关键词: 金矿, 回采顺序, 隔一采一, 踏步式回采, 数值模拟, FLAC^3D

Abstract: The selection of rational excavation sequence may is favor for the underground metal mines to control the geo-stress，to improve excavating conditions and to raise economic benefits.The V^# ore body is excavated by the upward horizontal slice stoping-filling method at Xincheng Gold Mine，and the layout of the stopes is perpendicular to the strike of the ore body.According to the “taking one every the other one” excavation sequence，the stopes are excavated by one-step mining and two-step mining.This kind of mining sequence results in the second stage of excavating supported by the filling body on both sides and their roofs are not so stable.Taking the -680 m section of V^# ore body at Xincheng Gold Mine as the objective，based on the original excavating sequence of “taking one every the other one”，the “stepped excavating” scheme has been put forward.By means of FLAC^3D numerical simulation，the stability of stope under these two schemes are analyzed and compared.The numerical results indicate that，whether using excavating sequence of “taking one every the other one” or the “stepped excavating”，the mining condition of ore-body at middle under support on both sides is poor.In contrast，however，the sequence of “stepped excavating” is better than the sequence of “taking one every the other one” in terms of controlling of the stope deformation and avoiding from a wide range of plastic zone.The research has an important referential significance for similar mines in the design of ore body excavation.

Key words: Gold mine, Excavation sequence, Taking one every the other one, Stepped excavation sequence, Numerical simulation, FLAC^3D