摘要
岩溶分布十分广泛,地下岩溶洞穴严重威胁着工程建设和人民的生命安全.了解岩溶地区的地质构造和岩溶发育规律,准确勘查地下岩溶洞穴,为各部门的工程设计与施工处理提供可靠的依据显得十分重要.地质雷达是采用高频电磁波、宽频带短脉冲和高速采样技术的一种新型的物探方法.由于该方法具有工作效率高、分辨率高和异常图象直观等突出优点,因此,该方法广泛应用于工程勘察中.多年来,在中国的铁路、公路、电站和机场等工程建设中,我们应用地质雷达方法作了大量的试验研究和生产工作,采集到了一些具有代表性的地下溶洞、溶缝和岩溶破碎的雷达图象,也积累了地质雷达探测地下岩溶洞穴的一些重要经验.本文从地质雷达探测地下岩溶洞穴的基本原理出发,从理论上对溶洞、溶缝和破碎带等的雷达图象进行模拟计算,提出了常见的地下岩溶异常的基本雷达图象特征,再结合典型的地质雷达图象实例,阐述了地下溶洞的埋深、规模、空间分布形态等判识方法.
The karsts distribute widely,and underground karsts ＆ caverns menace constructions and life of people seriously. It is very important to know geological structure and development regularities of karsts, and survey underground karsts ＆ caves exactly for engineering designing and dealing,so as to provide reliable scientific basis. The gedogical radar is a new geophysical prospecting equipment, which uses the electromagnetic wave of high frequency , short pulse of wide frequency band or sampling technicality of high rate. due to the technology of gedogical radar has many virtue such as high efficiency, high resolving power or the image is very clear, therefore, it is wide applied to project prospecting, for a long time past, In the railway,the highway,the hydropower station and the airport etc. build item in china, we had finished. Many tasks of the test study and the produce by the gedogical radar, had collected some representative GPR images about caverns,corrosion fissures and corrosion zones,also amassed some experiences about that the gedogical radar detects underground caverns. In this paper,on the basis of analyzing basic principled about that the geological radar detects underground caverns, the writer has done the analog computation about GPR image features of caverns（include corrosion zones） and corrosion fissure in terms of theory,raise the basic features of GPR image about underground caverns, according to typical GPR image features, expounded the key how to determine depth, scale and spatial distribution of cavern.
出处
《地球物理学进展》
CSCD
北大核心
2008年第1期280-283,共4页
Progress in Geophysics
关键词
地质雷达
探测
岩溶洞穴
模拟研究
gedogical radar, detection, cavern, physical analogue
