新桥建设后钱塘江海塘安全隐患探测与分析
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摘要
钱塘江某公铁两用大桥上游约20m处新建了一座铁路桥.如何评价新桥建设后的海塘内部质量现状,是否存在空洞等缺陷隐患,工程各方既重视又感困惑.本文在分析工程结构、新桥施工活动、堤身和堤基介质特点以及现有技术状况的基础上,采用了探地雷达、地震映像和瑞雷波法等探测方法.根据探测资料并结合海塘结构、地基特点及施工和运行中的具体情况,分析提出了铁路新桥建设后存在的可能对海塘安全运行有影响的堤身和堤基内部重点介质异常及潜在隐患.
A new railway bridge was build at the upper reaches zone of the old rail-road bridge,and the distance between the two bridges is only 20 m.How to evaluate the situation of seawall inner body quality(voids in seawall body or not) after the new bridge construction is still a great puzzle to engineers.Based on analysis on seawall structure,new bridge construction activities,mechanical parameters of seawall mediums and the development of different geophysical detection methods,integrated geophysical methods including Ground penetrating radar,seismic imaging and Rayleigh wave have been applied in this case study.Combined with seawall structure and the characteristics of new bridge construction activities,the influence caused by the construction activities has been discussed.Meanwhile,the important abnormal zones and hidden defects which can be harmful to the seawall after the new railway bridge construction,have been revealed by using integrated geophysical detection data.
引文
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