The method of test for state of railway tunnel lining based on association rules

Some improvements are made to Apriori algorithm based on SQL, thus reduce the number of intermediate tables, save the memory space and improve the efficiency of the algorithm. The improved algorithm is applied in railway tunnel lining condition monitoring data management system. Design the test process of this algorithm, and mine frequency sets, then gets the association rules between different tunnel diseases to better guide the tunnel disease prevention and maintenance work.