岩石の三軸圧縮試験用可視化ベッセルの開発と試用

1.はじめに

2.可視化ベッセル

 2.1 可視化ベッセルの概要

 2.2 安全性と破壊試験

3.測定方法

4.試用結果

 4.1 田下凝灰岩での結果

 4.2 土丹での結果

5.考察とまとめ

参考文献

キーワード:岩石,凝灰岩,土丹,可視化,三軸圧縮試験,ダイラタンシー


Development and Preliminary Use of a Transparent Tri-axial Vessel

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 camera, and vertical and lateral deformations/strains were read out successfully.

Key Words: Rock, Tuff, Dotan, Visualization, Triaxial Compression Test, Dilatancy