Experiment on Improving Bearing Capacity of Pile Foundation in Loess Area by Postgrouting

Zhou, Zhijun; Xie, Yuan

doi:10.1155/2019/9250472

Cited by 7 publications

(5 citation statements)

References 47 publications

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“…In addition, the connection between the soil masses becomes tighter, and the internal friction angle of the soil becomes larger. Similarly, when using the large-scale triaxial test equipment, due to the existence of the circumferential surrounding rocks, the soil was compacted, so the void ratio was reduced, A high-rise building in Nanning Zhou [37] and the internal friction angle was increased, which resulted in the internal friction angle obtained from the large-scale indoor triaxial apparatus being larger than that obtained from the in situ test.…”

Section: Statistical Analysis Of the Recommended Values Of The Mechan...mentioning

confidence: 99%

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Yang,

Zhou

et al. 2023

Advances in Civil Engineering

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The silty fine sand and rounded gravel layers are widely distributed in Nanning City, China. Due to the low clay content, the silty fine sand and rounded gravel layers are prone to disturbance during sampling and transportation, which affects the shear strength test results. The reasonable determination of their shear strength is significant and imperative to the project. The rail transit project in Nanning is under large-scale construction. This work obtained the shear strength of the silty fine sand and the rounded gravel layers by conducting laboratory tests on undisturbed samples from deep foundation pits, combined with large-scale direct shear in situ tests. In addition, geotechnical investigation reports for typical projects in Nanning City were compiled, and the test data for the silty fine sand and the rounded gravel layers were comparatively analyzed using the empirical value. The results show that the shear strength test values of the fine sand layer are consistent with the current standard empirical values, and empirical values can be used for reference. The shear strength test value of the rounded gravel layer has significantly improved compared to the current standard empirical value, with a cohesion (c) value of 0–6.8 kPa and an increase in internal friction angle (φ) of 0%–12.5%. It is recommended to determine the shear strength of the rounded gravel layer based on the actual situation.

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Section: Statistical Analysis Of the Recommended Values Of The Mechan...mentioning

confidence: 99%

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Yang,

Zhou

et al. 2023

Advances in Civil Engineering

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“…Geißler [6] investigated compaction grouting for offshore pile foundations and found that the use of grouting significantly increased the load bearing capacity of the system of pile-grout. Zhou [7] performed experiments on enhancing the bearing capacity of pile foundations in the soil of loess area by post-grouting and found that the utilizing of post-grout considerably increased the pile load-bearing capacity. The use of jet grouting greatly increased the stability of the pile-grout system, according to numerical research [8] on the performance of jet grout piles for braced excavations in soft clay.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Pile-Grout System in Soft Clay under Vertical and Lateral Load

Qaddoory,

Noman,

Saleh

2023

E3S Web Conf.

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In this paper, a numerical investigation of the effects of grout parameters on the load response of concrete pile-grout systems in soft clay is presented. The study examines the influence of grout diameter and depth on the load bearing capacity of the pile under vertical and lateral loads. The research findings indicate that grouting can enhance the load bearing capacity of a single pile system by up to 27% under vertical loads and up to 51% under lateral loads, depending on the diameter and depth of the grout used. This is due to the grout's ability to fill voids in the soil and improve the soil-pile interface, resulting in better soil-pile interaction. Additionally, the study demonstrates that increasing the diameter and depth of grout leads to a larger treated soil area and subsequently an increase in load bearing capacity. Furthermore, the research indicates a linear relationship between the amount of grout material utilized and the increase in the load bearing capacity of the pile. The study concludes that grouting is an effective method for improving the pile performance systems, particularly in soft soil conditions. The results of the research are consistent with prior studies on the use of grout material to enhance the load-carrying capacity of pile systems.

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“…Because of the unique formation and geological conditions, loess soil is characterized by containing a great amount of randomly distributed macropores, strong particle bonding, and acute water sensitivity [1][2][3][4][5]. erefore, it is difficult to model the mechanical behavior of loess soil.…”

Section: Introductionmentioning

confidence: 99%

Disturbance Evolution Behavior of Loess Soil under Triaxial Compression

Guo

2020

Advances in Civil Engineering

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This paper presents an investigation into the evolution law of the structural effects of Xi’an loess soil, based on the disturbed state concept. First, a series of consolidated and drained triaxial compression tests were performed on undisturbed and remoulded loess samples prepared at five different moisture contents and tested at four different confining pressures. Second, two disturbance functions with different parameters were proposed to quantify mathematically the structural effects of loess. Finally, the proposed disturbance functions were validated against documented test results by other researchers. The results indicated that the single-parameter disturbance function, with the deformation modulus as its parameter, provides convenience for application but takes no account of the respective contributions of deviatoric stress and mean stress to the disturbance evolution behavior of loess. The double-parameter disturbance function, with the shear and bulk moduli as its parameters, is capable of distinguishing these respective contributions and reflects well the disturbance evolution behavior of loess under various moisture contents and confining pressures. The effects of moisture content and confining pressure on the parameters of the disturbance functions were found to be unsteady. The proposed disturbance functions lay the foundation for establishing a constitutive model for loess accounting for the structural effect.

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Experiment on Improving Bearing Capacity of Pile Foundation in Loess Area by Postgrouting

Cited by 7 publications

References 47 publications

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Research on Shear Strength Parameters of the Silty Fine Sand and the Rounded Gravel Layers in Nanning City

Numerical Analysis of the Pile-Grout System in Soft Clay under Vertical and Lateral Load

Disturbance Evolution Behavior of Loess Soil under Triaxial Compression

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