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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2635-08
基于PFC3D单轴压缩下含2条裂隙试样力学行为的数值分析
范祥1, 2,曹平1

(1. 中南大学 资源与安全工程学院,湖南 长沙,410083;
2. 长安大学 公路学院,陕西 西安,710064
)

摘 要: 基于离散元数值分析软件PFC3D中的颗粒接触黏结模型,以校核试验数据的方式获得数值模型的细观参数,进一步建立含有2条裂隙的数值计算模型,分别设定岩桥倾角为15°,30°,45°,60°,75°和90°。研究岩桥倾角对裂隙试样的峰值强度、起裂应力、峰值强度时刻轴向应变、弹性模量和破坏模式的影响。研究结果表明:岩桥倾角对含2条裂隙试样弹性模量的变化影响极小,但对峰值强度和起裂应力具有较大影响;随岩桥倾角的变化,裂隙试样单轴抗压强度与起裂应力有相似的变化关系,岩桥倾角影响裂隙试样在峰值应力时的应变。另外,岩桥倾角影响单轴荷载下裂纹的扩展方式,60°岩桥最容易贯通,15°和90°岩桥最难贯通。

 

关键词: 数值模拟;PFC3D;裂隙;岩桥;裂纹扩展

Numerical analysis of mechanical behavior of rock sample with two flaws under uniaxial compressive loading based on PFC3D
FAN Xiang1, 2, CAO Ping1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. School of Highway, Chang’an University, Xi’an 710064, China

Abstract:Based on the contact-bonded model in Particle Flow Code 3D, a discrete element method software, a numerical model with two flaws was established and the micro-parameters for this model were obtained by calibrating experimental data. The slant angle of rock bridge was set to the degrees from 15° to 90° with an interval of 15°. The effect of rock bridge angle on peak strength, crack initiation stress, elastic modulus, failure mode and strain at the point of peak stress was investigated. The results show that for the numerical rock sample with two flaws, the slant angle of rock bridge has little influence on elastic modulus, but major influence on peak strength and crack initiation stress. As slant angle of rock bridge changes, the changing relation between uniaxial compressive strength and rock bridge angle is similar to that between crack initiation stress and rock bridge angle. Rock bridge angle has some effect on the strain at the point of peak strength and crack propagation, and it is easy to coalesce for 60° rock bridge but hard for 15° and 90° rock bridge.

 

Key words: numerical simulation; PFC3D; flaw; rock bridge; crack propagation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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