Effects of Vertical Motion on Uplift of Underground Structure Induced by Soil Liquefaction

Author:

Chou Jui-Ching1ORCID

Affiliation:

1. Department of Civil Engineering, National Chung Hsing University, Taichung 402, Taiwan

Abstract

The uplift of underground structures induced by soil liquefaction can damage underground structure systems. Numerical simulations have shown that uplift is positively correlated with the energy of horizontal input motion. However, the effects of vertical input motion on uplift have not been studied comprehensively in the past. Previous studies on the vertical motion concluded that the effects of vertical motion on uplift depend on the overall characteristics of earthquake motion. These motion characteristics have only been studied separately in previous studies. A comprehensive study to explore the interactions and overall effects of these characteristics on the uplift of underground structures is essential. In this study, the FLAC program with the PM4Sand model was used as a numerical tool to explore the effects of vertical input motion on the uplift of underground structures. The numerical model was calibrated using centrifuge test results, and 48 earthquake motions were selected as input motions to study the effects of the overall characteristics of earthquake motions on the uplift of underground structures. The simulation results show that the frequency content characteristics of horizontal and vertical motion are the major factors affecting the uplift magnitude and the responses of liquefiable soils. However, most simulation cases show that the inclusion of vertical motion causes a 10% difference in the tunnel uplift, compared to cases without vertical motion.

Funder

National Science and Technology Council

Publisher

MDPI AG

Reference22 articles.

1. Sasaki, T., and Tamura, K. (2004, January 17–22). Prediction of liquefaction-induced uplift displacement of underground structures. Proceedings of the 36th Joint Meeting US-Japan Panel on Wind and Seismic Effects, Gaithersburg, MD, USA.

2. Seismic response of large underground structures in liquefiable soils subjected to horizontal and vertical earthquake excitations;Liu;Comput. Geotech.,2005

3. Chou, J.C. (2010). Centrifuge Modeling of the BART Transbay Tube and Numerical Simulation of Tunnels in Liquefying Ground. [Ph.D. Dissertation, University of California].

4. Finite element analysis of floatation of rectangular tunnels following earthquake induced liquefaction;Madabhushi;Indian Geotech. J.,2015

5. Failure of circular tunnel in saturated soil subjected to internal blast loading;Han;Geomech. Eng.,2016

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