城际铁路隧道与邻近建筑物的相互影响研究

城际铁路隧道不可避免地要下穿建筑物密集的市区,其开挖施工会引起地表沉降,危及建筑物的安全,因此评估城际铁路隧道和邻近建筑物的相互影响就成为迫切需要解决的问题。文章以实际工程为例,将隧道、地基和上部结构作为一个整体,系统地研究了建筑物和下穿隧道的相互影响,针对不同的施工工法和不同的地质情况进行了敏感性分析,并对各类工程措施的效果进行了评估。研究结果表明,基础桩端嵌入地层性质对建筑物沉降、结构内力以及后续的加固处理措施影响很大;相对于隧道不同部位的桩基受隧道施工的影响各不相同,隧道正上方和侧上方45°附近桩基受开挖影响较大;同样地层情况下,盾构法开挖后建筑物的沉降和内力值要比矿山法低;桩基托换对整体沉降的控制要好于加固地层措施,然而桩基托换措施却增大了建筑物局部变形和内力值;建筑荷载作用位置附近隧道段内力会有所增大。因此需要预计各类可能的情况,并根据具体情况综合采取相应的措施。

Research on the Interrelationship of an Intercity Railroad Tunnel and Adjacent Building

It is necessary to evaluate the interrelationship of an intercity railroad tunnel and an adjacent building,since the construction under the existing building will result in ground settlement,endangering the safety of the building.This paper systematically studies this relationship using sensitivity analysis regarding different construction methods and geological conditions by taking the tunnel,foundation,and superstructure as a whole and evaluates the effects of various construction measures.The results show that:the ground affected by the base pile end has a great impact on building settlement,internal structural force,and sequential treating measures;a pile foundation right above the tunnel or with an angle of 45 degrees is greatly influenced by tunnel excavation;the settlement and internal force of the building after shield construction are lower than if a mining method were used;the effect of underpinning the pile foundation is better than that of ground reinforcement,but the former increases the local deformation and internal force of the building;and the internal force may increase near the place where the building load exists.