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Dynamic response of three dimension tunnel on elastic foundation subjected to moving vehicle loads

This paper is devoted to study dynamic response of a tunnel surrounded by elastic foundation under moving vehicle loads by using the finite element method (FEM). The numerical results were then validated by an experimentation on a real structure. | Vietnam Journal of Mechanics, VAST, Vol. 37, No. 2 (2015), pp. 105 – 122 DOI:10.15625/0866-7136/37/2/5552 DYNAMIC RESPONSE OF THREE DIMENSION TUNNEL ON ELASTIC FOUNDATION SUBJECTED TO MOVING VEHICLE LOADS Nguyen Thai Chung∗ , Do Ngoc Tien Le Quy Don Technical University, Hanoi, Vietnam ∗ E-mail: thaichung1271@gmail.com Received November 24, 2014 Abstract. Dynamic response analysis of tunnel with elastic foundation subjected to the load such as the hydrostatic pressure, seismic or moving load is an important but complicate problem in transport engineering due to increasing of traffic volume. This paper is devoted to study dynamic response of a tunnel surrounded by elastic foundation under moving vehicle loads by using the finite element method (FEM). The numerical results were then validated by an experimentation on a real structure. Keywords: Tunnel, moving load, dynamic analysis, experimental testing. 1. INTRODUCTION ¨ Moller et al. [1], Vermeer et al. [2], investigated tunnel structures subjected to static loads in the framework of 3D model and validated then by experimental results. By using finite element method, Hyon et al. [3], Sramoon et al. [4], Hussein and Hunt [5], the tunnel structures subjected to moving load were analyzed by Shi et al. [6], Yang et al. [7], Clouteau and Degrande [8] using three dimensions model. In the latter studies the moving load is equivalently reduced to an immobile dynamic load on the pavement and three dimension model for tunnel with foundation has not been considered. This paper is devoted to study dynamic response of tunnel and foundation in three dimension model subjected to moving vehicle loads. First, the governing equations are derived by using the finite element procedure. Then, the system’s dynamic response is computed by using the Newmark’s method and MATLAB program. Finally, an experimental test on the reinforced concrete double tunnel in the Lang-Hoa Lac highway was carried out to validate the numerical model and