Pure surface three-dimensional observation system suitable for high-speed rail tunnel bottom earthquake CT

Abstract

The invention belongs to the technical field of three-dimensional earthquake CT, and discloses a pure surface three-dimensional observation system suitable for high-speed rail tunnel bottom earthquakeCT. An earthquake source point is arranged on one side of the rail, and a receiving point is arranged on the other side of the rail. An earthquake wave is excited by the earthquake source point and passes through a tunnel bottom medium to enter the receiving point so as to receive an earthquake signal. The pure surface three-dimensional observation system disclosed by the invention can not only achieve three-dimensional fine detection of the tunnel bottom structure, but also can greatly reduce the exploration cost of the tunnel bottom detection; after once excitation of 24 excitation points arranged at equal intervals in the observation system, each wave detection point can receive 24 data, and the total data volume is 24*24=576, which is much higher than the 24 data of one array of the conventional two-dimensional detection, so that the fluctuation information amount of an underground geological body is greatly improved, the detection accuracy is greatly improved, and pure surface three-dimensional CT detection,that is, three-dimensional CT detection without drilling, is realized for the three-dimensional underground space data; and the exploration cost of the tunnel bottom detection is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional seismic detection methods and seismic data processing, and in particular relates to a pure surface three-dimensional observation system suitable for high-speed railway tunnel bottom seismic CT. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: conventional seismic CT technology is generally cross-hole CT between wells, and usually two-dimensional CT detection, but for high-speed rail tunnel bottom seismic CT, due to the high-speed rail tunnel after construction Due to the particularity of the tunnel bottom structure, drilling is not allowed in principle, nor is destructive damage to the surface of the tunnel bottom allowed, so conventional methods cannot be applied. [0003] To sum up, the problems existing in the existing technology are: the conventional seismic CT technology is generally cross-hole CT between wells, and us...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing technologies commonly used in the industry are as follows: conventional seismic CT technology is generally cross-hole CT between wells, and usually two-dimensional CT detection, but for high-speed rail tunnel bottom seismic CT, due to the high-speed rail tunnel after construction Due to the particularity of the tunnel bottom structure, drilling is not allowed in principle, nor is destructive damage to the surface of the tunnel bottom allowed, so conventional methods cannot be applied

[0003] To sum up, the problems existing in the existing technology are: the conventional seismic CT technology is generally cross-hole CT between wells, and usually two-dimensional CT detection, it is impossible to realize three-dimensional seismic observation without drilling Suitable for seismic observation at the bottom of tunnels

[0004] The difficulty and significance of solving the above technical problems: Difficulty: 1. So far, it is impossible to carry out seismic CT detection of railway tunnels without drilling, and neither 2D seismic CT nor 3D seismic CT can be realized; 2. , This is not only a problem of observation methods, but also involves the corresponding data processing methods and software problems

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