Destructive field tests on mobilization of end resistance of cast-in-situ bored piles

Liu, Nian-wu; Zhang, Zhongmiao; Zhang, Qian‐qing; Fang, Kai

doi:10.1007/s11771-013-1586-8

Cited by 13 publications

(3 citation statements)

References 16 publications

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“…The technique of post-grouting primarily encompasses three methods: side grouting, tip grouting, and the simultaneous application of side and tip grouting. The use of the tip grouting technique was first implemented in 1958 and has since gained significant global utilization [2,4,5,12,13]. Side grouting includes circumferential grouting and longitudinal grouting, which can effectively increase the side resistance [9,23,37].…”

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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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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“…In recent years, large diameter mud wall protection bored pile (D ≥ 800 mm) has been widely used in pile foundation engineering such as expressway, railway, long-span bridge, and high-rise building, by virtue of its advantages of high bearing capacity, small deformation, convenient construction, etc., shown in engineering practice [1][2][3]. However, due to the high cost of damage test of rock-socketed cast-in-place pile and the difficulty of complete destructive test, the measured data of systematic and complete static load test are not much, which also restricts the comprehensive study of bearing capacity of rock-socketed cast-in-place pile with large diameter [4][5][6]. At present, many scholars have carried out a series of related researches on bearing characteristics and load transfer mechanism of cast-in-place pile and obtained beneficial results: Li et al [7] carried out two fullscale load tests on super-long bored cast-in-place piles, observed their field performance, and proposed a simplified method for nonlinear analysis of load-displacement of single pile.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Load Tests on Bearing Behavior of Large‐Diameter Bored Piles in Weathered Rock Foundation

Bai

Liu

Zhang

et al. 2020

Advances in Civil Engineering

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Based on the vertical compressive static load test and pile mechanics test of three large diameter bored piles (one of the test piles was treated with postgrouting) in granite gneisses foundation, the bearing capacity, deformation characteristics, and influencing factors of the single pile under the limit state are analyzed and compared with the recommended values of survey report and the recommended values of current codes. By comparing the measured and theoretical values of pile axial force, the bearing capacity of cast-in-place pile under normal and limit conditions is analyzed. The experimental results show that the Q-s curve of large-diameter rock-socketed mud wall retaining bored pile with a length-diameter ratio of 25–33 and rock-socketed depth of 5–8 d shows a rapid growth. After grouting treatment, the ultimate compressive bearing capacity of single pile is improved, the maximum settlement is reduced by 6.6%, the rebound rate is reduced by 11.1%, and the settlement effect of controlling pile top is not significant. The bearing capacity and deformation characteristics of the three test piles are less affected by length-diameter ratio and rock-socketed depth. For postgrouting piles, the ratio of frictional resistance of rock-socketed segment and the ratio of pile lateral resistance are less affected by length-diameter ratio and rock-socketed depth, while, for postgrouting piles, the ratio of pile lateral resistance is more affected by rock-socketed depth. The pile end resistance ratio of the three test piles is significantly affected by the rock-socketed depth, whether or not the pile side postgrouting treatment is carried out.

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“…In recent years, the axially loaded piles have attracted attention of many scholars. For axially loaded piles, various methods have been used, including field tests [1][2][3] and laboratory tests [4][5][6][7]. For the field tests, Zhang et al [8] examined the influence of the press pile on material strength, which can have positive impact on mobilizing the shaft resistance [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

Sun

Zhang

Yang

et al. 2020

Shock and Vibration

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When bridge construction has been completed, the temporary support system, such as a steel-pipe pile, is dismantled, and problems that are related to the steel-pipe piles pulling from the strata are encountered. It is difficult to measure the dynamic characteristics of the surroundings during the deep pile-pulling process. A numerical model of the pulling pile is established by using the discrete element method (DEM). A sinusoidal dynamic load is executed on the pile with various vibrational frequencies. The stress, bond, coordination number, porosity, and velocity field distribution of the surrounding soil during the pile-pulling process are studied. The results demonstrate that, during the pile-pulling process, the shearing state of the surrounding soil depends on the position of the pile. The number and area of bond fractures gradually increase, the coordination number decreases, and the porosity gradually increases when the pile-pulling distance increases. Under a vibrational load, the area that corresponds to particles with large velocity and displacement expands with the increase of the vibrational frequency. The major influence zone of the pile pulling on both sides is concentrated within 6dpile, which can be used to evaluate the safety of the existing bridge nearby during pile pulling.

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Destructive field tests on mobilization of end resistance of cast-in-situ bored piles

Cited by 13 publications

References 16 publications

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

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

Ultimate Load Tests on Bearing Behavior of Large‐Diameter Bored Piles in Weathered Rock Foundation

Dynamic Characteristics of the Surrounding Soil during the Vibrational Pulling Process of a Pile Based on DEM

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