三轴压缩下裂隙对砂型3D打印类岩石试样力学特性的影响
Effect of fractures on mechanical behavior of sand powder 3D printing rock analogue under triaxial compression
李丕茂 1蒋力帅 1文志杰 2吴朝磊 1杨一鸣 1彭晓涵 1武泉森 3武泉林3
作者信息
- 1. State Key Laboratory of Mining Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266590,China
- 2. State Key Laboratory of Mining Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266590,China;Mining College,Guizhou University,Guiyang 550025,China
- 3. School of Engineering,Jining University,Qufu 273100,China
- 折叠
摘要
实际工程中岩体多处于三向受力状态,因此岩体内部节理裂隙等缺陷对岩体力学行为(包括围岩的破坏失稳和工程稳定性)有严重的影响.本文基于砂型3D打印技术,以常规三轴压缩试验为手段,研究了围压和裂隙几何形态对砂型3D打印试样强度及变形破坏特征的影响.结果表明,试样峰值强度、轴向峰值应变以及弹性模量受裂隙数目的影响性最大;围压是试样破坏模式的重要影响因素,受其影响,试样更容易发生剪切破坏,但不同裂隙试样次生裂纹的萌生、扩展、贯通过程不同.单裂隙试样萌生两条次生倾斜裂纹,双裂隙试样萌生一条次生共面裂纹和一条次生倾斜裂纹,多裂隙试样主要受预制裂隙分布形态的影响,发生块体式破坏.实验揭示了砂型3D打印试样与煤、砂岩等软岩在三轴压缩下弹塑性力学特性及变形破坏特征的相似性,验证了砂型3D打印试样作为类软岩材料用于三轴压缩试验研究的可行性,为采用砂型3D打印技术开展复杂裂隙岩体三轴压缩试验研究提供了基础,对进一步揭示三轴荷载下裂隙围岩力学特性具有一定参考价值.
Abstract
In practical engineering applications,rock mass are often found to be subjected to a triaxial stress state.Concurrently,defects like joints and fractures have a notable impact on the mechanical behavior of rock mass.Such defects are identified as crucial contributors to the failure and instability of the surrounding rock,subsequently impacting the engineering stability.The study aimed to investigate the impact of fracture geometry and confining pressure on the deformation,failure characteristics,and strength of specimens using sand powder 3D printing technology and conventional triaxial compression tests.The results indicate that the number of fractures present considerably influences the peak strength,axial peak strain and elastic modulus of the specimens.Confining pressure is an important factor affecting the failure pattern of the specimen,under which the specimen is more prone to shear failure,but the initiation,expansion and penetration processes of secondary cracks in different fracture specimens are different.This study confirmed the feasibility of using sand powder 3D printing specimens as soft rock analogs for triaxial compression research.The insights from this research are deemed essential for a deeper understanding of the mechanical behavior of fractured surrounding rocks when under triaxial stress state.
关键词
砂型3D打印/三轴压缩/裂隙数目/力学特性/破坏特征Key words
sand powder 3D printing/triaxial compression/confining pressure/fracture geometry/mechanical behavior引用本文复制引用
基金项目
Young Scientist Project of National Key Research and Development Program of China(2021YFC2900600)
National Natural Science Foundation of China(52074166)
Natural Science Foundation of Shandong Province,China(ZR2021YQ38)
Natural Science Foundation of Shandong Province,China(ZR2020QE121)
Science and Technology Support Plan for Youth Innovation of Colleges and Universities in Shandong Province,China(2022KJ101)
出版年
2024
NETL
NSTL
万方数据