Research On Waterproof Method Of Reconstructed Aquiclude In The Coal Seam Floor Of Taer Open-pit Mine

Open-pit coal mines have the advantages of low mining cost,high output rate,and high resource recovery rate,and have been increasingly widely used in coal resource mining.Open pit mines have complex hydrogeological conditions,and there are huge reserves of coal resources threatened by potential water inrush disasters in underground aquifers.Based on the current mining situation of the first mining area of the Thar open-pit mine in Pakistan,this thesis proposes a water hazard prevention plan for the bottom of the "reconstructed aquiclude".An evaluation study was carried out on the slope safety,and the main research results are as follows:(1)Based on the exploration data and investigation reports,the aquifer situation and engineering situation in the first mining area of the Taer open-pit mine were analyzed,the model structure of the reconstructed aquiclude was proposed,and the stress mechanism of the aquiclude was analyzed.Based on the spatial location characteristics and force characteristics of the water layer,the overall and composite structural mechanics models are established respectively.(2)Through the laboratory sample experiment,the similar proportioning scheme of mudstone materials in the reconstructed aquiclude was determined,and the laboratory model test of the structural deformation of the reconstructed aquiclude was carried out,and the conditions of different water pressures and long-term immersion were analyzed.The stress and structural characteristics of the lower floor aquiclude.(3)According to relevant specifications,the water seepage of the aquiclude and the drainage of the sand layer under critical conditions are calculated,and different calculation models are used to check the stability of the aquiclude;the floor with constant and variable weights is vulnerable to water inrush A risk assessment model was used to classify the risk of the floor aquiclude in the first mining area.(4)The instability mechanism of the slope in the fill site was analyzed,and the potential slip mode of the slope was constructed.Using the "Geo Studio" software,three slope calculation models corresponding to the water control schemes of the internal dump site were designed.The overall and local safety factors of the slope were evaluated,and the safety of the slope was evaluated.