Abstract: By doing numerical analysis and physical tests, combined with orthogonal design, influence extent and law of various factors on transverse railway effect of bolt have been achieved. The result has shown that lithology is the biggest factor on axial stress of bolt, and effects of bolt diameter and friction coefficient increase with the shear shift. Diameter and anchorage angle are major factors on separation, and lithology is the most important factor when the shift is the biggest. Among the factors on strength of jointed rock, lithology comes first, and joint comes second. Other factors are positively correlated with shear force, except for anchorage angle. Based on the influence rules, internal mechanisms have been derived. Advanced laboratory test has shown that the results are in reasonable agreement with those acquired from experiment and the simulation model is suitable for modeling transverse effect. The research achievement has a positive significance on the jointed rock mass stability controlling by bolt and engineering security under the coal mining load.

Key words: discontinuous rock mass, transverse reinforcement, railway effect, anchor, the law of effect