摘要
岩石力学参数受其组成材料的细观力学性质和含有的裂隙控制。本文采用颗粒流方法,以校核试验参数的方法确定模型细观参数,进而建立不同高度和半径的圆柱模型,然后根据试样体积,在模型中添加不同数量的随机分布裂隙,研究裂隙对宏观力学性质的控制作用,发现:1)对于不含有裂隙的试样,圆柱试样的高度和半径对单轴抗压强度和弹性模量的影响较小,但试样半径对宏观力学性质的影响比高度明显;2)对于含有裂隙的试样,试样单轴抗压强度和弹性模量受试样半径和高度影响明显,表现为单轴抗压强度和弹性模量随高度或半径增加而呈现指数形式衰减;3)不同尺寸的裂隙试样应力-应变曲线在峰值轴向应力之前,曲线斜率与试样尺寸有较为明显的相关性。
Mechanical parameters are mainly controlled by the micro-mechanical properties of component and cracks within rock. In the current study, particle flow code approach was employed and calibration method was used to determine the mi- cro-parameters which were employed in the numerical models with different heights or different radii respectively. And vari- ous numbers of cracks were randomly added into different models according to the volume ratio of various size specimens. The influences of cracks within model on macro-properties were investigated, and the following conclusions were found： 1 ） for the samples without cracks, height and radius of cylindrical sample have little impact on uniaxial compressive strength and Young＇s modulus, but sample radius has a little more influences than sample height does;2） For the samples with cracks,uniaxial compressive strength and Young＇s modulus are strongly dependable on sample size including height and ra- dius,which is that uniaxial compressive strength and Young＇s modulus drop in an exponential way with sample height or ra- dius increasing;3） Prior to the peak uniaxial stress of stress-strain curves for differently sized samples with cracks, the curve slope is obviously related to sample size including height and radius.
出处
《世界科技研究与发展》
CSCD
2015年第4期359-363,共5页
World Sci-Tech R&D
基金
国家自然科学基金(51008309)资助
关键词
颗粒流
细观参数
裂隙
试样尺寸
宏观性质
particle flow code
micro-parameter
crack
specimen size
macro-property
