摘要
以青海典型黄土隧道为背景,考虑隧道洞口段围岩的水热耦合环境,以含水率16%,18%黄土作为围岩材料,以有机玻璃为衬砌和洞门材料,进行相似比1∶50的寒区隧道洞口段室内模型试验,对冻胀作用下衬砌应力进行分析,并采用数值模拟方法对冻结过程进行温度场-应力场耦合计算。结果表明:2种含水率下围岩温度变化规律相似;随着含水率增大,围岩温度下降速率变快,衬砌切向应力和径向应力均增大;距温度加载位置越近,围岩温度下降速率越快;数值模拟结果与模型试验存在一定误差,但变化规律一致。
Taking the typical loess tunnel in Qinghai Province as the background,considering the hydrothermal coupling environment of surrounding rock at the tunnel entrance,using loess with water content of 16%and 18%as surrounding rock material and organic glass as lining and portal material,the indoor model test of tunnel portal section in cold region with similarity ratio of 1∶50 was conducted.The stress of lining under frost heaving was analyzed,and the coupled calculation of temperature field and stress field in freezing process was carried out by numerical simulation method.The results show that the variation law of surrounding rock temperature is similar under the two kinds of water content.With the increase of water content,the decrease rate of surrounding rock temperature becomes faster,and the tangential and radial stresses of lining increase.The closer to the temperature loading position,the faster the temperature drop rate of surrounding rock.There are some errors between the numerical simulation results and the model test,but the change law is consistent.
作者
葛志翔
刘志强
王建民
GE Zhixiang;LIU Zhiqiang;WANG Jianmin(China Railway Bridge&Tunnel Technologies Co.Ltd.,Nanjing 210000,China;Lanzhou Jiaotong University,Lanzhou 730000,China;Hangzhou Traffic Management Service Center,Hangzhou 310000,China)
出处
《铁道建筑》
北大核心
2020年第11期64-66,97,共4页
Railway Engineering
关键词
铁路隧道
黄土隧道
力学特性
模型试验
寒区隧道
温度场
应力场
水热耦合
railway tunnel
loess tunnel
mechanical properties
model test
cold zone tunnel
temperature field
stress field
hydrothermal coupling
