Stability Study Of The Goaf

In recent years,with the development of economic construction in China,the underground mineral resources is consumed continuously,in the exploitation of mineral resources at the same time,left a lot of goaf,the mined-out area along with the advancement of extraction time,gob area is increasing,more and more suffered from the influence of the mined-out area of civil engineering construction,and due to the increase of land for construction,the mined-out area as construction sites,people find ways to use these examples also gradually increasing.Coal mine goaf stability problem is a very complicated problem,mined-out area of geological environment can be regarded as a complex system,its stability is influenced by many factors and constraints,such as the end time,coal thickness,mining depth,the night of rock physical and mechanical properties,geological structures,groundwater,repeating mining,mining and roof management method,and earthquake,etc.Goaf stability analysis of the governance for the mine goaf can have considerable significance.The mined-out area in a timely and effective governance is to ensure that workers' life and the property safety of country or enterprise,can continuous mining is one of the important conditions.Goaf management must understand the mined-out area of the specific conditions of the existence difference,may be produced by one or more method to judge the degree of disaster risk.Only considering all kinds of information,in order to get accurate effective goaf management plan,and as far as possible do priority management the risk degree of large mined-out area,guarantee the safe production in mines.Taking a mine goaf northern shaanxi as an example,using the FLAC3 d numerical analysis method,analyzes the mined-out area of overlying strata subsidence,horizontal displacement and goaf on overlying the construction site.Numerical analysis results showed that the mined-out area of the upper layer is usually a larger displacement,vertical settlement and subsidence uneven,around the settlement from the goaf to wane,goaf center biggest settlement;At the same time different goaf boundary of mined-out area overlying site scope vary,arc boundary is small,large range of line boundary effect.The results provide design basis for goaf ground construction project,has important guiding significance for the similar engineering practice.