地质雷达在某止水帷幕质量检测中的应用

Application of ground penetrating radar to quality detection of water stop curtains

针对止水帷幕工程质量检测的特殊性,介绍地质雷达的系统构成和探测原理,并对仪器参数选取、测线布置、数据采集、数据处理和资料解释方法进行详细说明.通过工程实例,说明了地质雷达在止水帷幕工程质量检测中的应用效果.认为地质雷达可作为止水帷幕工程质量检测的重要手段.指出测线的布设除了沿帷幕走向布设长测线之外,还应在局部地段垂直帷幕走向布设短测线;必须把中频和高频天线配合使用;为满足横向分辨率的较高要求,应采用连续工作方式;介电常数应在工作现场通过实地测试并参考场地地质钻孔资料来确定,同时以此求取相应的速度参数,作为时深转换的依据.

In consideration of the particularity of quality detection of water stop curtains, an introduction was given to the composition and detecting principle of the ground penetrating radar system, parameter selection for apparatus, arrangement of surveying line, and methods for data acquisition, processing and explanation. The effectiveness of the ground penetrating radar in quality detection was demonstrated by its use in practical projects, and it was proved to be an important measure for quality detection of water stop curtains. It is proposed that, apart from some long surveying lines along the curtain, some short surveying lines should be set perpendicular to the curtain at some places, and that antennas of high frequency and mid-range frequency should be cooperatively used. Moreover, the continuous work pattern should be adopted to meet the requirement of high transverse resolution, and field tests should be carried out to obtain a precise dielectric permittivity based on the data of geological bores. Then, the corresponding velocity parameter could be obtained to provide a basis for time-depth conversion.