A Single Hole Directional Detection Radar Antenna for Advance Geological Prediction of Tunnels

Abstract

The invention discloses a single-hole directional detecting radar antenna for advance geology forecast of a tunnel. The single-hole directional detecting radar antenna mainly comprises a drilled directional radar antenna, an in-hole automatic travelling device and a cable receiving and sending device. The single-hole directional detecting radar antenna further comprises a rotor, a stator and a housing; a directional emission antenna in the rotor continuously rotates to change the emission direction of electromagnetic wave, the reflected wave can be received by a directional receiving antenna in the rotor, and the directional angle of a geological anomalous body can be obtained by the strongest reflection wave angle extracting algorithm; the in-hole automatic travelling device and the cable conveying and recovering machine can be controlled by a radar host to automatically send and recover a radar antenna and a communication cable. With the adoption of the single-hole directional detecting radar antenna, the geological anomalous body within a certain range around a drilled hole can be accurately examined, and the directional angle can be accurately positioned; the detecting directionality can be obviously improved; the resolution of the directional angle of the geological anomalous body can be obviously increased; the detection is fully automatically carried out, and therefore, the detecting efficiency and accuracy can be greatly increased.

Description

technical field [0001] The invention relates to a borehole directional radar antenna, in particular to a single-hole directional detection radar antenna for advanced geological prediction of tunnels. Background technique [0002] Borehole geological radar method is a broad-spectrum electromagnetic technology to determine the distribution of underground media. The transmitting antenna and receiving antenna are placed in the same borehole with a fixed distance. According to the two-way travel time, amplitude and waveform data of the electromagnetic wave at the receiving end, it can be The structural characteristics of the underground rock-soil medium are deduced. The interpretation of the borehole geological radar is to determine the geological characteristics of the reflected wave group through the tracking of the event axis in the geological radar image section obtained after data processing, according to the waveform and intensity characteristics of the reflected wave group...

AI Technical Summary

Problems solved by technology

[0005] Since the early 1980s, many international institutions have begun to study borehole directional radar technology. At present, there are two main methods: directional emission and directional reception: (1) The 3D-BHR radar system of the Netherlands T&A-RADAR company uses directional emission Due to the design defects of the directional transmitting antenna, the directional transmitting angle is relatively large, the azimuth angle positioning resolution of geological anomalies is low, and the size and weight of the antenna are too large, so the application in actual engineering is very limited; (2) the Swedish MALA company The RAMAC radar system adopts a directional receiving method, uses four omnidirectional sub-receiving antennas to form a receiving antenna array, and obtains the azimuth angle of the abnormal body by optimizing the data collected by the four sub-receiving antennas. However, due to the small distance between the antenna array and the existence of mutual Coupling interference, resulting in very low azimuth positioning resolution of geological anomalies, the actual detection effect is not ideal, and production has been discontinued

[0006] Generally speaking, at present, there is no effective single-hole directional geological radar instrument available at home and abroad. The main problems of single-hole geological radar are as follows: (1) Ordinary single-hole radar can only determine the distance of reflectors, but cannot give geological anomalies It is difficult to meet the actual engineering needs; (2) the existing single-hole directional radar system is complex and has low positioning resolution for geological anomalies, so its application in actual engineering is limited; (3) the existing single-hole radar detection The process automation is low, the operation is cumbersome and complicated, and the control accuracy of parameters such as antenna rotation angle and delivery distance during the detection process is low, which affects the actual detection effect

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