摘要
地下水含盐量不同会影响土体的热力学性质,探究渗流条件下地下水含盐量对基坑坑底冻结温度场的影响,可为市政地下工程、矿井工程、海底隧道建设等提供科学依据。运用COMSOL水热耦合模块对含盐量不同的地下水基坑坑底冻结温度场发展规律进行研究,通过对比冻结壁的厚度和路径分析得到渗流条件下地下水含盐量对基坑坑底冻结温度场的影响规律。研究结果表明:当地下水含盐量>3%时,渗流对基坑坑底冻结帷幕的形成影响较大,相较于上游,下游区域受到的影响更明显;随着地下水含盐量的增加,积极冻结40 d后冻结帷幕温度逐渐升高,降温速率逐渐减慢,形成的冻结帷幕厚度也逐渐变薄,含盐量越高,冻结效果越差,降温速率越慢。
Difference in groundwater salinity can impact the thermodynamic properties of soil.Understanding the influence of groundwater salinity on the freezing temperature field at the bottom of foundation pit under seepage condition is crucial for municipal underground engineering,mine engineering,and undersea tunnel construction.In this study,we employed the COMSOL hydrothermal coupling module to investigate the development pattern of the freezing temperature field at the bottom of a foundation pit with varying salinity of groundwater.Through thickness comparison and path analysis of the freezing wall,we determined the effect of groundwater salinity on freezing temperature field:when salinity exceeds 3%,seepage flow significantly affects the formation of the freezing curtain at the pit’s bottom,and in particular,the downstream is more affected than the upstream.Furthermore,an increase in salinity leads to a gradual rise in the freezing curtain’s temperature after an initial freezing period of 40 days.This increase in salinity is also accompanied by slower cooling rate,thinner freezing curtain,and consequently,poorer freezing effects.
作者
任继勋
佳琳
阳建新
胡俊
林小淇
曾东灵
REN Ji-xun;JIA Lin;YANG Jian-xin;HU Jun;LIN Xiao-qi;ZENG Dong-ling(College of Civil and Architectural Engineering,Hainan University,Haikou 570228,China;Hainan Hydrogeology and Engineering Geological Survey,Haikou 570206,China;Hainan GeologicalComprehensive Survey and Design Institute,Haikou 570206,China)
出处
《长江科学院院报》
CSCD
北大核心
2024年第1期151-158,166,共9页
Journal of Changjiang River Scientific Research Institute
基金
海南省科技厅自然科学基金创新研究团队项目(522CXTD511)
海南省科技厅重点研发计划高新技术方向项目(ZDYF2021GXJS020)
海南省基础与应用基础研究计划(自然科学领域)高层次人才项目(2019RC148,2019RC351)
海南省自然科学基金青年基金项目(519QN333)。
关键词
基坑坑底冻结
水热耦合
渗流场
含盐量
数值模拟
freezing of foundation pit bottom
hydrothermal coupling
seepage field
salt content
numerical simulation
