Pullout resistance of biomimetic root-inspired foundation systems
Pullout resistance of biomimetic root-inspired foundation systems
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DOI：
10.1007/s11440-023-02118-6
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发表时间：
2023-11
期刊：
影响因子：
5.7
通讯作者：
Thibaut Houette;Meron Dibia;Nariman Mahabadi;Hunter King
中科院分区：
文献类型：
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作者：
Thibaut Houette;Meron Dibia;Nariman Mahabadi;Hunter King
深基础和锚固系统通常由简单的线性单元组成，受设计、材料和建造它们所采用的技术的限制。其稳定性是通过将结构荷载转移到更深、更稳定的更大面积的土层中来实现的，减少了过度沉降的可能性，并提供了对外部因素(包括风和地震)的侧向力的抵抗。相比之下，根系通过半弹性单元的分支形态将载荷分配给大量的土壤。根还渗透到土壤介质中，减少侵蚀，创造栖息地，交换、储存和运输资源，同时不断感知和适应环境条件。他们的多功能集成的见解可以通过仿生学转移到土木工程中。作为设计根激励基础的第一步，通过竖向拔出试验评估了各种形态特征(侧支长度、节点数、侧支数量、分支角和侧支横截面)对基础性能的影响。在模型特性之外，观察到了总体趋势，包括模型表面积与所达到的最大力之间的正相关。然而，由于模型和颗粒介质之间的复杂相互作用，没有模型性质完全解释所有模型的拔出阻力的差异。分别分析了各个根部性状对抗拔阻力的影响，以适应根性基础的设计和探索颗粒物理原理。还提出了令人惊讶和违反直觉的结果的潜在原因。进一步的研究可以通过研究确定的违反直觉的情景来评估作为对这些结果的潜在解释的假设。
Deep foundation and anchorage systems are often comprised of simple linear elements, limited by design, materials and techniques employed to build them. Their stability is attained by transferring structural loads to deeper, more stable soil layers across a larger area, reducing potential for excessive settlement and providing resistance against lateral forces from external factors including wind and earthquakes. In comparison, root systems distribute loads to a large volume of soil through a branched morphology of semiflexible elements. Roots also penetrate soil media, reduce erosion, create habitats, and exchange, store and transport resources, while continuously sensing and adapting to environmental conditions. Insights from their integration of multifunctionality can be transferred to civil engineering through biomimicry. As a first step toward designing root-inspired foundations, the effects of various morphological traits (laterals’ length, number of nodes, number of laterals, branching angle and laterals’ cross section) on foundation performance are evaluated through vertical pullout tests. Out of the model properties, general trends were observed, including the positive correlation between models’ surface area and maximum force reached. Yet, due to complex interactions between the model and granular media, no model property fully explained differences in pullout resistance of all models. The effects of each root trait on pullout resistance were analyzed separately, which can serve to adapt the design of root-inspired foundations and exploit granular physics principles. Potential reasons for surprising and counterintuitive results are also presented. Further studies could evaluate the assumptions given as potential explanations of these results by studying identified counterintuitive scenarios.