Research and application of bolt-grouting reinforcement by stages technology in deep soft rock roadway affected by high stress and dynamic pressure

Based on the difficult preventive measure of the floor heave of 8902 air-return gate in a certain colliery,on composite analysis of the forms and reasons of roadway floor heave,we analysis the mechanism of floor drilling,anchoring and grouting,and make a study design of floor drilling,anchoring and grouting technology,also make an remunerative experiment on the spot.It turned out that drilling,anchoring and grouting had significantly reduced the amount of floor heave of roadway,controlled the roadway floor deformation effectively,ensured the safe use of the roadway.