上跨地铁隧道的转换结构基础施工与附加荷载影响分析研究  

Influence of Foundation Construction and Additional Load of Transfer Structure on Underneath Metro Tunnel

作　　者：彭琦 PENG Qi(Shenzhen Municipal Design&Research Institute Co.,Ltd.,Shenzhen 518029)

机构地区：[1]深圳市市政设计研究院有限公司

出　　处：《现代隧道技术》2020年第1期99-104,共6页Modern Tunnelling Technology

摘　　要：上跨地铁隧道的转换结构施工会对下方地铁隧道结构造成影响:(1)转换结构基础的开挖施工卸荷会引起下方隧道结构的上抬变形;(2)高层建筑的荷载传递到转换结构,会引起大跨转换结构的挠度变形,转换结构与下方岩土体材料接触后会对下方地铁隧道结构产生附加荷载。基于此,文章以深圳某上跨地铁隧道工程为例,全过程模拟分析了地铁隧道正上方转换基础基坑开挖卸荷和地下水下降的耦合影响效应,并对转换结构铺设在褥垫层和直接铺设在岩土基础上的两种工况进行了对比分析,结果表明:转换结构铺设在褥垫层上会有效减小传递到地铁隧道结构的附加荷载,转换结构由于竖向挠度变形对下方地铁隧道产生的附加荷载的影响不容忽视。The transfer structure above a metro tunnel will affect the structure of metro tunnel underneath:(1)load relief due to foundation excavation of transfer structure will cause heaving of tunnel structure;(2)the load transmit⁃ted from the high-rise building to the transfer structure will result in deflection deformation of large-span transfer structure,and upon the transfer structure contacts with the rock-soil material it will apply additional load on metro tunnel.Taking certain project above metro tunnel as an example,the coupling influence of the load relief due to foundation excavation and dewatering is simulated,and a contrastive analysis is conducted regarding the two cases of transfer structure being laid on cushion and rock and soil.The results show that the transfer structure laid on cushion will effectively reduce the additional load transmitted to metro tunnel,the influence of transfer structure vertical de⁃flection induced additional load on underneath metro tunnel can′t be ignored.

关 键 词：转换结构 地铁隧道 基础施工 卸荷 附加荷载 褥垫层 

分 类 号：U239.5[交通运输工程—道路与铁道工程]