径向冻融过程中软黏土水热力试验研究  

Hydro-thermal-mechanical experiment of soft clay during radial freeze-thaw process

作　　者：郭焕明 张虎 丑亚玲[1] 郑波[4] 胡金涛 韩善博 GUO Huan-ming;ZHANG Hu;CHOU Ya-ling;ZHENG Bo;HU Jin-tao;HAN Shan-bo(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;College of Civil Engineering and Transportation,Northeast Forestry University,Harbin,Heilongjiang 150040,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China;Southwest Research Institute of China Railway,Chengdu,Sichuan 611731,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]东北林业大学土木与交通学院,黑龙江哈尔滨150040 [3]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [4]中铁西南科学研究院有限公司,四川成都611731

出　　处：《岩土力学》2025年第3期905-915,共11页Rock and Soil Mechanics

基　　金：黑龙江省优秀青年基金(No.YQ2022D001);国家自然基金(No.41971085);四川省科技计划(No.2024NSFSC0158)。

摘　　要：为了探究径向冻融条件下软黏土水热力过程,开展了不同温度下软黏土冻融试验,对比分析了各冻融过程中土样温度、含水率、土压力、排水量和耗电量的变化规律。试验结果表明:冻融过程中土样实际温度下降速率均与冻结锋面的移动速率呈正相关关系,温度的传递效率主要与传热距离、传热介质和能量损失率有关;在土样冻结过程中,水分的迁移与冷端对水分的吸力作用和冻胀过程中冻胀对水分的相对作用密切相关;冻结过程中产生的环向和径向冷生构造会加速软黏土中水分的排出,冻胀力会对未冻区土体产生固结作用;通过对试验过程中冻结范围、排水量和耗电量的对比,发现试验温度为-15℃时在冻结过程中产生的融沉圈直径最大,此时的能耗比也最大,因此,将-15℃作为本系列试验的最佳冻结温度。In order to investigate the hydro-thermal-mechanical process of soft clay under radial freeze-thaw conditions,freeze-thaw tests of soft clay at different temperatures were carried out,and the changes in temperature,water content,soil pressure,water discharge,and power consumption of soil samples were analyzed and compared.The results show that the actual temperature drop rate is positively correlated with the moving rate of the frozen front,and the temperature transfer efficiency is mainly related to the heat transfer distance,heat transfer medium,and energy loss rate.During the freezing of soil samples,the migration of water is closely related to the suction effect of the cold end on water and the relative effect of frost heave on water.The circumferential and radial cryogenic structures produced during the freezing process will accelerate the discharge of water from the soft clay,and the frost heave force will produce a consolidation effect on the soil in the unfrozen area.By comparing the freezing range,water discharge,and power consumption during the test process,it is found that the diameter of the thawing circle generated during the freezing process is the largest when the test temperature is-15℃,and the energy consumption ratio is also at its highest at this point.Therefore,-15℃is taken as the optimal freezing temperature for this series of tests.

关 键 词：软土地基 人工冻结 水热力过程 最佳温度 

分 类 号：TU441[建筑科学—岩土工程]