Crustal stress rapid measuring device and method of rock stratum under coal mine

Abstract

The invention discloses a crustal stress rapid measuring device and method of a rock stratum under a coal mine. The device specifically comprises an electric control high pressure pump and a handlance which are integrated, a high pressure pipeline, a packer, a pressure sensor, a flow sensor, a hydraulic fracturing measurement and control instrument and the like. The method comprises the steps that: a segment of tunnel stable in surrounding rock property is selected, and a group of boreholes are formed in the tunnel, and the packer and the high pressure pipeline are installed in the boreholes and are further connected with equipment such as the high pressure pump so as to carry out hydraulic fracturing; in the hydraulic fracturing process, the measurement and control instrument is utilized to monitor and display pipeline water pressure and displacement data curves; according to the recorded pressure data and curves, the magnitude of the crustal stress is automatically calculated; and a colored borehole observation instrument with an annular transparent soft tube and a dial is utilized to observe the crack orientation of the hole wall, and the direction of the crustal stress is further determined. The whole set of system is simple in method, easy to operate, compact in equipment structure, convenient to carry and very beneficial to the rapid and reliable measurement of the crustal stress of the rock stratum under the coal mine, thereby ensuring the safe exploitation under the coal mine.

Description

technical field [0001] The invention relates to the field of mine research, in particular to a rapid measurement equipment and method for underground stress of rock formations in mines. Background technique [0002] In-situ stress is the natural stress existing in the formation, and it is the fundamental force that causes deformation and destruction of underground engineering. [0003] For mining engineering, the layout, excavation, support, etc. of the working face, roadway and chamber under the mine, and the analysis of the stress change of the surrounding rock after the excavation of the roadway and the mining of the working face must be based on the distribution of in-situ stress. Some common problems such as severe deformation of the surrounding rock of the roadway are in the final analysis the original in-situ stress distribution is not clear, blind design leads to a series of mine pressure problems in subsequent mining. [0004] Therefore, accurate and rapid in-situ ...

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Problems solved by technology

[0006] However, there is currently no complete and portable method and equipment that can quickly measure the stress in coal-measure rock formations under the mine

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