Numerical Simulation of Effect of Horizontal Stresses at Different Levels on Stability of Roadways

Tectonic stress is one of the important factors affecting the stability of surrounding rock of roadway.Stability and damage characters of bolted and unsupported roadways are studied by means of physical and numerical simulation tests at different levels of the horizontal stress.Roof failure and floor heave are well reflected by physical tests and plastic zone and stress distribution are revealed by numerical tests.The tests shows that the acute trends of horizontal stress migrate from shallow zone to deep zone,resulting in heave,fold damage of floor,shear deformation,and wedge shape failure in roof.Damage zone in roof and floor is greater than that of the two sides of the wall.Therefore,roof and floor are the important zones to surrounding rock pressure control.Primary support with bolt,mesh wire,and anchor cable coorporated with secondary support with rectangular ring U-steel support is one of the effective means to support of roadways on the condition of high horizontal stress.