动态扰动下硬岩矿柱破裂失稳演化特征试验

发布时间：2018-06-01 16:00

本文选题：岩石力学 + 矿柱　；参考：《岩石力学与工程学报》2017年S2期

【摘要】：为揭示多次开挖扰动下硬岩矿柱破裂失稳演化规律,以典型铁矿床为物理原型,运用VIC 3D非接触全场应变测量设备、应力与声发射监测系统,开展大尺度二维相似物理模拟试验。研究结果表明,矿柱在水平和垂直相邻矿房开挖过程中会发生多重叠加损伤,第一水平矿房间柱和中间矿房顶柱的损伤破坏严重,力学特性劣化程度高。在分析矿柱损伤、大变形、失稳垮塌等不同阶段演化特征的基础上,基于普氏压力拱理论,建立多水平矿房开挖矿柱失稳演化模型。矿房开挖初期矿柱处于低损伤阶段,属于稳定间歇期;随着矿柱损伤加重,导致矿柱失稳,顶板冒落,进入破坏突发期。矿柱损伤与失稳是引起空区垮塌的关键因素,应运用位移、声发射和应力等监测手段对损伤严重区域进行监测,在进入破坏期前采取有效的控制措施。
[Abstract]:In order to reveal the evolution law of hard rock pillar rupture instability under repeated excavation disturbance, taking typical iron ore deposit as physical prototype, using VIC 3D non-contact full-field strain measuring equipment, stress and acoustic emission monitoring system. A large scale two-dimensional similar physical simulation experiment was carried out. The results show that multiple superposition damage will occur in the excavation of the vertical and horizontal adjacent ore houses, and the damage of the first horizontal ore room column and the roof pillar of the intermediate mine is serious, and the mechanical properties of the pillar are degraded to a high degree. On the basis of analyzing the evolution characteristics of pillar damage, large deformation and unstable collapse, based on the theory of Pressure-Arch, the evolution model of pillar instability in multi-level mining house excavation is established. At the initial stage of mine house excavation, the pillar is in the stage of low damage, which belongs to the stable intermission period; with the increase of the damage of the pillar, the pillar is unstable, the roof falls, and enters the sudden period of destruction. Pillar damage and instability are the key factors to cause collapse of hollow area. Displacement, acoustic emission and stress should be used to monitor the damaged area, and effective control measures should be taken before entering the failure period.
【作者单位】：华北理工大学矿业工程学院;华北理工大学河北省矿业开发与安全技术重点实验室;
【基金】：国家自然科学基金资助项目(51374087,51404086) 河北省自然科学基金资助项目(E2014209093)~~
【分类号】：TD32

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