Sound level meter-based tunnel roof rock Protodyakovnov coefficient detecting-while-drilling apparatus and method

摘要

#$%^&*AU2017317602A120180621.pdf#####Abstract The present invention discloses sound level meter-based tunnel roof rock Protodyakonov coefficient detecting-while-drilling apparatus and a method. Aiming at the detecting-whiledrilling problem of the important rock mechanics index--Protodyakonov coefficient affecting the anchoring and supporting scheme of the coal mine tunnel roof, drill holes of D32~42mm are constructed in the tunnel roof, bearing type while-drilling apparatus with a sound level meter probe is arranged behind a drilling bit. A method of combining with the reading of a scale drill stem is used. In the drilling process, the volume decibel of drill holes with different depths is tested, the Protodyakonov coefficient of the rock within the range of the tunnel roof drill holes is obtained quickly by comparing with the volume decibel of the in-situ rock drilling in the tunnel in conjunction with the standard library of the rock Protodyakonov coefficient of 0.3 to 20 established in the laboratory, and harmful noise in the punching process is converted into useful sound source, thereby achieving the detecting-while-drilling technology. It is suitable for the detecting while drilling of the Protodyakonov coefficient of sandstone, shale, mudstone and other typical deposited rock strata of coal measure strata. It has the advantages of convenient use on site, simple operation, low labor intensity and no influence on normal production.