A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A New Method for Piping Risk Evaluation on Unconfined Aquifers under Dewatering of Deep Foundation Pits
https://orcid.org/https://orcid.org/0000-0002-7749-0824
https://orcid.org/https://orcid.org/0000-0003-1594-6950
https://orcid.org/https://orcid.org/0000-0003-3238-7273
https://orcid.org/https://orcid.org/0000-0002-2247-9652
This paper presents a new method to evaluate the piping risk of unconfined sandy cobble aquifers during the dewatering of deep foundation pits. Firstly, the possibility of piping is judged according to the particle size distribution and pore diameter of the sandy cobble stratum. Secondly, the critical hydraulic gradients of particles with different sizes are calculated according to the pipe flow model. Thirdly, the hydraulic gradient around the foundation pit during the dewatering process is calculated by numerical method. Then, combined with the distribution of hydraulic gradient around the foundation pit and the critical hydraulic gradients of particles with different sizes, the range of moveable particles with different sizes in the surrounding stratum is evaluated. Finally, according to the sandy cobble aquifers conditions and the influence of particle movement on the stratum, the level of piping risk is determined. This method was successfully applied to evaluate the piping risk of Tawan Station in Luoyang Metro Line No.1, and according to the risk evaluation the pensile curtain was recommended for the retaining structure in this case. From the satisfied applications, this method is a reference for the evaluation of piping risk and selection of retaining structure when considering the impact of the dewatering in deep foundation pit with unconfined aquifers on the surrounding stratum.
A New Method for Piping Risk Evaluation on Unconfined Aquifers under Dewatering of Deep Foundation Pits
https://orcid.org/https://orcid.org/0000-0002-7749-0824
https://orcid.org/https://orcid.org/0000-0003-1594-6950
https://orcid.org/https://orcid.org/0000-0003-3238-7273
https://orcid.org/https://orcid.org/0000-0002-2247-9652
This paper presents a new method to evaluate the piping risk of unconfined sandy cobble aquifers during the dewatering of deep foundation pits. Firstly, the possibility of piping is judged according to the particle size distribution and pore diameter of the sandy cobble stratum. Secondly, the critical hydraulic gradients of particles with different sizes are calculated according to the pipe flow model. Thirdly, the hydraulic gradient around the foundation pit during the dewatering process is calculated by numerical method. Then, combined with the distribution of hydraulic gradient around the foundation pit and the critical hydraulic gradients of particles with different sizes, the range of moveable particles with different sizes in the surrounding stratum is evaluated. Finally, according to the sandy cobble aquifers conditions and the influence of particle movement on the stratum, the level of piping risk is determined. This method was successfully applied to evaluate the piping risk of Tawan Station in Luoyang Metro Line No.1, and according to the risk evaluation the pensile curtain was recommended for the retaining structure in this case. From the satisfied applications, this method is a reference for the evaluation of piping risk and selection of retaining structure when considering the impact of the dewatering in deep foundation pit with unconfined aquifers on the surrounding stratum.
A New Method for Piping Risk Evaluation on Unconfined Aquifers under Dewatering of Deep Foundation Pits
https://orcid.org/https://orcid.org/0000-0002-7749-0824
https://orcid.org/https://orcid.org/0000-0003-1594-6950
https://orcid.org/https://orcid.org/0000-0003-3238-7273
https://orcid.org/https://orcid.org/0000-0002-2247-9652
This paper presents a new method to evaluate the piping risk of unconfined sandy cobble aquifers during the dewatering of deep foundation pits. Firstly, the possibility of piping is judged according to the particle size distribution and pore diameter of the sandy cobble stratum. Secondly, the critical hydraulic gradients of particles with different sizes are calculated according to the pipe flow model. Thirdly, the hydraulic gradient around the foundation pit during the dewatering process is calculated by numerical method. Then, combined with the distribution of hydraulic gradient around the foundation pit and the critical hydraulic gradients of particles with different sizes, the range of moveable particles with different sizes in the surrounding stratum is evaluated. Finally, according to the sandy cobble aquifers conditions and the influence of particle movement on the stratum, the level of piping risk is determined. This method was successfully applied to evaluate the piping risk of Tawan Station in Luoyang Metro Line No.1, and according to the risk evaluation the pensile curtain was recommended for the retaining structure in this case. From the satisfied applications, this method is a reference for the evaluation of piping risk and selection of retaining structure when considering the impact of the dewatering in deep foundation pit with unconfined aquifers on the surrounding stratum.
A New Method for Piping Risk Evaluation on Unconfined Aquifers under Dewatering of Deep Foundation Pits
KSCE J Civ Eng
Li, Da (author) / Ma, Jianjun (author) / Wang, Chaosheng (author) / Gao, Xiaojuan (author) / Fang, Mingjing (author)
KSCE Journal of Civil Engineering ; 26 ; 3275-3286
2022-08-01
12 pages
Article (Journal)
Electronic Resource
English
Method of calculation of dewatering of foundation pits under structures
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