对欠固结土的超固结比的探讨

doi:10.16285/j.rsm.2021.1940

岩土力学 ›› 2022, Vol. 43 ›› Issue (S2): 85-94.doi: 10.16285/j.rsm.2021.1940

对欠固结土的超固结比的探讨

袁俊平^{1, 2}，陈龙^{1, 2}，梁艳³，丁国权^{1, 2}，殷宗泽^{1, 2}

1. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；2. 河海大学岩土工程科学研究所，江苏南京 210098； 3. 河海大学设计研究院有限公司，江苏南京 210098

收稿日期:2021-11-16 修回日期:2022-07-21 出版日期:2022-10-10 发布日期:2022-10-03
作者简介:袁俊平，男，1975年生，博士，教授，主要从事堤坝工程与非饱和土力学方面的研究工作。
基金资助:
国家重点研发计划项目（No.2018YFC1508505）。

Discussion on overconsolidation ratio for underconsolidated soils

YUAN Jun-ping^{1, 2}, CHEN Long^{1, 2}, LIANG Yan³, DING Guo-quan^{1, 2}, YIN Zong-ze^{1, 2}

1. Key Laboratory of Ministry of Education for Geotechnical and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Geotechnical Engineering Institute, Hohai University, Nanjing, Jiangsu 210098, China; 3. Hohai University Design Institute Co., Ltd., Nanjing, Jiangsu 210098, China

Received:2021-11-16 Revised:2022-07-21 Online:2022-10-10 Published:2022-10-03
Supported by:
This work was supported by National Key R&D Program of China(2018YFC1508505).

摘要/Abstract

摘要：

欠固结土是在自重作用下尚未固结完成的土，欠固结土的超固结比（overconsolidation ratio，简称OCR）取值在现有文献中可见两种不同的表述，分别是等于1和小于1，这容易导致概念混淆和超固结比取值误用等问题。对国内外使用较为广泛的土力学教材中超固结比相关内容进行了整理，发现超固结比有两种不同的定义表达式，这两种表达式中分母的不同是导致欠固结土超固结比取值差异的根源。采用知识图谱法，对超固结比和欠固结土的概念内涵、历史源头和研究应用等进行了综合分析，结果表明：研究欠固结土相关问题时，采用固结度或固结状态参数作为分析变量可完全替代超固结比的作用；将超固结比定义为前期固结应力与现有有效应力的比值（即OCR = p_c/p′₀，p_c为前期有效固结压力，p′₀为竖直有效应力），契合应力历史对土体工程特性影响的内在机制，也符合概念的历史渊源。

关键词: 欠固结土, 超固结比, 前期固结应力, 应力历史, 知识图谱

Abstract:

Underconsolidated soil is the soil that has not finished consolidation under its self-weight. At present, there are two types of overconsolidation ratio for underconsolidated soil in literature, i.e., equal to 1 and less than 1 respectively, which may cause confusion or misusing problems. We have sorted out the relevant contents of overconsolidation ratio in the widely used soil mechanics textbooks and found that there are two different definitions for overconsolidation ratio, where the different denominators result in the difference of overconsolidation ratio for underconsolidated soil. Using knowledge graph method, we comprehensively analyze the conceptual meaning, historical origin and practical applications for overconsolidation ratio and underconsolidated soil. Results show that degree of consolidation or consolidation state parameters can be used as substitution for overconsolidation ratio while involved in the problems related to underconsolidated soil. Overconsolidation ratio should be defined as the ratio of preconsolidation stress to existing effective stress (OCR = p_c/p′₀, p_c is the effective consolidation pressure in the early stage, p′₀ is the vertical effective stress), which is consistent with the influence mechanism of stress history on soil behavior, as well as the historical origin meaning of the concept.

Key words: underconsolidated soil, overconsolidation ratio, preconsolidation stress, stress history, knowledge graph

中图分类号: TU441

袁俊平, 陈龙, 梁艳, 丁国权, 殷宗泽, . 对欠固结土的超固结比的探讨[J]. 岩土力学, 2022, 43(S2): 85-94.

YUAN Jun-ping, CHEN Long, LIANG Yan, DING Guo-quan, YIN Zong-ze, . Discussion on overconsolidation ratio for underconsolidated soils[J]. Rock and Soil Mechanics, 2022, 43(S2): 85-94.

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对欠固结土的超固结比的探讨

Discussion on overconsolidation ratio for underconsolidated soils

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