Graded depressurization type borehole crack detection method

Abstract

The invention relates to a graded depressurization type borehole crack detection method, and belongs to the technical field of determination of the rock mining damage range. A used system comprises atest probe, a drilling machine, a drilling rod and a control operating console, the test probe comprises a plugging device and a partial pressure assembly, the partial pressure assembly is connected with the tail plugging device via a communicating pipe and comprises primary and secondary converters, the secondary converter sleeves the primary converter and is in threaded connection with the primary converter, the plugging device comprises a water leakage pipe, a series joint and a rubber capsule, the rubber capsule wraps the water leakage pipe, a plugging cavity is formed between the rubber capsule and the water leakage pipe, and the two ends of the plugging cavity are fixed by fastening loops. The water leakage pipe is provided with water leakage holes, outside water enters the pluggingcavity via the water leakage holes, the rubber capsule is expanded, and a water injection cavity is formed with a borehole. An original operating system is simplified, the problem of drilling coilingis solved, plugging and observation processes are realized via the same outside, and are kept in different pressures, and pressure conversion is more sensitive and more stable.

Description

technical field [0001] The invention belongs to the technical field of rock mass damage range measurement, and in particular relates to a detection method for graded pressure-reducing drilling fissures. Background technique [0002] The measurement of the depth of the mining fracture zone in the mine floor is an important parameter to indicate the occurrence state of coal and rock. It is a key basic parameter in the study of mine water prevention and control. Therefore, in order to study the formation of water-conducting channels in mining surrounding rocks, it is necessary to grasp the law of rock movement and determine the height of mining damage zones. The on-site detection adopts a series of detection equipment represented by "double-end plugging leak detection device". There are multiple operation and control systems connected to the external terminals, and there are at least 2 or more pipelines in the corresponding interior. The operation process is cumbersome and The...

AI Technical Summary

Problems solved by technology

The on-site detection adopts a series of detection equipment represented by "double-end plugging leak detection device". There are multiple operation and control systems connected to the external end, and there are at least 2 or more pipelines in the corresponding interior. The operation process is cumbersome and There is a winding problem, and the stability is poor during the observation process

In the series of products, although the single circuit problem can be solved, there is a large range of water pressure conversion, and the stability of the conversion process is not good. It is not suitable to control the water pressure, which may easily lead to mechanical failure.

, the existing technology fails to solve the above problems at the same time

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