TY - GEN
T1 - Piecewise-linear modeling of combined vacuum and surcharge preloading at the second bangkok international airport
AU - Doyle, Keith
AU - Qiu, Tong
PY - 2014
Y1 - 2014
N2 - Vacuum preloading is a common method to improve soft, fine-grained soil. While traditional surcharge preloading increases effective stress by increasing total stress, vacuum preloading increases effective stress by reducing pore pressure. This reduces the risk of shear failure, which can be a concern when using surcharge preloading on very weak soil. This paper presents a numerical model for large strain consolidation under combined vacuum and surcharge preloading. The model is based on a readily available radial consolidation model, known as RCS1, which is able to account for vertical and radial flow, soil self-weight, unload/reload effects, time-dependent loading, hydraulic conductivity anisotropy, soil smear, and partial prefabricated vertical drain (PVD) penetration. Additional capabilities of vacuum-induced consolidation are added to the original RCS1 to consider combined vacuum and surcharge loading. The developed model is utilized to simulate a well-published case history of combined vacuum and surcharge preloading at the Second Bangkok International Airport. Good agreement is observed between the simulated and recorded settlement vs. time and excess pore pressure versus time.
AB - Vacuum preloading is a common method to improve soft, fine-grained soil. While traditional surcharge preloading increases effective stress by increasing total stress, vacuum preloading increases effective stress by reducing pore pressure. This reduces the risk of shear failure, which can be a concern when using surcharge preloading on very weak soil. This paper presents a numerical model for large strain consolidation under combined vacuum and surcharge preloading. The model is based on a readily available radial consolidation model, known as RCS1, which is able to account for vertical and radial flow, soil self-weight, unload/reload effects, time-dependent loading, hydraulic conductivity anisotropy, soil smear, and partial prefabricated vertical drain (PVD) penetration. Additional capabilities of vacuum-induced consolidation are added to the original RCS1 to consider combined vacuum and surcharge loading. The developed model is utilized to simulate a well-published case history of combined vacuum and surcharge preloading at the Second Bangkok International Airport. Good agreement is observed between the simulated and recorded settlement vs. time and excess pore pressure versus time.
UR - http://www.scopus.com/inward/record.url?scp=84905860665&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84905860665&partnerID=8YFLogxK
U2 - 10.1061/9780784478509.0016
DO - 10.1061/9780784478509.0016
M3 - Conference contribution
AN - SCOPUS:84905860665
SN - 9780784478509
T3 - Geotechnical Special Publication
SP - 122
EP - 130
BT - Advances in Transportation Geotechnics and Materials for Sustainable Infrastructure - Selected Papers from the Proceedings of the Geo-Hubei 2014 International Conference on Sustainable Infrastructure
PB - American Society of Civil Engineers (ASCE)
T2 - Geo-Hubei 2014 International Conference on Sustainable Infrastructure: Advances in Transportation Geotechnics and Materials for Sustainable Infrastructure
Y2 - 20 July 2014 through 22 July 2014
ER -