Modeling of Deformation-cracking Processes of Rock Specimens with V-shaped Notches in Uniaxial Tension——Based on a Continuum-discontinuum Method

王学滨; 陈忠元; 郭瑞; 郭翔; 芦伟男

doi:10.13409/j.cnki.jdpme.2018.02.002

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Modeling of Deformation-cracking Processes of Rock Specimens with V-shaped Notches in Uniaxial Tension——Based on a Continuum-discontinuum Method

更新时间：2025-12-11

- Modeling of Deformation-cracking Processes of Rock Specimens with V-shaped Notches in Uniaxial Tension——Based on a Continuum-discontinuum Method
- Vol. 38, Issue 2, Pages: 209-215(2018)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2018.02.002
  CLC： U45
- Published：2018
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[1]王学滨,陈忠元,郭瑞,郭翔,芦伟男.预设V形缺口的单向拉伸岩样变形-开裂过程模拟——基于连续-非连续方法[J].防灾减灾工程学报,2018,38(02):209-215.

王学滨, 陈忠元, 郭瑞, et al. Modeling of Deformation-cracking Processes of Rock Specimens with V-shaped Notches in Uniaxial Tension——Based on a Continuum-discontinuum Method[J]. 2018, 38(2): 209-215.
[1]王学滨,陈忠元,郭瑞,郭翔,芦伟男.预设V形缺口的单向拉伸岩样变形-开裂过程模拟——基于连续-非连续方法[J].防灾减灾工程学报,2018,38(02):209-215. DOI： 10.13409/j.cnki.jdpme.2018.02.002.

王学滨, 陈忠元, 郭瑞, et al. Modeling of Deformation-cracking Processes of Rock Specimens with V-shaped Notches in Uniaxial Tension——Based on a Continuum-discontinuum Method[J]. 2018, 38(2): 209-215. DOI： 10.13409/j.cnki.jdpme.2018.02.002.

摘要

利用自主开发的连续-非连续方法

通过在岩样左、右两侧预设V形缺口

开展了拉伸位移控制加载条件下岩样变形-开裂过程的数值模拟研究。研究发现:在节点分离前

最大主应力集中于V形缺口尖端附近;在节点分离后

最大主应力集中于裂缝尖端附近;岩样中节点分离是由外及里逐渐发生;由于岩样内部一定尺寸弹性核心的存在

即使岩样发生少许节点分离

岩样承载能力也不会下降

但刚度会劣化;在节点分离不久

分离节点的法向张开度和法向力均呈现一定的非线性

这可能与分离节点周围单元应力分布不均匀和未考虑切向力等因素有关;网格加密后

V形缺口的尺寸相应降低

这导致载荷-位移曲线的峰值提升

该曲线的峰前和峰后部分变陡;分离节点的法向张开度和法向黏聚力随时间的演变曲线几乎不存在网格依赖性。对文中的多种数值结果的正确性进行了检验。

Abstract

A continuum-discontinum method developed by the authors is used to numerically simulate the deformation-cracking processes of rock specimens with V-shaped notches in displacementcontrolled uniaxial tension tests.The following results are found.Prior to and beyond the nodal separation

the maximum principal stresses are concentrated at tips of notches and cracks.Separation of nodes in rock specimens is from the outside to the inside.If an elastic core with a certain size appears

the load-bearing capacity of the specimen may not decrease

but the stiffness decreases because several nodes have separated in the specimen.Shortly after nodes separated

normal forces and normal opening displacements of separating nodes exhibit non-linearity

which is possibly related to the nonuniform distribution of stress around the separating nodes and the neglect of the tangential force.After the mesh is refined

the maximum load-bearing capacity of the specimen increases and the pre-peak and post-peak parts of the load-displacement curve become steep.Normal force-time curves and normal opening displacement-time curves are almost size-independent.Numerical results are verified on several aspects.

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references

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