摘要
在刚性压力机上,应用动态应变仪、应力传感器、位移传感器等仪器对花岗岩进行单轴压缩实验。得到了花岗岩破裂过程的全应力-应变曲线。通过对全应力-应变曲线的分析表明:试样变形特征基本上是一致的,都经历了初始压密、弹性变形、裂纹初始、裂纹稳定扩展、裂纹不稳定发展直到破裂五个阶段。通过对试样峰值前的受力变形特点的观察,发现试样接近其峰值强度时,出现了一小段应力增长缓慢,而相对应的应变量明显增加的塑性变形阶段,可进一步研究岩石破裂失稳机理及其失稳前兆信息。
Deformation experiments of granite are carried out on stiffness test machine by dynamic strain instrument,pressure（displacement） sensor,and other equipments.Full-regime curves are obtained.The results show that the deformation characteristics of all the samples basically conformity,all these samples undergo five stages： initial compression,elasticity deformation,crack initial,crack steady growth and crack astable growth to failure.Through the observation of loading deformation characteristics before peak value,the phenomenon is found that when the curve is near to the peak,appear a stage of plastic deformation,which the tress slowly increase but the corresponding strain obviously increase.This is significance to further studies on the mechanics of rock instability failure and the premonition information of failure.
出处
《有色矿冶》
2011年第1期16-17,共2页
Non-Ferrous Mining and Metallurgy
关键词
单轴压缩
花岗岩
变形
岩石破坏
uniaxial loading
granite
deformation
rock failure
