Theoretical and experimental study on identification of the soft interlayer in coal mine roadway roof
by Guangdong Yu; Guoying Meng; Xuewen Feng; Binglin Song; Shuaishuai Shang; Yuhang He
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 29, No. 2, 2022

Abstract: To identify the weak interlayer in roofs during the coal mine roadways support process and prevent roof-related accidents, this study proposes a soft interlayer roof detection system for mine roadways while drilling, whose drilling parameters can be detected using a pneumatic bolt machine, sensor and controller. The torque and speed of the pneumatic motor and the pressure and speed of the leg cylinder were used to detect the soft interlayer in the roadway roof. The calculation formula of the drilling parameters of the roof rock was derived and the effectiveness of the system is verified by finite element simulation. A test system for the roof rock formation identification system was developed and the identification test data were compared with the rock uniaxial compressive strength test data. The proposed system has three advantages: the roof rock layer interface (weak interlayer) can be identified; owing to the installation of the pneumatic electric proportional valve and controller, unmanned operations can be performed by the functions present in the computer control system; and by testing the drilling parameters of the pneumatic bolt rig system, the strength and position of each rock layer of the roof can be calculated. [Received: June 5, 2020; Accepted: January 20, 2021]

Online publication date: Fri, 14-Jan-2022

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