倾斜层状围岩变形规律的相似模拟研究

为研究倾斜层状围岩薄矿体在开采过程中上覆岩层的变形破坏规律,以永昌铅锌矿矿体为物理试验模型,通过相似模拟材料试验建立二维地质模型,对在倾斜层状围岩条件下,薄矿体地下开挖后覆岩的变形破坏特征、力学特性和破坏过程进行研究。结果表明,顶板受第一次与第二次开挖影响最大,随着不断地开挖,沿着开挖方向的矿壁不断地变为间隔矿柱,每两次矿体开挖之间水平位移的方向均会发生一次反转;位于矿柱上方的围岩沉降值较小;覆岩水平变形与下沉的方向均指向采空区中心偏下区域;层状岩体易引起弯曲折断破坏;采场覆岩相对下沉增量和水平相对位移增量单调递减。

The analog simulation research on oblique bedded surrounding rock deformation

For the study of inclined thin bedded surrounding rock ore body in the upper strata in mining process regularity of deformation and destruction. Yongchang lead-zinc ore body as a physical model test. Through similar material simulation experiment a two-dimensional geological model is established,To tilt in layered rock mass under the condition of thin orebody of strata after underground excavation deformation and failure characteristics, mechanical characteristics and failure process are studied. Results showed that the roof is influenced by the first and second excavation is the largest,With the unceasing excavation,along the direction of excavation ore wall constantly into interval tiberium spike,and the direction of the horizontal displacement between each two ore body excavation are a reversal will happen. Located in the pillar at the top of the smaller values of the settlement of surrounding rock.Strata horizontal deformation and subsidence are pointing in the direction of the gob area in center offset. Due to poor adhesion between the layers flexural capacity is not strong, the layered rock mass is easy cause bending fracture damage.The relative subsidence increment of overburden rock and level relative displacement increment monotone decreasing.