シールド掘進に伴う洪積砂層における付加土圧発生機構の実験研究

抄録

To investigate influences on neighboring structures during shield driving, centrifuge tests reported here were performed at a centrifugal acceleration of 70G using 1/70th scale shield machine model in diluvial sandy layer. In a series of the tests where shield machine plate friction, overburden pressure and shield thrusting speed were parameters, earth pressure surrounding a shield machine and bending moment of neighboring existing model piles were measured during shield driving. Based on the test results, we evaluated the distribution of the additional earth pressure surrounding a shield machine and relation with the distance from the machine. Behavior of the existing neighboring piles was analytically simulated by using a beam-spring model applied on the additional earth pressure.