首页|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

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

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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。
Effect of fractures on mechanical behavior of sand powder 3D printing rock analogue under triaxial compression
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.

sand powder 3D printingtriaxial compressionconfining pressurefracture geometrymechanical behavior

李丕茂、蒋力帅、文志杰、吴朝磊、杨一鸣、彭晓涵、武泉森、武泉林

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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

School of Engineering,Jining University,Qufu 273100,China

砂型3D打印 三轴压缩 裂隙数目 力学特性 破坏特征

Young Scientist Project of National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Shandong Province,ChinaNatural Science Foundation of Shandong Province,ChinaScience and Technology Support Plan for Youth Innovation of Colleges and Universities in Shandong Province,China

2021YFC290060052074166ZR2021YQ38ZR2020QE1212022KJ101

2024

10.1007/s11771-024-5721-5

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(8)