A Study of Vibration Reduction Effects of TBM and NATM Parallel Construction Methods according to Tunnel Depth and Size

The new Austrian tunnelling method (NATM) and tunnel boring machine (TBM) are methods for excavating underground spaces. NATM construction has noise vibration problems, excavation using TBM the disadvantage of high initial cost is limited by ground conditions. A parallel been developed to overcome these limitations. However, research on lacking, it crucial identify applicability in advance applying various blasting In this study, based measurement data site method, values generated when top surface existing were compared. Lastly, reduction effect two was analysed according depth size through 3D numerical analysis. As increases, at reduced up 83%. addition, as ratio with closer 1.0, decreases.