基于DIC的含不同角度3D打印
粗糙交叉节理试样破裂机制研究

doi:10.16285/j.rsm.2020.1006

岩土力学 ›› 2021, Vol. 42 ›› Issue (2): 439-450.doi: 10.16285/j.rsm.2020.1006

基于DIC的含不同角度3D打印粗糙交叉节理试样破裂机制研究

王本鑫^{1, 2}，金爱兵^{1, 2}，孙浩^{1, 2}，王树亮^{1, 2}

1. 北京科技大学金属矿山高效开采与安全教育部重点实验室，北京 100083；2. 北京科技大学土木与资源工程学院，北京 100083

收稿日期:2020-07-15 修回日期:2020-09-10 出版日期:2021-02-10 发布日期:2021-02-09
通讯作者: 孙浩，男，1992年生，博士，讲师，主要从事采矿工艺与理论、岩石力学方面的教学与研究工作。E-mail：sunhao2019@ustb.edu.cn E-mail:wang_ben_xin@163.com
作者简介:王本鑫，男，1991年生，博士研究生，主要从事节理岩体力学破裂特性、数字图像分析及数值计算方面的研究。
基金资助:
国家自然科学基金（No. 51674015）；中央高校基本科研业务费专项资金（No. FRF-TP-19-026A1）；中国博士后科学基金项目（No. 2020M670138）。

Study on fracture mechanism of specimens with 3D printed rough cross joints at different angles based on DIC

WANG Ben-xin^{1, 2}, JIN Ai-bing^{1, 2}, SUN Hao^{1, 2}, WANG Shu-liang^{1, 2}

1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2020-07-15 Revised:2020-09-10 Online:2021-02-10 Published:2021-02-09
Supported by:
This work was supported by the National Natural Science Foundation of China (51674015), the Fundamental Research Funds for the Central Universities (FRF-TP-19-026A1) and the China Postdoctoral Science Foundation Project (2020M670138).

摘要/Abstract

摘要： 粗糙交叉节理广泛存在于实际岩体中，含不同角度粗糙交叉节理试样的力学破裂演化特性研究对岩体工程具有重要的指导意义。基于Barton节理轮廓曲线，通过3D打印技术制作不同角度粗糙交叉节理模型，浇筑成试样后进行单轴压缩试验，并采用DIC技术对试样表面的变形特征进行了处理与分析。结果表明：主节理倾角较大试样的单轴强度基本小于主节理倾角较小试样，主次节理夹角在45°～60°之间时对试样的单轴抗压强度和弹性模量影响最大；通过对DIC应变云图、节理尖端全程应变和应变率激增点分析可知，起裂主要发生在主节理上下端和次节理上端，起裂应力在峰值应力的90%至峰值阶段，屈服阶段裂隙扩展速度缓慢，快速扩展主要发生在峰后阶段；粗糙交叉节理试样的起裂方向与平直节理试样不同，节理尖端裂隙多以剪切形式存在，远端在最大主应力的作用下多演化为张拉裂隙；主节理下端的应力强度因子基本大于次节理上端，说明主节理对试样的破裂起主要作用，节理尖端的KII多大于KI，说明起裂扩展受剪切作用大于张拉作用。

关键词: DIC, 3D打印, 粗糙交叉节理, 破裂演化, 应力强度因子

Abstract: Rough cross joints widely exist in actual rock mass. The laboratory study on the mechanical fracture evolution of specimens with rough cross joints at different angles can provide important guidance for rock mass engineering. Based on Barton joint profile, we use 3D printing to generate rough cross joint models with different angles. Then we carry out uniaxial compressive tests after pouring the specimens. The deformation characteristics of the surface are processed and analyzed by the digital image correlation (DIC) technology. The results show that the uniaxial strength of specimens with larger dips of primary joint is less than that of specimens with smaller dips. The influence on the uniaxial compressive strength and elastic modulus of the specimen is most significant when the angle γ between the primary and secondary joints is between 45° and 60°. We analyze the obtained strain contour figures by DIC, as well as the whole range of strain of joint tips and strain rate surge points. The observations are listed as follows. The fracture initiation mainly occurs at the upper and lower ends of primary joint and the upper end of secondary joint, and the initiation stress is between 90% of the peak stress and the peak. The fracture propagation rate is slow in the yield stage, and the rapid expansion mainly occurs in the post-peak stage. The fracture initiation direction of the rough cross joint specimen is different from that of the smooth joint specimen. The fracture at the tips of joints is mostly in the form of shear, and evolves into tensile fracture under the action of maximum principal stress. The stress intensity factor at the lower end of the primary joint is larger than that at the upper end of the secondary joint, which indicates that the primary joint plays the main role in the fracture of the specimen. KII at the joint tipis is greater than KI, which indicates that the shear effect is greater than the tensile effect on the initiation and propagation of fracture.

Key words: DIC, 3D printing, rough cross joints, fracture evolution, stress intensity factors

中图分类号:

TU 45

王本鑫, 金爱兵, 孙浩, 王树亮, . 基于DIC的含不同角度3D打印粗糙交叉节理试样破裂机制研究[J]. 岩土力学, 2021, 42(2): 439-450.

WANG Ben-xin, JIN Ai-bing, SUN Hao, WANG Shu-liang, . Study on fracture mechanism of specimens with 3D printed rough cross joints at different angles based on DIC[J]. Rock and Soil Mechanics, 2021, 42(2): 439-450.

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基于DIC的含不同角度3D打印粗糙交叉节理试样破裂机制研究

Study on fracture mechanism of specimens with 3D printed rough cross joints at different angles based on DIC

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基于DIC的含不同角度3D打印 粗糙交叉节理试样破裂机制研究

Study on fracture mechanism of specimens with 3D printed rough cross joints at different angles based on DIC

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基于DIC的含不同角度3D打印粗糙交叉节理试样破裂机制研究