Synergetic principle for roadway stability and its application technique

Abstract：On the basis of the existing support theories and actual support conditions,synergetic support was put forward by introducing the relevant synergetic principle to roadway support design.Synergetic support is to study the systemic synergy which includes supporting system,surrounding rock system,environment system and other subsystems,in order to make the roadway rapidly reach a balanceable and stable system from the non-equilibrium ultimately.Its purpose is to maximize the physical and mechanical performance of supporting members,effectively control the deformation of surrounding rock to achieve the synergetic supporting effect of 1+12.The synergetic supporting technique of rock bolts and anchor cables is mainly to study the prestressed synergy between them and the synergetic effect with other supporting parameters and supporting structures,in order to make rock bolts and anchor cables achieve maximum individual effect and bring about synergetic supporting effect.The results show that high strength rock bolts must be combined with high prestress and the prestress of rock bolts and anchor cables should match each other reasonably.Preloading above 40 kN on rock bolts and 140-160 kN to anchor cables will better the synergy.Preloading more than 60 kN on rock bolts to further enhance the active supporting character of rock bolts,at this time the preload of anchor cables must be 180-200 kN in order to better the synergy.