Shigen-to-sozai, Vol.118, No.3,4, pp.165-170.
Development and Preliminary Use of a Transparent Vessel for Tri-axial Compression Test of Rock
Seisuke OKUBOa, Katsunori FUKUIa and Kimihiro HASHIBAa
| a. Department of Geosystem Engineering. The University of Tokyo |
| In soil mechanics, a transparent tri-axial
vessel is frequently used, however, in rock
mechanics, a metal vessel has been used to
withstand higher confining pressure. In this
study, a transparent vessel made of an acrylic
acid resin with tensile strength of 75 MPa
was designed and manufactured for tri-axial
compression test under confining pressure
up to 10 MPa. Every component of the vessel was designed with safety factor more than four. Paying special attention to safety, confining pressure was increased over the designed value until its failure. The confining pressure at the failure was more than 55 MPa and daily use at 10 MPa was considered to be safe. It was also revealed that an annular transparent tube made of an acrylic acid resin did not break into pieces, but only a vertical crack was extended. Preliminary tri-axial tests were conducted for Tage tuff and Dotan that were deformed easily under the confining pressure. Many photographs were taken by a digital camcra, and vcrtical and lateral deformations / strains were read out successfully. |
| KEY WORDS: Rock, Tuff, Dotan, Visualization. Triaxial Compression Test, Dilatancy |