Research On Goaf Stability Evaluation And Surface Bearing Capacity Of Coal Resources

Coal resources account for the largest proportion of all energy applications.China's coal reserves are abundant,and coal resources have formed a large number of goafs in the development and utilization.With the urbanization process and urban expansion in China,the use of surface land resources in goafs Imminent.In this paper,the outdoor drilling is used to explore the stratum characteristics of the mined-out area and collect the stratum core,and then conduct physical and mechanical tests to test the physical and mechanical parameters of the stratum,verify the data summary formula for calculating the development height of the fault zone and collapsed fault zone in the mined-out area,and establish a study in conjunction with the geological survey The three-dimensional simulation model of the zone,through theoretical analysis,numerical simulation,on-site monitoring,data analysis and other methods,studied the settlement mechanism of the goaf and the surface bearing capacity of the goaf,and completed the following work:(1)Carry out drilling and exploration work,basically find out the development height of the"three belts" of the overlying strata in the exploration area or leave the integrity of coal(rock)pillars,and optimize the calculation formula of the development height of the "three belts" in this area.Then carry out physical and mechanical tests and other test work methods to obtain the physical and mechanical parameters of the top and bottom floors and overlying strata of the mined-out area to prepare for the numerical calculation.(2)Carry out the monitoring of the surface movement and deformation of the mined-out area in a representative area,basically find out the law of the surface movement and deformation of the mined-out area in different sections,and basically determine the remaining deformation of the existing coal-sourced mined-out area.(3)Effectively fuse hydrogeology,engineering geology,geotechnical mechanics,structural analysis and other multi-disciplinary and multi-disciplinary comprehensive research methods to conduct a comprehensive study on the stability of coal mine goafs.Taking excavation as the main factor affecting ground subsidence,establish a large area three-dimensional simulation model to explore the impact of excavation on ground subsidence.Establish a fine geotechnical analysis model of typical mined-out area,combined with the construction process of coal mining in the mined-out area effectively invert verification and reproduce the change law of the mechanical response of the whole process of coal mining,and study the deformation and stability of the geological body in the mining area during the construction process According to the current situation of coal mining,the surface movement and deformation of the mined-out area in the area are analyzed.(4)On the basis of excavation of large-area mining areas,building loads are applied on the surface of the goaf to simulate the impact of the structure on the goaf,study the bearing capacity of the goaf on the surface,and reflect the increased ground of urban development to a certain extent.The effect of load on the stability of the mined-out area provides a reference for the development and utilization of surface land resources in the mined-out area.