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| 探地雷达在桥塔塔基岩溶勘查中的应用及信号分析 | |
| 引用本文： | 杨天春,冯建新,王战军.探地雷达在桥塔塔基岩溶勘查中的应用及信号分析[J].物探与化探,2011,35(2):280-284. |
| 作者姓名： | 杨天春 冯建新 王战军 |
| 作者单位： | 1. 湖南科技大学,土木工程学院,湖南,湘潭,411201 2. 中南大学,信息物理工程学院,湖南,长沙,410083 |
| 基金项目： | 教育部高等学校特色专业建设点项目(TS11027) |
| 摘 要： | 以湖南省张家界—花垣县高速公路岩溶勘查为例,探讨探地雷达在竖直型岩溶勘查中的应用和效果;同时,说明复信号分析方法在探地雷达数据处理中的有效性。竖向岩溶的横向规模小,在雷达图像中相应的异常范围比较窄,异常不易分辨。首先对原始采集信号进行二维空间域滤波,再对信号进行Hilbert变换,提取雷达信号的瞬时振幅、瞬时相位和瞬时频率,然后对这些处理后的信号进行综合分析。研究结果表明,二维空间域滤波可大大消除高频噪声的干扰,提高信号的信噪比,多参数综合分析可提高探地雷达解释的精度,最终的钻探成果也验证了反演解释结果的正确性。 |
| 关 键 词： | 探地雷达 Hilbert变换 岩溶 高速公路 地质灾害 |
| 收稿时间： | 2010-03-30 |
THE APPLICATION OF GPR TO THE EXPLORATION OF KARST CAVES IN THE FOUNDATION OF BRIDGE TOWER AND ITS SIGNAL ANALYSIS |
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| YANG Tian-chun,FENG Jian-xin,WANG Zhan-jun.THE APPLICATION OF GPR TO THE EXPLORATION OF KARST CAVES IN THE FOUNDATION OF BRIDGE TOWER AND ITS SIGNAL ANALYSIS[J].Geophysical and Geochemical Exploration,2011,35(2):280-284. | |
| Authors: | YANG Tian-chun FENG Jian-xin WANG Zhan-jun |
| Institution: | 1. College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 2. School of Info-Physics and Geomatics Engineering, Central South University, Changsha 410083, China |
| Abstract: | Horizontal karst caves were frequently studied for geohazards prospecting in the past. In this paper, the application of GPR to vertical karst caves was introduced in Zhangjiajie-Huayuan Expressway of Hunan Province, and the effectiveness of the complex signal analysis was illuminated in GPR data processing. A vertical karst cave characterized by a small horizontal scale would arose an unintelligible anomaly in the GPR image, which could not be recognized easily. The authors first processed the GPR data by two-dimensional spatial filter, and then applied Hilbert transform to the data, thus obtaining the transient amplitude, transient phase and transient frequency. Finally, the authors analyzed the processed data synthetically. The results show that the spatial filter can remarkably eliminate high frequency noise and improve SNR of the signal. In addition, the accuracy of the GPR interpretation can be improved by the multi-parameter analytical method. Drilling results prove the correctness of the inversion interpretation. |
| Keywords: | ground penetrating radar (GPR) Hilbert transform karst expressway geohazards |
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