Abstract: According to the characteristics of the semicircle arch roadway of mine straight walls, combining with the anchor net supporting and failure feature of the Ushape retaining instability, some related researched is done by numerical simulation softwares. The research results show that,the weak positons of supporting bearing can be structural reinforcemented by adopting the pretightening force of anchor cable. So, is is good for improving the overall stability and intensity of the supporting bearing.

Key words: Local buckling, Numerical simulation, Structural reinforcement, The semicircle arch o straight wall