Abstract
Coal seam water injection is widely used to prevent rockbursts in coal mines, and the duration of water injection is an important parameter related to the effectiveness of rockburst prevention, making it of practical importance to optimize the effective water injection duration. This paper presents the test results of the mechanical properties and pore structure of samples with different soaking time, obtained from a working face where rockburst occurred. Soaking time changes the mechanical properties of samples, and this time effect differs with the coal size (from centimeter to nanometer size). Results of numerical simulation and on-site tests in the Changgouyu coal mine demonstrated that water injection can effectively soften coal bodies and release or transfer stresses, and the time effect of water injection on rock prevention and control is apparent.
Highlights
Coal mine rockbursts in a coal mine are nonlinear dynamic processes
The findings indicate water injection can change the coal microstructure, which makes it favorable for stress release and rockburst disaster prevention and control
The water injection effectiveness was tested by the electromagnetic radiation
Summary
Coal mine rockbursts in a coal mine are nonlinear dynamic processes. They start with the deformation of coal and rocks caused by mining. The regional hazard prevention method is widely used to prevent rockbursts to eliminate high stress concentrations and weaken the elastic energy accumulation through modifying the properties of coal and rocks Such methods include coal seam blasting [11], coal seam water injection [12], drill hole pressure relief [13] and directional hydraulic water fracturing [14]. Coal seam water injection can change the bursting liability of coal or rock and reduce or eliminate rockburst disasters in the mining field. The. The coal seam water injection method is widely applied on site, but it is not necessarily effective in properties of coal and rock [22] and the parameters of water injection, including the hole spacing, all situations.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
