地铁隧道下穿桥梁桩基托换力学行为与参数研究

发布时间：2018-06-04 23:28

本文选题：地铁 + 桩基托换　；参考：《施工技术》2017年11期

【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。
[Abstract]:Based on the engineering background of the pile foundation of the Hua-Qiang overpass bridge between the Huangmugang station area of Shenzhen Metro Line 7, the load transfer between the active and passive underpinnings when the tunnel passes through the pile foundation under the bridge is analyzed. The law of pile foundation settlement and the influence of different design parameters on pile foundation settlement. The results show that the flexural deformation of the underpinning beam is the main factor of pile foundation settlement, and the jacking action of the Jack can effectively counteract the flexural deformation of the underpinning beam, and the underpinning effect is better than that of the passive underpinning. When the lifting displacement is 1.68mm, it is the best position of the truncated pile, which can effectively reduce the influence of the underpinning technology on the superstructure of the bridge, and in a certain range, the longer the pile length, the bigger the diameter of pile and the higher the beam height. The smaller the vertical displacement difference at the top of the underpinned pile, the less the influence of beam width on the displacement difference.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;中国水利水电第十三工程局有限公司;
【基金】：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(2014G004-H)
【分类号】：U231.3;U455

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