Mechanism analysis and control technology of surrounding rock failure in deep soft rock roadway
• Roadways deformation with deep soft surrounding rock is serious and difficult to control. • The full-section layer-double arch synergy reinforcement technology was proposed. • The mechanism of layer-double arch synergy reinforcement technology was shown. • The deep soft rock roadway can be effectively controlled by the composite support scheme. In order to research the surrounding rock control technology of deep soft rock roadway, the air returning cross-cut of Xinhu Coal Mine in Bozhou City was taken as an example to study the failure characteristics, roadway deformation mechanism and surrounding rock repair technology. Before the surrounding rock of the roadway is repaired, the roof of the roadway sink seriously, the floor heave is obvious, and the surrounding rock strength is low, showing characteristics of soft rock. Therefore, The composite support method of “ shotcreting + grouting anchor bolt + anchor bolt + grouting anchor cable + anchor cable ” is proposed by the full-section layer-double arch synergy reinforcement technology. The technical parameters of the scheme are determined by theoretical analysis, engineering analogy and engineering practice. The numerical simulation is adopted to verify the rationality of the layer-double arch collaborative reinforcement technology. And, the on-site monitoring results show that the deep soft rock roadway can be effectively controlled by the composite support scheme, which can provide reference value for other similar engineering.