure and pore pressure extending up to 700kg/cm2.
The experiment showed that the effective confining pressure law was valid for Noboribetsu tuff and Horonai sandstone but the fracture criterion of Akiyoshi marble was scarecely explained by this hypothesis at the strain rate of 6×10-5/sec. Since the tuff and the sandstone were more porous and permeable than the marble, this hyposesis seems to be more realistic to rocks whose pores are fully interconnected. Concerning the marble the effective confining pressure law may be gradually valid with the decrease of strain rate.
