低应变率范围下花岗岩力学特性研究

Study on Mechanical Properties of Granite within Range of Low Strain Rate

本文利用岩石三轴流变仪对花岗岩进行了1.5×10^(-7)~4.3×10^(-6)s^(-1)应变率下的单轴压缩试验,对花岗岩的力学特性及破碎程度进行了研究。试验结果表明在低应变率范围下,花岗岩的强度、弹性模量等力学参数随着应变率的增加有着较大幅度的增加;利用分形维数对花岗岩破碎程度进行探究,发现花岗岩在低应变率下的块度分布具有分形特征,且应变率与岩石破碎程度具有较强的负相关性。

A rock triaxial rheometer has been used to carry out the uniaxial compression test of granite under the strain rate ranging from 1.5×10^(-7) to 4.3×10^(-6)s^(-1),which produces the mechanical properties and fragmentation of granite.The results show that the compression strength,elastic modulus and other mechanical parameters of granite increase to a high extent with the increment of strain rate.The fractal dimension is used to investigate the fragmentation of granite,which shows the fractal characteristics of fragmentation distribution of granite under low strain rate,and strong negative correlation between strain rate and fragmentation degree.