Study on reasonable excavation sequence of complex bended roadway intersection of pit bottom in coal mine .

In order to reveal the law of complex bended roadway intersection influenced by excavation sequence and to find the reasonableexcavation sequence,the e xcavation sequence of complex bended roadway intersection was analyzed using FLAC3 Dnumerical simulationsoftware. The results showed that the plastic zones of inter section were affected by excavation sequence relatively obvious,the plastic zonescaused by plan 2 and 5 excavation sequence less than the others. While the surrounding rock deformation and vertical stress of intersectionswere affected by excavation sequence was not obvious,it mainly embodies that the asymmetry of roof deformation and t he difference of road-way's sides displacement with the excavation sequence changing. Therefore,the balance unloading method should be selected when exca-vating the complex bended roadway intersection and the conditions permit,avoid excavation along direction from branch roadway to mainroadway and superposition effect comes fro m non-simultaneous excavation to improve the stability of roadway intersection and insure safetyand high effective product of mine.