›› 2017, Vol. 38 ›› Issue (1): 300-308.doi: 10.16285/j.rsm.2017.01.038

• 测试技术 • 上一篇    

钻孔雷达探测地下不良地质体的正演模拟及其复信号分析

李 尧1,李术才1,刘 斌1,聂利超1,张凤凯1,徐 磊1, 2,王传武1   

  1. 1. 山东大学 岩土与结构工程研究中心,山东 济南 250061;2. 长江工程地球物理勘测武汉有限公司,湖北 武汉 430010
  • 收稿日期:2016-04-25 出版日期:2017-01-11 发布日期:2018-06-05
  • 通讯作者: 刘斌,男,1983年生,博士,副教授,主要从事应用地球物理与隧道超前地质预报等方面的研究工作。E-mail: liubin0635@163.com E-mail: liyao.sdu.edu@gmail.com
  • 作者简介:李尧,男,1989年生,博士研究生,主要从事地质雷达理论与仪器方面的研究工作。
  • 基金资助:

    国家重点基础研究发展计划(973计划)项目(No. 2013CB036002,No. 2015CB058101);国家重大科研仪器设备研制专项(No. 51327802);国家自然科学基金重点项目(No. 51139004);中国工程院咨询项目(No. 2015-05-ZD-002)。

Forward simulation and complex signal analysis of borehole radar detection for underground adverse geological bodies

LI Yao1, LI Shu-cai1, LIU Bin1, NIE Li-chao1, ZHANG Feng-kai1, XU Lei1, 2, WANG Chuan-wu1   

  1. 1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong 250061, China; 2. Changjiang Engineering Geophysical Exploration Wuhan Co., Ltd., Wuhan, Hubei 430010, China
  • Received:2016-04-25 Online:2017-01-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Program on Key Basic Research Project of China (973 program) (2013CB036002, 2015CB058101), the National Key Scientific Instrument and Equipment Development Project (51327802), the Key Program of National Natural Science Foundation of China (51139004) and the Consulting Research Project of Chinese Academy of Engineering (2015-05-ZD-002).

摘要: 在工程建设中经常会遇到诸如溶洞、裂隙带和断层破碎带等不良地质体,如果不能提前探明地下是否存在不良地质体及其含水情况,将会埋下严重的安全隐患。钻孔雷达是一种十分有效的探测方法,但迄今,尚未见有针对典型不良地质体进行正演模拟并进行复信号分析的工作。结合复信号分析技术,利用振幅、相位和频率等瞬时信息对钻孔雷达探测结果进行综合分析,能够提高解译的精度和准确性。针对溶洞、裂隙和断层等典型不良地质体无水和含水的情况分别建立了数值模型,利用地质雷达正演软件GprMax对数值模型进行了正演模拟,并使用复信号分析技术对正演结果进行了分析,获取了典型不良地质体的响应特征,且当不良地质体含水时,反射信号振幅增强、相位反转、频率降低。结合工程实例对钻孔雷达探测数据进行了复信号分析,正演模拟和工程实例都表明,利用复信号分析技术,可以更加方便地对地质异常体的形态分布及其含水情况进行分析,提高了钻孔雷达解译的精度和准确性。

关键词: 不良地质体, 钻孔雷达, 正演模拟, 响应特征, 复信号分析

Abstract: Engineering construction usually encounters adverse geological phenomena such as karst caves, fractures and faults. Thus, it is extremely significant for maintaining security to ascertain the adverse geological bodies in particular the conditions containing water. Borehole radar is an effective detecting method, however the issues in terms of forward simulation and complex signal analysis of adverse geological bodies have not been well addressed. To improve the precision and accuracy of interpretation, the complex signal analysis technique which utilizes instant information including amplitude, phase and frequency is adopted to analyze detected results. A numerical model is developed for adverse geological bodies with water and without water, and then GprMax, a ground penetration radar forward simulation software, is applied to implement the forward simulation. Numerical results are further analyzed by a complex signal analysis technique to obtain the response characteristics of adverse geological bodies. In particular, adverse geological bodies containing water enhance the amplitude of reflected signal, reverse the phase, and reduce the frequency. Finally, detected results from a case study are analyzed by using the borehole radar with the complex signal analysis technique. Numerical and field detecting results demonstrate that the complex signal analysis technique has the advantage to analyzing the morphological distribution and the water situation in adverse geological bodies. In addition, it increases the precision and accuracy of the data interpretation.

Key words: adverse geological bodies, borehole radar, forward simulation, response characteristics, complex signal analysis

中图分类号: 

  • TU 457

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