盾构区间近距离下穿铁路桥梁影响分析

Influence of Shield Tunnel Crossing under Railway Bridge within Close Distance

以深圳地铁7号线某区间工程为分析原型,分别采用经典的Peck法和有限元法对盾构近距离下穿浅基础铁路桥梁的沉降进行了研究、分析,介绍了为控制沉降而采取的施工措施,并将计算得到的理论值和现场施工的实际监测值进行了对比研究。验证了施工措施的有效性及设置参数优化试验段的必要性,总结了施工过程的沉降变化特点,得到Peck法的参数选择应谨慎、实测应覆盖施工全过程的结论。

Accroding to the engineering of a certain range on Shenzhen Metro Line 7, the settlement of shallow railway bridge foundation crossed by the shield tunnel within close distance is analyzed, in which the classic Peck method and finite element method are used. The control measures are introduced, the theoretical value and the actual monitored value of the site construction are compared. The risibility of the engineering and the setting up of parameter optimization test section are verified. Through summarizing the settlement changes in construction, it is concluded that the selection of Peck method shall be cautious and the measured data shall cover the full process of metro engineering.