Abstract
As the coastal region is the most developed region in China, an increasing number of engineering projects are under construction in it in recent years. However, the quality of these projects is significantly affected by groundwater, which is influenced by tidal variations. Therefore, the regional groundwater dynamic characteristics under tidal impact and the spatiotemporal evolution of the seepage field must be considered in the construction of the projects. Then, Boussinesq function was introduced into the research to deduce the seepage equation under tidal influence for the coastal area. To determine the spatiotemporal evolution of the deep foundation pit seepage field and the coastal seepage field evolution model, numerical calculations based on changes in the tidal water level and seepage equation were performed using MATLAB. According to the developed model, the influence of the seepage field on the foundation pit supporting structure in the excavation process was analyzed through numerical simulations. The results of this research could be considered in design and engineering practice.
Highlights
Groundwater seepage significantly impacts the stability of foundation pit engineering and the deformation of the foundation pit support structure and, is a major factor in several foundation pit engineering accidents [1,2,3]
In order to investigate the influences of seepage field on mechanical property, Wang [5] developed a 3-Dimensional Stochastic Seepage finite element model and proposed a more comprehensive stochastic algorithm to analyze seepage field problems
To solve the seepage mechanics problems of a foundation pit affected by tides, the equation of the seepage flow was deduced and the time–space evolution model of a seepage field for a deep foundation pit was established based on the Boussinesq function
Summary
Groundwater seepage significantly impacts the stability of foundation pit engineering and the deformation of the foundation pit support structure and, is a major factor in several foundation pit engineering accidents [1,2,3]. To explore the impact of changes in seawater tides on variations in groundwater levels, Jacob [7] first established a one-dimensional tidal seepage equation. Jeng et al [8] established a new groundwater seepage model by considering the dynamic effects of the phreatic aquifer on the head fluctuations in the confined aquifer and derived a closed-form analytical solution. Zhang et al [10] considered the mechanical properties and seepage characteristics of aquifers to explore the interaction between the water level and seepage flow and to express the relationship between confined groundwater and tides using a mathematical equation. To explore the deformation properties of the supporting structure in a deep foundation pit under tidal impact, a spatiotemporal evolution model of the seepage field was established in accordance with the onsite water level monitoring results of a deep foundation pit in a coastal area. A finite difference simulation software program was used to simulate the excavation process of the pit
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