A numerical investigation of the impact of shield machine’s operation parameters on the settlements above twin stacked tunnels - A case study of Ho Chi Minh urban railway Line 1

Anh Do Ngoc; Daniel  Dias; Thang Trong Dang

doi:10.15625/2615-9783/16442

Author affiliations

Authors

Ngoc Anh Do Hanoi University of Mining and Geology, Faculty of Civil Engineering, Department of Underground and Mining Construction, Hanoi, Vietnam
Daniel Dias 1-Grenoble Alpes University, Laboratory 3SR, Grenoble, France; 2-Antea Group, Antony, France
Trong Thang Dang Vietnam Institute for Building Science and Technology - IBST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/16442

Keywords:

twin stacked tunnels, numerical simulation, shield operation, face pressure, grouting pressure, shield length

Abstract

Three-dimensional ﬁnite difference calculations are proposed to investigate the influence of operation parameters of the shield machines during twin stacked tunnel excavation on the surface settlements. The numerical model is validated by experimental data obtained from Hochiminh’s metro line 1 project, used as a reference case in this study. The parametric study focuses on the influence of the face support pressure, the grouting pressure, and the shield’s length. The numerical results indicated that a decrease does not always follow an increase in surface settlements' face and grouting pressure. A shorter shield machine causes smaller surface settlements to develop over single lower and twin stacked tunnels.

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