基于非饱和渗流的粗粒土冻胀特性
Frost heave characteristics of coarse-grained soil based on unsaturated seepage flow
王莉莉 1张钰 1付世博 1刘英杰 1马松浩2
作者信息
- 1. 东北石油大学 土木建筑工程学院,黑龙江 大庆 163318
- 2. 中国石油天然气股份有限公司 东北销售分公司,沈阳 110000
- 折叠
摘要
为探究冷端温度与初始含水率对粗粒土冻胀特性的影响,在封闭不补水条件下进行粗粒土单向冻结试验研究,并建立冻土水热力耦合模型,分析了多因素影响下的粗粒土冻胀特性.结果表明:冷端为-20℃时,冻结区域内各土层的降温速率约为冷端-5℃的3～4 倍,土体冻结深度比冷端-5℃时增加约41.1 mm;饱和土样在冷端处的冰体积含量为71.6%,其冻胀率约为含水率5%土样的4.5 倍;冷端温度较低的情况下土体内部的温度梯度更大且降温速率更快,土体含水率与冰体积含量、冰透镜体厚度呈正相关,对冻胀率影响更显著.
Abstract
This paper is an effort to investigate the effects of cold end temperature and initial moisture content on the frost heave characteristics of coarse-grained soil.The study involves carrying out the unidi-rectional freezing experiments in closed condition without water supplement,establishing a coupled ther-mo-hydro-mechanical model,and analyzing the frost heave characteristics of coarse-grained soil under the influence of multiple factors.The results indicate that when the cold end is-20℃,the cooling rate of each soil layer in the freezing zone is approximately 3 to 4 times that at-5℃,and the freezing depth of the soil increases by about41.1 mm compared to-5℃.For saturated soil samples at the cold end,the ice volume content is 71.6%,leading to a frost heave rate about 4.5 times than that of samples with a 5%moisture content.The temperature gradient within the soil is greater and the cooling rate is faster at lower cold-end temperatures.The soil moisture content is positively correlated with ice volume content and the thickness of the ice lens,and has a more pronounced effect on the rate of frost heave.
关键词
单向冻结试验/粗粒土/水热分布/冻胀特性/含冰量Key words
unidirectional freezing test/coarse-grained soil/hydrothermal distribution/frost heave characteristics/ice content引用本文复制引用
基金项目
黑龙江省重点研发计划指导类项目(GZ20220028)
出版年
2024
国家科技期刊平台
NSTL
万方数据