摘要
当隧道在接近桥桩施工时,由于隧道土体的开挖导致地层扰动,致使桩基周围的土体产生附加应力,会对埋设在土体内的邻接桥梁桩基产生影响.桥梁桩基本身的一些参数,如桩基的长度、直径、布置方式等,也会对桥梁桩基产生影响.通过对某过江隧道建立盾构隧道数值模型,以隧道埋深、桩间距、桩基埋深和隧道穿越部分土体弹性模量四个影响因素为主要影响因素,对新建隧道地表沉降的影响和对既有桥桩的受力和变形进行了分析,总结并得出了影响规律.
When the tunnel is close to the bridge pile construction,the excavation of the tunnel soil causes the disturbance of the stratum,resulting in the additional stress of the soil around the pile foundation,which will afct the adjacent bridge pile foundation buried in the soil.Some parameters of the basic body of bridge pile,such as the length,diameter and arrangement of pile foundation,will also afct the bridge pile foundation.Through the establishment of a shield tunnel numerical model for a river crossing tunnel,taking the tunnel buried depth,the pile spacing,the pile buried depth and the elastie modulus of the soil of the tunnel crossing part as the main influencing factors,this paper analyzed the infuence of the surface settlement of the new tunnel as well as the stress and deformation of the existing bridge pile,summarized and obtained the influencing rules.
作者
李世仲
LI Shizhong(China Railway Construction Group Co.Lud,Beijing 100040,China)
出处
《铁道建筑技术》
2020年第7期126-130,共5页
Railway Construction Technology
基金
中铁建设集团有限公司科技研发计划项目(LX13-14)。
关键词
盾构
桥梁桩基
沉降
数值模拟
shield
bridge pile foundation
sttlement
numerical simulation
