渗流作用下粉土质砂潜蚀演化特征与预测模型

陈勇; 闵泽鑫; 夏振尧; 隆海鹏

doi:10.11835/j.issn.2096-6717.2021.152

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渗流作用下粉土质砂潜蚀演化特征与预测模型

土木工程 | 更新时间：2023-09-19

- 渗流作用下粉土质砂潜蚀演化特征与预测模型
- Evolution characteristics and prediction model on suffusion of silty-sand subjected to seepage
- 土木与环境工程学报 2023年45卷第5期页码：18-25
- 作者机构：
  
  三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002
- 作者简介：
  
  陈勇(1980- )，男，博士，教授，博士生导师，主要从事土-水耦合作用机制及边坡稳定性评价研究，E-mail: cyonger@126.com。
  夏振尧（通信作者），男，博士，教授，博士生导师，E-mail： xzy_yc@126.com。
- 基金信息：
  
  国家自然科学基金联合基金重点项目(U2040207);中国地质调查局项目(0001212020CC60002)
- DOI：10.11835/j.issn.2096-6717.2021.152
  中图分类号： TU411.4
- 收稿：2021-06-07，
  
  纸质出版：2023-10-25
- 稿件说明：
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陈勇, 闵泽鑫, 夏振尧, 等. 渗流作用下粉土质砂潜蚀演化特征与预测模型[J]. 土木与环境工程学报, 2023,45(5):18-25.

CHEN Yong, MING Zexin, XIA Zhenyao, et al. Evolution characteristics and prediction model on suffusion of silty-sand subjected to seepage[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 18-25.
陈勇, 闵泽鑫, 夏振尧, 等. 渗流作用下粉土质砂潜蚀演化特征与预测模型[J]. 土木与环境工程学报, 2023,45(5):18-25. DOI： 10.11835/j.issn.2096-6717.2021.152.

CHEN Yong, MING Zexin, XIA Zhenyao, et al. Evolution characteristics and prediction model on suffusion of silty-sand subjected to seepage[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 18-25. DOI： 10.11835/j.issn.2096-6717.2021.152.

摘要

长期渗流作用下，土体发生内部潜蚀常会诱发结构变形甚至破坏。利用自主研发的渗流装置开展砂土潜蚀试验，研究渗流作用下不同初始孔隙比粉土质砂的颗粒流失过程及潜蚀演变特征，并阐明各影响因素的作用机制，建立颗粒流失量随水力梯度和时间增长的预测模型，继而基于颗粒级配试验和三相关系推演，揭示粒度分布与孔隙比的变化规律。结果表明：渗流作用易导致砂土内部细颗粒和砂粒流失并逐渐形成优势渗流通道，诱发砂土局部坍塌并在持续潜蚀后呈整体不均匀沉降变形，直至水压主要沿优势通道消散时，达到潜蚀稳定；初始孔隙比或密实度是影响土体潜蚀程度的主要内部因素，直接改变了颗粒移动的起动水力梯度、流失速率、累积总质量及土样沉降变形量，水力梯度增大会加快颗粒流失、通道形成和潜蚀稳定；建立的预测模型拟合度高，能较好地反映上述演化特征以及初始孔隙比和水力梯度对颗粒流失发展规律及稳定时间的影响；潜蚀对粉土质砂物理状态的影响主要表现在孔隙比总体增大而颗粒粒径的不均匀性降低。

Abstract

Soil suffusion induced by long-term seepage generally lead to deformation or damage of soil structure. The suffusion experiments of silty sand had been accomplished by the independently developed seepage instrument

to study the particle loss process and suffusion evolution characteristics of silty sand with different void ratios induced by seepage of different hydraulic gradients

and the influential mechanism of factors is understood on the sand suffusion

then a model is established to predict the increase of particle loss with seepage duration and hydraulic gradient. Furthermore

the development patterns are revealed of particles size distribution and void ratio during suffusion based on the particle grading test and three phases relationship. The results show that: firstly

fine and sandy particles are both washed away by the long-term seepage and some dominant seepage channels will form subsequently in the samples

and then the internal local collapse and the overall differential settlement will be induced by continuous suffusion

until the water pressure mainly dissipates along the dominant channel to achieve the suffusion stability. Secondly

the initial void ratio or compactness is the main internal factor affecting the degree of the seepage suffusion of the soil

which directly changes the hydraulic gradient threshold

loss rate

cumulative total mass of particle movement and settlement deformation of sandy samples. The increase of the hydraulic gradient will also accelerate the particles loss

channel formation and suffusion stability. Thirdly

the prediction model fits the experiment result well

which can reflect evolution characteristics above and the influence on particles loss process of initial void ratio as well as the hydraulic gradient. Finally

the void ratio of samples will increase and the uniformity of particle size will decrease during sand suffusion.

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references

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