Research conclusions:(1) The controlled pre -blast technology was used for divisional and partial demolition of the support structure for secondary lining and the controlled weak smooth blast technology was used to the face for expansive excavation with bench and full-face method. By taking a series of technical measures, such as control of the explosive quantities, establishment of a number of the free faces, improvement of the transmission way and application of non -electric millisecond detonator network, the purpose of reducing blasting vibration was reached. (2) The real –time monitoring was conducted to the blasting vibration and it showed the monitored data accorded with the requirements of the process and target control, achieving the good effect. The shallow buried tunnel was constructed successfully in Yichang and Wanzhou areas with broken rocks and karst development, following the subsequence of "first construction single -track tunnel and later construction of double -track tunnel by demolition and expansive excavation blasting".