Excited polarization separation detection cable system and its laying method for excavating tunnels by double-side-wall pilot-pit method

Abstract

The invention discloses an induced polarization separated detection cable system of a tunnel dug according to a double side drift method and a layout method. The system comprises a measuring cable system, a power supply cable system and a grounding cable, wherein the measuring cable system comprises measuring cables, electrode access units, spring type measuring electrodes and a measuring cable concentrator, a plurality of spring type measuring electrodes are arranged, the plurality of spring type measuring electrodes are sequentially arranged in drilled holes at different positions of a working face and connected to the measuring cables through the electrode access units, the measuring cables at different positions are collected into general measuring cable through the measuring cable concentrator and then connected to an induced polarization instrument; and the power supply cable system comprises a general power supply cable and spring type power supply electrodes, a plurality of spring type power supply electrodes are arranged, the plurality of spring type power supply electrodes are sequentially arranged in drilled holes of the working face, and the spring type power supply electrodes are connected to power supply electrode access units on the general power supply cable respectively through hole dividing wires.

Description

technical field [0001] The invention belongs to the technical field of the induced polarization method using geophysical electrical method detection, and in particular relates to the electric method advanced detection and detection of the front of the tunnel face and surrounding water bodies or other unfavorable geological bodies excavated by the double side wall pilot pit method The invention relates to a forecasting technology, in particular to an excitation polarization separation detection cable system and a laying method for a tunnel excavated by a double-side pilot pit method. Background technique [0002] Different from the traditional tunnel full-section excavation method, the double-side-wall pilot pit method is mainly suitable for IV and V surrounding rock formations with large cross-sections and poor formations, unstable rock masses, shallow buried sections, biased sections, and tunnel entrances. part. In the process of tunnel construction, unfavorable geological...

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Problems solved by technology

[0003] The conventional induced polarization method is mainly used in tunnels or tunnels excavated in full section. For tunnels excavated in sections, due to the different footage of each part of the tunnel face, there is not yet a method that can be applied to this situation. The detection cables and the corresponding layout methods can only be detected separately at each part of the tunnel face, and finally the data are integrated. The whole process is time-consuming and labor-intensive, which has a certain impact on the normal excavation of the tunnel.

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