Research On The Ground Movement And Deformation Law Of The First Mining Face In The Deep Shaft Mining Of Huge Thick Loose Layer In Banji Coal Mine

The rapid development of social economy,the accelerated industrialization of the world,and the increase of energy use have led to the massive development of energy including coal.The mining of shallow buried coal seams is no longer able to meet the needs of society,and thick loose layers of buried deep coal seams are being vigorously developed.The mining of coal seams has caused many hidden dangers such as geological disasters,which hinder people from living and working in mining areas and endanger the ecological construction of mining areas.There is less research on the surface movement deformation law under the mining of giant thick loose seam,less research on the overtopping range and the method of finding it,and the applicability of the sinkhole estimation method under this geological mining condition is to be tested.The paper is based on the surface movement observation data of the first mining face of Banji coal mine 110801,and the study of the surface movement deformation law of the first mining face of Banji coal mine under deep shaft mining of giant thick loose layer is carried out.(1)The surface movement deformation calculation was carried out using Matlab programming,and the surface movement deformation curves related to subsidence and horizontal movement were plotted for the strike observation line and tendency observation line,and the respective deformation characteristics and deformation trends were analyzed,and the respective maximum and minimum values were explained,and the causes of the anomalous points in the deformation curves were analyzed.(2)Based on the results of the movement deformation calculation,the parameters related to the expected sinking and subsidence within the number of observation periods were solved,and the initiation distance of the first mining face of110801 in Banji coal mine was determined to be 49m;the overtopping influence distance of the first mining face of 110801 during the advance of the surface working face was calculated by using the gray Verhulst model and the three times spline interpolation programming,and its average difference with the measured value was less than 15 m.The influence distance of 100 mm sinking in front of the latest phase of workings was obtained as 230.79 m,and the relationship between the overrun influence distance and the workings position was fitted according to the shape of the curve;the surface sinking velocity curve was plotted and its lag distance was derived;the surface movement time was analyzed using the sinking information from the real-time monitoring station MCORS02,and the active period under the mining of the giant thick loose layer was longer.Finally,the probability integral parameters were obtained to provide initial values for the expected reference of the probability integral.(3)The probability integral method,the probability integral correction model and the Boltzmann function prediction model were used to predict the subsidence of the strike main section,and the applicability of the three types of subsidence prediction methods to the mining of huge thick loose layers in the Panji coal mine was investigated.The results show that the Boltzmann function prediction model has better overall prediction and stronger boundary convergence than the probability integral model;the hyperbolic profile function model has the best boundary fitting effect.Figure[27] Table[9] Reference[119]...