摘要
介绍了一种可对同一岩石试样分别进行单轴压缩和单轴拉伸实验的试验装置,该装置改变了因岩样不同而导致的压拉试验结果无法进行直接对比分析的现状,为岩石从受压转向受拉或从受拉转向受压的过渡特性的试验研究提供了可能。以云南大姚铜矿紫色砂岩为例,研究了其在压拉试验条件下的变形特性。结果表明:该种岩石从压缩到拉伸阶段弹模变化不大,但压缩泊松比与拉伸泊松比的变化较为复杂。试验同时证明该类岩石的压缩与拉伸并不是截然不同的两种过程,单轴压缩试验的卸载曲线与直接拉伸试验的加载曲线具有很好的连续性。
A testing apparatus is introduced which can carry out both uniaxial compression tests and uniaxial tension tests on a same rock. This apparatus changes the situation of analyzing the test results from different rock samples under uniaxial compression and uniaxial tension respectively, which will lead to a wrong conclusion. And it also provides the possibility for studying the transitional characteristic of rock from being compressed to being sketched or from being sketched to being compressed. Furthermore, the deformation behavior of purple sandstone in Dayao Copper Mine is studied. The research indicates that the compressive elastic modulus of purple sandstone equals to the tensile elastic modulus, but the changes of Poisson＇s ratio in compression and that in tension are complicated. The tests also prove that rock compression and tension are not quite different courses. The deformation curve of unloading in compression joins continuously together with that of loading in tension.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第10期2155-2160,共6页
Rock and Soil Mechanics
关键词
岩石
直接拉伸
单轴压缩
变形特性
rock
direct tension
uniaxial compression
deformation behavior
