A Generalized Formulation of the Adapted Terzaghi Method of Arching in Column-Supported Embankments

For soft soils, the creep settlement plays an important role in the full life-cycle performance of infrastructures, which is a serious concern for engineers and researchers. Columns, e.g. deep cement mixed (DCM) soil columns, are commonly adopted to treat soft grounds in order to reduce the full-life settlement of the infrastructures. However, the creep behavior of soft grounds treated by DCM soil columns is often neglected, inducing underestimated total settlements or unexpected differential settlements. In this study, a new calculation method is developed for the life-cycle settlement of column-improved soft grounds by considering the creep of soft soils and load transfer between the columns and surrounding soils. A physical model test with double-layer soils improved by DCM soil columns was designed and performed to demonstrate the feasibility of the calculation method. It is found that the settlements calculated by the proposed method show good agreement with the measured data in the physical model. A parametric study was conducted, revealing that the calculated settlement of the double-layer soil improved by DCM columns can be largely influenced by the stress concentration ratio, the permeability of the DCM columns, and the area replacement ratio. Finally, the proposed method was applied to calculate the settlement in a real project.

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“…Adapted Terzaghi method proposed by Sloan et al (2011) was used to consider the soil arching effect and calculate s n .…”

Section: Settlement Calculationmentioning

confidence: 99%

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

Feng

Qin

et al. 2023

Int. J. Geomech.

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“…The earth pressure value is in line with the actual situation. In addition, soil arching effects on the double-row piles were investigated, when they were applied on stabilizing slopes [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Active and Passive Earth Pressure Calculation Method for Double-Row Piles considering the Nonlinear Pile Deformation

Zhou

Chen

2022

Geofluids

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The double-row pile supporting structure has been widely used in foundation pit excavations. When analyzing the effect of earth pressure on the pile structure, previous research only considered the double-row piles as the rigid body and the pile-soil interaction has not been examined. In this study, a theoretical model was developed based on Duncan-Chang’s hyperbolic theory to calculate earth pressures in the active and passive zones of the double-row pile supporting structure. The model considered the nonlinear effect of the pile deformation on the active and passive earth pressures. The macroscopic pile-soil interaction was converted into a microscopic stress-strain relationship at a certain point in the soil body, reflecting the nonlinear effect of pile deformation on earth pressure. Numerical simulation and large-scale field tests have been conducted to verify the proposed model. The results show that the average values of the parameters obtained by numerical simulation are a ¯ = 0.38 , b ¯ = − 0.253 for the active zone and a ¯ = 0.00612 , b ¯ = − 0.729 for the passive zone. Based on the values of a ¯ and b ¯ , the predicted active and passive earth pressures stemming from the developed model agreed well with those obtained from field tests. The developed model in this study can be used to predict the distribution of active and passive earth pressures for double-row pile supporting structures.

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“…Nunez et al (2013) and Ariyarathne and Liyanapathirana (2015) indicated that the current design methods resulted in much different load transfer results. However, few studies have been focused on the influence of the number of geosynthetic layers on the behavior of geosynthetic-reinforced pile-supported platforms (Collin, 2004;Sloan et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

Zhang¹,

Wang²,

Ye³

et al. 2017

dtmse

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Geosynthetic-reinforced pile-supported earth platforms have been increasingly used to support infrastructures, such as embankments, retaining walls, and storage tanks constructed over soft soils around the world. On the top of piles, one or more layers of geosynthetics are usually placed. However, the effect of number of geosynthetic layers on the behavior of geosynthetic-reinforced pile-supported earth platforms has not been well explored so far. Based on a well-instrumented large-scale test, a threedimensional (3-D) numerical study was conducted to investigate the behavior of geosynthetic-reinforced pile-supported earth platforms with different number of geosynthetic layers. The numerical results showed that the inclusion of geosynthetics enhanced the efficiency of load transfer. The critical heights of soil arching were almost constant with different numbers of reinforcement layers. The maximum tensile strain in the lower reinforcement was on the edge of pile caps while the maximum tensile strain in the upper reinforcement was close to the pile center. When the square caps were installed in a triangular pattern, the maximum strain in reinforcement is concentrated in the strip bridging two adjacent cap corners.

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A Generalized Formulation of the Adapted Terzaghi Method of Arching in Column-Supported Embankments

Cited by 6 publications

References 2 publications

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

Active and Passive Earth Pressure Calculation Method for Double-Row Piles considering the Nonlinear Pile Deformation

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

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