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随着水下工程的日益增多,已从前些年的简单工程发展到复杂的高难度的工程。对水下的地质状况和构造要求更加详细地了解,需要对水下构造结合面以及岩层的位置、走向、深度更加精确的探测,为水下工程施工提供有效的帮助。在水下工程勘查中,常以钻探为主。物探以水上地震勘探为多,瞬变电磁法以其采用不接地方式,从而实现电法形式的水上勘探,采用小线框大电流瞬变电磁法可以方便地实现探测水下构造。本文以长江某工程实例说明其勘探的方法和数据处理要点及勘探效果。
With the increasing number of underwater projects, it has evolved from a simple project in the previous years to a complicated and difficult project. A more detailed understanding of underwater geological conditions and tectonic requirements requires a more accurate detection of the position, direction and depth of the sub-surface structural joints and strata, which will provide effective help for underwater construction. Underwater engineering exploration, often based drilling. Geophysical prospecting for water seismic exploration, transient electromagnetic method for its use of ungrounded manner, so as to achieve the form of electrical exploration of water, the use of small wireframe high current transient electromagnetic method can easily detect the underwater structure. In this paper, a project example of the Yangtze River to illustrate its exploration methods and data processing points and exploration results.