Research On The Key Techiques Of Extraction To West Open-pit Coal Mine Landslide Ares In Ping Zhuang

Landslide is one of the biggest potential geological disasters in the process of coal mining. The occurrence of landslide will cause all or partial coal production disruptions, which may incur a certain degree of economic loss to open-pit mines. Therefore, how to safely and efficiently clean landslides based on the present engineering geological condition as well as when to bring about the constant coal mining and coal production as soon as possible are a prerequisite for reducing the loss of opencast mines.The research background of this paper is based on the landslide in Pingzhuang west open-pit coal mine south mining district II on April17,2013. We have combined previous research results with simulation techniques such as field survey, data statistics, theoretical analysis and FLAC3D, etc. to make a research about key technology used in Landslide areas. As a result, we have put forward the reasonable coal mining scheme for landslide areas. The main work and research results of this thesis are as follows:（1）The paperhas based on which the situation of open-pit mine after a3D geological model before and after landslide, taking SMCAD software as a platform. All of these has laid a solid foundation for the operation of the subsequent section extraction, the volume of the landslide mass, calculation of cleaning quantity based on3D geological model.（2）Landslide is induced by many complex and uncertain factors. In this paper, comprehensive factors are analyzed and109days’ monitoring data in the landslide area. It presents the evolution mechanism of landslide formation.（3）According to strength reduction theory, an inversion is carried out about the rock and soil physical and mechanical parameters in the landslide area so as to determine Cohesion and internal friction Angle respectively, the original laboratory test of cohesion and internal friction Angle of0.476and0.952times.（4）Based on the limit equilibrium theory, we have analyzed the stability safety factor by using geo-slope software and we have also made sure that roof above the landslide area is defined by28°and the lower recovery by60°.（5）The landslide area which is using FLAC3D mining process is simulated; and the simulation results reveal that he disturbance effect on slope in the process of extraction ways; Stability of simulation calculation result fits in with the limit equilibrium method, and prove that limit equilibrium method is verified the reliability of the final form of the slope.（6）Based on the analysis of the above results and the space form of slope slidezone of extraction process, this paper has proposed the safety protection measures for the slope rock mass displacement monitoring combined with internal drainage pressure.