通过全仪器活门试验研究致密砂土拱起演变过程

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yu-Xin Gao, Hong-Hu Zhu, Jing-Wen Su, Xu-Hui Guo, Tian-Xiang Liu, Hannah Wan-Huan Zhou
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引用次数: 0

摘要

全面分析土拱的演变动力学对于准确预测沉井上方的土壤变形和评估地下结构的稳定性至关重要。在本研究中,进行了一系列活门试验,以研究致密砂土拱起的渐进发展过程。利用颗粒图像测速仪(PIV)技术捕捉土壤变形模式,同时使用光纤应变传感电缆通过测量地基应变剖面来验证土壤的位移影响区。通过测量土压力单元得出的地基反力曲线揭示了应力重新分布和主应力旋转的演变过程。试验结果表明,土拱的形成改变了活门的上覆压力,将屈服土的荷载转移到相邻的静止土上。土壤破坏面的形成与活门上的垂直应力变化相对应。应变曲线在活门上方显示出一个特征性的低谷,在活门边缘则显示出双峰。采用锚杆间距较小的微型锚杆应变传感电缆进行测量,可提供更精确的土壤剪切变形分布。此外,还可根据主应力旋转推断出土壤拱起的方向和幅度。本研究获得的见解对了解土壤拱起的传播非常有价值,为执行合理的岩土工程设计和减轻相关地质灾害提供了潜在的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigating soil arching evolution in dense sand via fully-instrumented trapdoor tests

Investigating soil arching evolution in dense sand via fully-instrumented trapdoor tests

A comprehensive analysis of the evolutionary dynamics of soil arches is crucial for accurately predicting soil deformations above sinkholes and assessing stability of underground structures. In this study, a series of trapdoor tests were conducted to investigate the progressive development of soil arching in dense sand. The particle image velocimetry (PIV) technique was utilized to capture soil deformation patterns, while fiber optic strain sensing cables were used to validate the displacement influence zone of soil by measuring strain profiles of the foundation. The ground reaction curves, derived from the measurements of earth pressure cells, shed light on the evolution process of stress redistribution and the rotation of principal stresses. The test results reveal that the formation of soil arching alters the overlying pressure on the trapdoor, transferring loads from yielding soil to adjacent stationary soil. The development of soil failure surfaces corresponded with vertical stress variations on the trapdoor. The strain profiles exhibited a characteristic trough above the trapdoor, along with double peaks at its edges. The measurements of micro-anchored strain sensing cables with small anchor spacings provided more accurate distributions of soil shear deformation. Furthermore, the orientation and magnitude of soil arching was inferred from principal stress rotations. The insights gained in this study are valuable for understanding the propagation of soil arching, offering potential implications for the execution of rational geotechnical design and the mitigation of related geological hazards.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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