Influence of micropile parameters on bearing capacity of footings

Malik, Bilal Ahmad; Shah, Mohammad Yousuf; Sawant, V. A.

doi:10.1007/s11356-021-14062-7

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…This indicates that the transfer of lateral friction resistance increases gradually from top to bottom. As shown in Figure 10, at the ultimate load, Part 3 exhibits the highest average lateral friction resistance (45-63 kPa), followed by Part 1 with a slightly lower average lateral friction resistance (21-33 kPa), and Part 2 shows the lowest average lateral friction resistance (11)(12)(13)(14)(15)(16).…”

Section: Experimental Loading Process and Results Analysismentioning

confidence: 99%

“…This approach enables a comprehensive analysis, encompassing multiple influencing factors. As micropile technology continues to advance, several studies have underscored the significant impact of various parameters, including soil density and installation methods, on the load-bearing characteristics of micropiles [13,14]. The soundness and feasibility of micropile construction techniques are paramount for the successful execution of engineering projects.…”

Section: Introductionmentioning

confidence: 99%

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Horizontal and Uplift Bearing Characteristics of a Cast-In-Place Micropile Group Foundation in a Plateau Mountainous Area

Li,

Ren

2023

Sustainability

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Micropile groups have been progressively more frequently adopted in the construction of transmission tower bases due to their compact size and flexible construction advantages. However, the load-bearing characteristics and deformation mechanisms of micropile groups are complex, and the study of their coupling effects under combined loads remains unclear. Consequently, this paper presents a field static load test of micropile groups in a highland mountainous area. The analysis encompasses the axial force distribution and load-sharing ratio of micropiles. With a focus on micropile groups subjected to both uplift and horizontal combined loads, the coupled effects under different load combination ratios are examined using numerical simulation methods. The key findings are as follows: During the uplift loading process, the load distribution among individual piles is relatively uniform, with lower side friction resistance gradually coming into play to counterbalance the top load. The load–uplift displacement curve exhibits a steep characteristic, making it susceptible to sudden failure in practical engineering applications. Under the simultaneous action of uplift (V) and horizontal (H) loads, the unbalanced lateral frictional resistance on both sides of the pile segment induces additional bending moments, which is an important part affecting the load-coupling mechanisms. The uplift resistance capacity of micropile groups decreases with an increase in horizontal load, while the horizontal load-carrying capacity initially decreases and then increases with an increase in uplift load. The space enclosed by the yield envelope under combined load, and the vertical line of the ultimate load, is divided into a ‘failure zone’ and a ‘safety zone.’ In the design of the pile foundation, the uplift bearing capacity reduced by the ‘failure zone’ should be taken into account.

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Section: Experimental Loading Process and Results Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Horizontal and Uplift Bearing Characteristics of a Cast-In-Place Micropile Group Foundation in a Plateau Mountainous Area

Li,

Ren

2023

Sustainability

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“…The results of diameter enlargement also affect the decrease in bending moment (Juran et al, 2001), increase in efficiency and maximum load (Gogoi et al, 2014;Sharma et al, 2019), as well as increase in bearing capacity (Haghighy, 2017;Malik et al, 2021;Fan et al, 2020).…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Micro-Pile Mitigation on Seismic Performance of Liquefiable Ground

Asokawati,

Fansuri,

Chang

et al. 2023

jcef

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Soil liquefaction and its associated ground failures, pose a significant threat, causing damage to engineering structures during earthquakes, and one of the most effective methods used to mitigate liquefaction in liquefied soil is micro-pile (MP) method. Therefore, this study aims to examine the current state of MP method as liquefaction countermeasure in the soil of the Coal Fired Power Station in Central Java, an area with a high liquefaction potential. A three-dimensional finite element analysis, conducted with OpenseesPL software, uses a numerical method to yield information about ground lateral deformation and excess pore pressure generation caused by MP method during seismic shaking. This result examines important design parameters, including diameter, spacing, length of MP, and inclination of ground, to address these issues. MP method increases the stiffness of soil, reducing excessive pore pressure and thereby minimizing liquefaction risks. In general, MP remediation appeared effective for any sloping ground. This study provides valuable information for devising an efficient remediation solution by comparing relevant variables, such as diameter, spacing, MP length, and ground inclination, under the same conditions. Numerical simulation with OpenseesPL yields results such as stress and strain path, acceleration time histories, excess pore pressure, displacement time histories, and maximum lateral displacement, which are then compared with various diameter parameters. The diY6-ameter parameters were compared to test how the additional diameter dimension affects the performance of the micropile provided to the soil. This will be demonstrated based on the results shown on excess pore pressure and maximum lateral displacement. This comparison shows that increasing MP diameter is more effective in reducing the risk of liquefaction.

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“…However, the advantage of micropiles, which can be installed in small construction spaces, may diminish when installed in groups. On the other hand, to enhance horizontal bearing capacity, research has explored the installation of inclined micropiles, which improved seismic performance [20,23,24]. However, the installation of inclined micropiles is constrained by the presence of adjacent structures, limiting their use to urban areas or tight spaces for existing building reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Enhanced Load-Bearing Capacity of Expanded Steel Pipe Piles Considering Optimal Configuration

Park,

Kim,

Park

et al. 2024

Preprint

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Recently, advanced types of micropiles have been developed to enhance their load-bearing capacity, responding to increased demands for micropile applications. However, these improved micropiles present challenges for rapid construction within confined spaces due to construction complexities. This study introduces an expanded steel pipe pile, which not only offers improved load-bearing capacity but also facilitates rapid construction in limited spaces. The expanded steel pipe pile is created by expanding a pre-installed small-diameter steel pipe at specific intervals to form shear keys along the length of the pile. In this study, the potential for enhancing the load-bearing capacity of the expanded steel pipe pile was initially verified through preliminary numerical analyses. Subsequently, comprehensive field experiments were carried out comparing two traditional micropiles with two expanded steel pipe piles, each installed using different methods. The results showed that the expanded steel pipe piles had up to 1.4 times the allowable bearing capacity of conventional micropiles. Finally, utilizing the numerical model validated by the field experiment results, the optimal configuration for the expanded steel pipe pile was provided. Considering both load-bearing efficiency and constructability, it was concluded that the expanded steel pipe pile should have a post-expansion diameter of 360 mm (with a deformation ratio of 13%) or less and incorporate at least three shear keys.

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Influence of micropile parameters on bearing capacity of footings

Cited by 16 publications

References 22 publications

Horizontal and Uplift Bearing Characteristics of a Cast-In-Place Micropile Group Foundation in a Plateau Mountainous Area

Horizontal and Uplift Bearing Characteristics of a Cast-In-Place Micropile Group Foundation in a Plateau Mountainous Area

Effect of Micro-Pile Mitigation on Seismic Performance of Liquefiable Ground

Assessment of Enhanced Load-Bearing Capacity of Expanded Steel Pipe Piles Considering Optimal Configuration

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