Shear failure development in compacted bentonite specimens

被引：0
|
作者：
Kodaka, Takeshi [1 ]
Teramoto, Yuko [1 ]
Hirate, Toshio [1 ]
Motoyoma, Yasuhisa [1 ]
Higo, Yosuke
Oka, Fusao
机构：
[1] Meijo Univ, Dept Civil Engn, Nagoya, Aichi, Japan
来源：
GEOMECHANICS AND GEOTECHNICS: FROM MICRO TO MACRO, VOLS 1 AND 2 | 2011年
关键词：
geological disposal; buffer material; compacted bentonite; direct shear test; shear band; X-ray CT;
D O I：
暂无
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Compacted bentonite is planned for use as a buffer material in the geological disposal of the high-level radioactive waste. In the present paper, in order to study the failure behavior of the compacted bentonite, a series of constant volume direct shear tests was performed. In addition, the insides of the sheared specimens were observed with a micro-focus X-ray CT scanner. The over-consolidated unsaturated compacted bentonite specimen shows brittle failure behavior from an early stage of shearing. A shear band with a number of large cracks developed during shearing in the unsaturated compacted bentonite. On the other hand, according to the results of direct shear test for the saturated compacted benonite specimen, the shear resistance of the compacted bentonite decreases with their saturation. In addition, no cracks were generated in shear band zone of the saturated specimen.
引用
收藏
页码：29 / 33
页数：5
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