Field Study on the Side Resistance-Softening and Resistance-Reinforcing Effects of Large-Diameter Combined Grouting Drilled Shafts

Hu, Tao; Dai, Guoliang; Wan, Zhaohui; Gong, Weiming

doi:10.3390/su14116835

Cited by 11 publications

(4 citation statements)

References 39 publications

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“…Various techniques for strengthening slopes include installing anchor cables [3], building antislip structures [4], improving the soil with chemical additives [5], and utilizing a confined-toone-region precise reinforcement approach based on the processes and instability modes of landslides [6]. One practical usage procedure for geotechnical construction is to install retaining structures, such as rigid retaining walls and antislide piles, to reinforce slopes [7].…”

Section: Introductionmentioning

confidence: 99%

Double-Row Pile Reinforcing on a Critical Slope at National Road in Tabanan, Bali

Munawir

2024

GEOMATE

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Due to heavy rain, a landslide occurred on the high slope at the National Road in Tabanan, Bali, and is forecasted to reoccur. Thus, the double-row piles will be analyzed as an alternative method to improve allowable bearing capacity (qa) and slope stability to mitigate this area. This study used various 2D and 3D numerical modeling techniques to analyze the slope model under two variables: the installment of parallel and nonparallel (zigzag) pile configurations and variations in a second-row pile diameter. With the smallest diameter (D = 0.3 m), the first row of piles has a diameter of 0.6 m and a pile spacing of (s) = 4D. The reinforcing piles were installed into the actual slope model. In addition, the second-row pile diameter varies from 0.3 to 0.6 m. Considering the standardized traffic load, PLAXIS and ABAQUS were implemented to numerically analyze the factor of safety (FS) and qa of the 2D and 3D finite element method (FEM). Compared with the unreinforced reinforcement of two rows of piles arranged in parallel, the FS increased significantly by 33.06% in the 2D FEM and 32.82% in the 3D FEM. Yet, the model with a zigzag configuration enhanced the FS by 33.20% in the 3D FEM. However, the numerical models showed a slight improvement in the qa in both 2D and 3D FEM. The slope model defined the highest FS and qa with pile diameter, D2 = 0.6 m (P2D1). Additionally, a rotational type of failure occurred on the slope toe.

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Section: Introductionmentioning

confidence: 99%

Double-Row Pile Reinforcing on a Critical Slope at National Road in Tabanan, Bali

Munawir

2024

GEOMATE

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“…Moreover, bearing capacity will decrease as a result of soil stress relaxation and bearing layer disruption during drilling [41,48]. A multitude of studies have demonstrated that post-grouting is a proficient solution for rectifying construction deficiencies and enhancing the load-bearing capacity of pile foundations [8,17,18,24]. Determining the carrying capacity is an important consideration in pile foundation design, and regulations require sampling inspection of the piles' carrying capacity [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Ou,

Sang,

Bai

et al. 2023

Preprint

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The study focuses on analyzing the bearing capacity of six cast-in-place drilled piles located in three distinct portions of the urban square at Ronghe East Station in Nanning was evaluated through static load testing using the Osterberg cell (O-cell) method, and the bearing deformation characteristics of post-grouting piles in heavily weathered mudstone stratum were analyzed. By fitting the resistance and relative displacement curves at the pile end and side, a load-settlement calculation method for post-grouting piles in a heavily weathered mudstone stratum was established by adopting the hyperbolic load transfer model, which has the tip hardening and the side softening. The accuracy of the method was verified through actual engineering test pile modeling and changed post-grouting piles' diameter and length to further examine their bearing properties. The bearing capacity exhibits a progressive increase with an increase in either the length or diameter of the pile. However, an effective length exists when the pile length is increased to increase the bearing capacity. The use of combined grouting technology can achieve a significant increase in bearing capacity, up to approximately 1.3 times, which can realize the economy and high efficiency of improving the bearing performance of pile foundations.

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“…The test results indicated postgrouting was a resource-intensive foundation treatment method that was also a critical technological means of achieving green and lowcarbon construction. Hu et al, 2022a proposed that it was unable to directly evaluate its construction quality and grouting consequences since the post-grouting technique took place underground. As a result, it was important to analyze and evaluate the changes in grouting parameters during the post-grouting process (Wan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of grouting parameters on pile-soil interaction of grouted piles

Shi,

Wan,

et al. 2023

Front. Earth Sci.

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Reasonable control of grouting parameters was the key to improving the pile-soil interaction. However, quantitative analysis on the effect of grouting parameters on the pile-soil interaction was still lacking. This article developed an intelligent post-grouting system for precise control and quantitative analysis of grouting parameters. The conventional preparation method for shear tests were improved in this article. By changing the normal stress of the pile-soil interface during grouting, the test sample could simulate the grout distribution of the pile-soil interface at different depths. Through the improved experimental methods, a more accurate analysis of the mechanism for the pile-soil interaction was achieved. And the effectiveness of the intelligent post-grouting system was further verified by the case application. The results indicated that increasing the grout volume could improve the interface shear strength when the normal stress and grouting pressure were constant. This improvement effect caused by increasing grout volume decreased when the normal stress was high. Increasing the grouting pressure increased the interface shear strength when the normal stress and the grout volume remained constant. This improvement effect caused by increasing grouting pressure decreased when the grout volume was small. By appropriately controlling the two grouting parameters, the cohesion and the shear strength of the pile-soil interface were increased by 5.8–18.8 times and 1.16–2.91 times, respectively. The results indicated that the intelligent post-grouting system could accurately control the grouting parameters and effectively improve the pile-soil interaction of bored piles. The intelligent post-grouting system effectively reduced geotechnical engineering risks and improved the bearing capacity of pile.

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Field Study on the Side Resistance-Softening and Resistance-Reinforcing Effects of Large-Diameter Combined Grouting Drilled Shafts

Cited by 11 publications

References 39 publications

Double-Row Pile Reinforcing on a Critical Slope at National Road in Tabanan, Bali

Double-Row Pile Reinforcing on a Critical Slope at National Road in Tabanan, Bali

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Analysis of the effect of grouting parameters on pile-soil interaction of grouted piles

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