Study on differentiation support technology of intersection at large cross section cross-cut

Wang Bo; Yang Zhangjie; Yang Yonggang; Yu Dajun

doi:10.13199/j.cnki.cst.2017.02.009

Abstract：In order to solve the support problem of the special section in the mine soft rock roadway under the complicated condition,specially under the early mining influences and late coal pillar long role period,the support difficulties of the driving in front and repair in rear and repeated repair and repeated failure in the large cross section intersection,based on the engineering case of the crosscut intersection gateway in -500 m level track in Xutuan Mine,the theoretical analysis and the numerical simulation method were applied to the related study on the deformation influence factors,deformation law,differentiation support technology and role and the support effect of the low strong surrounding rock in the large cross section intersection gateway.The differentiation support idea,design plan and support technology of the large cross section crosscut intersection was provided in innovation.After the differentiation support plan of the five major zones (expanded reinforce support zone,steadily changed large cross section transition zone,pre-grouting reinforced zone,full cross section shotcreting,bolt,grouting and roof and floor interactive control zone and the roof and sidewall shotcreting,anchoring and grouting and the floor grouting reinforced zone),the completed loading capacity of the support structure and the self loading capacity of the surrounding rock were improved.The max convergence of the two sidewalls within the intersection scope was 102 mm and the max convergence of the roof and floor was 69 mm.Thus the large deformation and strong rheology instability problem of the low strength surrounding rock along the large cross section intersection roadway was effectively controlled.The long period stability of the surrounding rock along the roadway was ensured.