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• 工程地质学 • 上一篇    下一篇

含偏置裂纹的三点弯曲梁破坏过程颗粒流模拟

丁永政,邓清海,刘兆冰,李宏   

  • 出版日期:2019-08-20 发布日期:2019-09-02

Particle Flow Simulation of Failure Process of Three-Point Bending Beams with Bias Cracks

DING Yongzheng,DENGQinghai,LIU Zhaobing,LI Hong   

  • Online:2019-08-20 Published:2019-09-02

摘要: 为研究三点弯曲梁在荷载作用下的破坏模式,采用颗粒流程序PFC2D对含不同位置和高度的预置裂隙的三点弯曲
梁破坏过程进行了模拟。结果表明:预制裂隙的长度与位置共同影响梁的破坏;当预置裂隙的位置离加载点较远时,主
要是预置裂隙的高度对梁的破坏产生影响,当裂隙高度超过70 mm时,试件的破坏模式发生变化;当预置裂隙高度一定
时,预置裂隙的位置是试件发生破坏的主要影响因素,当距离支撑点的距离超过100 mm时,试件的破坏模式发生了改
变;试件的破坏过程伴随着能量的积累和释放。相比较于有限元法和有限差分法,离散元法能更好的模拟出材料裂隙产
生和发展的过程。

关键词: 三点弯曲梁, 偏置裂纹, 颗粒流模拟, 破坏过程

Abstract: In order to study the failure mode of three-point bending beams under load, the failure process of three-point bending beams
with preset cracks at different locations and heights were simulated with particle flow code PFC2D. The simulation results show that the
length and location of prefabricated cracks affect the damage of beams together. When the location of prefabricated cracks is far from
the loading point, the height of prefabricated cracks is the main factor affecting the damage of beams. When the height of cracks
exceeds 70 mm, the failure mode of specimens changes. When the height of prefabricated cracks is fixed, the location of prefabricated
cracks is the main factor affecting the failure of specimens. When the distance from the support point exceeds 100 mm, the failure
mode of the specimens changes, and the failure process of the specimens are accompanied by the accumulation and release of energy.
Compared with the finite element method and the finite difference method, the discrete element method can better simulate the process
of material crack generation and development.

Key words: three-point bending beam, bias cracks, particle flow simulation, failure process