饱水盐碱砂层冻结法施工冻结特性研究  

Study on the Freezing Characteristics of Construction by Freezing Method in Saturated Saline-alkali Sand Layer

作　　者：温良涛 杨威 Wen Liangtao;Yang Wei(CCCC Third Highway Engineering Co.,Ltd.,Beijing 101300,China)

机构地区：[1]中交第三公路工程局有限公司,北京101300

出　　处：《市政技术》2025年第3期242-252,260,共12页Journal of Municipal Technology

基　　金：企事业委托课题:盐碱地区海相沉积粉质黏土层注浆-冻结联合技术研究及应用(TIDT11-05-2023-FW-023)。

摘　　要：随着城市地下空间建设的快速发展,人工冻结法被广泛应用于地铁联络通道的施工中。而在盐碱地层如滨海地区等采用冻结法施工时,盐碱含量高的地下水会影响地层冻结效果。然而,在饱和砂层中使用冻结法盐碱作用的影响尚不明确。盐碱的存在会影响地下水的热力学性质,从而影响冻结法的施工和效果。因此,为了探究不同含量的盐碱对冻结温度场和冻结壁的影响规律,应用自主设计的试验系统进行了室内模型试验。试验结果表明:冻结温度随盐碱含量的增加呈近似线性下降的趋势,且盐对冻结温度的影响程度大于碱;随着含盐量的增加,冻结壁交圈时间越来越长,冻结体的冻结温度也越来越高。该研究成果可为盐碱地层人工冻结施工设计与应用提供参考。With the rapid development of urban underground space construction,artificial freezing method has been widely used in the construction of subway connecting passages.When freezing method is applied to construction in saline alkali formations such as coastal areas,groundwater with high saline alkali content will affect the freezing effect of the formation.However,the impact of using freezing methods in saturated sand layers on saline alkali conditions is not yet clear.The presence of saline alkali can affect the thermodynamic properties of groundwater,and then affect the construction and effectiveness of freezing methods.Therefore in order to explore the influence of saline alkali with different contents on the freezing temperature field and freezing wall,an indoor model test is conducted by a self-designed experimental system.The experimental results show that the freezing temperature decreases approximately linearly with the increase of salt alkali content,and the influence of salt on the freezing temperature is greater than that of alkali;With the increase of salt content,the time for the frozen wall to turn around becomes longer,and the freezing temperature of the frozen body also becomes more and more higher.This research result can provide reference for the design and application of artificial freezing construction in saline alkali formations.

关 键 词：人工冻结 盐碱含量 温度场 冻结壁 

分 类 号：U231.3[交通运输工程—道路与铁道工程]