Effect of Intermediate Principal Stress on Failure of Rocks and Failure Condition of Rocks under Multiaxial Stresses

• Published in: Journal of the Japan Society of Engineering Geology Vol. 27; no. 1; pp. 13 - 20
• Main Authors: FURUZUMI, Mitsumasa, SUGIMOTO, Fumio
• Format: Journal Article
• Language: English
• Published: Japan Society of Engineering Geology 1986
• ISSN: 0286-7737; 1884-0973
• DOI: 10.5110/jjseg.27.13

In order to investigate the effect of the intermediate principal stress on failure strength of rock and failure condition of rock under the multiaxial stresses, the true triaxial compression tests are carried out on two kinds of rocks, namely KIMACHI sandstone and OGINO tuff. For this test, a true triaxial compression testing machine using the cubic specimen was designed as shown in Fig. 2 and Photo. 1. The main results obtained in this study are summarized as follows; From the experimental results under the various combined triaxial compressive stresses, it becomes clear that the intermediate principal stress has an effect on the failure strength of rock, and the degree of its effect on the failure strength of rock is different for each rock. Also, under the multiaxial stresses including tension to compression stress field, the failure condition of rock can be expressed by Murrell's criterion rather than Drucker-Prager's one.