Research On Rules Of Surface Movement And Deformation Under Fully Mechanized Caving Mining In Linyou Mining Area

Linyou mining area is a large-scale development coal base after Binchang mining area in Shaanxi province.The mining area surface is gully and hilly for landform,coal seam buried depth,mining thickness,and the existence of thick and hard rock overburden which plays a controlling role on the surface deformation.When a large scale fully mechanized caving mining occurs in this mining area,the overlying rock structure will be destroyed,which may cause strong rock pressure and landslide in the surface gully region.Therefore,to carry out the Linyou mining caving mining surface deformation study has important significance to achieve safe green and efficient development of Linyou mining area.This paper takes the first panel of 3# coal in Linyou Guojiahe coal mining area as the research object,through analysising the 1303 and 1305 working face of the deformation of surface movement observation data that indicates: After the completion of single face mining,surface subsidence is small,subsidence coefficient is 0.140,but the local area of gully surface subsidence is large;When the two working faces are over,the subsidence coefficient is only 0.254.In view of this phenomenon,similar simulation of Guo Jiahe coal caving mining overburden movement law of material,physics simulation and numerical studies show that:(1)High thick and hard rock of the Guojiahe mine overburden is the key layer in the study area;(2)The coal pillar plays a supporting role of the overburden,after two mining working faces are over,overlying strata form the continuously arch structure under the effect of coal pillar,which plays an important role in controlling the migration of overlying strata;(3)The key stratum is high thick and hard rock,The overburden failure did not reach the key stratum,the key layer was located in the bending zone,which suppressed the surface subsidence;(4)The reasons for the smaller subsidence coefficient under the condition of near full mining are revealed;(5)The application of computer simulation and inversion of the slope stability in gully region to conduct a comprehensive analysis is given the reason for the increase of the surface subsidence coefficient in the local gully region: due to the poor stability of the slope,there will be a certain amount of slip under the influence of mining,resulting in a small coefficient of subsidence.Research results not only provide a scientific basis for the research on deformation law of surface movement for the mining of the coal mine Linyou,mining ground buildings protection,prevention of landslide surface gully area occurred and the underground strong mine pressure control has certain guiding value.