Triaxial compression behavior of 3D printed and natural sands
Triaxial compression behavior of 3D printed and natural sands
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DOI：
10.1007/s10035-021-01143-0
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发表时间：
2021-11-01
期刊：
影响因子：
2.4
通讯作者：
Martinez, Alejandro
中科院分区：
文献类型：
--
作者：
Ahmed, Sheikh Sharif;Martinez, Alejandro
不同的颗粒特性，如形状、尺寸、表面粗糙度和组成材料刚度，影响粗粒土的力学行为。系统调查这些属性的个别影响需要仔细控制其他属性，这是一个普遍的挑战，在调查与天然土壤。3D打印技术的快速发展提供了生产模拟颗粒的能力，可以独立控制颗粒的尺寸和形状。这项研究检查了3D打印沙粒样本的三轴压缩行为，并将其与天然沙粒样本进行了比较。排水和不排水的各向同性固结三轴压缩试验进行的标本组成的角和圆形的3D打印和天然砂。测试结果表明，3D打印砂表现出遵循既定流动规则的应力-粘性行为，角形3D打印砂比圆形3D打印砂动员更大的临界状态摩擦角，并且如果按比例缩放单元压力，则具有相似初始孔隙比的3D打印砂和天然砂可以遵循类似的排水和不排水应力路径。结果表明，土壤的一些基本行为可以用3D打印土壤来捕获，并且可以用临界状态土壤力学框架来捕获对其机械响应的解释。然而，响应的重要差异来自3D打印过程和打印的聚合物材料的较小刚度。人工砂类似物是通过X射线CT扫描亚圆形和亚角形天然砂3D打印而成。进行了三轴压缩试验，以表征3D打印砂的强度和粘性行为以及临界状态参数，并将其与天然砂所表现出的性能进行比较。
Different particle properties, such as shape, size, surface roughness, and constituent material stiffness, affect the mechanical behavior of coarse-grained soils. Systematic investigation of the individual effects of these properties requires careful control over other properties, which is a pervasive challenge in investigations with natural soils. The rapid advance of 3D printing technology provides the ability to produce analog particles with independent control over particle size and shape. This study examines the triaxial compression behavior of specimens of 3D printed sand particles and compares it to that of natural sand specimens. Drained and undrained isotropically-consolidated triaxial compression tests were performed on specimens composed of angular and rounded 3D printed and natural sands. The test results indicate that the 3D printed sands exhibit stress-dilatancy behavior that follows well-established flow rules, the angular 3D printed sand mobilizes greater critical state friction angle than that of rounded 3D printed sand, and analogous drained and undrained stress paths can be followed by 3D printed and natural sands with similar initial void ratios if the cell pressure is scaled. The results suggest that some of the fundamental behaviors of soils can be captured with 3D printed soils, and that the interpretation of their mechanical response can be captured with the critical state soil mechanics framework. However, important differences in response arise from the 3D printing process and the smaller stiffness of the printed polymeric material. Graphic abstract Artificial sand analogs were 3D printed from X-ray CT scans of sub-rounded and sub-angular natural sands. Triaxial compression tests were performed to characterize the strength and dilatancy behavior as well as critical staste parameters of the 3D printed sands and to compare it to that exhibited by the natural sands.