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。
Uniaxial compressive tests of basalt were carried out under low-medium strain rate loading. The effects of strain rate on mechanical parameters,including compressive strength,elastic modulus and Poisson＇s ratio,were analyzed based on the test results,and the fitting relationships between those mechanical parameters and strain rate aere proposed respectively. The stain corresponding to the peak stress and the softening modulus were used as the two indexes for evaluating the brittleness of rock. The results obtained by the tests show that as follows：（ 1） Both the uniaxial compressive strength and the elastic modulus increase with the strain rate.（ 2） The Poisson＇s rate decreases with the strain rate.（ 3） With the increase of strain rate,the staincorresponding to the peak stress increases,while the rock mechanical properties of strain softening and brittleness become weak.（ 4） The influences of the strain rate on the uniaxial compressive strength are great,while the influences on both the elastic modulus and the Poisson＇s rate are small.（ 5） The results of curve fitting are good,and the proposed relationships for fitting curves are reasonable.
出处
《地质与勘探》
CAS
CSCD
北大核心
2017年第5期1025-1031,共7页
Geology and Exploration
基金
国家自然科学基金资助项目(51308210)资助
关键词
岩石力学
应变率
单轴抗压强度
弹性模量
泊松比
rock mechanics
strain rate
uniaxial compressive strength
elastic modulus
Poisson＇s rate
