Study on the importance of roadways based on topology and cascade failure
Given the problem that the importance of the roadway in the mine ventilation system cannot be objectively determined,the study analyses the importance from structure and function based on the complex characteristics of the ventilation network.The three parameters of degree centrality,betweenness centrality and closeness centrality are selected to calculate the structural importance of road-way nodes and branches.The functional importance is determined by the degree of influence of the air-tight cascading failure of the roadway on the air volume of the remaining roadways in the ventilation model.Integrated the importance of structure and function of roadway,an evaluation model of roadway importance of mine ventilation system is established.Taken the ventilation system of the north wing of Yuwu Coal Mine as an example,the topological structure of roadway in the comprehensive ventilation network and the influence of cascading failure are evaluated for its importance degree,and the impor-tance of each roadway in the ventilation system of the north wing is derived.The comprehensive impor-tance of the roadway is sorted out according to the type of wind flow in the roadway,and the compre-hensive importance of the ventilation subvertical,ventilation fan＞the comprehensive importance of the return airway＞the comprehensive importance of the working face＞the comprehensive importance of the intake airflow roadway is obtained.The accuracy of the ventilation model is evaluated with the weight of the comprehensive importance of the northern roadway,and the difference of the model are compared and analyzed with the traditional evaluation model.This research provides a reliable basis for the identifi-cation of key roadways in the mine ventilation system,the reliability assessment of the mine ventilation model,the monitoring of the mine air volume and the optimal design of the ventilation system.
mine ventilation systemroadway importancetopologycascade failureaccuracy of ven-tilation model
万方数据
维普
