Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Study on Long-Span and Variable-Section Foundation Pit Excavation in Muddy Silty Clay
The construction of large-span and variable-section foundation pits in silty soil is challenging. Soil creep often leads to engineering problems such as excessive settlement, uneven settlement, and slope instability. This study proposes a new construction method, which is suitable for the inconsistent bottom elevation of a foundation pit by taking the long-span and variable-section foundation pit in Nanjing as an example. The construction process parameters were determined based on ABAQUS, and the accuracy of the numerical model and safety of the construction method were verified by field monitoring. The results show that foundation pit deformation increases with the distance between the supporting erection and the step length. Basal uplift decreased with an increase in excavation distance in the shallow area. The influence of the steel support erection time within 12 h on the foundation pit deformation was the most evident. The proportion of creep deformation in the foundation pit deformation on the early excavation side was approximately 21.6%, which was higher than that on the late excavation side. The location of the soft soil layer has an evident influence on the deformation of the foundation pit, and the creep deformation can reach 11% of the total displacement when it is located at half of the excavation depth.
Study on Long-Span and Variable-Section Foundation Pit Excavation in Muddy Silty Clay
The construction of large-span and variable-section foundation pits in silty soil is challenging. Soil creep often leads to engineering problems such as excessive settlement, uneven settlement, and slope instability. This study proposes a new construction method, which is suitable for the inconsistent bottom elevation of a foundation pit by taking the long-span and variable-section foundation pit in Nanjing as an example. The construction process parameters were determined based on ABAQUS, and the accuracy of the numerical model and safety of the construction method were verified by field monitoring. The results show that foundation pit deformation increases with the distance between the supporting erection and the step length. Basal uplift decreased with an increase in excavation distance in the shallow area. The influence of the steel support erection time within 12 h on the foundation pit deformation was the most evident. The proportion of creep deformation in the foundation pit deformation on the early excavation side was approximately 21.6%, which was higher than that on the late excavation side. The location of the soft soil layer has an evident influence on the deformation of the foundation pit, and the creep deformation can reach 11% of the total displacement when it is located at half of the excavation depth.
Study on Long-Span and Variable-Section Foundation Pit Excavation in Muddy Silty Clay
Int J Civ Eng
Liu, Yanchao (Autor:in) / Huang, Feng (Autor:in) / Wang, Guihe (Autor:in) / Cao, Yanhui (Autor:in) / Li, Bo (Autor:in)
International Journal of Civil Engineering ; 22 ; 739-755
01.05.2024
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Study on Long-Span and Variable-Section Foundation Pit Excavation in Muddy Silty Clay
| Springer Verlag | 2024
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| Europäisches Patentamt | 2021