基于DIC的3D打印交叉节理试件破裂机制研究

doi:10.16285/j.rsm.2020.0343

岩土力学 ›› 2020, Vol. 41 ›› Issue (12): 3862-3872.doi: 10.16285/j.rsm.2020.0343

基于DIC的3D打印交叉节理试件破裂机制研究

金爱兵^{1, 2}，王树亮^{1, 2}，王本鑫^{1, 2}，孙浩^{1, 2}，陈帅军^{1, 2}，朱东风^{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:2020-03-25 修回日期:2020-04-13 出版日期:2020-12-11 发布日期:2021-01-15
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:jinaibing@ustb.edu.cn
作者简介:金爱兵，男，1974年生，博士，教授，主要从事岩石力学与工程方面的教学与研究工作。
基金资助:
国家自然科学基金（No.52004017，No.51674015）；中国博士后科学基金（No.2020M670138）；中央高校基本科研业务费专项资金资助项目（No.FRF-TP-19-026A1）

Fracture mechanism of specimens with 3D printing cross joint based on DIC technology

JIN Ai-bing^{1, 2}, WANG Shu-liang^{1, 2}, WANG Ben-xin^{1, 2}, SUN Hao^{1, 2}, CHEN Shuai-jun^{1, 2}, ZHU Dong-feng^{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:2020-03-25 Revised:2020-04-13 Online:2020-12-11 Published:2021-01-15
Supported by:
This work was supported by the National Natural Science Foundation of China(52004017,51674015), the China Postdoctoral Science Foundation (2020M670138) and the Fundamental Research Funds for the Central Universities(FRF-TP-19-026A1).

摘要/Abstract

摘要： 为研究交叉节理的存在对岩体破裂机制的影响，采用3D打印技术制备了可模拟岩体交叉结构面的节理模型，通过相似材料浇筑形成含预制交叉节理的试件，并基于数字图像相关技术（DIC）分析了单轴压缩下试件裂纹起裂、扩展及破坏模式。研究结果表明：采用3D打印技术制作的闭合节理模型，可以有效替代传统的切割、插缝等方法形成的张开型节理裂隙。基于此展开的试验结果表明，交叉节理存在会显著降低试件强度，且随着交叉角度的增大，试件强度先升高后降低，在45o和60o之间达到最大值，峰值应变与强度呈现相反的变化规律；裂纹扩展过程可分为微裂隙闭合阶段、微破裂发展阶段、主节理起裂扩展阶段和次节理迅速延伸阶段，这与应力?应变曲线各阶段一一对应。研究还发现，在交叉节理岩体中，次节理对破裂的影响主要体现在峰后阶段，结合最大畸变能理论表明，其对主节理尖端应力分布影响较小，主节理对岩体的破坏起绝对控制作用，这对岩体工程有一定的指导意义。

关键词: 3D打印, 交叉节理, 单轴压缩, 数字图像相关技术（DIC）, 裂纹扩展

Abstract: In order to study the influence of the cross joints on the fracture mechanism of rock mass, a joint model that can simulate the cross structural plane of rock mass was prepared by the 3D printing technology. By pouring similar materials, the specimen with prefabricated cross joints was formed. Based on the digital image correlation technology (DIC), the crack initiation, propagation and failure mode of specimen under uniaxial compression were analyzed. The results show that the closed joint model made by 3D printing technology can effectively replace the open joint fissures formed by traditional cutting or slotting methods. The experimental results show that the cross joints can significantly reduce the rock strength. With the increase of the cross joint angle, the strength of specimen increases firstly and then decreases. It reaches the maximum value when the cross joint angle is between 45o and 60o. The peak strain presents an opposite variation rule with that of the rock strength. The process of crack growth can be divided into four stages: the microcrack closure stage, the microcrack development stage, the initiation of main joints and the rapid extension of secondary joints, which correspond to each stage of stress-strain curve. It is also found that the influence of secondary joints on the failure of rock with cross joints is mainly reflected in the post peak stage. Combined with the maximum distortion energy theory, it has little influence on the stress distribution at the tip of the main joints, which play an absolute role in controlling the rock failure. This has a certain guidance for rock engineering.

Key words: 3D printing, cross joint, uniaxial compression, digital image correlation (DIC), crack propagation

中图分类号:

TU454

金爱兵, 王树亮, 王本鑫, 孙浩, 陈帅军, 朱东风, . 基于DIC的3D打印交叉节理试件破裂机制研究[J]. 岩土力学, 2020, 41(12): 3862-3872.

JIN Ai-bing, WANG Shu-liang, WANG Ben-xin, SUN Hao, CHEN Shuai-jun, ZHU Dong-feng, . Fracture mechanism of specimens with 3D printing cross joint based on DIC technology[J]. Rock and Soil Mechanics, 2020, 41(12): 3862-3872.

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基于DIC的3D打印交叉节理试件破裂机制研究

Fracture mechanism of specimens with 3D printing cross joint based on DIC technology

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