Study of the one-dimensional consolidation and creep of clays with different thicknesses using different hypotheses and three elastic visco-plastic models

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-09-25 DOI:10.1007/s11440-024-02405-w

Ze-jian Chen, Peng-lin Li, Pei-chen Wu, Jian-hua Yin, Ding-bao Song

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Abstract

The one-dimensional consolidation analysis of clays considering creep compression is a classical issue in soil mechanics and geotechnical design. The major debate lies in how to predict the consolidation settlement for a thick layer in the field using parameters obtained from a thin specimen from the laboratory. Different hypotheses have been advocated, based on which various methods and constitutive models have been developed. However, there are still some questions unaddressed and concepts inconsistently used, which may mislead engineers in the selection of methods/models and may result in settlements underestimated on a risk design side. In this paper, a state-of-the-art review and a thorough comparison study are performed on the existing methods and models for the consolidation analysis of clays exhibiting creep, from theoretical derivations to numerical simulations in comparison with soil test data. An in-depth discussion is carried out on several key issues related to the thickness effects on the time-dependent compression behaviour of clays. The arguments of Hypothesis A and Hypothesis B are revisited based on the current development of constitutive theories. Three existing elastic visco-plastic (EVP) models that consider the creep compression implicitly during the whole consolidation process can perform well in predicting the settlement of clay layers with different thicknesses, and are in line with Hypothesis B. It is concluded that using existing EVP models based on porous-media continuum mechanics is a rigorous scientific method (also called “rigorous” Hypothesis B method), which is superior to the old Hypothesis A method which has logic errors and may result in unsafe underestimation of settlements.

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利用不同假设和三种弹性粘弹性模型研究不同厚度粘土的一维固结和蠕变问题

考虑蠕变压缩的粘土一维固结分析是土力学和岩土工程设计中的一个经典问题。主要争论点在于如何利用从实验室薄试样中获得的参数来预测厚土层在现场的固结沉降。人们提出了不同的假设，并在此基础上开发了各种方法和构造模型。然而，仍有一些问题没有得到解决，使用的概念也不一致，这可能会误导工程师选择方法/模型，并可能导致在风险设计方面低估沉降。本文从理论推导到数值模拟，再到与土壤测试数据的对比，对表现出蠕变现象的粘土固结分析的现有方法和模型进行了最新回顾和全面对比研究。深入讨论了与粘土随时间变化的压缩行为的厚度效应有关的几个关键问题。根据当前构成理论的发展，重新审视了假设 A 和假设 B 的论点。结论是，使用基于多孔介质连续介质力学的现有弹性粘塑（EVP）模型是一种严谨的科学方法（也称为 "严谨的 "假设 B 方法），它优于存在逻辑错误并可能导致不安全地低估沉降的旧假设 A 方法。

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来源期刊

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.