Evolution of axial cumulative strain and micro-pore structure characteristics of solidified mud under cyclic loading

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-01-01 DOI:10.1016/j.trgeo.2024.101454

Liangjie Xu , Rongjun Zhang , Junjie Zheng , Honglei Sun , Yingchao Gao

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引用次数: 0

Abstract

Embankments and foundation geotechnical structures are frequently subjected to long-term cyclic loading due to traffic during their service life. Excessive cumulative deformation can lead to pavement cracking and uneven settlement of the subgrade. This study conducts a series of dynamic triaxial tests to analyze the effects of the number of cycles (N), effective confining pressure (σ_c), and dynamic stress amplitude (σ_d) on the axial cumulative strain (ε_d) characteristics of solidified mud samples. Additionally, it investigates the evolution model of ε_d of solidified mud and establishes a predictive model for this strain. In conjunction with the NMR tests, this research further investigates the effects of σ_c and σ_d on the pore distribution of solidified mud after loading. Ultimately, the correlation between microscopic pore structure indicators and ε_d is elucidated. The results indicate that the ε_d behavior of solidified mud under cyclic loading exhibits characteristics of plastic shakedown. Furthermore, the exponential hyperbolic function model more accurately characterizes the relationship between ε_d of the samples and N. Before and after cyclic loading, the micropores of the samples accounted for over 95 % of the total pore volume, predominantly concentrated in the radius range of r < 0.3 μm. A correlation exists between the average pore size of the sample and ε_d, which is primarily influenced by σ_d and σ_c.

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.