某地铁工程长距离联络通道水平冻结法加固设计与有限元分析

Reinforcement Design of Horizontal Freezing Method Applied to A Long-distance Link Passage of Metro Project,and Finite Element Analysis

以武汉轨道交通机场线盘龙城站—宏图大道站区间的长距离联络通道为工程背景,采用水平冻结法加固地层的施工方法,对其进行冻结设计。采用COMSOL Multiphysics有限元软件对联络通道进行温度场分析,得到控制截面冻结壁的有效厚度及有效温度,均满足设计要求。分别采用结构力学方法和有限元方法对冻结壁厚度、强度及稳定性进行分析计算,结果表明,上述指标均满足设计要求,证明了冻结工艺设计的合理性。水平冻结法施工时,机场线联络通道采用双侧布置冻结孔和防偏技术,并严格控制温度变化,有效保证了工程安全顺利进行。

Taking the long-distance link passage between Panlongcheng Station–Hongtu Boulevard Station interval of Wuhan Rail Transit Airport Line as engineering background,the project adopts horizontal freezing method in construction to reinforce the stratum,and the freezing process is designed.By analyzing temperature field of the link passage with COMSOL Multiphysics finite element software,the effective thickness and effective temperature of the control section frozen wall are obtained,and both meet the design requirements.Structural mechanics method and finite element method are adopted respectively to analyze and calculate the frozen wall thickness,strength and stability.Results show that the above indicators all meet the design requirements,and the rationality of the freezing process design is proven.During horizontal freezing method construction,the airport line link passage adopts double-side freezing hole layout and anti-deviation technology,and temperature changes are strictly controlled,ensuring safe and smooth operation of the project effectively.