An experimental investigation on progressive failure mechanism of the earth-retaining structure with sloping backfill using image analysis

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Shi-Yu Xu, Muhammad Irfan Khan, K. K. Pabodha M. Kannangara, Yiu Yin Lee
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Abstract

In this study, a reduced-scale retaining wall specimen was subjected to laboratory testing to examine the strain localization phenomena behind an earth-retaining structure under passive conditions. The specimen was backfilled with two distinct soil materials—sand and fine gravels—in a medium dense state, while also retaining sloping ground surfaces with varying inclinations. The soil particle movement within the backfill was monitored and tracked through successive images captured at a consistent rate using a camera, as the wall progressively approached the backfill. By employing the digital image correlation technique, von Mises strain contours within the backfill were subsequently deduced from the recorded soil particle displacement field. This method unveiled the distribution and progression of strain concentration bands. Moreover, the laboratory tests documented the horizontal force–displacement curve of the wall, the earth pressure distribution across depth, and the wall’s uplift. These findings were verified against various analytical models and finite element simulations, illustrating good alignment. The von Mises strain maps disclosed the presence of a distinct boundary within the backfill, beyond which soil particles remained immobile during the pushover test. This boundary manifested during the early phases of the test when stress levels were relatively low. For specimens with positive slopes, this boundary evolved into the ultimate failure surface, characterized by a geometry resembling a log-spiral curve. Conversely, for specimens with negative slopes, the failure surface may not adhere to this log-spiral boundary; instead, it might follow a more direct route, resembling the straight line predicted by Rankine theory.

Abstract Image

利用图像分析法对带倾斜回填土的挡土结构的渐进破坏机制进行实验研究
在这项研究中,对一个缩小比例的挡土墙试样进行了实验室测试,以研究被动条件下挡土墙结构背后的应变局部化现象。该试样由两种不同的土壤材料(沙和细砾石)回填而成,密度适中,同时还保留了不同倾斜度的倾斜地面。当墙逐渐接近回填土时,通过使用照相机以一致的速度连续拍摄图像,对回填土中土壤颗粒的移动进行监测和跟踪。通过采用数字图像相关技术,随后从记录的土壤颗粒位移场推断出回填土内的冯-米塞斯应变轮廓。这种方法揭示了应变集中带的分布和发展。此外,实验室测试还记录了墙体的水平力-位移曲线、各深度的土压力分布以及墙体的隆起。这些结果与各种分析模型和有限元模拟进行了验证,显示出良好的一致性。冯-米塞斯应变图显示,在回填土中存在一个明显的边界,在推力试验过程中,超过该边界的土壤颗粒将保持不动。该边界出现在应力水平相对较低的试验早期阶段。对于具有正斜度的试样,该边界演变为最终破坏面,其特征是几何形状类似对数螺旋曲线。相反,对于负斜度试样,破坏面可能并不遵循对数螺旋边界,而是遵循更直接的路线,类似于兰肯理论预测的直线。
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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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