Experimental Study On Seismic Resistance Of Underground Reservoir In Level Coal Seam

As China's primary energy,coal position will not change in the future for a long time.However,the traditional way of mining requires large amounts of water and mine water discharging out not only waste resources,but also pollutes the ground.To address this issue,China's coal mining enterprises proposed and established practice in underground reservoirs,and Shenhua group works with Tsinghua University's water-rock group in green mining research.Building mine underground reservoir gives a way to solve the waste and pollution problems of coal mining.Mine underground reservoirs are built in the coal mined area as underground storage facilities,which are located underground about hundred meters.Strong situ stress and binding effect make the underground reservoirs' environment complex,What is more,mining and earthquakes are also common loads.In this thesis,to address the research about the overall seismic resistance of coal dams in Daliuta horizontal seam mining underground reservoir,there were doing the earthquake simulation experiments,and texted the safety horizontal distance in upper and lower reservoirs.For these two problems,we build four models,which are gravity models,underground reservoir coal pillar dam model,uncoated pillar rock dam model and upper and lower reservoir model.The first three tests the seismic resistance of coal pillar dam,and the last study on the safe distance in the upper and the lower reservoir.During the experiments,the strains in three directions are measured by Strain gage rosettes,and then these values are converted to stresses,thus to shears finally to security index according Moore Coulomb criterion.At last these safety index are used to evaluate the seismic resistance of coal dam and the safety horizontal distance of the upper and lower reservoirs.This thesis is mainly base on experiments.Because the seismic resistance of gravity dam has been adequately studied,thus,it will be a good way to research underground reservoir coal dam by comparing with gravity dam.Through designing no overlying rock pillar dam model,the thesis can study the overburden impact on seismic resistance of coal dam.The underground reservoirs are in two layers.Through designing the upper and lower reservoir model,the thesis can study the safety horizontal distance of the upper and lower reservoirs.This thesis also simulates the four experiments by numerical simulation.The results of the numerical simulation mainly compare the acceleration signal with the experiments in the same measuring point.This comparison verifies the reliability and accuracy of the experiments.The numerical simulation makes it convenient for more conditions research latter.After experiment and numerical simulation,the thesis can conclude that the seismic resistance of underground reservoir coal dam is greater than uncoated coal dam,and the uncoated coal dam is greater than gravity dam.What is more,if the horizontal distance between the upper and lower reservoir is greater than 270 m,the seismic resistance is guaranteed.