Research On Landslide Disaster After Haizhou Opencast Mine Closure

The exploitation of mineral resources has brought enormous economic and social benefits to mankind and society. Fuxin Haizhou open-pit coal mine is a large open-pit mine in China and even in the world, However,there are still problems like landslide. This paper mainly investigated the Haizhou mine and the surrounding topography, vegetation, climate and surface runoff,used3S techonology to acquire these factors and landslide data, analysed the generation mechanism of these factors to landslide, combined with principal component analysis method to analyze the influence of various factors on landslide and the proportion of these factors to the formation and result of landslide, used the slope monitoring technology to realize the dynamic monitoring of the mine. The main research contents are as follows:(1) The vegetation information extraction in mining area. In the field investigation of surrounding vegetation in different times and different seasons,combined with remote sensing image with continuous time,based on the vegetation spectral characteristics,using the normalized difference vegetation index, got the calculation of open-pit mine vegetation coverage in different period with ENVI software,extracted the vegetation information of landslide impact.(2)Analysis of climate factors in mining area.Information of Temperature, hail and rain provided by the meteorological department of Haizhou mining area, making the annual average temperature change curve, precipitation scale and Hail Distribution table. Calculation and analysis of the effects of climate trends of temperature and precipitation, hail to Haizhou mine landslide using a linear equation and the two curve equation.This research focuses on the effects of climatic factors on landslide in different seasons, find out the changes law of climate factors and the landslide.(3) Surface runoff factor analysis.Via materials provided by the meteorological department and the Department of water resources and according to the surface runoff calculation formula to calculate the Haizhou open-pit mine average annual surface runoff.according to the actual situation of Haizhou open-pit mine,this thesis got the surface runoff by the depth of surface runoff and the product of the drainage area.then make use of the runoff to analyse the influence to landslide.(4) Study on the terrain factor. According to the Haizhou mining area of large scale topographic map, the thesis extracted the mining area terrain factor, and this thesis mainly extracted the parameters of slope and aspect.These parameters can reflect mine surface condition, through the investigation and analysis of the landslide occurrence and mining area, this thesis found out the influence of topography on the mine slope, and analysed the intrinsic link of topographical factors and landslide occurrence.(5) Analysis of influenced factors of landslide disaster. Through the preliminary investigation and information extraction of climate, vegetation, surface runoff, topographic factors, using principal components to analyse the contribution of various factors on landslide hazard rate,this thesis pointed out how much influence of various factors to landslide.(6) The side slope monitoring technology and management program, this thesis realized dynamic monitoring in Haizhou opencast coal mine and its surrounding environment by using3S method, according to the monitoring data in real time to reflect changes in the side slope, and according to the actual situation of mine to make rational treatment scheme to prevent disaster.