芒硝水平连通井开采稳定性模拟研究

Study on Numerical Simulation of the Stability of Thenardite Level Connected Well Mining

根据淮安赵集矿区芒硝矿层的地质特点,顶板保护是进行水溶开采的难点和主要问题。针对矿区芒硝水平连通井开采时的溶腔形状特征,运用FALC3D模拟不同开采工艺下,圆管状和长方体两种水平溶腔在不同尺寸条件下的围岩应力、变形和屈服破坏范围。结果表明:圆管状水平溶腔直径小于8m,长方体溶腔纵向尺寸为10m、横向尺寸小于30m时,硝层顶板处于稳定状态,不会因跨塌而使硝层上部的盐岩暴露,以及由此引起的硝水含NaCl量不断上升的情况。

According to the geological characteristics of thenardite seam at Huai＇an ZhaoJi mining area, the difficulty and main problem is roof protection during water solution mining. Aiming at dissolved cavity shape of thenardite level connected well mining, the stress, deformation and yield area of two kinds of cavity shape （cylinder and cuboid） in different size under different mining process were analyzed on FLAC3Dnumerical simulation. The results show that when cylindrical level cavity had diameter less than 8 m, or cuboid level cavity had a longitudinal dimension less than 10 m and lateral dimension less than 30 m, the roof of thenardite seam was stable, not leading to the salt rock exposure and the increase of NaCl content in thenardite solution.