Design method of synergetic support for coal roadway

This paper presents the concept of synergetic support with a comprehensive design method based on the existing support theories and engineering practices. The synergetic support is different from the common combined support method as it can fully mobilize all the components to bring active support and get the effect of 1＋1≥2. The numerical simulation was used to study the pre-stress cooperation between bolts and cables which is the main part of the synergetic design method. Extensive simulations were made on the performance of the individual and synergetic bolts and cables with different pre-stress forces. The simulation results show that, even high-strength bolts can’t offer active support without any pre-stress, therefore high-strength bolts should work with prestress. The proper match between prestress bolts and cables can fully mobilize their individual performances and eventually get to the synergetic support.