A quasi-equal strain solution for the consolidation of a rigid pile composite foundation under embankment loading condition

Lang, Ruiqing; Yang, Ailing

doi:10.1016/j.compgeo.2019.103232

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…Several scholars have extensively investigated composite foundations. Based on the deformation characteristics of rigid piles, Lang and Yang [6] proposed a quasi-equal strain hypothesis to analyze the consolidation characteristics of rigid pile composite foundations and verifed the rationality of this hypothesis by comparing theoretical derivation with numerical simulation results. Chen et al [7] used the equivalent continuum method to simplify a large number of compaction piles in the composite foundation.…”

Section: Introductionmentioning

confidence: 98%

Settlement Characteristics of Split Grouting Pile Composite Foundation in Loess Areas

Ming-ru

Liu

Chen

et al. 2022

Advances in Civil Engineering

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Loess foundations often affect the stability of superstructures due to their insufficient bearing capacities; thus, reinforcement measures are crucial for mitigating the uneven settlement of foundations. This study aims to investigate the settlement characteristics of composite foundations for loess foundations reinforced by splitting grouting piles. First, split grouting tests were carried out on loess foundations. After the test piles reached the design strength, static load tests and geotechnical tests were carried out to obtain the Q-s curves of the test piles. The pile-forming mechanism was analyzed via excavations at an on-site test pile. Furthermore, the traditional settlement calculation method of composite foundations was used to calculate the settlement of split grouting pile composite foundations, and the results were compared with field test results to explore a suitable settlement calculation method of split grouting pile composite foundations. Finally, the numerical model of split grouting pile composite foundations was established according to the pile forming mechanism, and the settlement deformation characteristics of single pile and pile group composite foundations were analyzed. The relative errors of the composite modulus method and the stress correction method for calculating the settlement of the composite foundations were 6.4% and 32.8%, respectively, and the composite modulus method was closer to the test values. The calculated curves of the numerical model were in good agreement with the measured curves and relevant literature research results, demonstrating the rationality of the modeling method; the findings of this study provide theoretical guidance for designing loess foundation splitting grouting reinforcement and for predicting settlement during later construction periods.

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Section: Introductionmentioning

confidence: 98%

Settlement Characteristics of Split Grouting Pile Composite Foundation in Loess Areas

Ming-ru

Liu

Chen

et al. 2022

Advances in Civil Engineering

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“…The composite ground has been widely used in ground improvement due to its convenience and efficiency [1][2][3][4][5][6][7]. A variety of pile techniques have been developed to meet various engineering needs, such as stone columns, deep mixing (DM) columns, T-shaped DM columns, jet grouted columns, and precast cement (PC) piles [8][9][10][11]. To give full play to merits of different pile techniques, the combined use of multiple pile techniques for soft soil ground improvement was developed [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…As for the granular column-improved composite grounds under various time-dependent loading, many analytical solutions have been proposed considering well resistance, smear effect, consolidation of stone columns, and several types of drained boundary [38][39][40][41][42]. The analytical methods for consolidation behaviors of impermeable pile-improved soft grounds also have been developed considering floating and penetrated piles, piercing into the gravel cushion, a partial drained boundary as well as the varying vertical stress increment with depth in subsoils [2,3,9]. In addition, the consolidation behaviors of the CCF improved by cohesive piles with prefabricated vertical drains have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Zhang

Liu

et al. 2023

Geofluids

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As the composite pile, the precast concrete piles reinforced with cement-treated soil (PCCS) is formed by driving the precast cement (PC) pile into the deep mixing (DM) column, which has been successfully and widely utilized to support buildings and embankments over soft soil. To increase the pile spacing and give full play to the economic merits of the PCCS, a reinforcement scheme, which involves the combined use of rigid piles and flexible columns, employing penetrated PCCSs and floating DM columns is proposed and utilized for soft soil ground treatment. However, there is a lack of feasible method for consolidation behaviors of this combined composite foundation (CCF) reinforced with penetrated PCCSs and floating DM columns under flexible loads. This paper developed an analytical solution to predict the average consolidation degree of this CCF based on a cylinder consolidation model and double-layer ground consolidation theory. The excess pore pressure and average consolidation degree were calculated by considering the composite pile penetration into the cushion. The analytical method agrees well with results obtained by numerical analysis. Additionally, a parametric study was conducted systematically to analyze the effect of key influence factors on the average consolidation degree of this CCF. The results indicate that the consolidation rate of this CCF can be much faster than that of the natural ground. The consolidation rate strongly depends on the compressive modulus and area replacement ratio of PCCSs. The increasing inner core-outer core modulus ratio and the inner core-subsoil modulus ratio increase the consolidation rate of this CCF. In addition, the consolidation rate increases with the gravel cushion-subsoil modulus ratio, while it decreases with the loading period.

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“…Until now, many researchers have studied on the consolidation of different types of column‐reinforced composite foundations, including permeable columns, 6–12 impermeable columns 4,13–16 . Due to the fact that composite foundation reinforced by combination use of permeable and impermeable columns is an emerging ground treatment technology, few types of research are available for its complexity.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, many researchers have studied on the consolidation of different types of column-reinforced composite foundations, including permeable columns, [6][7][8][9][10][11][12] impermeable columns. 4,[13][14][15][16] Due to the fact that composite foundation reinforced by combination use of permeable and impermeable columns is an emerging ground treatment technology, few types of research are available for its complexity. Considering the effect of pore water pressure on the volume variation in the permeable column, Yu et al 5 obtained analytical solutions for composite foundations incorporating permeable columns and impermeable columns.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for axisymmetric consolidation of unsaturated composite foundation incorporating permeable columns and impermeable columns

Gong

Qin

2022

Num Anal Meth Geomechanics

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Composite foundation is a widely used foundation treatment technology in geotechnical engineering. This study are derived governing equations to axisymmetric consolidation of unsaturated composite foundation (USCF) incorporating permeable columns and impermeable columns under instantaneous loading, and obtained the final solutions of excess pore pressures (EPPs) by using mathematical methods such as the variable separation, decoupling, finite Hankel transform and its inverse transform. The analytical solution obtained under free strain conditions is more general and representative, as it can be readily degraded to solutions for a variety of consolidation models and the EPPs can be conveniently calculated at any point in the calculation cell. Through degrading proposed solutions to the special case to verify their correctness, the comparative results were found well-matched to the existing literature solutions. The effect of various parameters on the consolidation performance of USCF was analyzed, where the studied parameters include the compression modulus of columns, radius ratio for permeable columns, and the number of impermeable columns. The results show that increasing the compression modulus and area replacement rates of columns can accelerate consolidation and reduce settlement, and the latter is more effective. Compared to reinforced composite foundations with only a single form of the permeable or impermeable column, the combination of permeable and impermeable columns can significantly shorten the consolidation time and enhance the bearing capacity of the unsaturated ground.

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A quasi-equal strain solution for the consolidation of a rigid pile composite foundation under embankment loading condition

Cited by 17 publications

References 26 publications

Settlement Characteristics of Split Grouting Pile Composite Foundation in Loess Areas

Settlement Characteristics of Split Grouting Pile Composite Foundation in Loess Areas

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Analytical solution for axisymmetric consolidation of unsaturated composite foundation incorporating permeable columns and impermeable columns

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