Abstract
The improvement of soil undrained shear strength induced by installation of sand compaction pile (SCP), called set up effect, has observed in a number of field tests, but not been considered by the design code. Due to the lack of effective technical means, the numerical simulation of this problem mainly focused on single pile in the past studies. In this paper, a multi-stage Eulerian-Lagrangian (MSEL) technique is used to simulate the installation and consolidation process of double piles. Firstly, a centrifuge model test is used to benchmark this technique and reached a good agreement. Through the analysis of a single pile results, the strength growth curve conforming to the growth law is fitted. Finally, based on the results of single and double piles and considering the sheltering and accumulating effect, a method to predict the soil strength change after SCP group installation is proposed.
Highlights
Sand compaction pile (SCP) is a kind of foundation treatment technology with fast construction speed, wide application range and obvious reinforcement result
Because the clay is not removed before SCP construction, its installation will lead to soil deformation and generate a large amount of excess-pore pressure
On the back side of the 1st pile, the soil strength has almost no increase due to the sheltering effect. In view of this feature, the results of the double pile can be predicted by the fitting curve of the single pile, as shown in Figure 7, which is well compounded with the calculation results of the two piles
Summary
Sand compaction pile (SCP) is a kind of foundation treatment technology with fast construction speed, wide application range and obvious reinforcement result. Because the clay is not removed before SCP construction, its installation will lead to soil deformation and generate a large amount of excess-pore pressure. As it dissipates the effective stress and undrained shear strength will increase, named set-up [1]. The research on this effect is still insufficient, resulting in the inability to consider existing design specifications [5]. Numerical simulation of it faces great challenges. Based on the results of single pile, the curve of post-installation soil undrained shear strength was fitted. Compared with the double pile, a method to predict the strength after the installation of pile group was proposed
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