Numerical Analysis Of No.2 Mine Coal Gangue Seismic Performance And Stability

Shanxi is the core province of China’s coal mining industry.It produced large amounts of mines,at the same time,it also produced corresponding by-products,coal gangue.The coal gangue is a kind of mining solid that produced in mining process.The current comprehensive utilization rate is still very low.In addition to be used in subgrade,power generation,building materials manufacturing,the main way is pile up nearby and reinforce become artificial deposit.However,these accumulations do not take into account the factors such as earthquakes and other geological disasters.If these gangue without reinforcement,the occurrence of spontaneous combustion,rainstorm,earthquake,often make these accumulations unstable.Pose a threat to buildings and people in the gangue influence area.This paper compared the 19 gangues in Yangquan mining area,and picked the relatively more dangerous gangue as a typical example,using the finite element dynamic analysis of LS-DYNA software for numerical analysis.By comparing and analyzing the seismic waves with different incident angles and different magnitudes,the main conclusions are obtained as follows:(1)Displacement distribution:The slope displacement and stress(y direction and z direction)are relatively larger,and the displacement and stress are relatively smaller at the bottom of slope;and the displacement and stress reaches the maximum at the top of the gangue to free surface,larger values of resultant displacement located range in the middle of the gangue to the top surface.(2)Displacement shape:Overall,the stress,strain and the displacement of coal gangue generated by its own gravity in the piling construction process(The first 10s load is gravity loading),and the displacement form is move along both vertical and free surface directions.(3)The stress distribution:By effective stress chart can be seen,the maximum of effective stress located nearby the free surface of the coal gangue.distance of gangue body near the free surface.(4)Influence of earthquake magnitude:When the seismic intensity is 7-8 grade(the earthquake load is 0.1g～0.2g),The earthquake has a relatively less influence on the displacement shape of the whole coal gangue,but has a great influence on stress distribution.(5)Influence of seismic incident angle:For the target coal gangue,the most dangerous earthquake incident angle is the y direction.