摘要
利用颗粒流软件构建了裂隙岩石的单轴压缩模型,模拟了含共面断续裂隙岩石的单轴压缩试验,并分析了裂隙倾角、裂隙长度、岩桥长度、裂隙摩擦系数对岩石破坏特征的影响。结果显示,上述4种因素对岩石破坏模式都存在影响,主要出现的破坏模式有:类完整岩石破坏模式、宏观剪切破坏模式、宏观张拉-剪切复合破坏模式、过渡型破坏模式。岩石峰值强度与裂隙倾角呈现出非线性特征,相对于裂隙长度呈现单调递减的趋势,相对于岩桥长度的曲线呈现上凸形态,相对于裂隙摩擦系数呈现单调递增的趋势。
Particle flow code is used to construct a model for uniaxial compression test of cracked rock. The test was simulated with specimens containing coplanar nonpersistent fissures. The effects of fissure dip angle,fissure length,length of rock bridge and friction coefficient of fissure on the failure characteristics of rock were analyzed. The results show that the four factors mentioned above all have effect on the failure mode of rock. The main failure modes include failure mode like intact rock,macroscopic shear failure mode,macroscopic tensile and shear composite failure mode and transitional failure mode. Peak strength of rock has nonlinear relationship with fissure dip angle,which decreases with the increase of fissure length,and increases with the increase of friction coefficient of fissure. The curve of peak strength of rock relative to fissure length has a convex shape.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第4期892-898,共7页
Chinese Journal of Underground Space and Engineering
关键词
共面断续裂隙
单轴压缩
颗粒流
破坏模式
峰值强度
coplanar nonpersistent fissure
uniaxial compression
PFC
failure mode
peak strength
