Two‐Dimensional Parametric Study of an Embankment on Clay Improved by an Artificial Crust Composite Foundation

Abstract

In order to reduce the foundation settlement, conserve resources, and be environmental-friendly while increasing the use of soil resources, an artificial crust layer formed by in situ stabilization is proposed to combine with prestressed pipe piles over soft ground in road construction. In this study, a centrifuge test and two-dimensional coupled-consolidation finite-element analyses are conducted to simulate the construction of an embankment. And a two-dimensional parametric study is conducted to study the performance indicated by maximum long-term settlement, excess pore water, and tensile stress under various conditions. The results of the centrifuge test clearly show that the measured settlement, excess pore water, and tensile stress are in good agreement with the calculated results. In addition, the key factors of pile spacing and thickness and strength of the crust have an influence on the maximum settlement, stress of the foundation, and tensile stress of the crust using the two-dimensional coupled-consolidation finite-element analyses. And the stress transfer regular of the foundation is analyzed under various conditions. Moreover, the failure of the crust contained tensile cracking and shearing failure and the thickness of the pile that pierced the crust are also affected by the key factors.

Settlement and stress analysis in stabilized slab- and pile-supported embankment based on double-equal settlement plane

“…Consequently, the main settlement was concentrated within the composite reinforcement area. The average increment rate of the settlement was 0.51 cm/ 0.1 m, which is close to that for the 2D numerical calculation by Wang et al (2020), i.e. 0.59 cm/ 0.1 m. Based on the increasing settlement and stress concentration ratios, the optimum thickness of the stabilized slab was chosen as 1.5 m-2.1 m.…”

“…Several studies have proposed using a slab stabilized with lime or cement to improve soft grounds, replacing GRPS embankments (Anggraini et al, 2015;Okyay and Dias, 2010;Ishikura et al, 2016;Wang et al, 2018Wang et al, , 2020Dang et al, 2021;Zhou et al, 2021;Chen et al, 2021). The stabilized slab and pile-supported (SSPS) embankment system differs from the GRPS embankment system because of the disparities between the mechanical behavior of stabilized slabs placed on piles with higher stiffness (elastic modulus) and cohesion to support embankments and the geosynthetic reinforcement with a low elastic modulus and no cohesion.…”

“…Wang et al (2018) studied the strength of stabilized soil as well as the settlement and the load distribution between soils and piles in situ stabilization combined with prestressed pipe piles over the soft ground by field investigations. Based on the 2D coupled-consolidation models, the influences of several critical factors, including pile spacing, thickness and strength of the stabilized slab on the maximum long-term settlement, excess pore water and tensile stress, were also discussed (Wang et al, 2020). Dang et al (2021) confirmed that using the fiber-reinforced load-transfer platform could effectively enhance the column-supported embankment behavior and that the shear strength properties of the fiberreinforced load-transfer platform played a crucial role in improving the overall performance of column embankments with increasing slab thickness.…”

“…(2018) studied the strength of stabilized soil as well as the settlement and the load distribution between soils and piles in situ stabilization combined with prestressed pipe piles over the soft ground by field investigations. Based on the 2D coupled-consolidation models, the influences of several critical factors, including pile spacing, thickness and strength of the stabilized slab on the maximum long-term settlement, excess pore water and tensile stress, were also discussed (Wang et al ., 2020). Dang et al .…”

Shear Strength Behavior of Sand Reinforced by Kraft Paper Using the Ring Shear Apparatus

“…e results showed that the antivibration performance of soil is improved with an increase in the number of reinforced layers. Tests have been conducted to explore the interaction between geosynthetics and soil [24][25][26][27][28][29], [30] and mathematical models have been proposed [31][32][33][34][35][36][37]. Although model tests can help in understanding the dynamic response characteristics of reinforced soil, numerical simulation results are more intuitive [38][39][40][41][42][43][44][45][46].…”