Study on stability of gangue mountain in discharging method

In order to explore the influence law of the discharging method on the stability of the meteorite mountain,a method of removing the meteorite that is beneficial to improve the stability of the meteorite mountain is proposed. This paper firstly classifies according to the source of meteorite. Through the experimental test of uniaxial compression mechanics of vermiculite samples,the characteristics of the mechanical properties and the reasons for the characteristics are analyzed. Then the model is established for Lijiahao coal gangue mountain,using the numerical simulation software GeoStudio. The SIGMA/W module and the SLOPE/W module are used for parent-child analysis. The finite element calculation method of the simulation software is used to analyze the stress distribution state inside the meteorite mountain. According to the stress redistribution state,the limit equilibrium method is used to reduce the mechanical parameters. The influence law of coal working face vermiculite on the overall stability of meteorite in different ways of abandonment,and the stability of meteorite in the coal mining face meteorite under different coupling modes and different buried depths Change the law,and finally propose a discharging method that is conducive to the stability of the meteorite. The results show that the mine production process can be divided into coal mining face gangue and driving face gangue according to different sources. The strength of these two types of gangue is different. The strength of coal mining face gangue is obviously weaker than that of driving face gangue. It shows that the average uniaxial compressive strength of the gangue sample of the tunneling face is 1.6 times that of the gangue sample of the coal face; the position of the slope top line is the same after the gangue of the coal face is discharged under different drainage methods,and the gangue is discharged on the section under the same areaconditions,compared with the uniform parameter gangue dump stability coefficient,the flat paving and dumping gangue discharge methods have reduced the stability coefficient by 16.4% and 29.0% respectively. The flat gangue discharge is more conducive to the stability of the gangue hill; When the surface gangue adopts the flat-layed gangue discharge,the change of its buried depth has little effect on the stability of the gangue hill. When the depth is 0,the stability coefficient is 1.56,which is reduced by 7.9%. When the depth is 5 m,the stability coefficient is 1.53,which is reduced by 9.6 %; When the dumping type gangue is used,the change of buried depth has a greater impact on the stability of the gangue hill. When the depth is 0 m,the stability coefficient is 1.09,which is reduced by 35.3%,and when the depth is 5 m,the stability coefficient is 1.07,which is reduced by 36.5%. And the dangerous sliding surface often runs through the gangue layer of coal mining face.