扩展性沙子的界面摩擦异构性
Muhammad Naqeeb Nawaz1, Seung-Hun Lee1, Song-Hun Chong2
1Department of Civil Engineering, Sunchon National University, 255 Jungang-ro, Sunchon-si, Jeollanam-do, 57922, Republic of Korea.
Scientific reports
|March 15, 2024
概括
这项研究揭示了以蛇皮为灵感的表面如何影响沙子.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 是一种材料科学.
- 部落学 (tribology) 是一个学科.
背景情况:
- 优化土壤结构接口的剪切阻力需要理解方向依赖的摩擦异质性.
- 之前的研究使用收缩性沙子量化了这种异构性,在理解延伸性沙子的行为方面留下了一个空白.
研究的目的:
- 为了研究扩展性沙子对蛇皮灵感表面的界面剪切反应.
- 分析表面几何和剪切方向对摩擦和膨胀的影响.
主要方法:
- 接口直接剪切测试是在法国标准的沙子和蛇皮灵感表面上进行的.
- 测试是在不同的垂直应力 (50, 100, 200 kPa) 和两个剪切方向 (头骨-尾巴和尾巴-头骨) 下进行的.
主要成果:
- 沙子-沙子测试显示显著扩张和峰值-残余摩擦角度差异为8°,相对密度为40%.
- 剪切与 (头骨) 相比,剪切与 (尾骨) 相比,产生了更高的剪切阻力和扩张.
- 较高的尺度高度/较短的尺度长度增加了扩展和摩擦角度;在头骨剪切中,异性异性更为明显.
- 接口摩擦和膨胀角度随着尺度几何比率 (L/H) 的增加而减少.
结论:
- 灵感来自蛇皮的表面显著影响沙子的剪切行为,诱导取决于方向的摩擦异质性.
- 表面几何 (尺度的高度和长度) 对于调节摩擦和膨胀至关重要.
- 这些发现为在地质技术应用中设计具有优化剪切阻力的接口提供了洞察力.
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