Study On Water Bursting Prediction Of Coal Mine Floor Based On Five Graph-Double Coefficient Method And Vulnerability Index Method

With the deepening of the depth of excavation,geological and hydrogeological conditions are more complex,the water pressure is also growing in the mining process,mining under high pressure has becomed the main way of deep coal resource development,The threat from high pressure karstic water at the bottom of coal seam is increasingly serious.Once the water damage accident occurs,it will cause huge economic losses to the country and the coal mine,and has a serious negative impact on the society,and because the accident occurred in the underground,it is difficult to carry out effective and effective rescue work,at the same time will destroy the regional water The distribution of resources and the local environment has a huge impact,so the risk of floor water inrush Evaluation of the safety of coal production is of great significance.In this paper,Wang xingzhuang coal mine is used as an example to evaluate the water inrush risk of L1-4 limestone aquifer in the lower section of Taiyuan Formation in the second coal seam by using the five graph double coefficient method and AHP type vulnerability index method based on fractal theory,And the results of the methods were compared and analyzed.Firstly,based on the geological and hydrogeological data of Wanghangzhuang Coal Mine,the fractal dimension of the fault is calculated and the fractal dimension contour map of the fault is calculated.The complexity of the fault structure is evaluated and the fractal dimension figured.The fractal dimension is used to represent the fault scale and development degree of the fault in the mining area,and the fault structure in Wangxingzhuang coal mine complex medium.Secondly,The risk of water inrush in Wang xingzhuang No.Ⅱ1 coal seam is evaluated by the double coefficient method of five graphs,and the risk of water inrush from the bottom of the coal seam in Wang xingzhuang Coal Mine was evaluated.The results show that most of the blocks in the study area are non-pressurized relative to the safe area,the middle area is the non-pressurized relative hazard zone,the northwest region is the non-pressure zone,and the northwest and central and southern parts are straight through water Dangerous area.Then,taking Wang xingzhuang Coal Mine as an example,give a hazard assessment on water bursting from bed bottom of No.Ⅱ1 coal bed based on GIS and AHP vulnerability index method,and give an risk zoning.The results show that the fragile areas are mainly located in the northwest and southwest of the study area,accounting for 15.18% of the total area.The more vulnerable areas are mainly located in the northwest and southwest of the study area,accounting for 22.51% of the total area.The area is located in the middle of the study area,accounting for 28.23% of the total area.The safe area is located in the middle and eastern and central regions of the study area,accounting for 18.54% of the total area.The relatively safe area is mainly located in the eastern part of the study area,accounting for 15.54 %.Finally,based on the maximum membership principle and the two evaluation results,the comprehensive evaluation of the risk of water inrush in the study area was obtained.The results of the evaluation showed that the area in the southeastern area of the study area was safe area,Accounting for 11.76% of the total area of the study area.The southwestern part of the study area and the northeastern region are more dangerous areas,accounting for 41.60% of the total area of the study area.The northwestern part of the study area and the central and southern regions are the dangerous areas,And 42.50% of the area.The area in the northwest part of the study area is a straight-through water inrush area,accounting for 4.13% of the total area of the study area.