A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deformation Characteristics of Ultra-Deep Foundation Pit in Yangtze River Floodplain with Multi-grade Dewatering
https://orcid.org/http://orcid.org/0000-0001-6477-8864
Multi-grade dewatering is an effective means to reduce the influence of large head difference on the foundation pit retaining structure and surrounding structures. The behavior of the waterproof curtain and the ground surface for the ultra-deep excavation and multi-grade dewatering in the Yangtze River floodplain was carried out through the case study. Then according to the field observation in terms of the data size, the position of maximum data, and the trend of data over time, a two-dimensional fluid–solid coupling calculation model considering transient dewatering was established to study the mechanism of multi-grade dewatering. The results show that the maximum horizontal displacement of the first waterproof curtain of the ultra-deep foundation pit constructed by the top-down method is 0.1%H, where H is the excavation depth. The ground settlement reaches 0.5δs at a distance of 2H behind the curtain, where δs is the maximum settlement. The horizontal displacement variation of the curtain and the ground settlement variation during the structure construction stage accounted for 2/3 of those during the excavation stage. The decrease in water head between two waterproof curtains can reduce the horizontal displacement of the first waterproof curtain by 14.05% and increase the horizontal displacement of the second waterproof curtain and the ground settlement by 12.88% and 22.89%, respectively, in this study.
Deformation Characteristics of Ultra-Deep Foundation Pit in Yangtze River Floodplain with Multi-grade Dewatering
https://orcid.org/http://orcid.org/0000-0001-6477-8864
Multi-grade dewatering is an effective means to reduce the influence of large head difference on the foundation pit retaining structure and surrounding structures. The behavior of the waterproof curtain and the ground surface for the ultra-deep excavation and multi-grade dewatering in the Yangtze River floodplain was carried out through the case study. Then according to the field observation in terms of the data size, the position of maximum data, and the trend of data over time, a two-dimensional fluid–solid coupling calculation model considering transient dewatering was established to study the mechanism of multi-grade dewatering. The results show that the maximum horizontal displacement of the first waterproof curtain of the ultra-deep foundation pit constructed by the top-down method is 0.1%H, where H is the excavation depth. The ground settlement reaches 0.5δs at a distance of 2H behind the curtain, where δs is the maximum settlement. The horizontal displacement variation of the curtain and the ground settlement variation during the structure construction stage accounted for 2/3 of those during the excavation stage. The decrease in water head between two waterproof curtains can reduce the horizontal displacement of the first waterproof curtain by 14.05% and increase the horizontal displacement of the second waterproof curtain and the ground settlement by 12.88% and 22.89%, respectively, in this study.
Deformation Characteristics of Ultra-Deep Foundation Pit in Yangtze River Floodplain with Multi-grade Dewatering
https://orcid.org/http://orcid.org/0000-0001-6477-8864
Multi-grade dewatering is an effective means to reduce the influence of large head difference on the foundation pit retaining structure and surrounding structures. The behavior of the waterproof curtain and the ground surface for the ultra-deep excavation and multi-grade dewatering in the Yangtze River floodplain was carried out through the case study. Then according to the field observation in terms of the data size, the position of maximum data, and the trend of data over time, a two-dimensional fluid–solid coupling calculation model considering transient dewatering was established to study the mechanism of multi-grade dewatering. The results show that the maximum horizontal displacement of the first waterproof curtain of the ultra-deep foundation pit constructed by the top-down method is 0.1%H, where H is the excavation depth. The ground settlement reaches 0.5δs at a distance of 2H behind the curtain, where δs is the maximum settlement. The horizontal displacement variation of the curtain and the ground settlement variation during the structure construction stage accounted for 2/3 of those during the excavation stage. The decrease in water head between two waterproof curtains can reduce the horizontal displacement of the first waterproof curtain by 14.05% and increase the horizontal displacement of the second waterproof curtain and the ground settlement by 12.88% and 22.89%, respectively, in this study.
Deformation Characteristics of Ultra-Deep Foundation Pit in Yangtze River Floodplain with Multi-grade Dewatering
Iran J Sci Technol Trans Civ Eng
Yang, Tao (author) / Tong, Liyuan (author) / Che, Hongbo (author) / Yan, Xin (author) / Li, Dan (author)
2022-10-01
16 pages
Article (Journal)
Electronic Resource
English
Optimization of dewatering schemes for a deep foundation pit near the Yangtze River, China
| DOAJ | 2018
Optimization of dewatering schemes for a deep foundation pit near the Yangtze River, China
| Elsevier | 2018
Dewatering construction method for ultra-deep foundation pit in sandy soil
| European Patent Office | 2023