3D printing is widely adopted to quickly produce rock mass models with complex structures in batches, improving the consistency and repeatability of physical modeling. It is necessary to regulate the mechanical properties of 3D-printed specimens to make them proportionally similar to natural rocks. This study investigates mechanical properties of 3D-printed rock analogues prepared by furan resin-bonded silica sand particles. The mechanical property regulation of 3D-printed specimens is realized through quantifying its similarity to sandstone, so that analogous deformation characteristics and failure mode are acquired. Considering similarity conversion, uniaxial compressive strength, cohesion and stress–strain relationship curve of 3D-printed specimen are similar to those of sandstone. In the study ranges, the strength of 3D-printed specimen is positively correlated with the additive content, negatively correlated with the sand particle size, and first increases then decreases with the increase of curing temperature. The regulation scheme with optimal similarity quantification index, that is the sand type of 70/140, additive content of 2.5‰ and curing temperature of 81.6 ℃, is determined for preparing 3D-printed sandstone analogues and models. The effectiveness of mechanical property regulation is proved through uniaxial compression contrast tests. This study provides a reference for preparing rock-like specimens and engineering models using 3D printing technology.

中文翻译：

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基于3D打印和相似量化的类岩石试件力学性能调控研究


广泛采用3D打印技术批量快速制作结构复杂的岩体模型，提高物理建模的一致性和重复性。有必要调节 3D 打印标本的机械性能，使其与天然岩石成比例相似。本研究研究了由呋喃树脂粘合硅砂颗粒制备的 3D 打印岩石类似物的机械性能。通过量化3D打印试件与砂岩的相似性，实现其力学性能调控，从而获得相似的变形特征和破坏模式。考虑到相似转换，3D打印试件的单轴抗压强度、粘聚力和应力应变关系曲线与砂岩相似。在研究范围内，3D打印试件的强度与添加剂含量呈正相关，与砂粒粒径呈负相关，且随着固化温度的升高先增大后减小。确定了制备3D打印砂岩模拟物和模型的最佳相似量化指标的调节方案，即砂型为70/140、添加剂含量为2.5‰、固化温度为81.6℃。通过单轴压缩对比试验证明了力学性能调控的有效性。该研究为利用3D打印技术制备类岩石标本和工程模型提供参考。