铁矿开采对脖子梁副坝安全运行的影响

马道子铁矿位于潘家口水库脖子梁副坝东侧约160 m,铁矿开采是否会对副坝的安全运行产生影响是一个非常重要的课题。首先,采用三维激光扫描仪对研究区地形进行了大比例尺的测绘,建立了三维地质模型;然后,采用回弹仪、点荷载仪对岩块强度进行了力学测试,同时在井下进行了节理裂隙统计。在此基础上,运用RMR分级系统对围岩质量进行了分级,确定出了围岩的强度指标。其次,运用FLAC-3D对铁矿开采引发的地表移动规律进行了预测研究。最后,采用Visual Modflow对脖子梁副坝渗流场进行了模拟分析。研究成果表明,只要马道子铁矿按照设计要求进行开采,就不会对脖子梁副坝安全运行造成影响。

Effect of iron ore mining on safety of Boziliang auxiliary dam

Madaozi Iron Ore Mine lies on the east of Boziliang auxiliary dam of Panjiakou Reservoir. The distance between the mine and the auxiliary dam is only about 160 m. So it is a very important question for discussion whether mining will affect the safety of the auxiliary dam. A large-scale mapping in the study area was done by 3D laser scanner; and a 3D geological model was established. The strength of rocks was tested with a schmidt hammer and a dot-loading apparatus; and statistics of joints and fractures were carried out under the well. Based on these, rock mass classification was made with RMR-system; and the strength parameters of surrounding rock were determined. The regular pattern of the surface movement causing by iron ore mining was forecast with the FLAC-3D software. Finally, the seepage field of Boziliang auxiliary dam was simulated and analyzed using the Visual Modflow software. The study result indicates it will not affect the safety of Boziliang auxiliary dam as long as the exploitation in Madaozi Iron Ore Mine conforms to design.