Reasonable Supporting Time Analysis for Large Section Chamber in Deep Well Soft Rock

According to supporting design of Huainan Zhuji Coal Mine kilometer deep main shaft skip loading chamber, we introduce Burger visco plastic model to carry on numerical analysis. According to calculation results of the secondary lining structure stress and surrounding rock deformation under different supporting time, we give reasonable supporting time for chamber. The field monitoring results of lining structure reflect that using secondary lining structure in isokinetic rheological stage can effectively control the surrounding rock deformation and reduce the secondary lining structure stress base on the chamber roof deformation characteristics and after the completion of excavation and primary support in the chamber.