探地雷达在地质复杂环境下对富水区的超前预报

发布时间：2018-09-04 16:13

【摘要】：在地质复杂环境下进行隧道的开挖建设时前期勘察和设计很难完全与实际相符,因此有必要采用超前地质预报对不良地质进行勘察。其中水的存在往往会加剧不良地质的影响,需要得到更多的重视。探地雷达是超前地质预报中常用的一种手段,对不良地质和水的勘察都具有良好的应用效果,但是复杂环境下雷达波受到的干扰多、信息量大,这对雷达波的解译特别是对富水区的分辨带来了困难,容易引起误判、漏判。本文通过实例分析研究表明:结合本区域地质构造的雷达波形特征以及富水区探地雷达波形具有波长变长、主频降低、相位突变、能量衰减快、探测距离短等特点进行综合的分析是可以对富水区做出正确判断的。从而表明在复杂地质环境中采用探地雷达对富水区的超前地质预报是可行有效的。
[Abstract]:In the case of complicated geological environment, it is very difficult for the early investigation and design of tunnel excavation and construction to accord with the practice completely, so it is necessary to use the advanced geological forecast to survey the bad geology. The presence of water tends to aggravate the impact of bad geology and needs more attention. Ground penetrating radar (GPR) is a commonly used method in advanced geological prediction. It has a good application effect to bad geology and water survey. But in complex environment, radar wave is interfered by much, and the amount of information is large. This brings difficulties to the interpretation of radar waves, especially to the resolution of water-rich areas, which is liable to misjudge and miss judgment. Through the analysis of practical examples, it is shown that the radar waveform of the geological structure in the region and the ground penetrating radar waveform in the water-rich area have the following characteristics: the wavelength changes, the main frequency decreases, the phase changes, and the energy attenuates rapidly. A comprehensive analysis of the characteristics of short detection distance can be used to correctly judge the rich water area. The results show that it is feasible and effective to use ground penetrating radar in advanced geological prediction of water-rich areas in complex geological environment.
【作者单位】：中建海峡建设发展有限公司;
【分类号】：P631.3;U452.1

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