This paper presents the results of a study carried out to evaluate the effects induced in the structure of existing deep tunnels by driving the foundation piles of new large steel gas tanks located on the ground surface. The soil is formed predominantly by silt and sand layers overlying a thick clay deposit. The analysis was carried out using dynamic FLAC. The soil-structure interaction was analyzed first to determine the present stress state in the lining, then pile driving was simulated and the increase in stresses induced by such dynamic action in the tunnel lining was analyzed. Pile driving was simulated by means of an impulsive load applied to the soil at the maximum depth reached by the pile tip just above the tunnel axis. The analysis indicated that the maximum stress induced in the tunnel structure by pile driving is lower than the admissible compressive strength of the concrete.
|Titolo:||Analysis of stresses induced in an old deep tunnel by pile driving from the surface|
|Data di pubblicazione:||2001|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|