Device and method for while-drilling detection of roadway roof rock Protodyakonov coefficient based on sound level meter

Abstract

The invention discloses a method for while-drilling detection of the roadway roof rock Protodyakonov coefficient based on a sound level meter. In order to solve the problem of while-drilling detection of the Protodyakonov coefficient, namely an important rock mechanical index influencing a coal mine roadway roof anchorage supporting scheme, a roadway roof is drilled to form drill holes with the diameter being 32-42 mm; a bearing type while-drilling device loaded with a sound lever meter probe is installed on the rear portion of a drill bit; through combination with reading of a scale drill stem, the volume decibel values of the drill holes with different depths are tested in the drilling process; and based on the rock Protodyakonov coefficient (namely from 0.3 to 20) standard library established in a laboratory, the rock Protodyakonov coefficient in the roadway roof drilling range is obtained quickly by comparing the volume values with roadway in-situ rock drilling volume decibel values, harmful noise in the drilling process is converted into a favorable sound source, and the technology of while-drilling detection is achieved. The method is suitable for while-drilling detection of the Protodyakonov coefficients of typical sedimentary beds, including sandstone, shale and mudstone, of coal measure strata. The method has the advantages of being conveniently applied in site, being easy to implement and low in labor intensity, and not influencing normal production.

Description

technical field [0001] The invention relates to a detection-while-drilling device and method, which belong to the technical field of mine roadway support, and are especially suitable for roadway roof rock based on a sound level meter under geological conditions where the distance between bedding planes between different lithology rock layers on the roof of a coal mine roadway is small. Platts coefficient detection device and method while drilling. Background technique [0002] Roadway support is a key technology for safe coal mining, and roof accidents account for a considerable proportion of mine disasters. The main reason for roof accidents is that the lithological characteristics of local roofs have not been detected in time, resulting in insufficient support strength. . Therefore, during roadway construction, it is necessary to find out the lithological characteristics of the roadway roof in time, and change the support method or adjust the support parameters in time fo...

AI Technical Summary

Problems solved by technology

The core method is to use the geological core drill to take the core of the roof, and analyze the lithological characteristics of the roof according to the columnar structure of the core. Use anytime and anywhere; the borehole wall impression method is to use some non-flowing and elastic plastic materials to fit on the surface of the borehole, copy the internal contour of the borehole under test into a mold, and then measure the impression to evaluate the borehole under test The internal structure of the borehole, but it cannot measure the lithological characteristics of the roof, and cannot provide scientific and effective data for the design of the support method; the borehole wall observation method uses equipment such as rock formation detection recorders to view the internal scene of the borehole through the probe. It was directly photographed, but due to the influence of the underground environment of the coal mine, this method has a low accuracy of peeking, and the error of the parameters of the roof surrounding rock structure obtained by this method is relatively large; the geological radar detection is based on the electrical difference of the probed medium. Electromagnetic technology for precise discrimination and positioning of the interface, this method does not reveal the development of joints and fissures enough, and cannot effectively identify the lithological characteristics of the roadway roof stratum, which is the focus and difficulty in the design and construction of roadway support

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