Abstract:
In order to solve the coordination problem of filling wall strength and roof load of gob-side entry retaining, in the term of roof structure and weighting characteristics in goaf, failure characteristic is discussed respectively in gob side entry retaining of immediate roof and main roof, thinking that main roof periodic "half OX" failure in stope lateral formed rock block and structure equilibrium process, is key to influence gob-side entry retaining of surrounding rock stability. Hereby a surrounding rock structure model is established to obtain wall load at the beginning and end of roof movement. According to roof motion feature in different occurrence condition, wall load is divided into three mods: first fast and after slow, uniform development, first slow and after fast, in middle stage of roof movement. Wall strength should be more than roof load in any period of roof movement. Thus it ensures to coordinate wall strength with roof movement. Finally validation combining with an engineering case is presented.