基于三维数值模拟和切线角理论的露天煤矿滑坡灾害预防技术

Prevention technology for landslide disasters in open-pit coal mines based on 3D numerical simulation and tangent angle theory

露天煤矿软岩边坡变形复杂,滑坡危险性大,为了有效预防边坡滑坡灾害,提出了一种三维数值模拟和切线角理论相结合的滑坡灾害预防技术。该技术研究过程为基于大尺度三维数值模拟在空间上找到潜在变形体,利用蠕变曲线切线角理论计算,建立了不同类型边坡雷达预警阈值划分标准,并对潜在重点变形区域进行时间尺度的全天候监测。将该技术应用于霍林河煤田二号露天采区边坡的滑坡灾害预防中,取得很好的效果。通过数值模拟技术发现,采区南帮开挖区域附近边坡存在潜在变形体,有滑坡风险;再结合切线角理论计算得到的边坡雷达监测阈值提前发出预警信息,得到的边坡雷达监测变形区域与三维数值模拟得到的潜在变形区域基本一致,成功预警了边坡变形的发生,保障了露天煤矿的安全生产。

The deformation of soft rock slopes in open-pit coal mines is complex,and the risk of landslides is high.In order to effectively prevent landslide disasters,a landslide disaster prevention technology combining 3D numerical simulation and tangent angle theory was proposed.The research process of this technology was based on large-scale 3D numerical simulation to find potential deformation bodies in space,and different types of slope radar warning threshold division standards were established by using the tangent angle theory of creep curves,and all-weather monitoring was conducted for potential key deformation areas at a time scale.The application of this technology in the prevention of landslide disasters in the slope of the No.2 open-pit mining area of Huolinhe coalfield had achieved good results.Through numerical simulation technology,it was found that there was a potential deformation body on the slope near the excavation area of the southern slope of the mining area,which posed a risk of landslides.Combined with the tangent angle theory,the slope radar monitoring threshold was calculated to issue early warning information.The deformation area monitored by the slope radar was basically consistent with the potential deformation area obtained from 3D numerical simulation,successfully warning the occurrence of slope deformation and ensuring the safety production of open-pit coal mines.