Numerical simulation of load tests on hollow-bar micropiles considering grouting method

Bayesteh, Hamed; Fakharnia, Mohammadali

doi:10.1680/jgeen.20.00049

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…(4) Numerical simulation research, which is primarily employed to study complex real-world conditions and verify test results. However, due to the challenges associated with accurately simulating the grouting effect, this approach is relatively less utilized [18,20,21]. (5) Grout diffusion research, encompassing investigations into the rheological and diffusion characteristics of cement grout, as well as the diffusion range in post-grouting [22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Post-Grouting Pile Vertical Bearing Performance Considering Different Grouting Methods and Parameters in Cohesive Soil

Zhang,

Zhao,

2023

Applied Sciences

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The selection of grouting methods and parameters significantly affects the improvement in the pile-bearing capacity of cast-in-place bored piles. This study proposes a comprehensive set of test methods for constructing model piles, performing grouting at the pile tip and pile side. A series of single-pile grouting and static load tests were conducted using these test methods. The results reveal that pile-side grouting is more effective in controlling pile settlement compared to tip grouting. Furthermore, tip-side-combined grouting exhibits superior reinforcement effects compared to the other two grouting methods. After grouting, a grout bubble is formed at the outlet, consisting of a compact diffusion zone internally and a split diffusion zone externally. Additionally, a vertical diffusion of grout occurs along the pile body, establishing a lateral friction resistance enhancement region. Within this region, the lateral friction resistance of the pile shows a negative correlation with the distance from the grouting outlet. The test results emphasize the significance of grouting volume and its impact on the bearing capacity, settlement control, lateral friction resistance, and grout bubble size in grouted piles, while the influence of variation in grouting pressure in a small range on bearing characteristics is not significantly apparent.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Post-Grouting Pile Vertical Bearing Performance Considering Different Grouting Methods and Parameters in Cohesive Soil

Zhang,

Zhao,

2023

Applied Sciences

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“…[26], Abdelhalim, Reda A. [1], Bayesteh, Hamed; Fakharnia, Mohammadali [2], Yao, Wenjuan [19], Wang, Zhong-Jin [16].…”

Section: Introductionmentioning

confidence: 99%

Finding reserves of bearing capacity of bored piles

Ushakova

2023

E3S Web of Conf.

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In recent years, due to population growth plans and accelerated economic development, high-rise buildings have become increasingly common in many cities and megapolises around the world. Due to the development of engineering construction, the type and technology of pile footing, which form the basis of such buildings, as well as the control of both single piles and a group of piles, have been significantly improved. At the same time, today the task of adequate assessment of the pile load capacity and justification of effective methods of revealing the reserves of its increase is actualized, because the manufacturing technology is constantly developing, in addition, often the functional purpose of the building itself, the type and intensity of the loads acting on it change. In view of the above, the purpose of the article is to investigate modern scientific- methodological approaches to search for reserves of bored pile load capacity. In order to carry out the study, the article used numerical methods for analyzing the stress-strain state of piles and means of the software package "Plaxis 3D Faundation". In the course of empirical experiments, it was found that the most acceptable results in the load testing of bored piles are given by the Shen method. Besides, the comparison of the results of static probing and static tests with theoretical calculations allowed to reveal the reserves of the actual pile load capacity, and also to determine on what parameters of its installation and characteristics the difference in load capacity depends more: the soil sciences in the pile base, pile diameter, pile length. Theoretical significance of the obtained results lies in the development of methodology for identifying reserves to increase the load capacity of bored piles. Conclusions have practical value that can be used in the process of laying the foundation of high-rise buildings to optimize the number and geometry of pile placement taking into account the reserve of their bearing capacity.

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“…A number of academics [1,23,24,43] have conducted a series of in-depth explorations and research on postgrouting piles and conducted numerical simulations to investigate the load-bearing characteristics of grouted piles.…”

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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Numerical simulation of load tests on hollow-bar micropiles considering grouting method

Cited by 8 publications

References 30 publications

Experimental Study on Post-Grouting Pile Vertical Bearing Performance Considering Different Grouting Methods and Parameters in Cohesive Soil

Experimental Study on Post-Grouting Pile Vertical Bearing Performance Considering Different Grouting Methods and Parameters in Cohesive Soil

Finding reserves of bearing capacity of bored piles

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

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