Name: NGO@NGOC@CUONG Analysis of SENS machine behavior by using shield dynamics model Supervisor: Mitsutaka SUGIMOTO SENS, a new tunnel construction method, is worldfs first adopted in Sanbongihara tunnel on the Tohoku Shinkansen, and has been demonstrated to be a superior method of construction in terms of safety, construction workability, and economic efficiency. It was awarded the Japan Industrial Technology Award Jury Special Prize in 2006 and the 37th Civil Society Technology Award. Tsugaru Yomogida tunnel on the Hokkaido Shinkansen, which adopted SENS for the second time in the world, is also safety through October 2012. In the future, it is considered that applying the SENS is going to increase in the deep underground metropolitan areas, because these areas were configured by the Diluvium - Neogene layer, where SENS is intended. SENS is the recently-developed tunnel construction method and has just been applied two times in the world, therefore there is a problem in need of further research and development. For example, for controlling of the shield machine, because of the striking concrete from the shield machine backward to the wife formwork, it is necessary to keep a constant distance between the inner formwork and the shield device, and furthermore, it is required much higher accuracy in controlling the position and orientation of the shield machine than conventional shields. In the other hand, the controlling of SENS machine is along the planning alignment, on-site registration, and has been adjusted conditions of using copy cutter, the center bending angle and jack force. The following problems are considered. 1. The mechanical equilibrium conditions of SENS machine are not considered. Temporarily, if the condition of using copy cutter and center bending angle are inappropriate, the planning alignment of tunnel will be deviated. 2. The occurrence of an excessive shield jack force due to the contact of SENS machine and ground, and the occurrence of an unbalanced load in the inner formwork as the result. 3. Lack the thickness of the primary lining concrete due to the meandering of SENS machine. In this study, by organizing the field measurement data and using the shield dynamics model, we have carried out the behavior analysis of SENS machine for learning the reasons of the propulsion rise phenomenon that was occurred in Tsugaru Yomogida tunnel.