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当前位置: 首页 > 文章 > 不同风化程度灰岩的地质雷达波形与频谱特征研究 西南大学学报(自然科学版) 2016,38 (6) 159-164
Position: Home > Articles > Study on Waveform and Frequency Spectrum Property of GPR for Limestone with Different Weathering Degree Journal of Southwest University(Natural Science Edition) 2016,38 (6) 159-164

不同风化程度灰岩的地质雷达波形与频谱特征研究

作  者：
吴霞;温世儒;晏长根;李又云
单  位：
江西理工大学;江西应用技术职业学院;长安大学
关键词：
隧道工程;风化灰岩;后处理;频谱特征;地质雷达
摘  要：
为了研究岩溶地区不同风化程度灰岩的地质雷达波形与频谱特征,以图步信至霍林郭勒一级公路为依托,采用SIR-3000型地质雷达在隧道施工期进行了大量的现场测试,从现场测试数据中筛选出从微至强风化程度灰岩的原始文件,利用RADAN后处理软件对筛选文件进行分析,得到了从微至强风化程度灰岩的波形与频谱特征,分析结果表明:对于从微至中风化灰岩,其线测和点测图像反射较弱,无明显的强反射特征,反射频谱能量分布较散,主频突出,其分布范围为80~95 MHz;对于强风化灰岩,其波形及频谱特征与灰岩的含水率有关,当含水率低于40%时,线测和点测图像反射强烈,反射频谱能量分布较散,主频突出,主频的分布范围为42~90 MHz.当含水率大于40%时,线测和点测图像反射均变弱,线测图像中存在信号模糊区,反射频谱能量分布集中,主频突出,主频的分布范围为15~70 MHz,具有明显的低频特征.研究内容能为岩溶地区隧道施工期地质雷达预报的解译判读提供一定的参考.
译  名：
Study on Waveform and Frequency Spectrum Property of GPR for Limestone with Different Weathering Degree
作  者：
WU Xia;WEN Shi-ru;YAN Chang-gen;LI You-yun;Jiangxi College of Applied Technology;Jiangxi University of Science and Technology;Chang`an University;
关键词：
tunnel engineering;;weathering limestone;;post-processing;;frequency spectrum property;;GPR
摘  要：
In order to study the waveform and frequency spectrum property of GPR(Ground Penetrating Radar)for limestone with different weathering degree in karst area,on the basis of TUBUXIN to HOLINGOL highway,the type of SIR-3000 GPR was adopted to make a lot of field measurement during the tunnel construction.Choosing the raw data of limestone with weak to strong weathering degree,and the RADAN post-processing software was applied to analyze the raw data to find out the waveform and frequency spectrum property.Facts and figures showed that:the strong reflection character of line-scan and pointscan image of limestone with weak to medium weathering degree is not obvious,and the spectral energy is decentralized,and the main frequency is prominent as well as the distribution range is 80~95 MHz,the waveform and frequency spectrum property of limestone with strong weathering degree is related to the water content,as when it is below 40%,the reflection of line-scan and point-scan image is strong,and the spectral energy is decentralized,and the main frequency is also prominent as well as the distribution range is 42~90MHz,but when the water content is greater than 40%,the reflection is become weaker,and the signal confusion zone is existed in line-scan image,and the spectral energy is concentrated,also the main frequency is prominent,and the distribution range is 15~70MHz,therefore the low frequency character is obvious.Results can provide certain reference for GPR interpretation of geological prediction for tunnel construction in karst area.

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