摘要
区间联络通道现已成为双线隧道建设必不可少的一部分,具有排水、防火、连通两隧道以及在隧道发生事故时作为“逃生通道”的作用。为准确掌握厦门滨海区隧道联络通道冻结法施工过程中温度场的发展规律,开展了厦门地铁六号线马集区间段2#联络通道冻结法施工全程监测与分析,并采用Diana有限元程序建立与放射状布置冻结孔完全相同三维数值模型分析了冻结施工过程中温度场随时间的变化规律,将数值分析结果与代表性点实测数据进行了对比。结果表明:各测点温度的变化趋势大体一致,测位点越深冻结效果越好;泄压孔压力初始时大小差异主要是由孔点所处的固有土压不同所致;距冻结管越近土体温度降速越快,冻结土强度越高,形成冻结壁后冻结效率相应提高;数值分析所得温度场是非对称的;该数值模拟方法具有便捷性、较好的可行性和较高的可靠性,可作为今后类似工程冻结施工温度场的预测方法。
Currently,cross-passages in the section of twin-tunnels have become an indispensable part,which has the functions,such as drainage,fire prevention,connecting the two tunnels,and acting as“escape passages”in tunnel accidents.To accurately grasp the development law of the temperature field during construction of tunnel cross-passages in seashore area in Xiamen using the ground freezing method,the full process monitoring and analysis of the ground freezing construction of No.2 cross-passage in Ma-ji section of Xiamen Metro Line 6 were conducted.Correspondingly,the three-dimensional finite element model was established to analyze the variation law of the temperature field in the process of freezing construction.The numerical results were compared with the measurements of some typical points.The results show that the tendency of the temperature change of each measuring point is basically the same,and the deeper the position of the point,the better the effect of freezing.In the early stage,the discrepancies of the pressures between various pressure relief holes are mainly caused by the inherent earth pressure of points at different positions.The closer to the freezing pipes the soil is,the faster the temperature drops,the higher the strength of the frozen soil.Accordingly,the freezing efficiency is enhanced after the formation of a frozen wall.The temperature field by the numerical analysis is unsymmetrical.This numerical modeling method is of convenience,good feasibility,and high reliability.It can be an approach to predict the temperature field in the process of freezing construction of similar projects.
作者
陈凯文
戴自航
张浩
王耀
CHEN Kaiwen;DAI Zihang;ZHANG Hao;WANG Yao(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Strait Construction and Development Co.,Ltd.,Fuzhou 350003,China)
出处
《工程地质学报》
CSCD
北大核心
2023年第5期1748-1756,共9页
Journal of Engineering Geology
基金
中国建筑第七工程局有限公司课题(资助号:CSCEC7b-2016-Z-2).
关键词
滨海区
联络通道
冻结法
温度场
数值模拟
Seashore area
Cross-passage
Ground freezing method
Temperature field
Numerical modeling
