岩石力学性质的应变率效应试验

发布时间：2018-06-04 03:20

本文选题：岩石力学 + 应变率　；参考：《地质与勘探》2017年05期

【摘要】：以玄武岩为试样,开展了中低应变率下的岩石单轴抗压试验。本次研究分析应变率对岩石抗压强度、弹性模量、泊松比等力学参数的影响,分别提出了岩石抗压强度、弹性模量、泊松比等参数与应变率之间的拟合关系式。以峰值应力对应的应变和峰值后的软化模量为脆性评价指标,分析加载应变率对岩石脆性的影响。研究表明:(1)岩石抗压强度、弹性模量均随应变率的增加而增加。(2)岩石泊松比随应变率增加而减小。(3)随着应变率增加大,峰值应力对应的应变增大,峰值后的应变软化程度减小,岩石脆性减弱。(4)应变率对岩石抗压强度影响较大,对弹性模量和泊松比的影响较小。(5)曲线拟合效果良好,提出的拟合关系式合理。
[Abstract]:The uniaxial compressive tests of basalt at low strain rate were carried out. The influence of strain rate on the compressive strength, elastic modulus and Poisson's ratio of rock is analyzed, and the fitting relation between the parameters of rock compressive strength, elastic modulus and Poisson's ratio and strain rate is put forward. Based on the strain corresponding to the peak stress and the softening modulus after the peak value, the effect of loading strain rate on the brittleness of rock is analyzed. The results show that the compressive strength and elastic modulus of the rock increase with the increase of strain rate. The Poisson's ratio decreases with the increase of strain rate, and the strain corresponding to the peak stress increases with the increase of strain rate, and the strain softening degree decreases after the peak strain rate increases. The strain rate has great influence on the compressive strength of rock, and has a good effect on the elastic modulus and Poisson's ratio. The fitting formula is reasonable.
【作者单位】：湖南理工学院土木建筑工程学院;中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51308210)资助
【分类号】：TU45

【相似文献】