Buoyancy effects on structures : a case study on the controlled lowering of a raised underground garage

Čas, Bojan (avtor), Šporin, Jurij (avtor)

In recent decades, the height of buildings and the number of basement floors has increased, especially in valuable urban locations. With the development of cities and the infrastructure essential for their operation, extensive underground construction is being carried out, including utility lines, subway tunnels etc. Water accumulation, fluctuating or high groundwater levels in the area of underground structures, due to various reasons, might cause structures, forming a closed volume, to move upwards. The excessive buoyancy problem, which arises, when necessary, precautions are not taken, is often overlooked by engineers. The negative effects of buoyancy on structures typically manifest as uplifts, settlements, or rotations. The state of structures damaged by excessive buoyancy must be thoroughly investigated to determine whether rehabilitation is possible or if the underground structure needs to be completely removed due to the infeasibility or cost inefficiency of its possible rehabilitation. This paper presents a methodology for addressing the state of structures affected by excessive buoyancy to find a suitable technological rehabilitation solution, supported by a case study. It demonstrates how inadequate design and execution of a single detail of a three-story underground garage resulted in its sudden elevation due to buoyancy. Through a thorough examination of the site, the state of the raised structure, the original project documentation, and basic safety check of anti-floating stability, rehabilitation procedure for the successful and controlled lowering of the underground garage was developed.

• Jezik: Angleški jezik
• Ključne besede: civil engineering, underground garage, reinforced concrete, buoyancy, anti-floating stability, uplift, cracks, groundwater inflow, controlled lowering
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo ; NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 13 str.
• Številčenje: Vol. 71, art. 108121
• PID: 20.500.12556/RUL-166476
• UDK: 69
• ISSN pri članku: 2352-0124
• DOI: 10.1016/j.istruc.2024.108121
• COBISS.SI-ID: 221926659
• Datum objave v RUL: 14.01.2025

Gradivo je del revije

• Naslov: Structures
• Založnik: Elsevier, Institution of Structural Engineers
• ISSN: 2352-0124
• COBISS.SI-ID: 525573145

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: gradbeništvo, podzemna garaža, armirani beton, vzgon, stabilnost proti vzgonu, dvig, razpoke, vtekanje podzemnih voda, kontrolirano spuščanje

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0260
• Naslov: Mehanika konstrukcij