摘要
运营的地铁盾构隧道产生地层沉降是影响隧道结构运营安全的常见问题,而地铁列车动荷载被认为是影响隧道沉降的重要因素之一。针对郑州地区地铁列车长期运营动荷载作用下盾构隧道周边地层沉降,通过数值计算方法,建立列车动荷载曲线,将列车动荷载施加在隧道结构上,采用HS小应变模型可以更好地分析地层沉降。对隧道施工完成后运营期间列车荷载对隧道上方地层沉降的影响进行分析,并考虑小半径曲线时列车作用于轨道的水平向荷载对隧道上方地层沉降的影响进行分析。结果表明,隧道施工完成后考虑列车荷载以及小半径曲线作用于轨道的水平力,将导致隧道上方地层沉降加大。
The ground settlement is a common problem during the operation of subway shield tunnel that threats the tunnel safety.The vehicle vibration is one of the key factors inducing the settlement of shield tunnel.The numerical method was used to analyze the ground settlement induced by the vehicle vibration during the subway operation at Zhengzhou district for the first time.The time-history curve of vehicle vibration load was established to simulate the train load the hardening soil model was used in the numerical analysis of ground settlement.The ground settlement during the operation of subway was analyzed and the effect of small radius curve that produce horizontal load to the rail track was analyzed.The results showed that the vertical and horizontal vehicle vibration could enlarge the ground settlement during the operation of subway.
作者
刘力
李严威
李志佳
Liu Li;Li Yanwe;Li Zhijia(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,100082 China;Beijing Infrastructure Investment Co.,Ltd.,100101 China)
出处
《特种结构》
2020年第6期48-53,共6页
Special Structures
关键词
盾构隧道
列车动荷载
数值计算
地层沉降
Shield tunnel
Vehicle vibration
Numerical analysis
Ground settlement
