Device and segmented monitoring method for mounting of recyclable direct-current electrical method electrode in long drill hole

Abstract

The invention discloses a device and a segmented monitoring method for mounting of a recyclable direct-current electrical method electrode in a long drill hole. The device comprises pushing pipes, electrode carrying modules and multi-core cables, each electrode carrying module comprises a single-way pipe, an expansion capsule, an electrode plate and an elastic centralizer, the multi-core cables are arranged in the single-way pipes, the electrode plates and the multi-core cables are connected through double-core wires, and the capsules are expanded by inflating the pipes to make the capsule well coupled with the hole wall. During monitoring, the segment number, the monitoring segment number and the electrode distance are determined according to the drilling length, the multiple electrode carrying modules are connected with the pushing pipes one by one, a drilling machine is matched to continuously push the electrodes into holes, the electrodes are pushed to target measuring points, themulti-core cables are connected with an electrical method main machine, air is inflated into the pipes, an electrical method instrument is started, and data collection of the target segment measuringpoints is conducted; and then the air pressure in the pipes is removed, the device is pushed to the position of the next section of measuring point, data of each section of measuring point is integrated, and electrical monitoring of the whole hole section of the long drill hole is achieved. The device is simple to operate and can be repeatedly used.

Description

technical field [0001] The invention relates to a direct current method integrated electrode cable installation device and a direct current method monitoring method, in particular to a recyclable direct current method electrode installation device in a long borehole and a segmented monitoring method, belonging to the technical field of engineering geophysical exploration. Background technique [0002] In recent years, with the rapid development of directional drilling technology and equipment in coal mines, long-distance long-distance drilling has achieved great success in the monitoring of water-bearing structures and gas anomalies in my country's coal mines, as well as in the prevention and control of dynamic disasters such as water inrush, rock burst, and coal and gas outbursts. widely used. The maximum distance of long-distance drilling in coal mines has reached more than 2,000 meters, and the length of long-distance drilling in mines is still increasing, providing an imp...

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Problems solved by technology

Due to the limitation of the number of electrodes and the difficulty of manual push, this type of method is difficult to apply to the DC method monitoring in long boreholes. When the borehole length exceeds 100 meters, it is difficult to push the electrodes into the borehole only by manpower; in addition , this type of method requires grouting after the electrode enters the designated position of the borehole, and the electrode cable can only be used once, resulting in a large loss of electrode cable and poor flexibility; If it is used for other purposes, one hole cannot be used for multiple purposes, and the efficiency of drilling is low.

[0006] In recent years, scholars at home and abroad have carried out research on the installation of electrodes in holes and the monitoring of direct current in holes. For example, Chinese patent CN2015861914U discloses a power supply electrode in holes for direct current in wells. The plate is retracted by overcoming the elastic force of the supporting spring, so as to realize the lifting and moving of the electrode in drilling; however, the structure of the device is complicated, and it needs to be electrified to make the electromagnet work. Good contact, more importantly, the device cannot be used in the special working environment with high explosion-proof requirements in underground coal mines; in addition, when the device is used for long-distance monitoring, the existence of the electromagnet will increase the quality of the device, which is not convenient for manual operation

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