Axial Monotonic and Cyclic Testing of Micropiles in Loose Sand

Matos, Rui; Pinto, Pedro; Rebelo, Carlos; Veljković, Milan; Silva, L. Simões da

doi:10.1520/gtj20160284

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…Few test and experiment studies were implemented in mirco-steel tubular piles refilled concrete. For estimating the mechanical behavior on micro steel tubular piles refilled concrete in higher density sand, 36 real-scal tests of micro-steel tubular piles refilled concrete were conducted on 3-m-long piles, three different spacings, both while isolated and in 2 by 2 groups [7]. Some model tests of mirco-steel tubular piles refilled concrete were carried out to estimate some reinforced effect on building foundation.…”

Section: Testing Methodmentioning

confidence: 99%

“…The results from test in-situ and finite element analysis were shown as figure 1. According to the test in-situ standard, the calculation of number simulation analysis (2503.2kN) was smaller than the test result(2600kN), the error of 3.7% was less than the error of 13.5% from the reference [7](Chen shaobo,2016).The reasons for error were that the analysis model of finite element analysis didn't included the compaction function of soil-pile and the errors of material parameters.…”

Section: Bearing Capabilitymentioning

confidence: 96%

“…The result of number simulation method might be verified by A site test. An example for mirco-steel tubular pile infilled concrete was presented to verified the finite element method and referred to the studied from reference [7]. (Chen shaobo,2016) .…”

Section: Verification On Number Simulation Analysismentioning

confidence: 99%

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Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Yong-kang

Zhong

Xiong

2022

J. Phys.: Conf. Ser.

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Steel tubular pile technology is an effective method to reinforced foundation in retrofitting of existing buildings. Mirco-steel tubular pile is constructed with concrete filled steel tubular, the infilled concrete could reinforced the strength of mirco-pile and prevented the local-buckling of steel tubular. According to ANSYS software, a mode of finite element analysis was built with some function between mirco-pile and soil foundation, the mode was confirmed by some test data. The slenderness ratio and material strength were two important factors for the bearing capability of mirco-pile with concrete filled steel tubular. The bearing capability and some influence factors on concrete filled mirco-steel tubular piles were analyzed by factors analysis method. The mode of finite element analysis and factors analysis method on were applied for reinforced building foundation and referred to other application of concrete filled steel tubular.

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Section: Testing Methodmentioning

confidence: 99%

Section: Bearing Capabilitymentioning

confidence: 96%

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Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Yong-kang

Zhong

Xiong

2022

J. Phys.: Conf. Ser.

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“…Plenty of experiments have been performed to explore the cyclic behaviors of piles under cyclic loading. Concerning sand, interesting results are reported by Poulos [2], Al-Douri and Poulos [3], Gavin and O'Kelly [4], Jardine and Standing [5], Blanc and Thorel [6], and Matos et al [7]. In most of these studies, significant degradation in the shaft capacity was observed when the piles were subjected to limited cycles (hundreds or thousands of cycles) under large cyclic loads (the cyclic amplitude > 50% of the ultimate capacity).…”

Section: Introductionmentioning

confidence: 93%

Settlement and Capacity of Piles Under Large Number of Cyclic Loads

Chen

Peng

Wang

et al. 2021

Lecture Notes in Civil Engineering

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This study reports a group of field tests on cyclically loaded piles installed in soft clay in Huzhou, China. Two 29.5 m long pipe piles were instrumented with transducers to measure the accumulated settlement at the pile-head, the pore water pressure and total pressure at the pile-soil interface, and axial load at the pile end, respectively. The major objective of the field testing is to gain a better understanding of the evolution of the pile-head settlement and the effective stress at the pile-soil interface. The results of cyclic loading tests under different combinations of static load and cyclic load are discussed with reference to changes in the pile capacity, the permanent settlement, and the radial stresses. It is found that the permanent settlement of piles can be characterized as quickly stabilized (QS), progressively developing (PD), and dramatically failed (DF) patterns. Under low-level loading (QS pattern), the pile-shaft earth pressure is nearly undisturbed, final gains in effective stress are observed due to slight dissipation of pore pressure. For intermediate-level loading (PD pattern), significant reductions in pore pressure, earth pressure, and effective stress are observed after cyclic loading. Regarding high-level loading (DF pattern), the quick accumulation of pore water pressure leads to a slight increase in earth pressure, resulting in a continuous decrease in effective stress.

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“…The design guidelines for micropiles are often used for projecting the practical performance of minipiles, due to the similar characteristics of the two. There is extensive literature on static lateral [45,48] and static and cyclic compressive and pull-out behaviour of micropiles [17,29,59,57]. However, there is only limited literature on the behaviour of micropiles under cyclic lateral loading.…”

Section: Introductionmentioning

confidence: 99%

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Mondal

Disfani

2022

Acta Geotech.

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This experimental study investigates the response of vertical and battered minipiles to two-way symmetrical low-frequency (0.1 Hz) cyclic lateral loading. Laboratory (1-g) tests were performed on scaled-down minipiles in very dense cohesionless soil, for batter angles of 0°, 25° and 45°. The cyclic loading is classified into two categories: multi-amplitude and long-term single amplitude, where force-controlled load was applied at a constant frequency. The minipiles were instrumented with optic fibres, and strain profiles were obtained at each loading stage, in both compression and tension stroke. The results are presented in terms of hysteresis loops, variation of normalised stiffness, minipile strain and bending moments under cyclic loading. In the multi-amplitude loading category, backbone curves show a stiffer force–displacement response in tension stroke than in compression stroke. For the single-amplitude category, the area of the hysteresis loop is largest for 45° battered minipiles with the lowest accumulated deformation. The normalised stiffness at the end of 50 cycles is highest for 25° minipiles with a value slightly greater than one. The strain profiles along the minipiles show stabilisation of measured strain before the number of cycle reaches 50, for all three battered conditions. A multi-surface hardening constitutive model is used to explain the effect of shearing and cyclic loading, with increasing loading amplitude on 25° battered minipiles. These test results are indicative of better performance capability of 25° battered minipiles, in terms of secant stiffness, compared to the vertical and 45° battered cases.

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Axial Monotonic and Cyclic Testing of Micropiles in Loose Sand

Cited by 10 publications

References 13 publications

Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Finite Element Analysis on Mirco-Steel Tubular Pile Refilled Concrete Reinforced Structure Foundation

Settlement and Capacity of Piles Under Large Number of Cyclic Loads

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

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