地下水横向水平流速对人工水平冻结壁形成的影响  

Influence of Groundwater Transverse Horizontal Flow Velocity on the Formation of Artificial Horizontal Freezing Wall

作　　者：刘建刚[1] 刘泉[1] 周冬冬 朱旭芬[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]上海勘测设计研究院有限公司,上海200434

出　　处：《应用基础与工程科学学报》2017年第2期258-265,共8页Journal of Basic Science and Engineering

基　　金：国家自然科学基金表上项目(41272265)

摘　　要：基于多孔介质传热和渗流理论,建立渗流场和冻结温度场的耦合数学模型,采用有限元方法模拟了某地铁隧道与车站对接的加固工程中冻结温度场变化和冻结壁形成过程.研究表明,在矩形布孔方式下横向水平流作用的冻结壁呈不均匀对称状,垂直于地下水流向的冻结壁形成慢,平行于流向的冻结壁形成较快,且上游冻结壁厚度薄,下游冻结壁厚度大;在交圈时间上,垂直于流向的冻结壁中部交圈迟缓;流速的改变对上游冻结壁平均厚度影响最为显著.Based on the heat transfer and seepage theory a numerical model coupling seepage field and the in porous media with finite element method, freezing temperature field was established to simulate the changes of temperature field and the process of freezing wall formation during a strengthening project of a metro tunnel. After observation values, the simulation shows that the model validation with in-situ temperature freezing wall appears in an asymmetrical shape as the horizontal groundwater flow is normal to the axial of the tunnel. Perpendicular to the groundwater flow direction, freezing wall forms slowly and on the upstream side the thickness of the freezing wall is thinner than that on the downstream side. The closure time of th wall perpendicular to the groundwater flow direction increases at the middle of the bo downstream sides. The average thickness of the affected by the groundwater flow velocity. freezing wall on the upstream side e freezing th up and is mostly

关 键 词：地下水流速 冻结温度场 冻结壁 交圈时间 

分 类 号：TU445[建筑科学—岩土工程]