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

作　　者：王莉莉[1] 张钰 付世博 刘英杰 马松浩 Wang Lili;Zhang Yu;Fu Shibo;Liu Yingjie;Ma Songhao(School of Civil Engineering&Architecture,Northeast Petroleum University,Daqing 163318,China;China National Petroleum Corporation Northeast Sales Branch,Shenyang 110000,China)

机构地区：[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

出　　处：《黑龙江科技大学学报》2024年第3期424-432,共9页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省重点研发计划指导项目(GZ20220028)。

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。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 unidirectional freezing experiments in closed condition without water supplement,establishing a coupled thermo-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 about 41.1 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 

分 类 号：P642.14[天文地球—工程地质学]