Asymmetric deformation characteristics and support scheme design of the surrounding rock in deep roadway

Aiming at the asymmetric deformation of the surrounding rock in the deep roadway, five typical influencing factors of asymmetric deformation have selected: dip angle, buried depth, lithology, lateral pressure coefficient ( λ ), and height-width ratio ( R dw ). Taking the surface displacement of the surrounding rock as the measurement index, a method of monitoring and recording the deformation of the full-section node of the roadway has proposed to investigate the surface deformation law of the full-section surrounding rock of the roadway. Based on 25 sets of orthogonal tests, the asymmetric distribution characteristics of surrounding rock deformation under single factor and multiple factors were studied, respectively. The full cross-sectional distribution characteristics of surrounding rock deformation and the main influencing factors of the asymmetric distribution of deformation have got. The most remarkable asymmetric deformation occurs when the dip angle is 45°. λ and R dw significantly influence the asymmetry of the deformation. The coupling relationship between influencing factors has discussed. Based on the level of influencing factors, we briefly gave the prediction of asymmetric deformation of the surrounding rock of the roadway. Closed support measures can significantly reduce the asymmetry of the surrounding rock surface deformation. Combined with the design and optimization of the roadway support scheme, the asymmetric deformation of the surrounding rock has been controlled. This research can provide references for the understanding of the failure characteristics of the surrounding rock in deep inclined formations and the design of deformation control and support schemes.