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首页> 外文期刊>Granular matter >2D DEM analysis of the interactions between bio-inspired geo-probe and soil during inflation-deflation cycles
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2D DEM analysis of the interactions between bio-inspired geo-probe and soil during inflation-deflation cycles

机译：充气-放气周期中受生物启发的地球探针与土壤之间相互作用的二维DEM分析

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The cone penetration test and the standard penetration test are perhaps the most versatile techniques for investigating soil properties in-situ. Advancing the probe through the soil requires substantial downforce due to friction between the probe and the soil. Inspired by the ability of worms to conform their body to the most mechanically advantageous shape while tunneling, an innovative self-excavating geo-probe has been developed and deployed in a laboratory environment. Analogous to a worm's ability to expand its body, a soft balloon mounted behind a rigid cone is inflated or deflated by applying pressure or vacuum periodically to alter the cone penetration resistance. Laboratory experiments have shown promising results that the new geo-probe can penetrate the soil more efficiently. However, the interactions at balloon-soil-cone interfaces are complex and not fully understood. This numerical study focuses on the behavior of the geo-probe during balloon inflation and deflation. A two-dimensional discrete element model is developed to provide particle-level insight into the micromechanics of the interactions between the geo-probe and the soil. A baseline simulation is first conducted to study the failure mechanisms of the bulk soil during inflation and deflation. Additionally, the contact forces at balloon-soil and soil-cone interfaces are analyzed to show the variation of penetration resistance. The displacement field, shear strain field, and contact force chains are numerically investigated to gain a fundamental understanding of the tool-soil interaction. Then, the effect of balloon locations and overburden stresses on the behavior of the probe are studied by performing sensitivity analyses. This study provides a numerical technique to study the tool-soil interactions that was inaccessible in laboratory test. Implementation of the simulation results enables extrapolation of bench-scale testing to a wider range of stresses and boundary conditions.
机译：圆锥体渗透试验和标准渗透试验也许是用于现场调查土壤特性的最通用的技术。由于探头与土壤之间的摩擦，使探头穿过土壤前进需要很大的下压力。受蠕虫在掘进隧道时使其身体适应机械上最有利的形状的能力启发，已开发出一种创新的自动挖掘地质探针，并将其部署在实验室环境中。类似于蠕虫扩张其身体的能力，通过定期施加压力或真空以改变圆锥体的穿透阻力，可以将安装在刚性圆锥体后面的软气球充气或放气。实验室实验显示出令人鼓舞的结果，即新的地球探针可以更有效地穿透土壤。然而，在气球-土壤-锥体界面处的相互作用是复杂的，还没有被完全理解。这项数值研究的重点是在球囊充气和放气过程中地质探针的行为。开发了二维离散元素模型，以提供有关地球探针与土壤之间相互作用的微力学的粒子级见解。首先进行基线模拟，以研究散装土壤在充气和放气期间的破坏机理。此外，还分析了气球-土壤和土壤-锥形界面的接触力，以显示渗透阻力的变化。对位移场，剪切应变场和接触力链进行了数值研究，以获得对工具-土壤相互作用的基本了解。然后，通过进行敏感性分析研究球囊位置和上覆应力对探头性能的影响。这项研究提供了一种数值技术来研究在实验室测试中无法达到的工具-土壤相互作用。仿真结果的实现使得可以将实验室规模的测试外推到更大范围的应力和边界条件。

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