卸荷速率对裂隙黏土单调与循环特性影响的试验研究

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
Zhiao Gao , Lingwei Kong , Xinming Li , Shuangjiao Wang , Jiacheng Deng
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引用次数: 0

摘要

裂隙土运输工程开挖施工周期的变化导致卸荷速率的不同,从而影响土体的力学特性。本研究利用三轴试验系统对原状裂隙试样和三种不同卸载速率的重塑试样进行单调和循环加载不排水剪切试验。将K0固结样视为试验过程中未卸荷的土体。结果表明,初始卸载速率对原状和重塑试件的再加载剪切力学性能均有影响。卸载速率的影响在未扰动和重塑的土壤之间是不同的,这种差异归因于固有的裂缝。具体来说,原状土在低卸载速率下由于裂缝表现出明显的损伤,而重塑土在卸载速率降低时由于压实而强度增强。同样,卸载也会造成强度的损失。结构差异导致原状试件的单调加载强度高于重塑试件。相反,重塑试样在循环荷载下表现出更高的动强度,可能是因为裂缝变形,降低了整体动强度。随后的微观分析,利用SEM图像,以及宏观固有裂缝的讨论,阐明了卸载速率对土壤损伤机制的影响,促进了对卸载后裂隙土行为的理解。研究不同卸荷速率下裂隙土的力学特性,对于理解裂隙土的损伤机理和确定卸荷后土体强度参数具有重要意义,为土体工程的实际应用提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on the effect of unloading rate on monotonic and cyclic behavior of fissured clay
Variations in excavation construction periods for fissured soil transportation engineering lead to differing unloading rates, which affect the soil’s mechanical properties. This study utilizes a triaxial testing system to conduct monotonic and cyclic loading undrained shear tests on undisturbed fissured samples as well as remolded samples subjected to three distinct unloading rates. The K0 consolidated samples are regarded as soil mass that undergoes no unloading during testing. The findings indicated that the initial unloading rate influences the reloading shear mechanical properties of undisturbed and remolded specimens. The effects of unloading rates differ between undisturbed and remolded soil, a discrepancy attributed to inherent fissures. Specifically, undisturbed soil exhibits significant damage at low unloading rates due to fissures, while remolded soil experiences strength augmentation due to compaction with decreased unloading rates. Similarly, unloading will cause a loss of strength. Structural disparities result in the monotonic loading strength of undisturbed specimens being higher than that of remolded ones. In contrast, remolded specimens demonstrate greater dynamic strength under cyclic loading, likely because fissures deform, diminishing overall dynamic strength. Subsequent microscopic analysis, utilizing SEM images, along with a discussion of macroscopic inherent fissures, elucidated the impact of unloading rate on soil damage mechanisms, advancing the understanding of fissured soil behavior post-unloading. The study of mechanical properties of fissured soil following varying unloading rates is crucial for comprehending its damage mechanism and determining post-unloading soil strength parameters, providing valuable insights for practical applications in soil engineering.
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来源期刊
Transportation Geotechnics
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.
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