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材料导报  2022, Vol. 36 Issue (17): 20090297-6    https://doi.org/10.11896/cldb.20090297
  无机非金属及其复合材料 |
光固化3D打印在复杂裂隙岩体研究中的探索
张科1,2,*, 叶锦明1, 刘享华2
1 昆明理工大学电力工程学院,昆明 650500
2 昆明理工大学建筑工程学院,昆明 650500
Exploration of Stereolithography Apparatus 3D Printing Technology in the Research of Complex Fractured Rock Mass
ZHANG Ke1,2,*, YE Jinming1, LIU Xianghua2
1 Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
2 Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming 650500, China
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摘要 由于岩体结构的复杂性,如何重构含裂隙网络的物理模型试件是岩石力学试验研究面临的难题之一。本工作提出了一种基于光固化3D打印技术的裂隙网络类岩石试件制备方法。结合数字图像相关方法对裂隙网络类岩石试件加载过程进行非接触式全场变形测量,并引入应变场方差这一指标,定量研究了裂隙岩体变形破坏演化规律及前兆异常特征。试验结果表明:采用光固化3D打印技术可实现裂隙岩体的复杂物理模型重构。裂隙网络类岩石试件的变形破坏过程类似于真实裂隙岩体,可划分为压密、弹性变形、裂纹扩展以及峰后阶段,其应力-应变曲线出现峰后多台阶式跌落特征。综合强度参数、峰后力学特征和试验过程中块体弹射现象来看,制备的3D打印试件可用于模拟裂隙硬岩。采用数字图像相关方法可实现裂隙岩体变形场的动态捕捉,其变形破坏过程表现出明显的应变局部化特征。加载过程中应变场方差的演化过程可划分为初始分异、稳定分异、加速分异以及加加速分异阶段。应变场方差在新生裂纹萌生后呈现出持续增长的趋势,而在进入不稳定裂纹扩展阶段后呈现为陡增趋势,可视为两个前兆点。研究成果可为复杂裂隙岩体的物理重构以及失稳预警提供新的思路。
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张科
叶锦明
刘享华
关键词:  3D打印  光固化  裂隙岩体  裂隙网络  数字图像相关方法  力学特性  变形场    
Abstract: Due to the complexity of rock mass structure, the reconstruction of physical model specimen containing fracture network is one of the key problems in the experimental study of rock mechanics. A method for preparing rock-like specimen containing fracture network based on the stereolithography 3D printing was proposed. The digital image correlation method was used to non-contactly measure the full-field deformation of rock-like specimen containing fracture network during the loading process. The failure evolution law and the precursory anomaly characteristics of fractured rock were quantitatively studied by using the variance of strain field. The results show that the complex physical model of fractured rock can be reconstructed by using the stereolithography 3D printing. The deformation and failure process of rock-like specimen containing fracture network has similar features with natural rocks, which can be divided into four stages including closure, elastic deformation, crack propagation and post-peak stage. The stress-strain curve shows multi-step drops after the stress peak. According to the strength parameters, post-peak mechanical properties and block ejections during the experimental process, the specimen prepared by the stereolithography 3D printing is suitable for simulating fractured hard rock. Strain fields of fractured rock can be dynamically captured by using the digital image correlation method. Strain localization is observed during the deformation and failure process. The variance of strain field in the loading process can be divided into four stages including initial differentiation, stable differentiation, acceleration differentiation and accelerated acceleration differentiation. The variance of strain field presents a trend of stable increase after new crack initiation. Then it presents a sharp increase trend while the specimen is at the unstable crack propagation stage. These can be regarded as two precursor points. The results can provide a new perspective for physical reconstruction and instability early-warning of complex fractured rock masses.
Key words:  3D printing    stereolithography    fractured rock mass    fracture network    digital image correlation method    mechanical characteristic    deformation field
出版日期:  2022-09-10      发布日期:  2022-09-10
ZTFLH:  TU452  
基金资助: 国家自然科学基金(11902128);云南省应用基础研究计划(2018FB093;2019FI012)
通讯作者:  *zhangke_csu@163.com   
作者简介:  张科,昆明理工大学教授、博士研究生导师。2009年6月、2015年6月分别于中南大学获得工学学士学位和博士学位。以第一/通讯作者在国内外学术期刊上发表SCI/EI论文40余篇。研究工作主要围绕脆性材料断裂力学以及无损检测传感与成像,主持包括国家自然科学基金、中国博士后科学基金特别资助等国家级、省部级项目8项。
引用本文:    
张科, 叶锦明, 刘享华. 光固化3D打印在复杂裂隙岩体研究中的探索[J]. 材料导报, 2022, 36(17): 20090297-6.
ZHANG Ke, YE Jinming, LIU Xianghua. Exploration of Stereolithography Apparatus 3D Printing Technology in the Research of Complex Fractured Rock Mass. Materials Reports, 2022, 36(17): 20090297-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20090297  或          http://www.mater-rep.com/CN/Y2022/V36/I17/20090297
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