土工格室对加固砂基层力学特性的约束效应

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

土工格室具有限制土体变形、增强加筋土强度的约束作用,在交通路基工程中具有广泛的应用前景。为了研究土工格室对加筋砂土路基力学特性的约束作用,本文利用三轴试验分析了加筋砂土路基的宏观力学特性,并采用基于离散元法(DEM)的模拟研究了微观加筋机理。研究了潜在的宏微观联系。实验结果表明,土工格室加固样本的体积应变随材料弹性模量的增加而增加,表现出剪切收缩现象。加固样本的变形模式呈现出 "分段变形",这与未加固砂样本的变形模式不同。土工格室增强了砂样的内聚力截距,同时对摩擦角的影响很小。通过对数值模拟结果的分析发现,土工格室限制了土体颗粒的位移,改变了样品剪切带的发展趋势,导致了 "分段变形"。土工格室促进了力链的集中,增强了力链的稳定性,从而提高了宏观强度。此外,还观察到土工格室的约束效应大大降低了颗粒土的结构和力各向异性,促进了力链的垂直排列一致性。这反过来又增强了样本的垂直力传递能力,解释了土工格室的约束效应提高样本峰值剪切强度的微观机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Confinement effect of geocell on the mechanical characteristics of reinforced sand subgrade

Geocell has a confinement effect, limiting the deformation of soil and enhancing the strength of reinforced soil, and has a wide range of application prospects in traffic transportation subgrade engineering. To investigate the confinement effect of geocell on the mechanical characteristics of reinforced sand subgrade, this paper analyzes the macro-mechanical properties of reinforced sand subgrade using triaxial tests, investigates the micro-reinforcement mechanism employing discrete element method (DEM)-based simulations. The potential macro–micro linkages are studied. The experimental results revealed that the volumetric strain of the geocell-reinforced samples increased with the material’s elastic modulus, exhibiting a shear shrinkage phenomenon. The deformation pattern of the reinforced samples presented “segmental deformation,” which differed from that of the unreinforced sand samples. The geocell enhanced the cohesion intercept of the sand samples while having a minimal impact on friction angle. Through the analysis of numerical simulation results, it was found that the geocell constrained the displacement of the soil particles, altering the shear band development trend of the sample and resulting in “segmental deformation”. The geocell facilitated the concentration of force chains, enhancing their stability and resulting in improving the strength in the macro. Additionally, it was observed that the confinement effect of the geocell significantly reduced the fabric and force anisotropy of the granular soil, promoting consistent vertical alignment of force chains. This, in turn, enhanced the vertical force transmission capacity of the sample, explaining the micro-mechanism by which the confinement effect of the geocell increases the peak shear strength of the samples.

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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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