论文部分内容阅读
在盾构隧道等效刚度连续模型中考虑了环缝影响系数的影响,推导了改进模型的力学计算公式,建立了隧道纵向变形曲率及环缝变形与环缝等效刚度之间的关系.利用该模型对上海某越江隧道进行了工程应用分析.根据盾构隧道临界状态的变形界值,初步建立了越江盾构隧道纵向变形曲率半径与环缝张开量间的关系.计算表明:与地铁盾构隧道相比,越江隧道曲率半径的限值要求可适当放宽.越江隧道纵向变形曲率半径小于1.257km时,环缝张开量大于6mm,环缝密封止水措施失效,隧道会出现严重的渗水漏泥现象.越江隧道螺栓极限应力状态相应的环缝张开量为21.00mm,此时环缝连接破环,不能满足隧道的结构性安全要求.
The effect of girth influence coefficient was considered in the continuous stiffness equivalent model of shield tunnel. The mechanical calculation formula of the improved model was deduced and the relationship between the longitudinal deformation curvature of the tunnel and the deformation stiffness of girth was established. The model is applied to the engineering analysis of a tunnel in Shanghai. According to the critical value of the deformation of shield tunnel, the relationship between the longitudinal deformation radius and the girth of the girth tunnel is established. The results show that: Compared with the tunnel, the limit of the radius of curvature of the tunnel can be properly relaxed.When the longitudinal deformation radius of curvature of the tunnel is less than 1.257km, the girth of the girth is more than 6mm, the seal sealing failure will fail and the tunnel will see serious water leakage and mud leakage The corresponding open gap of the bolt in the limit stress state of the tunnel across the tunnel is 21.00mm, at this time, the annular joint is broken and broken, which can not meet the structural safety requirements of the tunnel.