Study on risk assessment and adaptability evaluation of regional geological hazards in the northern part of goaf in Fushun west surface mine

Based on the analysis of the data of geological structure, hydrology and artificial engineering in the northern part of goaf in Fushun west surface mine, the main types of geological hazard in the study area, such as toppling-location sliding deformation, toppling sliding deformation, subsidence sliding deformation, landslide and ground fissure, are defined.On this basis, combined with the importance factor of surface structures, it is considered that the controlling factors of geological hazards in the study area or adjacent area are geological background condition factor, artificial engineering background factor, stability factor of geological body at this stage and importance factor of surface influence. The corresponding factor value is assigned according to the risk of each factor, thus providing the basic conditions for modeling and quantitative analysis. Based on the weight distribution and the criterion factors of geological hazards, the risk assessment model of geological hazards is established, and the weight factors are determined by principal component analysis. According to the field survey results of 33 geological bodies in the study area, the risk assessment(Z) standard of geological hazards in the study area is established, that is, when Z ≤ 2.1, the risk of geological hazards is small; when 2.1< Z ≤ 3.2, the risk of geological hazards is medium; when Z> 3.2, the risk of geological hazards is high. According to the geological hazard risk assessment standard, the regional geological hazard risk assessment is carried out in the study area. The evaluation results show that most areas of the first oil plant and the south central part of the power plant are of high risk of geological hazards. It is necessary to reduce the impact of the hazards through monitoring, grouting, internal drainage and other ways; at present, the area around the cement factory belongs to the safe area, only the corresponding monitoring measures need to be taken.