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国家重大科学项目500m大射电望远镜(简称FAST)选址贵州平塘,台址地质构造复杂,工程地质条件较差,根据FAST结构的要求,其建在直径为600m圆周上的六个馈源支撑塔基为主要承重部位,为有效地评价塔基的稳定性,治理工程地质病害,本文以地质雷达在FAST馈源支撑塔地基探测为实例,分析了地质雷达技术在这种地形条件较差的环境中应用的可行性,在探测结果与开挖验证的精度对比分析中,总结得出在工程范围较大时,应分区进行现场物性试验,得到更精确的介质相对介电常数,从而提高探测解释的精度,说明了物探技术在岩溶地基探测中发挥的重要作用。随着物探方法研究的不断深入和雷达天线及信号处理技术的迅速发展,GPR技术将能更广泛地服务于工程建设领域,特别是国家重大项目。
National Major Science Project 500m Radio Telescope (FAST) is located in Pingtang, Guizhou Province. The geological structure of the site is complex and the engineering geological conditions are poor. According to the requirements of FAST structure, it is built on six feed supports with a diameter of 600m In order to effectively evaluate the stability of the foundation and control the engineering geological diseases, this paper takes the ground-based detection of the foundation of the FAST feed support tower as an example to analyze the effect of the geologic radar technology on the poor terrain conditions The feasibility of the application in the environment, in the comparative analysis of the detection results and the accuracy of excavation verification, concluded that the larger the scope of the project, the district physical properties should be zoned to get more accurate dielectric relative permittivity, thereby enhancing the detection The accuracy of interpretation explains the important role played by geophysical techniques in the exploration of karst ground. With the deepening of the research on geophysical methods and the rapid development of radar antenna and signal processing technology, GPR technology will be able to serve the construction field more widely, especially for major national projects.