A numerical study on the multi-cycle self-burrowing of a dual-anchor probe in shallow coarse-grained soils of varying density
A numerical study on the multi-cycle self-burrowing of a dual-anchor probe in shallow coarse-grained soils of varying density
复制标题
双锚探针在浅层不同密度粗粒土中多周期自掘进数值研究
DOI：
10.1007/s11440-023-02088-9
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发表时间：
2023
期刊：
影响因子：
5.7
通讯作者：
Martinez, Alejandro
中科院分区：
文献类型：
--
作者：
Chen, Yuyan;Zhang, Ningning;Fuentes, Raul;Martinez, Alejandro
开发能够在没有来自钻机和卡车的外部反作用力的帮助下穿透土壤的自钻式探针将有助于现场表征活动和在现有结构下方以及在访问受限的位置（例如，水坝的脚趾，外星人的身体）。由于几何约束和土壤强度随深度的增加，在现场成功部署自钻式探头将需要几个膨胀、穿透和收缩运动的循环。本研究探讨了多周期性能的双锚自钻探针在不同密度的颗粒组件使用离散元建模模拟。模拟探头由可扩展顶部轴、可扩展底部轴和锥形尖端组成。采用力控制杆的扩张，位移控制杆的收缩和杆尖的前移，并采用杆尖的水平摆动来减小侵彻阻力。自钻式探头的自钻距离方面的性能是在中等密度的标本比在密集和松散的标本，由于锚固力的高幅度相比，穿透阻力。对于所有三种土壤密度，大部分的机械功都是由尖端振荡完成的;然而，在密度较大的样本中，这占总功的百分比更大。此外，虽然尖端振荡有助于实现更大深度的自挖掘，但它也产生更大的工作需求。这里提出的结果可以帮助评估土壤密度对探针原型的影响，并估计自掘所需的工作。
Development of self-burrowing probes that can penetrate soils without the aid of external reaction force from drill rigs and trucks would facilitate site characterization activities and deployment of sensors underneath existing structures and in locations with limited access (e.g., toe of dams, extraterrestrial bodies). Successful deployment of self-burrowing probes in the field will require several cycles of expansion, penetration, and contraction motions due to the geometric constraints and the increase in soil strength with depth. This study explores the multi-cycle performance of a dual-anchor self-burrowing probe in granular assemblies of varying density using discrete element modeling simulations. The simulated probe consists of an expandable top shaft, expandable bottom shaft, and a conical tip. The expansion of the shafts are force-controlled, the shaft contraction and tip advancement are displacement-controlled, and the horizontal tip oscillation is employed to reduce the penetration resistance. The performance of the self-burrowing probe in terms of self-burrowing distance is greater in the medium dense specimen than in the dense and loose specimens due to the high magnitude of anchorage force in comparison with penetration resistance. For all three soil densities, most of the mechanical work is done by tip oscillation; however, this accounts for a greater percentage of the total work in the denser specimen. Additionally, while tip oscillation aids in enabling self-burrowing to greater depths, it also produces a greater work demand. The results presented here can help evaluate the effects of soil density on probe prototypes and estimate the work requited for self-burrowing.
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影响因子：
5.7
作者：
Chen, Yuyan;Martinez, Alejandro;DeJong, Jason
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DOI：
--
发表时间：
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