深厚软土区路桥过渡段差异沉降控制被引量：10

Differential Settlement Control of Road Bridge Transition Section in Deep Soft Soil Area

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摘要路桥过渡段差异沉降严重影响行车安全性和舒适性,深厚软土路段如何处理好路桥过渡段的工后沉降显得尤为重要。针对深厚软土区软基深度大、软基处理难度高、造价高的特点,总结了深厚软土区路桥过渡段刚性过渡、柔性过渡、刚–柔结合过渡三种差异沉降控制方案。针对三种过渡方案分别采用预应力管桩复合地基、真空预压+气泡混合轻质土路堤、长短桩复合地基进行工程实践,结合施工参数及监测数据对加固效果进行分析研究,并对三种软基处理过渡方案进行技术经济比较。研究表明,三种过渡方案均有效可行,但在施工周期、沉降控制效果和经济性上存在一定差异。总体上,当填土高度一定时,刚性过渡、刚–柔结合过渡造价相对较高,且处理深度越大,柔性过渡在造价上的优势越明显。 The differential settlement of road bridge transition section seriously affects the safety and comfort of driving.Ac-cording to the characteristics of deep soft soil area,such as large depth of soft foundation,high difficulty of soft foundation treatment and high cost,three differential settlement control schemes of rigid transition,flexible transition and rigid flexible combination trans-ition are summarized.According to the three transition schemes,prestressed pipe pile composite foundation,vacuum preloading+air bubble mixed light soil embankment and long short pile composite foundation are respectively adopted for engineering practice.Com-bined with construction parameters and monitoring data,the reinforcement effect is analyzed and studied,and the technical and eco-nomic comparison of three transition schemes for soft foundation treatment is made.The results show that the three transition schemes are effective and feasible,but there are some differences in construction period,settlement control effect and economy.In general,when the filling height is fixed,the cost of rigid transition and rigid flexible transition is relatively high,and the greater the treatment depth,the more obvious the advantage of flexible transition in cost.

作者何长明彭功勋 He Changming;Peng Gongxun(Guangzhou Municipal Engineering Design&Research Institute Co.,Ltd.,Guangzhou 510060,Guangdong,China)

机构地区广州市市政工程设计研究总院有限公司

出处《岩土工程技术》 2021年第5期294-298,共5页 Geotechnical Engineering Technique

关键词深厚软土路桥过渡段沉降控制刚性过渡柔性过渡刚–柔结合过渡 deep soft soil road bridge transition section settlement control rigid transition flexible transition rigid flexible combination transition

分类号 U416.1 [交通运输工程—道路与铁道工程]

作者简介何长明,男,1978年生,汉族,湖南邵阳人,硕士,高级工程师,主要从事岩土及道路工程的设计与研究。E-mail:348806358@qq.com第35卷第5期岩土工程技术Vol.35 No.52021年10月Geotechnical Engineering Technique Oct,2021。