Abstract
The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.
Highlights
As the most important component of a foundation pit, the supporting structure is an important facility for ensuring its safety
The analysis shows that when the temperature rose, the crown beam expanded, which led to further deformation out of the foundation pit and enlarged the stress on the crown beam
The analysis confirmed that the deformation of rigid panel 2 was larger than that of rigid panel 1 because it was closer to the middle of the foundation pit, which led the stress on rigid panel 2 to increase more rapidly
Summary
As the most important component of a foundation pit, the supporting structure is an important facility for ensuring its safety. To ensure the construction efficiency, safety, economy, and environmental friendliness, it is significant that an appropriate supporting structure according to the characteristics of the foundation pit is chosen. The soil mixing walls have reliable structural strength, good water-retaining and anti-seepage performance, and they can be applied to deep foundation pits with multi-point supports. Diaphragm walls are a type of support with better performance because of their high rigidity and good sealing effect Due to their high cost, they are often used in foundation pits with high safety requirements [8,9]. Chapman et al proposed an analytical formula for the thermal stress on multi-layer horizontal supports It cannot distinguish the difference in the axial force on each support layer, which makes it unsuitable for deep foundation pit engineering with temperature gradients [18]. The research on the stability of this kind of foundation pit supporting structure is of great significance
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