老车站纵向约束长度对换乘站基坑变形影响的敏感性分析

由于受到场地限制，新建的地铁车站紧靠老地铁车站，形成平行换乘。为了保证基坑开挖过程中既有车站的安全，用隔墙将新地铁车站长条形基坑分成小基坑间隔开挖。老地铁车站纵向有几百米长，而隔墙范围内的基坑开挖段只有几十米，开挖段车站结构的变形受到两侧纵向车站结构的影响。采用三维板壳有限元进行分析时，改变隔墙两侧老车站纵向约束长度，对该参数影响基坑变形的趋势和程度进行了敏感性分析，提出了推荐值。

PARAMETER SENSITIVITY ANALYSIS OF THE EFFECT OF LONGITUDINAL RESTRAINT LENGTH OF OLD STATION ON DEEP PIT DEFORMATION OF TRANSFER METRO STATION

Due to the space restraint,new parallel transfer metro station will be built close to the old station. The divisional walls will divide the long strip pit into several small pits that will be excavated alternately to keep the old station stable and safe during deep pit excavation. The longitudinal length of the old station is several hundred meters and the nearby excavation range in the divisional walls is tens of meters,so the station deformation in the excavation is restrained by its two side longitudinal station structure. When the pit is analyzed by three-dimensional shell finite element,the longitudinal restraint length of old station is changed. The parameter sensitivity analysis is made on the effect and the reference value is proposed.