高水平应力矿岩接触带巷道稳定性分析

Stability analysis of roadways on rock-mineral contact zone under high horizontal stress

井下巷道在通过矿岩接触带时,由于接触带两侧岩性差异会在巷道两端和接触带上产生不同的变形和破坏。以杜达铅锌矿100 m中段矿岩接触带巷道为研究对象,采用Flac3D软件数值模拟和现场巷道收敛变形监测的方法,分析矿岩接触带巷道在未支护情况下的应力分布和变形情况,得出杜达铅锌矿在高水平应力下矿岩接触带巷道的变形和破坏规律。研究结果表明:高水平应力下矿岩接触带巷道形成后的破坏以剪切破坏为主,巷道变形和破坏在顶底板表现较为明显。矿岩接触带上剪切应力集中,使得接触带两侧矿(岩)体的变形存在明显的不对称非协调分布。岩体侧的变形破坏比矿体侧更为明显,且巷道两帮变形小于顶底板变形。研究结果可为类似条件下矿岩接触带巷道的支护提供理论依据。

When underground roadways pass through rock-mineral contact zones,different deformations and fail ures may occur at both ends of the roadways and on the contact zone due to rock differences on both sides of the con tact zone.Taking the 100 m section of the roadways on the rock-mineral contact zone of Duda Lead-Zine Mine as the research subject,numerical simulation using Flac 3D software and on-site convergence deformation monitoring were carried out to analyze the stress distribution and deformation of the roadway in the absence of support.The deformation and failure law of the roadways on the rock-mineral contact zone of Duda Lead-Zinc Mine under high horizontal stress was obtained.The study showed that the failure of the roadways on rock-mineral contact zones under high horizontal stress was mainly shear failure,and the deformation and failure of the roadway were fairly obvious in the roof and floor.The shear stress on the rock-mineral contact zone was concentrated,and there were obvious asymmetrical fluctuations in the deformation of the rock on both sides of the ore body.The deformation and failure of the rock on one side of the contact zone were more obvious than those of the ore body.Moreover,the deformation of the two sides of the roadway was smaller than that of the roof and floor.The research results provide a theoretical reference for the support of similar roadways on rock-mineral contact zones under high horizontal stress.