Method for carrying out transient electromagnetic forecasting on long-distance water-containing target body in front of tunnel face

Abstract

The invention provides a method for carrying out transient electromagnetic forecasting on a long-distance water-containing target body in front of a tunnel face. The method provided by the invention comprises the following steps: carrying out detection on the long-distance water-containing target body in front of the tunnel face by using a medium-power transient electromagnetic instrument, thereby obtaining observation data of the long-distance water-containing target body in front of the tunnel face; by using a damped least-square algorithm, completing an inversion process of apparent resistivity data, thereby obtaining an apparent resistivity parameter of the long-distance water-containing target body in front of the tunnel face; by using a genetic algorithm, obtaining an electric conductivity parameter of the long-distance water-containing target body in front of the tunnel face; according to the apparent resistivity parameter and the electric conductivity parameter, carrying out explanation on the observation data so as to obtain information of the long-distance water-containing target body in front of the tunnel face. By using the method disclosed by the invention, the information of the long-distance water-containing target body in front of the tunnel face can be obtained, thereby implementing a process of carrying out forecasting on the long-distance water-containing target body in front of the tunnel face by using a transient electromagnetic method.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a transient electromagnetic forecasting method for a long-distance water-containing target in front of a tunnel face. Background technique [0002] The 21st century is a period of great development of tunnels or tunnels and underground engineering. With the formulation of the grand blueprint for the development of the western region and my country's comprehensive construction of a well-off society, and the implementation of the people-oriented, comprehensive, coordinated and sustainable development strategy, my country's railways will plan to build "four vertical and four horizontal" rapid passenger transport networks by 2020, Accelerate the construction of coal transportation channels and container node stations; national road planning and construction of "five vertical and seven horizontal" national highway trunk lines, improve the road network, and fully increase the dept...

AI Technical Summary

Problems solved by technology

The instrument integrates transceivers, is light and small, and is not only suitable for on-site use in shallow and medium-level engineering surveys and structural research, but also more suitable for advanced prediction and detection of tunnel faces. However, due to the small power of this instrument, its detection distance limited

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