Soil compacting displacements for two jacked piles considering shielding effects

Luo, Zhiwei; Tao, Yanli; Gong, Xiaonan; Zou, Baoping

doi:10.1007/s11440-019-00911-w

Cited by 7 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Existing studies have pointed out the presence of a "shielding effect" during pile installation. Luo et al (2020) proposed a two-pile analytical model for soil displacement based on the shielding effect [33]. Zhou et al (2021) further investigated the response mechanisms of existing piles and of soil to the neighboring pile installation, and enhanced the analytical model for pile group responses based on the shielding effect [34].…”

Section: Introductionmentioning

confidence: 99%

Study on Shielding Effect of the Pile Group in a Soft-Soil Foundation

Lin,

Huang,

Chen

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Pile groups are frequently employed to reinforce soft soil foundations, while the piling process frequently disturbs the adjacent foundation. The shielding effect, which prevents the transmission of disturbances from pile installation, is indispensable for minimizing engineering disturbances and optimizing pile group construction techniques. However, current research focuses predominantly on characterizing the phenomenon of shielding, with a limited exploration of the mechanism. To eliminate the limitation, a numerical investigation of the shielding mechanism of pile groups in a pile–soil system is performed this study. Using the finite difference program FLAC3D and the cavity expansion theory, a three-dimensional numerical model of a pile–soil foundation was created. During the sequential penetration of piles, the response characteristics of the soil surrounding the piles were investigated. Displacement field was first investigated to determine the presence of shielding effects in the pile group and then highlighted the effective role of the existing piles in controlling deformation. Furthermore, through a combined analysis of the stress and strain fields during piling, the mechanism of the shielding effect induced by pile construction is proposed, which is attributed to the direct obstruction effect of piles and the “soil arching effect” created by the soil between piles. The former is reflected by the direct barrier of the existing pile to the soil displacement induced via the installation of the new piles. The latter is reflected by the obstruction of soil between two existing piles to the displacement of soil passing through the two existing piles. This research provides a comprehensive understanding of the mechanical behavior of the pile–soil system and has practical implications for controlling disturbances and optimizing construction techniques in piling engineering projects.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Shielding Effect of the Pile Group in a Soft-Soil Foundation

Lin,

Huang,

Chen

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…It induces changes in the mechanical properties of the soil, leading to an action of squeezing [1][2][3][4][5][6][7]. In the end, it may result in the displacement of piles, floating piles or even fractured piles, as well as uneven settling of neighboring structures and the cracking of pipelines [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Microstructure Evolution of Soil under Lateral Consolidation Compression

Zhang

Ding

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

Based on the lateral consolidation compression experiment of remolded soil simulating the effects of pile driving and soil squeezing, in this paper, the microstructures of soil with different degrees of lateral consolidation were investigated by a scanning electron microscope. Combined with Image-Pro Plus software to process data, parameters such as the equivalent diameter, porosity, circularity, directional frequency and fractal dimension of the soil microstructure were analyzed. The results demonstrate that the microstructure of the soil sample before consolidation was debris, aggregated particles and irregular flake aggregates. Following consolidation, the microstructure became a closed flake structure, where an obvious agglomeration phenomenon occurred. During the process of lateral consolidation compression, the large pore structure was more likely to be compressed and damaged, resulting in a decrease in the equivalent pore diameter and plane porosity, the approaching of circularity towards unity and an increase in the compaction and homogenization of soil with obvious directionality. Soil particles moved continuously under the action of consolidation compression to adjust the microstructure, and the fractal dimension gradually increased. Then, as consolidation compression continued, it gradually developed to a new equilibrium state, where the fractal dimension began to decrease and approach stability.

show abstract

“…Due to the crowding effect of jacking piles, the radial stress of the pile increases nonlinearly alongside the depth, and gradually converges to passive earth pressure [6]; the continuous disturbance of the soil around the pile during the jacking pile process leads to the "degradation phenomenon" of the radial stress of the pile, which is usually considered to be due to the "friction fatigue effect" at the pile-soil interface [7][8][9][10][11][12]. Meanwhile, there is a tendency for the loosening of shallow soil, and the densification of the deep soil surrounding the pile, during the piles' installation [13,14], which is due to pile rebound. Pile rebound leads to the release of the soil stress around the pile, which causes a significant reduction in the pile sides' friction resistance [15].…”

Section: Introductionmentioning

confidence: 99%

“…As we all know, the loosening of soil is a benefit to the installation of piles, while the densification of soil is detrimental to the installation of piles, but the tendency for the densification of soil is an advantage to the ultimate capacity of the piles during their installation [16][17][18][19][20][21]. In addition, the relationship between pile rebound and pile length is linear, and the ratio between pile rebound and pile length is constant [6,14]. With respect to the vertical bearing capacity characteristics of a jacked pile, some researchers believed that the ultimate bearing capacity of a jacked pile is correlated with the final pressure of the sunken pile, and the ultimate bearing capacity of a monopile increases nonlinearly with the increase in the pile length [22][23][24][25][26][27][28][29][30][31]; to improve the calculation accuracy of the bearing capacity of a hydrostatic pile, some scholars have also carried out theoretical research on the calculation of the monopile-bearing capacity of hydrostatic piles [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

The Effects and Vertical Bearing Capacity of Two Jacked Model Piles in Sand

et al. 2022

View full text Add to dashboard Cite

The effects and vertical bearing capacity of two jacked piles in sand are still not well understood, and the mechanism of the adjacent pile’s uplift caused by the jacking pile in a double pile system is especially unclear, but these facets are important to the stability of the jacked pile. In this paper, a series of tests is performed on jacked model piles in sand, where in the influences of the pile length and the driving pile’s speed on the effects and vertical bearing capacity of two jacked piles were studied. The results revealed that the effects and vertical bearing capacity of the two jacked piles were mainly in relation to pile length and influenced by the driving speed. The horizontal displacement of the top of the first jacking pile during the installation of the post-jacking pile was caused by the difference in the stress state of the first jacking pile between the side of the pile’s face and its back side, in which the uplift displacement of the first jacking pile was also involved. The radial stress of the pile increased nonlinearly with the depth under different pile lengths and gradually converged to the passive earth pressure. The ultimate capacity of the double pile is approximately twice that of a single pile, and the ratio of the ultimate capacity of a single pile to the final jacking pressure was approximately 1.04.

show abstract

Soil compacting displacements for two jacked piles considering shielding effects

Cited by 7 publications

References 19 publications

Study on Shielding Effect of the Pile Group in a Soft-Soil Foundation

Study on Shielding Effect of the Pile Group in a Soft-Soil Foundation

An Experimental Study on the Microstructure Evolution of Soil under Lateral Consolidation Compression

The Effects and Vertical Bearing Capacity of Two Jacked Model Piles in Sand

Contact Info

Product

Resources

About