动态扰动下硬岩矿柱应力演化与地表沉降规律

为研究多次开挖扰动下的矿柱应力和地表沉降变化情况，结合某典型铁矿床物理原型，基于有限元理论，运用Midas/GTS软件建立了3阶段15矿房数值计算模型，对硬岩矿床多次开挖卸荷扰动下的矿柱应力演化特征和地表沉降规律进行了数值分析。结果表明：在水平和垂直方向的多个相邻矿房开挖过程中，应力扰动等级：自身矿房开挖>同水平相邻矿房开挖>下水平相邻和对角矿房开挖>上水平相邻和对角矿房开挖；水平X方向应力集中效应大于水平Y方向和垂直Z方向。随着矿房的开挖，矿体上盘地表区域发生了沉降，下盘地表区域发生了隆起，第一水平开挖地表位移变化区域沿矿体走向扩展，第二、三水平开挖地表位移变化区域增大区域不明显，沉降敏感区域位移值呈增长趋势。

Stress Evolution and Surface Subsidence Laws of Hard Rock Pillars under Dynamic Disturbance

To investigate stress evolution and surface subsidence of pillars under repeatedly excavation and disturbance，combining with physical prototypes of a typical iron deposit，a numerical model of 3 stages and 15 stopes is built based on finite element theory and using Midas/GTS software.The stress evolution and surface subsidence of pillars under repeatedly excavation and unloading disturbance are numerically simulated.The results show that during the excavation of adjacent stopes in horizontal and vertical directions，the rating of stress disturbance shows as stope itself excavation﹥adjacent stope excavation at the same level﹥adjacent stope and diagonal stope excavation at the lower level﹥adjacent and diagonal stope excavation at the upper level.Horizontal X direction stress concentration is greater than the horizontal Y direction and the vertical Z direction.With the excavation of stope，the subsidence at the upper panel of orebody occurred and the uplift at lower panel occurred.The surface displacement area at first horizontal excavation extends along the orebody.The surface displacement area at second and third horizontal excavation has no obvious increase，while the sensitive subsidence areas tends to grow.