Research On Failure Of Goaf Under The Condition Of Surrounding Rocks With Slab-rents Structure

In the process of underground mining of mineral resources,a large number of goafs are left behind.The goaf under the condition of surrounding rocks with slab-rents structure,with the increase of exposure time,in the continuous interaction of various factors,its state of goaf surrounding rock continuous dynamic evolution in time and space,resulting in empty area development from stable state to unstable direction,and caused large-scale engineering geological disasters.A large number of goafs is the important dangerous source of mine safety production,which is under the condition of surrounding rocks with slab-rents structure.Therefore,it is of great significance to study the stability of goaf under the condition of surrounding rocks with slab-rents structure.A large metal mine underground mining engineering as the research background,the rock mechanics and structural mechanics theory,with numerical simulation,to study the stability of goaf under the condition of surrounding rocks with slab-rents structure,and puts forward the technical measures of goaf stability control.The main work and research results are as follows:(1)Based on the investigation and study of a large metal mine,the basic situation of the mine is understood,and the environment of the goaf and the situation of the disaster in the goaf are obtained.The internal and external factors affecting the stability of the goaf system were analyzed.(2)The mechanical analysis of the slab-rents structure is carried out,and the calculation formula of the safety factor of the goaf under the condition of surrounding rocks with slab-rents structure is presented.The calculation method is used to analyze the goaf of the mine KT5,and the influence of the goaf specifications and the inclination of the slate on the stability of goaf is studied.The results show that the small size and regular space is stab le,and the stability of goaf is the best under the condition of the steep dip slab-rents structure.(3)Based on the analysis of the stability of goaf group,the stable state of the element is classified,and the method of weight contribution identificatio n of the "short board" unit of the goaf group is proposed.By deducing the relation between goaf group elements damage and goaf group structure modal parameters,according to the influence of the damage index structure of goaf group and the unit weight of each unit,analysis on the stability of the system of the contribution rate,identify the goaf group sub stable "short board",which is under the condition of the steep dip slab-rents structure.(4)Based on analysis of the stability of goaf and goaf group,the measures of stability control were put forward,the effect of reasonable stope layout and reinforcement measures were studied.