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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第04期

页码:

583-599

栏目:

黄河流域生态保护和高质量发展专刊(下)

出版日期:

2025-07-15

文章信息/Info

Title:

Experiment on the Influence of Physical State Variation on the Creep Characteristics of Hipparion Red Clay

文章编号:

1672-6561(2025)04-0583-17

作者:

祝艳波^*; 刘浩; 韦佳龙; 张宇轩; 刘振谦

(长安大学 地质工程与测绘学院,陕西 西安 710054)

Author(s):

ZHU Yan-bo^*; LIU Hao; WEI Jia-long; ZHANG Yu-xuan; LIU Zhen-qian

(School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China)

关键词:

三趾马红土;  滑坡;  蠕变;  干密度;  含水率;  本构模型;  黄土高原

Keywords:

Hipparion red clay;  landslide;  creep;  dry density;  moisture;  constitutive model;  Loess Plateau

分类号:

P642.22

DOI:

10.19814/j.jese.2025.02002

文献标志码:

A

摘要:

我国西北地区新近系三趾马红土易软化变形演化成大型黄土滑坡的滑带,三趾马红土松密、软硬多变的物理状态影响其长期蠕变行为。为此,开展含水率、干密度对三趾马红土蠕变特性影响试验研究,揭示其在不同物理状态下的差异蠕变行为,并基于五元件广义Kelvin模型探讨了模型参数随物理状态变化的响应规律。结果表明:①物理状态变化显著改变了三趾马红土的蠕变特性,含水率越高、干密度越小,其蠕变行为越强烈,更易演化为滑坡敏感区; ②五元件广义Kelvin模型可精准表征土体蠕变的瞬时变形、衰减变形、稳态变形等3个阶段,并能同步反映黏弹性与黏塑性变形的耦合效应; 相较于传统Merchant模型和Burgers模型,该模型在高荷载应力状态下对试样非线性流塑特性的预测精度显著提升,同时可有效反映试样含水率升高导致的流塑特性及干密度增大引起的压硬特性; ③模型参数随物理状态呈现规律性变化; 当含水率升高时,瞬时剪切模量G₀,黏弹性剪切模量G₁、G₂,黏滞系数η₁线性降低,而黏滞系数η₂呈非线性衰减,表明土体强度劣化与黏塑性流动加剧; 当干密度增大时,剪切模量G₀、G₁、G₂显著提升,黏滞系数η₁、η₂降低,表明土体密实程度的增加抑制了变形。

Abstract:

The Neogene Hipparion red clay in Northwest China is prone to softening and deformation, evolving into slip zones of large-scale loess landslides. The variable physical states of Hipparion red clay significantly affect its long-term creep behavior. To reveal the differential creep behavior under varying physical states, experiments were conducted to investigate the effects of moisture and dry density on its creep characteristics; furthermore, based on the five-element generalized Kelvin model, the response patterns of model parameters to physical state variation were explored. The results show that ① physical state variations markedly alter the creep characteristics of Hipparion red clay; higher moisture and lower dry density lead to more pronounced creep behavior, increasing susceptibility to landslide-prone areas. ② The five-element generalized Kelvin model accurately characterizes instantaneous, decay, and steady-state deformations during soil creep, while simultaneously reflecting the coupling effects of viscoelastic and viscoplastic deformations; compared to traditional Merchant and Burgers models, this model significantly improves prediction accuracy for nonlinear rheoplastic properties under high load stress state, effectively capturing rheoplastic behavior induced by elevating moisture and pressure-hardening characteristics caused by increasing dry density. ③ Model parameters exhibit systematic variations with physical states; as moisture increases, the instantaneous shear modulus(G₀), viscoelastic shear moduli(G₁, G₂), and viscosity coefficient(η₁)decrease linearly, whereas η₂ shows nonlinear attenuation, indicating soil strength degradation and intensified viscoplastic flow; higher dry density enhances G₀, G₁ and G₂, while reducing η₁ and η₂, demonstrating that denser soil suppresses deformation.

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备注/Memo

备注/Memo:

收稿日期:2025-02-07; 修回日期:2025-05-16
基金项目:国家自然科学基金项目(41877247); 中央高校基本科研业务费专项资金项目(300102264906)
*通信作者:祝艳波(1985-),男,辽宁阜新人,教授,博士研究生导师,工学博士,E-mail:zhuyanbo@chd.edu.cn。

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更新日期/Last Update: 2025-07-25