路基空间变化对土工格栅应变缓解能力和柔性路面车辙寿命的影响

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
Li Xiao , Jianfeng Xue , Wanqiang Xu
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引用次数: 0

摘要

本研究采用随机场有限差分分析法评估路基空间变化如何影响土工格栅加固的应变缓和能力以及加固路面的车辙寿命。土工格栅降低临界应变的能力采用应变缓解率进行评估,并在确定性方案和空间可变方案之间进行比较。分析涉及六种土工格栅加固布置,考虑了两种土工格栅刚度(G1 和 G2)和三种典型位置:基层顶部(L1)、中间深度(L1-2)和底部(L2)。主要发现包括(a) 基层空间变化会显著放大平均临界应变,导致不规则的应变和应力分布,进而影响土工格栅加固的应变缓和能力,并可能改变土工格栅的最佳位置。(b) 路基空间变化对土工格栅应变缓和能力的影响因临界应变类型、土工格栅位置、路基模量的变化系数和波动规模而异。当土工格栅位于 L2(G_L2)位置时,其缓解路基临界应变的能力会大打折扣。(c) 路基空间变化对 G_L2 加固路面车辙寿命的不利影响很大,可通过在路基表面均匀铺设一层很薄的基层来缓解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of subgrade spatial variability on strain-alleviating ability of geogrids and rutting life in flexible pavement

This study employs the Random Field Finite Difference Analysis to assess how subgrade spatial variability impacts geogrid reinforcement’s strain-alleviating ability and the reinforced pavement’s rutting life. The geogrid’s abilities to reduce critical strains are evaluated using a strain-alleviating ratio and compared between deterministic and spatially variable scenarios. The analysis involves six geogrid reinforcement arrangements, considering two kinds of geogrid stiffness (G1 and G2) and three typical positions: top (L1), mid-depth (L1-2) and bottom (L2) of the base course. Key findings include: (a) Subgrade spatial variability significantly amplifies mean critical strains and leads to irregular strain and stress distributions, which in turn impacts the strain-alleviating ability of the geogrid reinforcements and potentially changes the optimal geogrid position. (b) The impacts of subgrade spatial variability on the geogrids’ strain-alleviating ability vary with the type of critical strains, the geogrid position, and the coefficient of variation and scale of fluctuation of subgrade modulus. When the geogrid is located at L2 (G_L2), its ability to alleviate critical subgrade strain is significantly compromised. (c) The adverse effect of subgrade spatial variability on the rutting life of G_L2 reinforced pavement is significant and can be mitigated by homogenising a very thin sublayer at the subgrade surface.

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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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