摘要
采用自行研制的可对同一岩石试样进行单轴压缩和直接拉伸的试验装置,对3种岩石进行了压缩和直接拉伸试验。结果表明,这3种岩石的压缩弹性模量均大于拉伸弹性模量,压缩与拉伸弹性模量之比分别为1.1,1.4,2.5。压缩泊松比也大于拉伸泊松比。研究表明:直接拉伸下切线泊松比随荷载的增加而减小,与压缩下泊松比的变化相反。
Laboratory tests of direct tension and compression were conducted for three rock types with a testing unit that can perform both compression and direct tension on a same rock sample. The results showed that for most rock samples, the obtained Young＇s moduli in compression Ec were greater than those in tension E~. For Gaofeng limestone, the Ec/Ex ratio was 1.1; for Gaofeng pyrite, the ratio was 1.4; and for Songshujiao marble, the ratio was 2.5. The average values of Poisson＇s ratios in compression were also greater than the values in tension. It was also found that the tangent Poisson＇s ratios in tension decreased with the increasing applied loading, which was opposite to the behavior in compression.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第1期18-22,共5页
Rock and Soil Mechanics
基金
云南省自然科学基金课题(No.96E033M)
关键词
岩石
直接拉伸
压缩
弹性模量
泊松比
rock
direct tension
compression
Young＇s modulus
Poisson＇s ratio
