International Science Index


10011333

Assessing the Impact of Underground Cavities on Buildings with Stepped Foundations on Sloping Lands

Abstract:

The use of sloping lands is increasing due to the reduction of suitable lands for the construction of buildings. In the design and construction of buildings on sloping lands, the foundation has special loading conditions that require the designer and executor to use the slopped foundation. The creation of underground cavities, including urban and subway tunnels, sewers, urban facilities, etc., inside the ground, causes the behavior of the foundation to be unknown. In the present study, using Abacus software, a 45-degree stepped foundation on the ground is designed. The foundations are placed on the ground in a cohesive (no-hole) manner with circular cavities that show the effect of increasing the cross-sectional area of ​​the underground cavities on the foundation's performance. The Kobe earthquake struck the foundation and ground for two seconds. The underground cavities have a circular cross-sectional area with a radius of 5 m, which is located at a depth of 22.54 m above the ground. The results showed that as the number of underground cavities increased, von Mises stress (in the vertical direction) increased. With the increase in the number of underground cavities, the plastic strain on the ground has increased. Also, with the increase in the number of underground cavities, the change in location and speed in the foundation has increased.

References:
[1] V. Guglielmetti, P. Grasso, A. Mahtab, S. Xu, “Mechanized Tunneling in Urban Areas: Design Methodology and Construction Control”, (V. Guglielmetti, Ed.) London: Taylor And Francis Elibrary, ISBN: 978-0-203-393851-5 (Ebook), 2007.
[2] W. Zhang, L. Han, X. Gu, L. Wang, F. Chen, H. Liu, “Tunneling and Deep Excavations in Spatially Variable Soil And Rock Masses: A Short Review”, Underground Space, Pii: S2467-9674(20)30007-6, 2020.
[3] X. Huang, W. Liu, Z. Zhang, Q. Zhuang, Y. Zhu, Qi Wang, C. Y. Kwok, S. Wang, Structural Behavior of Segmental Tunnel Linings for a Large Storm Water Storage Tunnel: Insight from Full-Scale Loading Tests, Tunnelling and Underground Space Technology 99 (2020) 103376, 2020.
[4] M. Nematollahi, D. Dias, Interaction between an Underground Parking and Twin Tunnels – Case of the Shiraz Subway Line, Tunnelling and Underground Space Technology 95 (2020) 103150, 2020.
[5] J. F. Ruiz, P. J. Soares, P. Alves Costa, D. P. Connolly, “The Effect of Tunnel Construction on Future Underground Railway Vibrations”, Soil Dynamics and Earthquake Engineering 125 (2019) 105756, 2019.