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A Multi-source Seismic Interferometry Method for Advance Geological Prediction of Tunnels

A technology of advanced geological prediction and earthquake interference, which is applied in seismology, seismic signal processing, seismic signal receiver, etc., can solve the problems of insufficient research on advanced geological prediction, and achieve outstanding substantive features, no safety hazards, and pertinence strong effect

Active Publication Date: 2019-02-19
中铁西南科学研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the gradual maturity of the theory and method of seismic interference, this method has been applied to ultrasonic focusing and detection, small changes in the detection medium, natural seismic faults and volcanic activity, oil field dynamic monitoring, and pre-drilling prediction during drilling etc., but the research on advanced geological prediction for tunnel construction (drilling and blasting method) is insufficient

Method used

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  • A Multi-source Seismic Interferometry Method for Advance Geological Prediction of Tunnels
  • A Multi-source Seismic Interferometry Method for Advance Geological Prediction of Tunnels
  • A Multi-source Seismic Interferometry Method for Advance Geological Prediction of Tunnels

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Experimental program
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Effect test

Embodiment 1

[0064] Embodiment 1, adopt as Figure 5 The numerical simulation model of the cave shown. The size of the model is 370m in the horizontal direction and 350m in the vertical direction, and the tunnel section is 10m wide, located at 150-160m in the vertical direction of the model. The tunnel at the end of the blasting source layout has been excavated for 30m, and the tunnel at the end of the geophone layout has been excavated for 50m; on the central axis of the tunnel, a circular karst cave with a radius of 2m filled with air is set at 150m in the horizontal direction. In order to ensure that the numerical simulation is closer to the construction situation of the tunnel drilling and blasting method, 20 blasting sources are used, which are evenly arranged on the end face; 21 geophones are used, which are also evenly arranged on the end face.

[0065] After the blasting source is blasted according to the method of the present invention, the data is collected by the geophone group...

Embodiment 2

[0066] Embodiment 2, adopt as Figure 7 The fault numerical simulation model shown. The size of the model, the location of the tunnel, the excavation of the tunnel, and the location and quantity of blasting sources and geophones are the same as those in Embodiment 1 above. The set fault 1 is 30m away from the face of the geophone end, and the set fault 2 is 100m away from the face of the geophone end. Both faults are 2m wide and run through the entire model longitudinally.

[0067] After the blasting source is blasted according to the method of the present invention, the data is collected by the geophone group and subjected to seismic interference processing, and the obtained characteristic map is as follows: Figure 8 shown. It can be seen from the figure that there is an anomaly area 1 around 0.135 s, which is in the form of an interface, and its position is obtained at 29.7m by using the relationship between time and surrounding rock velocity, which is basically consisten...

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Abstract

The invention discloses a multisource seismic interferometry geologic advance prediction technology. Firstly, multiple seismic sources are arranged on a one-end tunnel face of a dug tunnel and a seismic geophone group is arranged on the other-end tunnel face and a side wall; then, all the seismic sources are detonated at the same time to excite seismic waves; through the arranged seismic geophone group, transmitted seismic waves are acquired, and seismic records are formed; and finally, the seismic records are subjected to seismic interferometry, a specific chromatogram of an un-dug tunnel area is acquired, and through analyzing the specific chromatogram, geologic advance prediction is carried out on the tunnel. Multisource and multipoint seismic exposure and multipoint seismic wave acquisition are adopted, a corresponding data processing algorithm is combined for inversion, the seismic wave specific chromatogram is acquired, and high-efficiency and accurate prediction on the bad geological body type, the features and the space position of the un-dug tunnel section is achieved; and through one-time prediction, geologic advance prediction on the un-dug tunnel section is realized, and the method has the advantages of far prediction distance, high efficiency, little loss, high accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering and advanced geological prediction, in particular to a multi-source seismic interference method for advanced geological prediction of tunnels. Background technique [0002] The main basis for tunnel construction is the design documents, but practice has proved that the design does not match the actual situation frequently, resulting in frequent disasters such as landslides, water gushing, and mud gushing in the tunnel, which is extremely harmful to safe construction and seriously affects the quality of the project. Especially in recent years, with the rapid development of my country's economy and the advancement of tunnel technology, the construction of railway tunnels and highway tunnels has continued to penetrate into the previous "geological forbidden zone". There are more and more complex and long tunnels, and geological problems are becoming more and more complicated. To ensure cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/20G01V1/30
CPCG01V1/20G01V1/306G01V2210/62
Inventor 吴丰收李静卢松
Owner 中铁西南科学研究院有限公司