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A study on particle breakage behavior during pile penetration process using acoustic emission source location
Geoscience Frontiers ( IF 8.9 ) Pub Date : 2019-04-18 , DOI: 10.1016/j.gsf.2019.04.006
Wuwei Mao , Shogo Aoyama , Ikuo Towhata

Particle breakage is a common occurrence in granular systems when the external stress exceeds the individual particle strength. A large number of experimental evidences suggested that particle breakage may significantly influence the soil behavior. In the case of pile foundations, the subsoil below the pile tip experiences considerable high stress and consequently prone to break. Due to the lack of sufficient understanding on particle breakage mechanism, there is currently no consentaneous theoretical background for particle breakage analysis during the pile penetration process. This study aims to clarify the location of particle breakage and its evolving characteristics with the aid of acoustic emission (AE) source location method. The spatial distribution of AE hypocenters is interpreted to be associated with the mechanism of particle breakage. Results showed that the AE sources were not uniformly distributed, but concentrated within certain zones below the pile tip. This AE concentration zone was pushed downward with the advancing pile tip, and its distance from the real time pile tip position decreased after certain depth of pile penetration. The location of particle breakage interpreted from AE source location was verified with posttest excavations and the insights on the particle breakage evolution zone were further discussed.



中文翻译:

利用声发射源定位研究桩穿透过程中的颗粒破碎行为

当外部应力超过单个颗粒强度时,颗粒破裂是颗粒系统中的常见现象。大量实验证据表明,颗粒破碎可能会严重影响土壤的行为。在桩基的情况下,桩尖下方的底土承受相当大的高应力,因此容易破裂。由于对颗粒破裂机理缺乏足够的了解,目前在桩穿透过程中尚无共识的颗粒破裂分析理论背景。本研究旨在借助声发射(AE)源定位方法来弄清颗粒破裂的位置及其演变特征。AE震源的空间分布被认为与粒子破裂的机制有关。结果表明,声发射源不是均匀分布,而是集中在桩端下方的某些区域内。该AE集中区随着前进的桩尖被向下推动,并且其与实时桩尖位置的距离在一定的桩穿透深度之后减小。通过事后发掘验证了从AE源位置解释的颗粒破裂位置,并进一步讨论了关于颗粒破裂演化区的见解。

更新日期:2019-04-18
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