Abstract
Support pattern is the most important factor affecting the stability of foundation pit. In order to study the stable state of deep foundation pit, this paper selects pile pillared support and pile-anchor retaining which are high accident rate for comparison, and optimizes the construction scheme combined with the actual deep foundation pit project. The deformation of the supporting structure and the settlement of the foundation pit of Huiquan Square are used to analyze by FLAC3D. The variation range and trend of the internal force of the steel support and the axial force of the anchor cable are analyzed under the different values of the soil layer parameters, such as elastic modulus, cohesion and internal friction angle. The results show that the internal force of pile pillared support is greatly affected by the change of cohesion and the anchor axial force is greatly affected by the change of elastic modulus and internal friction angle. Meanwhile, the influence degree of each soil layer parameter on the internal force of support structure is different, which provides reference suggestions for the selection of support pattern of deep foundation pit.
Highlights
The deep foundation pit support scheme is the main measure to ensure the deep foundation pit deformation
In order to study the stable state of deep foundation pit, this paper selects pile pillared support and pile-anchor retaining which are high accident rate for comparison, and optimizes the construction scheme combined with the actual deep foundation pit project
The variation range and trend of the internal force of the steel support and the axial force of the anchor cable are analyzed under the different values of the soil layer parameters, such as elastic modulus, cohesion and internal friction angle
Summary
The deep foundation pit support scheme is the main measure to ensure the deep foundation pit deformation. Cui et al[2] pointed out the key parameters affecting the deformation and stability of the foundation pit. Ye et al[3] compared the simulated values with the actual monitoring values under different excavation conditions of deep foundation pits, and pointed out that with the increase of the excavation depth, the surface settlement and the horizontal displacement of the retaining structure increased. The researches focus mainly on the mechanism of support, and few studies on the influence of soil layer parameters on the support method. We analyse by FLAC3D the internal force of the steel support and the axial force of the anchor cable under the different values of the soil layer parameters, such as elastic modulus, cohesion and internal friction angle
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