水资源与水工程学报2016，Vol.27Issue(6)：222-226,231,6.DOI:10.11705/j.issn.1672-643X.2016.06.40
应变率对上海安山岩强度和变形的影响
Influences of strain rate on the strength and deformation of Shanghai andesite
孙中明 1璩继立 1危鼎 2钱海波2
作者信息
- 1. 上海理工大学 环境与建筑学院，上海200093
- 2. 中国建筑第八工程局有限公司，上海200122
- 折叠
摘要
Abstract
In order to explore the impacts of strain rate on the intensity and deformation of Shanghai an-desite, six different strain rates (from 1 × 10 -5s-1 to 1s-1) were used in the experiments; three speci-men sizes were selected ( D = 38mm, L = 38mm;D = 38mm, L = 76mm;D = 58mm, L = 116mm) to study the effects of specimen sizes; the computer controlled servo rigid triaxial testing machine was used for specimen uniaxial compression tests. The results showed that: There was a critical strain rateεcr , when strain rate was lower thanεcr , rock peak stress and ultimate strain increased as the strain rate increased, otherwise, it declined;The aspect ratio had certain influences on the critical strain rateεcr , if the aspect ratio of the specimen was doubled, then the value ofεcr increased an order of magnitude;when the diameter of the specimen was constant, with the increase of the aspect ratio, there was an obvious in-crease in the peak stress of rock, however, the failure strain decreased significantly;when the aspect ra-tio was fixed, as the increase in size, peak stress decreased obviously, while the impact on the ultimate size of the strain was small.关键词
安山岩/应变率/试件尺寸/峰值应力/极限应变/安山岩强度Key words
andesite/strain rate/specimen size/peak stress/failure strain/strength of andesite分类
建筑与水利引用本文复制引用
孙中明,璩继立,危鼎,钱海波..应变率对上海安山岩强度和变形的影响[J].水资源与水工程学报,2016,27(6):222-226,231,6.
