DAMAGE EVOLUTION OF UNIAXIALLY COMPRESSED HONG KONG GRANITE
- 出版年：2003
- 作者：Yu F；ThamLG；LeePKK
- 单位1：Rock Engineering Research Center
- 语种：中文
- 作者关键词：rock mechanics；damage degree；Hong Kong granite；numerical simulation
- 起始页：2019
- 总页数：9
- 刊名：岩石力学与工程学报
- 是否内版：否
- 刊频：月刊
- 创刊时间：1982
- 主办单位：中国岩石力学与工程学会
- 主编：冯夏庭
- 地址：武汉市武昌小洪山
- 邮编：430071
- 电子信箱：kjwang@public.wh.hb.cn
- 网址：//yslx.chinajournal.net.cn
- 卷：22
- 期：12
- 期刊索取号：P478.066357
- 核心期刊：全国中文核心期刊；中国科协优秀期刊；湖北省优秀期刊；EI摘要收录期刊
摘要
An investigation is reported on the characteristics of progressive failure of Hong Kong granite. Uniaxial compression tests are performed on a number of Hong Kong granite specimens with the MTS 815.04 testing machine. Acoustic emission signals are recorded to trace the evolution of damages. Parametric studies on the effect of grain size are attempted. The results show that the increase in grain size will reduce the brittleness during failure. In addition, discussion，is extended to the grain size effect on the stress thresholds of crack closure, crack initiation and crack damage. TheRFPA2D code is also used to observe the failure characteristics of brittle rocks such as granite. Microscopic tensile failure is dominant in the ultimate failure of all the uniaxially compressed models. The crack initiation threshold is also determined by the numerical approach. The failure of coarse-grained models seems more ductile.