Abstract
A numerical model for the construction process of long spiral CFG piles is established based on the coupled Eulerian–Lagrangian method. The construction process is divided into drilling process and concrete pouring process for modeling. The influence of long spiral CFG piles construction on saturated sand foundation is studied, and dynamic responses, changes of pore water pressure, and void ratio of saturated sand foundation are obtained. The rationality and accuracy of the simulation results are proved by comparing with the field test data and calculation results of the theory of cylindrical cavity expansion. The presented numerical results prove that the vibration load generated during the construction acts on saturated soil in the form of irregular reciprocating shear forces, which leads to a large excess pore water pressure in the soil and an increase in soil void ratio. Both the excess pore water pressure field generated during the construction and the soil pore ratio after the construction show a parabolic distribution in the vertical direction. The research results can provide reference and theoretical basis for future research and engineering practice.
Highlights
E coupled Eulerian–Lagrangian (CEL) method is applied in this paper to numerically analyze the construction process of long spiral CFG piles and to research the influence of the construction on the saturated sand foundation. e numerical analysis method is briefly introduced and two numerical models are given to simulate the construction process of CFG piles. e field test and test results are shortly introduced to illustrate the influence of field construction. e results of simulation are discussed and compared with theoretical analysis results
Noh [33] proposed the coupled Eulerian–Lagrangian method to deal with the large deformation problems. e principle of the CEL method is to use Lagrangian elements for objects with greater stiffness, while Euler elements are used for materials that are prone to greater deformation in the analysis. is method that combines the advantages of the Eulerian formulation with the advantages of Lagrangian formulation overcomes mesh distortion problems
E Lagrangian structure can invade Eulerian material while Eulerian material is forced to move around when Lagrangian structure interacts with Eulerian materials. e Eulerian material is tracked as it flows through the mesh by computing its Eulerian volume fraction (EVF). e EVF of material in each Eulerian element is between 0 and 1. 1 means that the element is completely filled with the material
Summary
When the construction of CFG piles is carried out in this area, the vibration load generated by the drilling tool will lead to liquefaction of saturated soil. Yang [19] considered the construction process of bored cast-in-place piles by equating the drilling process with the load of holewall It did not simulate the dynamic process in a real sense. Neither of the first two methods can effectively simulate the fragmentation and flow of soil involved in the construction of long spiral CFG piles, while the CEL method in ABAQUS can make up for the above deficiencies. E CEL method is applied in this paper to numerically analyze the construction process of long spiral CFG piles and to research the influence of the construction on the saturated sand foundation. E CEL method is applied in this paper to numerically analyze the construction process of long spiral CFG piles and to research the influence of the construction on the saturated sand foundation. e numerical analysis method is briefly introduced and two numerical models are given to simulate the construction process of CFG piles. e field test and test results are shortly introduced to illustrate the influence of field construction. e results of simulation are discussed and compared with theoretical analysis results
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
