超前支承压力影响下破碎顶板变形机制与控制OACSTPCD

To ensure the stability of broken surrounding rock under the influence of advance abutment pressure and the reliability of support system,the 21104 working face of Hulusu Coal Mine is taken as the research background.By means of theoretical calcula-tion,numerical simulation and field measurement,a mechanical model of the elastic foundation beam for the deformation of the su-per front roof is established,the influencing factors of the bending deformation of the roof,the leading bearing pressure and the main controlling factors of the concentration coefficient are determined,and the advance grouting anchor cable reinforcement technology for broken surrounding rock is proposed.The results show that the roof elastic modulus only affects the roof deflection above the roadway,and the side elastic modulus controls the overall bending deformation of the roof.The advanced support pressure and con-centration coefficient show a rapid increase followed by a slow increase trend with the advancement of the working face,and finally tend to stabilize.There is a 35 m high stress area in the grouting anchor cable reinforcement test face,the anchor cable has a high abundance coefficient,the surrounding rock deformation is low(<210 mm),and the roof integrity is strong,which verifies the effect-iveness and feasibility of this technical means.