Abstract
The air shaft deep foundation pit 6 is influenced by subgrade unbalance loading of highway 312, specifically its deep horizontal displacement of supporting piles and subgrade settlement of expressway 312 under unsymmetrical load effect. This paper carries out construction monitoring and numerical simulation analysis and gives a detailed study on the influenced factors of support structure deformation. Calculation results show that subgrade unsymmetrical load has a great influence on deep horizontal deformation of supporting piles. The maximum horizontal displacement at the bias side is about three times more than non-bias side’s; when the distance of subgrade to foundation pit is the same as the depth of excavation, the influence of subgrade on pit can be ignored; as the cohesion and internal friction angle increases, the horizontal displacement of fender piles decreases. However, enlarging the embedded depth of supporting piles has no significant influence on the stability of foundation pit.
Highlights
In the process of the excavation of deep foundation pit, soil stress changes, ground surface settlement, building settlement and the surrounding pipeline deformation comes into being [1,2,3]
Monitoring results of deep horizontal displacement of supporting piles is an important guarantee to reflect the stability of foundation pits and is one of the main monitoring projects in the process of excavation
Fig. (2) shows the monitoring results of deep horizontal displacement of supporting piles when excavating to the bottom
Summary
In the process of the excavation of deep foundation pit, soil stress changes, ground surface settlement, building settlement and the surrounding pipeline deformation comes into being [1,2,3]. Deep foundation pits of subway station are generally located at the crowded urban central areas, the construction is faced with various challenges as the surrounding geology and environmental conditions are complex, as well as the adjacent buildings. The air shaft deep foundation pit 6 is taken as a project case, the air shaft 6 is influenced by the extreme bias. This paper carries out constructive monitoring on the support structure deformation during its excavation and subgrade deformation close to national highway 312, simulating analyzes the supporting pile deformation by using finite element analysis. According to software Midas with the actual excavation conditions, and makes detailed analysis on the influenced factors of support structure deformation. The air shaft deep foundation pit 6 is supported by bored piles and inner support is protected with shotcrete between piles.
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