Hong Zijie, Chen Shun, Liu Xufeng, Li Fengqiong
School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China.
Sci Rep. 2024 Oct 25;14(1):25367. doi: 10.1038/s41598-024-77055-9.
Layered rocks are prevalent in the Earth's crust and are frequently encountered in underground engineering construction. Due to their pronounced anisotropy, the deformation and failure mechanism of layered rock are complex. Laboratory tests are an effective way to study these mechanisms. However, natural layered rocks present challenges, such as difficult sampling and large discreteness. Additionally, current methods for creating layered rock models are often costly or lack precision, limiting research into their mechanical properties. In this study, a 3D printing process using wet material extrusion was adopted, with a wide range of material options and low production costs. Five layered model samples with bedding dip angles of 0°, 30°, 45°, 60° and 90° were printed using this method. Uniaxial compression tests were conducted, supplemented by digital image correlation (DIC) to capture detailed stress-strain data and failure patterns. The results demonstrate that the mechanical properties of the 3D-printed samples closely resemble those of natural layered rocks and exhibit significant anisotropy. This approach presents a new cost-effective method for studying the mechanical behavior of layered rock.
层状岩石在地壳中普遍存在，在地下工程建设中也经常遇到。由于其明显的各向异性，层状岩石的变形和破坏机制较为复杂。实验室试验是研究这些机制的有效方法。然而，天然层状岩石存在一些挑战，如采样困难和离散性大。此外，目前创建层状岩石模型的方法通常成本高昂或缺乏精度，限制了对其力学性能的研究。在本研究中，采用了使用湿材料挤出的3D打印工艺，该工艺具有广泛的材料选择且生产成本低。使用该方法打印了五个层面倾角分别为0°、30°、45°、60°和90°的层状模型样品。进行了单轴压缩试验，并辅以数字图像相关（DIC）技术以获取详细的应力应变数据和破坏模式。结果表明，3D打印样品的力学性能与天然层状岩石的力学性能非常相似，并表现出显著的各向异性。这种方法为研究层状岩石的力学行为提供了一种新的经济有效的方法。
