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Modeling the mechanical behavior of coarse-grained soil using additive manufactured particle analogs
Acta Geotechnica ( IF 5.6 ) Pub Date : 2020-06-28 , DOI: 10.1007/s11440-020-01007-6
Sheikh Sharif Ahmed , Alejandro Martinez

Systematic investigation of the effects of individual particle properties, such as shape, size, surface roughness, and constituent materials stiffness, on the behavior of coarse-grained soils requires careful control over the other particle properties. Achieving this control is a pervasive challenge in investigations with naturally occurring soils. The rapid advance of modern additive manufacturing (AM) technology provides the ability to create analog particles with independent control over particle size and shape. This work evaluates the feasibility of the stereolithography (SLA) and polyjet technologies to generate analog particles that can model the mechanical behavior of coarse-grained soils. AM is used to generate equal-sized spheres and analog sand particles from 3D X-ray CT scans of natural rounded and angular sand particles. The uniaxial inter-particle compression, oedometer compression, and shear wave transmission behaviors of the AM particles are investigated and compared to those of glass and steel spheres and natural rounded and angular sand particles. The results indicate that AM can successfully reproduce the shape of natural coarse sand particles. The deformation of micro-asperities was found to influence the contact response of the polyjet AM particles, thus affecting their inter-particle uniaxial compression and oedometer compression response. The contact response of the SLA AM particles was closer to that of glass spheres. Both AM particle types exhibit a dependency of shear wave velocity and shear modulus on mean effective stress that is consistent with that of natural sands.

中文翻译:

使用加成制造的颗粒类似物对粗粒土的力学行为进行建模

对单个颗粒性质(例如形状,大小,表面粗糙度和组成材料的刚度)对粗粒土壤行为的影响进行系统研究需要仔细控制其他颗粒性质。在自然土壤调查中,实现这种控制是一项普遍的挑战。现代增材制造(AM)技术的飞速发展提供了创建具有独立控制粒子尺寸和形状的模拟粒子的能力。这项工作评估了立体平版印刷术(SLA)和polyjet技术产生可模拟粗糙颗粒土壤力学行为的模拟颗粒的可行性。AM用于根据自然圆形和角形沙粒的3D X射线CT扫描生成等大小的球体和模拟沙粒。研究了AM粒子的单轴粒子间压缩,里程表压缩和剪切波传输行为,并将其与玻璃和钢球以及自然的圆形和有角沙粒进行比较。结果表明AM可以成功地再现天然粗砂颗粒的形状。发现微细颗粒的变形影响polyjet AM颗粒的接触响应,从而影响它们的颗粒间单轴压缩和里程表压缩响应。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。研究了AM颗粒的横波和切变波传播行为,并将其与玻璃和钢球以及自然的圆形和角形沙粒进行了比较。结果表明AM可以成功地再现天然粗砂颗粒的形状。发现微细颗粒的变形影响polyjet AM颗粒的接触响应,从而影响它们的颗粒间单轴压缩和里程表压缩响应。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。研究了AM颗粒的横波和切变波传播行为,并将其与玻璃和钢球以及自然的圆形和角形沙粒进行了比较。结果表明AM可以成功地再现天然粗砂颗粒的形状。发现微细颗粒的变形影响polyjet AM颗粒的接触响应,从而影响它们的颗粒间单轴压缩和里程表压缩响应。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。结果表明AM可以成功地再现天然粗砂颗粒的形状。发现微细颗粒的变形影响polyjet AM颗粒的接触响应,从而影响它们的颗粒间单轴压缩和里程表压缩响应。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。结果表明AM可以成功地再现天然粗砂颗粒的形状。发现微细颗粒的变形影响polyjet AM颗粒的接触响应,从而影响它们的颗粒间单轴压缩和里程表压缩响应。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂岩的平均有效应力一致。SLA AM颗粒的接触响应更接近玻璃球。两种AM颗粒类型均表现出剪切波速度和剪切模量与平均有效应力的相关性,该平均有效应力与天然砂的相一致。
更新日期:2020-06-28
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