大林硫铁矿副斜井穿溶洞施工关键技术研究

Research on Key Construction Technology of Auxiliary Inclined Shaft Through Karst Cave in Dalin Pyrite Mine

针对岩溶地质条件下矿山开采易塌陷的难题,以贵州省湄潭县大林硫铁矿副斜井穿溶洞为例,研究副斜井穿溶洞施工关键技术措施。通过FLAC3D数值模拟,对副斜井穿溶洞段的稳定性进行分析。结果表明,当承重墙间距为5.6 m时,承重墙上部实心水泥砖墙沿承重墙方向约1 m范围内出现贯通;当承重墙间距为3.0 m时,承重墙上部实心水泥砖墙沿承重墙方向未出现贯通。承重墙间距为3.0 m时,现场监测得到溶洞顶板最大垂直位移约为50 mm。设计间距3.0 m实心水泥砖结构承重墙能满足副斜井过溶洞段施工的安全要求。

Aiming at the problem of easy collapse in mining under karst geological conditions,taking the auxiliary inclined shaft of Dalin pyrite mine in Meitan County of Guizhou Province as an example,the key technical measures for the construction of auxiliary inclined shaft through karst cave are studied.Through FLAC3D numerical simulation,the stability of auxiliary inclined shaft through cave section is analyzed.The results show that when the spacing of the bearing wall is 5.6 m,the solid cement brick wall in the upper part of the bearing wall is penetrated in the direction of about 1 m.When the spacing of the bearing wall is 3.0 m,the solid cement brick wall in the upper part of the bearing wall does not penetrate along the direction of the bearing wall.When the bearing wall spacing is 3.0 m,the maximum vertical displacement of cave roof is about 50 mm by field monitoring.The design spacing of 3.0 m solid cement brick structure bearing wall can meet the safety requirements of auxiliary inclined shaft crossing karst cave section construction.