The Research Of Shen-dong Aeolian Sand Mining Area Of Main Influencing Factors Of Mining Subsidence

Study of mining subsidence is a complex problem of mining damage, for different geological and mining conditions, the surface subsidence rule is different. At present, our country for a focus in the study of theory and practice of mining subsidence area, mainly concentrated in the eastern central plains in the mining and mining thin loose bed, and for shen-dong aeolian sand area of mining subsidence research are rarely involved.By study shen-dong aeolian sand mining area of main influence factors of mining subsidence, can be thick aeolian sand was revealed in theory under the condition of the mining area surface subsidence deformation mechanism and law of mining subsidence and puts forward control measures, for shen-dong mining area coal mining safety and provide reference for ground protection.This article uses the finite difference software FLAC3D numerical simulation analysis, mainly finished the following several aspects work:(1) According to the collection, the geological data of shen-dong aeolian sand mining area, summarizes the main influencing factors of the mining subsidence in the area.(2) According to fill the tower12407fully mechanized coal working face drilling comprehensive histogram, FLAC3D numerical model was constructed; The mining area to collect the sample processing and measured coal and rock physical and mechanical parameters.(3) To analyze the influence of surface movement of the loose bed thickness, mining height,topography,the key stratum location,summarized the subsidence laws are as follows:①Under the condition of invariable in mining depth, alone with the increase of the thickness of the loose bed, the surface of the maximum vertical displacement and the maximum horizontal displacement will increase gradually; Surface subsidence coefficient alse increases gradually; The surface horizontal displacement coefficient decreases, and then reaches a certain degree, are no longer changing.②With the increase of mining height, the surface of the vertical are in linear relationship between the maximum displacement and maximum horizontal displacement; Also increase coefficient of surface subsidence, ground surface level coefficient decreases. ③The lift and slope topography has the following characteristics: the bottom part of the subsidence is positive, the slope slip cause near bottom uplift; In the top part of the sliding surface subsidence caused by negative, namely the slip surface subsidence.④When the key is located in the lower layer, the surface of the maximum subsidence value is greater than the critical layer is located in the upper value of subsidence, damage degree is greater than the same key strata in the superior conditions, therefore, other things equal, the key is located in the upper layer of structure is good for the surface stability.(4) The subsidence control measures are put forward, and the numerical simulation is made on the optimal exploitation scheme: to better control the surface subsidence, ground protection area is not big, should choose to clean mining way; And the local surface protection area is larger, should choose to jump by way of mining; At the same time, should be avoided in the process of mining sequence mining methods.