Stability analysis of support structure of cutting roof with argillaceous cemented sandstone roof

Abstract

Taking the condition of mud-cemented sandstone encountered in the 207 working face of Wanli No.1 Mine as the background, based on the mechanical theory analysis and field practice, the engineering safety problems of the stability of the open-cut roof support structure of mud-cemented sandstone are analyzed, and the suspension bearing stability of the open-cut roof anchor cable is analyzed based on the layered beam structure model. The analysis shows that the mud-cemented sandstone roof presents the characteristics of poor interlayer bonding force, which is prone to dislocation and separation of layers. Roof bolt anchoring support can inhibit the dislocation between layers, and anchor cable suspension can provide reliable support reaction force and reduce the span of the roof, and play a role in enhancing the stability of the roof anchor solid. Combined with the field conditions, the support strategy of “pre-stressed steel bolt + steel mesh + anchor cable + steel belt + roof drainage” was put forward. The field engineering practice shows that the roof control effect of open-cut roadway is good and meets the requirements of safety production.

Keywords

• argillaceous cemented sandstone
• cutting roadway
• anchor cable suspension
• roadway support
• support structure