稳态瑞利波法在中国的应用及进展

采用电磁震源的稳态瑞利波法在我国应用已有近10年的历史,是我国应用最早的面波勘探方法。近10年来,通过理论和试验两方面的研究,在资料采集、处理和解释方面都取得了显著进展;确定"拐点"和"之字型"异常为D-_vR曲线上地层界面的两种基本异常形态;根据单条曲线的形态,可以确定洞穴、裂隙、松软带等地质异常的基本类型;并获得了深达一二百米以上的实测资料。稳态瑞利波法成功地应用到许多大、中、小型工程项目之中,解决了一些复杂的工程地质问题,在勘探深度、解释精度和空洞判断准确率方面都达到了较高水平。稳态法所具有的优势是其它类似物探方法包括目前的瞬态面波法很难比拟的。可以预见,随着稳态和瞬态方法、仪器的发展,两者互相促进,互为补充,必将进一步提高瑞利面波勘探的水平和解决各种复杂地质问题的能力。 

APPLICATION AND THCHNIQUE PROGRESS OF STEADY STATE RAYLEIGH WAVE METHOD IN CHINA

The steady state Rayleigh wave method with the electromagnetic seismic source, as an earliest applied surface wave exploration method, has been applied near ten years since in China. In recent ten years, based on both theoretical and test studies, the obvious progresses in the data acquisition, processing and interpretation were obtained; it is determined that the "flex point" and "zigzag" anomalies are two basic abnormal forms of stratigraphic boundaries on the D-_vR curves; based on the form of single curve, the basic types of geological anomalies such as cave, fracture, loose belt and so on are determined; and the measured data from the depth more than one or two hundred meters are obtained. This method has been successfully applied in the engineering projects of larger, medium and smaller types, and some complex engineering geologic problems were solved. The higher levels in the exploration depth, interpretation accuracy and cave diagnosis accuracy are attained. On these aspects, the advantages of steady state method are difficultly comparable by other similar geophysical methods including the present transient surface wave method. It can be predicted that both exploration level of Rayleigh wave and the capacity of solving various complex geologic problems would be further increased with the development of both steady state method and transient method as well as instrument.