Risk Assessment of Typical Urban Mine Geological Disasters in Guizhou Province

  Objectives  Due to the exploitation of many mineral resources and the unique geological environment, Guizhou Province has become one of the most developed places of mine geological disasters, which has the characteristics of wide distribution, significant influence, and prominent potential hazards. It has threatened the life and property safety in the mining area and caused great damage to the geological environment seriously. An effective risk assessment model of mine geological disasters needs to be established urgently.

  Methods  The study area is Panguan Town, Guizhou Province. Based on the detailed investigation of mine geological disasters, the risk assessment model of mine geological disasters is established. Slope, aspect, elevation, curvature, human engineering activities, lithology, distance to fault and distance to mine goaf are selected as the evaluation indexes to construct susceptibility assessment model. Combined with the maximum daily rainfall in a year of different frequencies (10%, 5%, 2%, 1%), the hazard assessment method of mine geological disasters under different rainfall probabilities is proposed. According to the distribution characteristics of different land utilization types, a vulnerability model is set up. Based on the hazard of mine geological disasters and vulnerability of different land utilization types, the risk assessment model of mine geological disasters is constructed.

  Results  The results show that under different rainfall frequencies, 80.55% of the study area remains low risk. The regional risk level of 19.29% increases with the decrease of rainfall frequency. 0.16% of the study area is always at high risk, and measures should be taken immediately, such as monitoring, early warning, engineering prevention and emergency risk avoidance.

  Conclusions  The risk assessment of geological disasters is a fundamental work about geological disasters, and it is indispensable to make the emergency plan of geological disasters. It is preliminarily proposed combined with the characteristics of mine geological disasters, which provided a scientific basis for the prevention of mine geological disasters.