异型变宽连续梁桩基托换变形监测分析
杨正华1段军朝2郭庆军1鄢玉胜3
Deformation Monitoring Analysis of Pile Foundation Underpinning of Irregular Widening Continuous Beam
YANG ZhenghuaDUAN JunchaoGUO QingjunYAN Yusheng
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作者信息:1.1.西安工业大学建筑工程学院， 710021， 西安；
2.2.中建三局基础设施建设投资有限公司， 430061， 武汉；
3.3.中铁第一勘察设计院集团有限公司， 710043， 西安
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Affiliation:School of Civil & Architecture Engineering, Xi’an Technological University, 710021, Xi’an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.12.019
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中图分类号/CLCN:U442.55
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栏目/Col:研究报告
摘要:
针对国内首例地铁暗挖隧道下穿异型变宽连续梁桩基主动托换工程，详细介绍了其主要监测项目、监测频率和主要控制值，采用远程自动监测和人工监测相结合的数据监测方式，通过对监测数据的回归分析，得到了整个托换工程中围护桩倾斜变化曲线和桥墩位移变化曲线，并进一步分析了托换过程中的顶升力与变形关系。研究结果表明：施工期间的各项监测结果均在预期范围内，控制效果良好；桩基主动托换桥墩位移容许值的确定，应考虑现有的施工工艺及设备在正常情况下可以达到的水平，以及千斤顶顶升完毕至后期隧道施工完毕可能产生的结构变形；千斤顶顶升阶段被顶升桥墩的竖向位移与千斤顶加载力为非线性关系。
Abstracts:
Targeting the first active pile underpinning engineering in China for metro underground-excavated tunnel under-passing irregular widening continuous beam, the main monitoring items, monitoring frequency and main control values are introduced in detail. By data monitoring mode combining remote automatic monitoring and manual monitoring, and through regression analysis of the monitoring data, the variation curves of retaining piles inclination and bridge piers displacement in the whole underpinning engineering are obtained. The relationship between lift-up force and deformation during underpinning process is further analyzed. Research results show that the monitoring data of construction is within the expected range, and the deformation control effect is good. The allowable values of pier displacement for active pile foundation underpinning should be determined by considering the achievable performance with existing construction technology and equipment under normal conditions, and the structural deformation that may occur from the completion of hydraulic jack lift-up to the completion of later stage tunnel construction. The relationship between the vertical displacement of the lifted pier and the hydraulic jack loading force during hydraulic jack lift-up process is nonlinear.
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