平面应变卸载条件下黄泛区粉土力学特性试验研究

郭院成; 吉光照; 杜子博; 代新宇

doi:10.20174/j.JUSE.2026.01.17

地下空间与工程学报 >

2026 , Vol. 22 >Issue 1: 159 - 170

DOI: https://doi.org/10.20174/j.JUSE.2026.01.17

理论与试验研究

平面应变卸载条件下黄泛区粉土力学特性试验研究

郭院成 ,
吉光照 ,
杜子博 ,
代新宇

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1.郑州大学土木工程学院,郑州 450001;
2.中建八局第二建设有限公司,济南 250100

郭院成(1965—),男,河南辉县人,博士,教授,主要从事基坑支护工程施工力学和地基处理新技术方面的研究工作。E-mail: guoyuancheng@163.com

收稿日期: 2025-03-21

网络出版日期: 2026-03-03

基金资助

国家自然科学基金(51908513,U22A20598);河南省重点研发专项(231111322100,ZY2023A07)

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Experimental Study on Mechanical Properties of the Yellow River Alluvial Silt under Plane Strain Unloading Condition

Guo Yuancheng ,
Ji Guangzhao ,
Du Zibo ,
Dai Xinyu

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1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, P.R. China;
2. China Construction Eighth Bureau No.2 Construction Co., Ltd., Jinan 250100, P.R. China

Received date: 2025-03-21

Online published: 2026-03-03

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摘要

通过真三轴仪对黄泛区粉土进行不同固结围压、含水率条件下的平面应变侧向卸载试验,研究黄泛区粉土在平面应变卸载条件下的力学特性,并基于试验结果对比分析了经典强度准则对黄泛区粉土的适用性。结果表明:黄泛区粉土应力—应变曲线为弱硬化型,低含水率下呈脆性破坏,高含水率下为塑性破坏,破坏应变介于1%~6%之间;围压对卸载强度影响较大,含水率对其影响相对较小;小主应变卸载初期变化较小,轴向应变约1%时,小主应变近似呈线性增长;中主应力受围压影响较大,中间主应力在卸载前期快速下降,当轴向应变达0.5%~1%时趋于稳定;中主应力系数随轴向应变增加先快速下降后缓慢增加,破坏时介于0.27~0.37之间。侧向卸载路径下,Lade-Duncan强度准则可较好地预测粉土卸荷强度。

关键词： 平面应变试验; 侧向卸载; 黄泛区粉土; 应力路径; 强度准则

本文引用格式

郭院成 , 吉光照 , 杜子博 , 代新宇 . 平面应变卸载条件下黄泛区粉土力学特性试验研究[J]. 地下空间与工程学报, 2026 , 22(1) : 159 -170 . DOI: 10.20174/j.JUSE.2026.01.17

Abstract

The experiments of lateral unloading were conducted on the Yellow River alluvial silt under different consolidation confining pressures and water contents using a true triaxial instrument. Its mechanical properties under plane strain state of lateral unloading were studied. The applicability of the classical strength criterion to the silt was compared and analyzed based on the test results. The results show that: The stress-strain curves of silt show a weak hardening type under plane strain state of lateral unloading. The curves show brittle failure at a low water content, and plastic failure at a high water content, with a failure strain between 1% and 6%. The unloading strength is affected by confining pressure significantly, whereas the water content has a relatively small impact on it. The initial change of small principal strain during unloading is small, and the small principal strain begins to grow almost linearly when the axial strain reaches about 1%. The medium principal stress is greatly affected by the confining pressure, and it decreases rapidly in the early stage of unloading. The value tends to stabilize and does not decrease when the axial strain reaches 0.5% to 1%. The medium principal stress coefficient decreases rapidly and then increases slowly with the increase of axial strain. It is between 0.27 and 0.37 when the sample is damaged. The Lade-Duncan strength criterion could predict the unloading strength of silt well under plane strain state of lateral unloading.

Key words： plane strain test; lateral unloading; the Yellow River alluvial silt; stress path; strength criterion

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