Abstract: The original supporting scheme of 26B# stoping roadway of Hongtai Coal Mine can be described as two rows of 18 mm rebar anchors,the length of anchor is 1.6 m,the anchor intervals and anchor row spacing are both 1 m,the floor and two sides of roadway are not supported.Through field investigation and analysis,under the action of mine pressures,fissures and separation phenomenons are existed in the upper of roadway roof,and the convergence between roof and floor of the roadway is significant.In order to ensure roadway stability,the original supporting scheme is optimized,the supporting optimization scheme is proposed.The new scheme can be described as the rebar anchor is used as the supporting method of the complete area of roadway floor,the crushing area of roadway floor can be processed by using anchor cable.In order to determine the suitable arrangement method of anchor and anchor cable and some relative important supporting parameters,the numerical simulation model is established by using FLAC3D software,and the numerical simulation of surrounding rock displacement field,surrounding rock stress field and surrounding rock plastic zone.Based on the above numerical simulation results,the supporting optimization scheme can be determined as three rows anchors are set in roadway floor,the length of anchor is 1.8 m,the anchor intervals and anchor row spacing are both 0.8 m;two anchors and one anchor cable can be used to deal with the crushing area of roadway floor,the anchor intervals and anchor row spacing〖LM〗 are both 0.8 m,the length of anchor cable can be determined based on roadway surrounding rock stability conditions.The supporting optimization scheme of Hongtai Coal Mine proposed in this paper can provide some reliable reference for the roadway supporting of other mines.

Key words: Roadway supporting, Stoping roadway, Anchor supporting, Supporting scheme, Numerical simulation