论文部分内容阅读
随着矿山开采的进行,南芬露天铁矿形成高差约456 m,整体坡度达46°的高陡边坡,多次出现张裂、滑塌等地质灾害。首先,对滑坡区域工程地质条件进行分析,得出滑坡特征与机理。然后,进行基于MSARMA法的边坡稳定性定量评价与敏感性分析,建立排水条件下边坡稳定性分析方法,并验证了排水有效性,利用FLAC~(3D)进行边坡扩帮工程稳定性模拟。最后,提出采用坡体排水与预裂爆破技术,同时构建基于滑动力远程实时监测预警系统的滑坡体监测网。研究结果表明:滑体在降雨与扩帮工程影响下会再次滑移,采用预裂爆破技术与排水措施有效提高边坡稳定性,20个监测点组成的滑坡体监测网成功实现了南芬下盘边坡稳态实时监控与预测预报。
With the progress of mining, the Nanfen open-pit iron mine has formed steep slopes with a height difference of about 456 m and an overall slope of 46 °. Many geological disasters such as cracks and landslides have occurred. First, the engineering geological conditions of the landslide area are analyzed, and the landslide characteristics and mechanism are obtained. Then, the quantitative evaluation and sensitivity analysis of slope stability based on MSARMA method are carried out. The slope stability analysis method under drainage condition is established, and the validity of drainage is verified. The stability simulation of slope expansion project by FLAC ~ (3D) . Finally, the slope drainage and pre-cracking blasting technology is proposed, and a landslide monitoring network based on sliding force remote real-time monitoring and early warning system is constructed. The results show that the sliding body slips again under the influence of rainfall and expansion project, and the presplitting blasting technology and drainage measures can effectively improve the slope stability. The landslide monitoring network composed of 20 monitoring points succeeded in achieving the success of the south slope Steady state monitoring and prediction of plate slope.