Impact Study of Deep Foundations Construction of Inclined and Straight Combined Support Piles on Adjacent Pile Foundations

Abstract

An inclined straight combination support pile can play a better role in deep foundation pit support, especially for the protection of adjacent structural pile foundations. We take a section of the construction of a deep foundation pit project in Wuhan City, Hubei Province as the research object. This paper studies the influence of inclined and straight combination support piles on the bending moment and displacement behavior of adjacent pile foundations during the construction of foundation pits under the influence of different factors such as distance from the excavation surface, pit angle effect, inclined pile tilt angle, pit depth to width ratio, and construction conditions on the adjacent pile foundation using a three-dimensional finite element model. According to the research results, as the distance from the excavation surface increases, the bending moment of the adjacent pile foundation decreases, and the closer the pile is to the foundation pit, the greater the horizontal displacement of the pile; the bending moment and displacement of the pile foundation are supported by the pit angle effect. Moreover, the pile bending moment increases with the increase of the pit depth–width ratio, and the maximum displacement point of the pile body gradually moves down from the middle of the pile body to the bottom of the pile foundation as the excavation depth of the pit increases. In addition, the minimum displacement of the adjacent pile foundation is at the top of the pile, and the maximum displacement is at the middle of the pile. Finally, compared with the static analysis, the whole process of dynamic simulation can reflect the dangerous working conditions in the project construction process, and make a more complete safety control construction plan for the project construction process.

Bearing and deformation characteristics of monopile foundation under monotonic and cyclic horizontal loads

“…Extensive experimental and numerical simulations have carried out to investigate the lateral behavior of monopile under monotonic and cyclic horizontal loads. 3 – 25 The effects of the pile-soil relative stiffness, 6 – 9 pile diameter D, 15 , 16 soil relative density, 18 – 20 loading rate, 17 loading frequency, 5 loading amplitude, 21 loading direction (e.g. unidirectional or bidirectional), 22 – 24 the number of cycles, 6 existing vertical load, 25 and inclination angle 3 , 4 on the lateral behavior of pile were mainly focused.…”

Study on Dynamic Response of Inclined Pile Group Foundation under Earthquake Action

“…The bearing capacity and seismic performance of inclined pile groups have been paid attention to by geotechnical engineering researchers. The research methods of inclined piles mainly include laboratory tests [4][5][6][7][8] and numerical calculations [9][10][11][12][13][14][15]. Some scholars also analyzed inclined piles using the p-y curve method.…”

Evaluating Differences in Foundation Depth Planning and Implementation for Building Structure Safety

“…However, in its implementation, the foundation erection experienced a difference in depth from the initial plan that had been made. Differences in foundation depth can affect the strength and stability of the building structure [9]. In addition, a foundation depth that is not according to plan allows excessive settlement to occur due to the reduced bearing capacity of the foundation [10].…”