Three-dimensional while-drilling induced polarization rock precise imaging device and method

Abstract

The invention discloses a three-dimensional while-drilling induced polarization rock precise imaging device and method. The method is characterized in that a drilling bit in drilling serves as a power supply electrode A which is placed into a hole; a working face is provided with a three-dimensional array measuring electrode; an electrode N and an electrode B are arranged behind the working face; and while-drilling real-time data measurement and real-time three-dimensional inversion imaging are realized, and three-dimensional refined real-time imaging detection of unfavorable geology before the working face is realized. The method can realize while-drilling real-time measurement without interfering drilling construction; the power supply electrode is arranged in the drill hole, so that interference from metal bodies and the like behind a tunnel can be prevented; the drilling bit is served as the power supply electrode creatively; and the advance drilling machine is small in change, and in-hole induced polarization detecting precision and work efficiency are improved.

Description

technical field [0001] The invention relates to a three-dimensional fine imaging device and method for stimulating polarized rock mass while drilling. Background technique [0002] The detection of unfavorable tunnel geology plays an important role in the prevention of tunnel construction disasters. Because the induced polarization method is sensitive to water inrush disaster sources such as water structures, it is widely used in the detection of tunnel disaster sources. For the conventional section with relatively low risk of tunnel construction, the ordinary induced polarization detection method is usually used, and the power supply and measurement electrodes are arranged on the working face or the side wall. Under ideal detection conditions, the inrush water disaster in front of the tunnel working face can be realized source and other adverse geological exploration. Induced polarization is the most electrical detection method, which is greatly affected by the volume effe...

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Problems solved by technology

At the same time, the power supply electrode located in the hole can realize the fine detection of unfavorable geological bodies because it is close to the disaster source such as inrush water, and avoids the interference of metal equipment near the working face, so that the detection accuracy is higher. The current method of drilling detection The main technologies are as follows: [1] Non-drilling-while-drilling resistivity detection method: This method puts the detection device into the drilled hole in advance. Although the array-type measuring electrodes are used, the real-time detection of the drilling pipe is not realized. In the actual detection, it is necessary to stop the drill pipe and take it out so that the detection system can put it into the borehole for detection, which will consume a lot of time and cannot obtain the three-dimensional geological conditions ahead.

[2] With the excitation polarization detection method in the drilling hole: in this method, the detection system is arranged on the drill pipe through the sleeve, in which the power supply electrode A, the observation electrodes M and N, and the auxiliary electrodes A1 and A2 are all installed on the sleeve. The power supply electrode system and the measuring electrode system are linearly arranged, and the one-dimensional observation system cannot realize three-dimensional imaging of the bad geological conditions in front of the working face

[0006] Most of the induced polarization in the hole cannot be detected while drilling, and the detection needs to be re-arranged after the drill bit is advanced, which takes a lot of time; while the existing induced polarization method while drilling, the rotating sleeve and the connecting cable are easily damaged. Less efficient in practical applications

[0007] The power supply and measurement electrodes of the induced polarization detection method in the hole while drilling and non-while drilling are arranged in the hole, which belongs to the one-dimensional observation method and cannot realize three-dimensional inversion imaging

[0008] No real-time measurement data processing is performed during the drilling process, the detection results can only be given after the drilling is completed, and the detection results cannot be displayed in real time during the drilling process

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