不同系统单向冻结条件下土体冻胀率与冻结速率分析  

Analysis of Soil Frost Heaving Rate and Freezing Rate Under Unidirectional Freezing Condition of Different Systems

作　　者：王思文 姜国辉 李玉清[1] 孙健 WANG Si-wen;JIANG Guo-hui;LI Yu-qing;SUN Jian(College of Water Conservancy,Shenyang Agricultural University,Shenyang 110866,China;Sujiatun District Financial Affairs Service Center,Shenyang 110101,China)

机构地区：[1]沈阳农业大学水利学院,辽宁沈阳110866 [2]沈阳市苏家屯区财政事务服务中心,辽宁沈阳110101

出　　处：《水电能源科学》2021年第10期164-167,共4页Water Resources and Power

基　　金：辽宁省教育厅课题(LSNFW201912);辽宁省自然科学基金项目(2019-ZD-0719)。

摘　　要：冻胀率与冻结速率是描述土体冻胀特性的重要参数,为掌握土体在不同系统单向冻结条件下的冻胀率与冻结速率特点,在相同外界降温速率下开展了不同初始含水率土体在封闭系统与开放系统室内单向冻结试验,观测土体位移及温度垂向变化过程,分析土体冻胀率、冻结锋面迁移规律及冻结速率特点。结果表明,土体在开放系统下冻胀率随时间分布规律受土体初始含水率影响比封闭系统明显;开放系统下冻胀率形成的起始时间比在封闭系统下滞后至少4 h,并随着冻结时间的增长,冻胀率的增长差异愈加不同。两系统下冻结速率与冻结深度呈负相关,显著性分析P值为2.09×10^(-5),不同系统对土体冻结速率影响显著;同一系统下,土体的初始含水率对冻结速率亦有显著影响。Rate of frost heaving and freezing rate are important parameters of describing soil frost heave characteristics.To master the soil mass in different systems under the condition of unidirectional freezing frost heave rate and characteristics of freezing rate,at the same external cooling rate,indoor unidirectional freezing test in a closed system and open system were ccrried out under different initial moisture content of soil.The soil displacement and vertical temperature variation process were observed,and soil frost heaving rate,rate of freezing front migration rule and the characteristics were analyzed.The results show that the initial formation time of frost heaving rate in the open system lags at least4 h behind that in the closed system,and the distribution of frost heaving rate becomes more and more different with the increase of freezing time.Under the open system,the higher the moisture content of the recharge soil sample,the greater the growth of frost heave rate.Through significance analysis,P=2.09×10^(-5),it can be seen that different systems have significant impacts on soil freezing rate,and the freezing rate and freezing depth are negatively correlated in the two systems.In the same system,when the freezing depth is the same,the freezing rate of soil decreases with the increase of initial moisture content.

关 键 词：封闭系统 开放系统 冻胀率 冻结速率 

分 类 号：P642.14[天文地球—工程地质学]