泥炭地道路路基服役期间长期沉降分析

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Nobutaka Yamazoe , Hiroyuki Tanaka , Satoshi Nishimura , Hirochika Hayashi
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引用次数: 0

摘要

泥炭地上的道路在使用期内应严格控制残余沉降,以尽量减少施工后的维护工作。本文讨论了有限元法(FEM)的适用性,将泥炭地的时间依赖模型纳入残余沉降的评估中。等厚粘塑性用于描述泥炭在变速率压缩下的行为,其适用性已在实验室试验中得到证实。长期固结试验结果和模型模拟揭示了泥炭地残余沉降的两种机制的特殊重要性,即固结系数cv的应力依赖性和粘性诱导的二次固结。采用捕捉这些机制的泥炭地模型进行有限元分析,并将其应用于日本北海道高标准道路建设的案例。通过标准固结仪测试确定的粘塑性参数成功地再现了在泥炭为主的高速公路路段中观察到的长期沉降。通过安装预制垂直排水沟(PVD),对分析进行了扩展,以解决泥炭地的沉降问题。结果表明,由于应力引起的cv降低而导致的一次固结延迟可以得到显著缓解,而长期二次固结引起的沉降几乎不受PVD的影响。这些见解指出了解开长期沉降的两种机制的重要性,以便在不同的时间尺度上准确预测残余沉降。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of long-term settlement of road embankment on peat ground during its service period

Roads on peat grounds are subject to stringent requirements in terms of controlling the residual settlement during their service period in order to minimize the post-construction maintenance work. This paper addresses the applicability of the Finite Element Method (FEM) by incorporating a time-dependent model for peats to an evaluation of the residual settlement. The applicability of isotach viscoplasticity, used to describe the peats’ behavior under variable-rate compression, was confirmed in laboratory tests. Long-term consolidation test results and a model simulation revealed the particular importance of two mechanisms in the residual settlement in peat grounds, namely, the stress-dependency of the coefficient of consolidation, cv, and the viscosity-induced secondary consolidation. A model peat ground, capturing these mechanisms, was implemented for the FEM and applied to a case history of a high-standard road construction in Hokkaido, Japan. The viscoplastic parameters determined from standard oedometer tests successfully reproduced the observed long-term settlement in a peat-dominated section of the expressway. The analysis was extended to address the settlement in the peat ground with the installation of prefabricated vertical drains (PVDs). The results indicate that the delayed primary consolidation due to the stress-induced cv reduction can be significantly alleviated, while the settlement arising from the secondary consolidation over a longer term is little affected by the PVDs. These insights point to the importance of untangling the two mechanisms of long-term settlement for the sake of making accurate predictions of the residual settlement in different time scales.

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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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