2017年6月上第46卷第11期
DOI:10. 7672/sgjs2017110067
施工技术
CONSTRUCTION TECHNOLOGY
地铁隧道下穿桥梁桩基托换力学行为与参数研究
黄希，陈行晏启祥，宋乐阳，杨涛？
（1.西南交通大学交通隧道工程教育部重点实验室，四川成都610031；
2.中国水利水电第十三工程局有限公司，天津300384)
［摘要】以深圳地铁7号线黄木岗站区间隧道穿越华强立交桥桩基为工程背景，分析了隧道穿越桥梁下方桩基时的主动托换和被动托换的荷载转换、桩基沉降规律及主动托换时不同设计参数对桩基沉降的影响规律。结果表明：托换梁的挠曲变形是桩基沉降的主要因素，主动托换时千斤顶的顶升作用可有效抵消托换梁的挠曲变形，其托换效果优于被动托换；主动托换时，顶升位移为1.68mm时为最佳截桩位置，此时截桩能有效减小托换工艺对桥梁上部结构影响；在一定范围内，托换结构的桩长越长、桩径越大、梁高越高，被托换桩顶处竖向位移差越小，梁宽对位移差的影响程度不明显。
【关键词］地铁；桩基托换；托换桩；力学行为；数值模拟；沉降
［中图分类号］U455.43
【文献标识码］A
［文章编号】1002-8498(2017)11-0067-04
ResearchofPileFoundationMechanicsBehaviorandParameters
Underpinning of Subway RunningTunnel Passing Under
theExistingBridge
HUANG Xi',CHEN Hang',YAN Qixiang',SONG Leyang'，YANG Tao
(1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education,
Southest Jiaotong Unieersity, Chengdu, Sichuan 610031, Chind; 2. Sinohydro Tianjin Engineering Co. , Lid. , Tianjin 300384, China)
Abstract:Traversing Huaqiang flyover pile foundation by No. 7 line of subway in Shenzhen during the tunnel construction of Huangmugang station is taken as construction background, the load transfer of active underpinning and passive underpinning when tunnel traverses the pile foundation of flyover, settlement rule of pile foundation and influencing rules on settlement of pile foundation by different parameters when active underpinning are introduced. It turns out that the flexural deformation of seoeaaaaseeeeaa flexural deformation effect of underpinning beam when active underpinning and its underpinning effect are better than passive underpinning effect. When active underpinning, the best cut pile position is 1. 68mm of top displacement, and at this time, cut pile can effectively reduce the influences on upper structure of bridge by underpinning technology. Within certain range, the pile length of underpinning structure is longer, the pile diameter is larger and beam depth is higher. When vertical displacement of passive underpinning has small differential value, the influences on displacement differential value by beam are not obvious.
Key words: subways; pile foundation underpinning; underpinning piles; mechanics behavior; simulation;settlement
*国家科技支撑计划课题（2013BAB10B04）：国家自然科学基金项目（51178400；51278425）：中国铁路总公司科技计划重点课题
0）【作者简介】黄
，硕土研究生，E-mail;626738411@qq-com
[通讯作者］陈行，颈士研究生，E-mail：chenhangssd@163.com[慢福目期]势务数糖
67
本文依托深圳地铁7号线黄木岗站区间隧道穿越华强立交桥桩基工程，展开主动托换与被动托换的荷载转换与桩基沉降规律及设计参数对桩基沉降的影响规律的研究。