地下水渗流对砾石地层人工冻结过程的影响  

Effect of Groundwater Seepage on Artificial Freezing Process in Gravel Layer

作　　者：王天亮[1,2] 何亚梦 吴镇 李君君[5] WANG Tianliang;HE Yameng;WU Zhen;LI Junjun(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;Jinan Design Institute,China Railway Engineering Consulting Group Co.,Ltd.,Jinan Shandong 250022,China;Shijiazhuang Institute of Railway Technology,Shijiazhuang Hebei 050041,China)

机构地区：[1]石家庄铁道大学,省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [2]石家庄铁道大学,道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [3]中国矿业大学,深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [4]中铁工程设计咨询集团有限公司济南设计院,山东济南250022 [5]石家庄铁路职业技术学院,河北石家庄050041

出　　处：《中国铁道科学》2022年第1期1-8,共8页China Railway Science

基　　金：国家自然科学基金资助项目(51978426);国家自然科学基金青年科学基金资助项目(41801277);河北省高等学校科学技术研究项目(QN2018072);河北省高层次人才资助项目(A201903010)。

摘　　要：采用室内模型试验,研究地下工程中水渗流对砾石地层人工冻结过程的影响,分析砾石地层的温度场分布特征及冻结壁的形成过程、交圈时间和厚度演化机制。结果表明:人工冻结管的冷量扩散与地下水渗流之间存在显著的耦合效应;无渗流时,人工冻结过程中砾石地层上下游温度场呈现对称分布特征,且冻土圆柱和冻结壁厚度均匀一致;地下水渗流导致砾石地层上下游温度场呈现显著的不对称性,且渗流速率越大,不对称性越明显;冻结壁交圈时间随地下水渗流速率的增加而近似线性增长,渗流速率达到5.00 m·d^(-1)时为无渗流时的3.2倍;由于地下水渗流的"冲蚀"作用,上游冻结壁厚度随渗流速度线性减小,下游冻结壁厚度则线性增大,冻结壁呈现"马鞍"形状。The effect of groundwater seepage on the artificial freezing process of gravel layer in underground engineering was studied by indoor model test.The distribution characteristics of temperature field in gravel layer,as well as the formation process,closure time and thickness evolution mechanism of frozen wall were analyzed.The results show that there is a significant coupling effect between the cold diffusion of artificial freezing pipes and groundwater seepage.The temperature field of upstream and downstream in gravel layer presents symmetrical distribution characteristic with non-groundwater seepage in the process of artificial freezing,and the thicknesses of frozen soil cylinder and frozen wall are uniform.Under the effect of groundwater seepage,the temperature field of upstream and downstream in gravel layer presents significant asymmetry,and the higher the seepage rate,the more obvious the asymmetry.The closure time of frozen wall increases approximately linearly with the increase of groundwater seepage rate.When the seepage rate reaches 5.0 m·d^(-1),it is 3.2 times of that without seepage.Due to the‘scouring’effect of groundwater seepage,the upstream thickness of frozen wall decreases linearly with the increase of seepage rate,while the downstream thickness of frozen wall increases linearly,which leads to the formation of‘saddle shaped’frozen wall.

关 键 词：地下工程 砾石地层 温度场 地下水渗流 人工冻结 冻结壁 

分 类 号：U231.3[交通运输工程—道路与铁道工程]