新城金矿V~#矿体-680m中段踏步式回采研究

Stepped Excavation Sequence for the-680 m Section of V~# Ore Body in Xincheng Gold Mine

回采顺序的合理选择有助于地下金属矿山控制地压活动、改善回采条件以及提高经济效益。新城金矿V#矿体采用上向水平分层充填法回采,采场垂直矿体走向布置并按照"隔一采一"顺序分为一步回采和二步回采,这种回采顺序导致二步采场两侧均为充填体支撑,顶板条件较差。本研究以新城金矿V#矿体-680 m中段为研究对象,基于原有的"隔一采一"回采顺序提出"踏步式回采"方案,通过FLAC3D软件模拟分析、比较2种方案对采场岩体稳定性的影响。数值模拟结果表明,无论采用"隔一采一"还是"踏步式回采"方案,在两侧为充填体支撑的情况下,中间矿体的回采条件均较差,但相比而言,"踏步式回采"在控制顶板变形、避免产生大范围塑性区方面优于"隔一采一"方案。本研究成果对类似矿山的矿体回采设计有重要的借鉴意义。

The selection of rational excavation sequence may is favor for the underground metal mines to control the geostress,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 twostep 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 FLAC3D 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.