应用瞬变电磁法小线框大电流探测水下构造
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摘要
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 an increasing in underwater engineering,it has developed from the simple engineering in the previous years to the complicated engineering with high difficulty accordingly.It is required to have a detailed understanding of underwater geological states and structures.Also,it is necessary to have an accurate detection of underwater structure conjunction surface and position,strike,and depth of rock formation,whereby providing an effective help for the construction of underwater engineering.Drilling is mainly adopted in detecting underwater engineering,Geophysical prospecting is mostly used in floating seismic detection.The Transient electromagnetic method(TEM) can adopt the ungrounded mode,whereby achieving the floating detection by the electric prospecting.As a result,the adaptation of high current and small coil transient electromagnetic method can be convenient to realize the detection of underwater structure.This paper describes the detection method and data processing key Points and detection results with real engineering examples of the Yangtze river.
With an increasing in underwater engineering,it has developed from the simple engineering in the previous years to the complicated engineering with high difficulty accordingly.It is required to have a detailed understanding of underwater geological states and structures.Also,it is necessary to have an accurate detection of underwater structure conjunction surface and position,strike,and depth of rock formation,whereby providing an effective help for the construction of underwater engineering.Drilling is mainly adopted in detecting underwater engineering,Geophysical prospecting is mostly used in floating seismic detection.The Transient electromagnetic method(TEM) can adopt the ungrounded mode,whereby achieving the floating detection by the electric prospecting.As a result,the adaptation of high current and small coil transient electromagnetic method can be convenient to realize the detection of underwater structure.This paper describes the detection method and data processing key Points and detection results with real engineering examples of the Yangtze river.
引文
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