考虑温度梯度变化的地铁联络通道冻结法施工三维数值模拟  

Temperature Gradient Based 3D Numerical Simulation for Freezing Construction of a Metro Tunnel Cross Passage

作　　者：王彦洋 唐华瑞[2] 李顺群[3] 杜红普[4] 

机构地区：[1]天津市建设工程技术研究所,天津300204 [2]河南理工大学万方科技学院,郑州451400 [3]天津城建大学土木工程学院,天津300384 [4]河北工业大学能源与环境工程学院,天津300401

出　　处：《现代隧道技术》2015年第6期135-140,162,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(No.51178290);天津市自然科学基金项目(No.11JCYBJC02900)

摘　　要：冻结法施工过程中,冻结帷幕的温度场分布较大程度决定其力学行为。针对目前将冻结帷幕温度场均一化处理所存在的问题,文章考虑混凝土水化作用和主隧道管片与隧道内空气热交换所引起的冷量传递非一致性,结合天津地铁2#线机场延长段工程中2#联络通道的冻结法施工,利用有限元分析软件Midas/GTS分别建立冻结帷幕为均一温度场和存在温度梯度的两种物理模型,以此展开联络通道开挖施工的三维模拟分析。结果表明:联络通道冻结过程中喇叭口处存在应力集中,冻结帷幕底板位移变化较大;存在温度梯度模型所得结果较为符合工程实际,其冻结帷幕的应力、变形也更加合理。During freezing construction, the mechanical behavior of the frozen soil curtain mainly depends on its temperature field distribution. However, aimed at the current uniformization problems in temperature field distribution and based on the freezing construction of the No.2 cross passage of Tianjin Metro Line 2, two physical models with Midas/GTS software, i.e. one with a uniform temperature field and another with a temperature gradient, were established and a 3D numerical simulation was then carried out for the construction of a tunnel cross passage considering the nonuniformity of the cold transfer induced by concrete hydration and air heat exchange between the segment and the tunnel. The results show that stress concentration occurs at the bell mouth part of the cross passage during freezing, with a large displacement at the floor of the frozen soil curtain; the results from the model with the temperature gradient are more in line with the engineering practice regarding a more reasonable stress and deformation of the frozen soil curtain.

关 键 词：地铁 联络通道 冻结帷幕 梯度变化 温度场 

分 类 号：TU752[建筑科学—建筑技术科学] U231.3[交通运输工程—道路与铁道工程]