Calculation and test analysis on stress of surrounding rock in mine roadway with mine pressure bump occurred by dynamic load

Based on a mine pressure bump occurred by the dynamic load would be the static load and dynamic load joint role,a calculation formula of the surrounding rock stress in a circular roadway under the static load and dynamic load joint role was derived. A dynamic and static complex load was conducted on the gypsum model wit h boreholes. A mine pressure bump process occurred by the dynamic load was simulated. An image collection system was applied to real time shoot the mine pressure bu mp process phenomenon caused by the dynamic load and the data collection system was applied to real time collect stress data near borehole mouth. The test showed tha t the mine pressure bump occurred by the dynamic load would pass four stages of the cracking produced,cracking expansion,utting spalling and large area failure of the「 oadway. The comparison between the test and calculation results showed that the real measured value of the stress test at the borehole mouth was the same to the theoret ical calculation. Thus the calculation method could be applied to the estimation of the surrounding rock stress of the gateway with mine pressure bump and could provide th e theoretical basis to the site pressure bump prevention support design.