采空区及上覆岩层空隙率三维分布规律

Distribution law of 3D fracture field of goaf and overlying strata

在构建采场覆岩下沉连续曲面数学模型基础上,理论推导出采空区及上覆岩层三维空隙场分布模型,并通过实际算例验证模型的适用性。研究结果表明:离层带裂隙以"双驼峰"比例耦合形式变化,外围区域呈"凸峰",空隙率大,内部区域呈"凹陷",空隙率小,并且在与工作面平行的截面上存在空隙率竖向变化突变点,随埋深增大截面一侧空隙率升高,另一侧则降低;冒落带空隙率以"铲"状分布,浅部及两巷侧空隙率大,而中部及内部空隙率小。

The 3D fracture field distribution model of goaf and overlying strata was derived on the basis of the continuous surface mathematical model of overlying strata. The applicability of 3D model was verified through practical examples. The overlying strata fissure changes in proportion coupled form of double hump. The porosity in external area is small and convex front-like, while the porosity in the internal region is large and hollow. The junction point of ionosphere porosity exists in the vertical direction, with depth increases the side of the porosity increases, and the other side gets lower. The distribution of porosity appears shovel-like in the Caving zone of the goal. The porosity is large in the periphery of the goaf, but small in the internal range.