Effects of subgrade spatial variability on critical strains and effectiveness of geogrid reinforcement in flexible pavement

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Li Xiao, Jianfeng Xue
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引用次数: 0

Abstract

The objective of this study is to assess the impact of spatial variability in the subgrade layer on the critical response of pavements and the effectiveness of geogrid reinforcement, employing the random field finite difference analysis (RFFDA). A comprehensive parametric study was conducted to examine the influence of two crucial factors: the coefficient of variation (\({{\text{COV}}}_{E}\)) and scale of fluctuation (SOF) of the subgrade modulus. Further investigation was conducted to uncover the statistical and mechanical mechanisms underlying the impact of subgrade spatial variability with emphasis on the critical strain distributions and their correlation with both the overall modulus and the local spatial variability of the key influence zone. Furthermore, this study explored the influence of subgrade spatial variability on the effectiveness of geogrid in reducing critical strains, considering various placement positions and geogrid moduli. The following main conclusions are drawn: (a) subgrade spatial variability has a substantial amplifying effect on critical pavement strains due to low modulus dominating effect, (b) there exists a worst value of SOF that results in the most unfavorable statistics of critical subgrade strain, (c) the effect of subgrade spatial variability on critical subgrade strain is more pronounced compared to its effect on critical asphalt strain, (d) the mean value of critical subgrade strain in RFFDA can be significantly underestimated when assuming fixed location for the strain, and (e) the effectiveness of geogrid in reducing critical strains is impacted by subgrade spatial variability, with the impact varying with the type of critical strain and geogrid location. Specifically, when placed at the base course–subgrade interface, the ability of geogrid to reduce critical subgrade strain is significantly compromised due to the subgrade spatial variability.

Abstract Image

路基空间变化对柔性路面临界应变和土工格栅加固效果的影响
本研究的目的是采用随机场有限差分分析法(RFFDA),评估基层空间变异性对路面临界响应和土工格栅加固效果的影响。通过全面的参数研究,考察了两个关键因素的影响:路基模量的变异系数({\text{COV}}}_{E}\)和波动尺度(SOF)。研究还进一步揭示了影响路基空间变异性的统计和力学机制,重点是临界应变分布及其与整体模量和关键影响区局部空间变异性的相关性。此外,考虑到不同的铺设位置和土工格栅模量,本研究还探讨了路基空间变化对土工格栅降低临界应变效果的影响。主要结论如下(a) 由于低模量主导效应,路基空间变异性对路面临界应变有显著的放大效应;(b) SOF 存在一个最差值,导致最不利的路基临界应变统计;(c) 与对沥青临界应变的影响相比,路基空间变异性对路基临界应变的影响更为明显、(e) 土工格栅降低临界应变的效果受基层空间变化的影响,其影响因临界应变的类型和土工格栅的位置而异。具体来说,当土工格栅被放置在基层-路基界面时,由于路基的空间变化,土工格栅减小路基临界应变的能力会大打折扣。
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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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