探地雷达技术在异常体探测中的应用研究
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摘要
复杂地质条件下的异常体给盾构施工带来极大的隐患,而其独特的地球物理特征构成了探地雷达研究的物性前提。根据实际工程,为探明隧道周边异常体,采用探地雷达中剖面法反射多次覆盖采集方式,并通过滤波处理、增益控制等方法对采集信号进行处理。本文分析并总结了异常体雷达图像的具体特征,表现为相应段反射波同相轴呈曲折、分叉。这些特征有助于判断出异常体的具体位置和规模,对盾构施工能起到积极的指导作用。
The complex geological conditions of abnormal body bring huge hidden trouble to the shield construction,and its unique geological and geophysical characteristic is geophysical prerequisite for the GPR research.Based on an actual project,profiles reflected and multiple cover acquisition methods were adopted to collect signals by the GPR in order to detect an abnormal body surrounding the tunnel.Signals collected were processed by filtering processing,gain control.The specific characteristics of their radar images were analyzed in the article,such as the corresponding section of reflection wave with phase axis is tortuous,bifurcate.These characters are helpful for determining the concrete position and scale of an abnormal body and can play a positive role to the shield construction.
The complex geological conditions of abnormal body bring huge hidden trouble to the shield construction,and its unique geological and geophysical characteristic is geophysical prerequisite for the GPR research.Based on an actual project,profiles reflected and multiple cover acquisition methods were adopted to collect signals by the GPR in order to detect an abnormal body surrounding the tunnel.Signals collected were processed by filtering processing,gain control.The specific characteristics of their radar images were analyzed in the article,such as the corresponding section of reflection wave with phase axis is tortuous,bifurcate.These characters are helpful for determining the concrete position and scale of an abnormal body and can play a positive role to the shield construction.
引文
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2刘晓东,张虎生,朱伟忠.高密度电法在工程物探中的应用[J].工程勘察,2001,4:64-65.
3王振东.浅层地震勘探应用技术[M].北京:地质出版社,1994.
4赵永贵,刘浩,孙宇,等.隧道地质超前预报研究进展[J].地球物理学进展,2003,18(3):460-464.
5熊祥斌.探地雷达图像分析技术在水工混凝土检测中的应用[D].北京.中国水利水电科学研究院,2006.
6董延朋.探地雷达在混凝土施工质量无损检测中的应用[J].物探与化探,2006,30(5):468-470.
7刘浩杰,白明洲.探地雷达在城市地铁工程中的应用[J].物探与化探,2006,30(3):280-282.
8范占峰,李天斌,孟陆波.探地雷达在公路隧道超前地质预报中的应用[J].物探与化探,2010,34(1):119-122.
9陈礼伟.地质雷达检测隧道衬砌质量中的问题研究[J].岩土力学,2003,24(增刊):146-149.
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