Research On Construction And Application Of Classification And Control System Of Dynamic Disasters Under Complex Conditions Of Xin'an Mine

Xin'an Mine of Shuangyashan Mining Co.Ltd.is a coal and gas outburst,impact ground pressure mine,complex geological conditions,severely affected by power disasters.In recent years,with the increase of mining depth,the mining environment has become more and more complex,and with the increase of mining intensity,the power disaster has become increasingly serious.Although the Xin'an mine power disaster management work has achieved great results,it still cannot completely avoid the accident.Over the years,due to the lack of clarity on the definition of power disasters,the prevention and control measures adopted have been lack of pertinence,which has affected the accuracy and economy of the prevention and control of power disasters.Based on this,the paper analyzes the mechanism of coal mine dynamic disasters from the perspective of energy,and then divides the dynamic disaster attributes,and then constructs the Xin'an mine dynamic disaster classification prevention and control system to improve the pertinence and effectiveness of coal mine power disaster prevention and control measures.The paper takes 8 coal seams in the 8th mining area as the research background,and comprehensively applies laboratory experiments,theoretical analysis,numerical simulation and field test methods to carry out research.The study found:Xin'an Mine is at the inflection point of tectonic depression,with a contrast strength value of 0.57,which is a region with a serious degree of dynamic disaster.Due to the depth of mining,faults,folds,igneous rock intrusion,gas,mine pressure,etc.,the coal mining environment is more complicated.The ground stress measurement is carried out by the socket hole stress relief method.The average value of the maximum horizontal principal stress value and the self-heavy stress ratio is 2.46,indicating that the geostress field is dominated by horizontal tectonic stress.8 coal seams have a weak impact tendency,and the coalrock parameters of the pleated crankshaft vary greatly within 20m.For the complex geological structure,the numerical simulation method is used to obtain the risk of dynamic disasters when the angle of the pleated wing exceeds 15° and the deviation of the normal fault exceeds 5 m.Aiming at the problem of igneous rock intrusion,the model of igneous rock roof shear beam is established,and the three indexes of transitional thickness,transitional shear modulus and transient shear strength of igneous rock roof are proposed to determine whether the occurrence of dynamic disasters and the type of occurrence.Establish a unified energy equation for the roof,coal and gas multi-source energy that induces coal mine power disasters.According to the different levels of participation of various factors,it is reclassified into six categories of dynamic disaster attributes,and the basis for distinguishing different types of types is proposed.Combined with the actual situation of Xin'an Mine,the Xin'an Mine Dynamic Disaster Classification Prevention and Control System was constructed.The risk of dangerous disasters and dangerous areas on the working face are analyzed.For the solid energy induced type,the risk of roof fracture is evaluated from the perspective of hard rock stratum and roof rock stratum structure.The possibility index method is used to evaluate the high stress type dynamic hazard of coal.Dangerous area division by mining factors and the law of overburden movement.According to the Xin'an Mine Dynamic Disaster Classification Prevention and Control System,the incentives for the occurrence of dynamic disasters in the four dangerous areas of the 8101 working face are different.The selection of top blasting,large-diameter drilling pressure of coal seam,bottom blasting and gas drainage technology are selected.The safety production of the working face has been achieved and good social and economic benefits have been achieved.The research results will further improve the technical level of Xin'an mine power disaster prevention and control,provide theoretical guidance for the construction of safe and efficient mines,and provide reference for the prevention and control of power disasters in other similar conditions.The dissertation has 66 figures,31 tables,and 133 references.