Evaluation of capacity of power hammer machine foundation from high strain dynamic load test: Field test and axisymmetric numerical modeling

Rizvi, Syed Muhammad Faheem; Wang, Kuihua; Jalal, Fazal E.; Wu, Juntao; Dong, Ming; Tu, Yuan; Zhao, Shuang

doi:10.1016/j.trgeo.2022.100826

Cited by 6 publications

(3 citation statements)

References 44 publications

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“…Normal contact obeys ‘hard contact’ (Khalili et al, 2011), indicating that the contact constraint is applied when the clearance between two surfaces is zero and the contact surfaces will separate when contact pressure is equal to 0. The tangential contact behaviour is described by the friction coefficient between the pile and soil and is taken as

μ = italictan ((), φ)

(

φ

is the soil friction angle) (Rizvi et al, 2022). Roots are modelled with a decreasing diameter from the ground surface to the maximum depth, which play the role to reinforce the soil and transmit the wind load to the slope.…”

Section: Methods and Datamentioning

confidence: 99%

See 1 more Smart Citation

Elucidating the impacts of trees on landslide initiation throughout a typhoon: Preferential infiltration, wind load and root reinforcement

Zhuang,

Xing,

Petley

et al. 2023

Earth Surf Processes Landf

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Typhoon‐induced landslides are widespread, damaging and deadly. In this study, we elucidated their spatiotemporal features through investigations in Southeast coastal China and proposed a numerical model that involves typhoon wind load, preferential infiltration and root reinforcement. The wind load is calculated through a combination of the autoregressive method and a multi‐degree‐of‐freedom tree swaying mode, transmitting to the slope through the wind–tree interaction. Taproots of trees are modelled as piles, and root–soil interfaces are modelled as preferential infiltration boundaries. Using the numerical model, we quantitatively assessed the impacts of wind load, rainfall infiltration and root reinforcement on the slope stability and compared results with cases in Waipaoa and Wairoa (New Zealand). Results suggest that the impacts of trees depend heavily on meteorological and geological conditions. Trees play a destabilizing role in Southeast China during a typhoon but a stabilizing role in the cases in New Zealand. For slopes in Southeast China with a thick soil layer (>root depth), strong wind load and preferential flow resulting from root–soil interfaces, rather than slope surface infiltration, significantly decrease the slope stability in a short time. Slope failure occurred in all scenarios that account for the preferential infiltration, and its combination with a Force 14 typhoon wind load can fail the slope at 10 h after the typhoon initiation. Differently, tree roots in cases in New Zealand can penetrate through the thin soil layer (<1 m) and provide considerable additional resistance to stabilize the slope.

show abstract

μ = italictan ((), φ)

(

φ

Section: Methods and Datamentioning

confidence: 99%

“…ð Þ (φ is the soil friction angle) (Rizvi et al, 2022). Roots are modelled with a decreasing diameter from the ground surface to the maximum depth, which play the role to reinforce the soil and transmit the wind load to the slope.…”

Section: General Modelmentioning

confidence: 99%

Elucidating the impacts of trees on landslide initiation throughout a typhoon: Preferential infiltration, wind load and root reinforcement

Zhuang,

Xing,

Petley

et al. 2023

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…Nowadays, the commonly used non-destructive testing methods include the static load method [1], the high strain method [2], the low-strain method [3], and the ultrasonic method [4]. The static load method has a long detection period, insufficient equipment accuracy, and strong subjectivity of personnel; the high-strain method uses heavy hammer excitation but the detection steps are cumbersome, it is easy to damage the top of the pile, the detection cost is high and waveform analysis is unreliable.…”

Section: Introductionmentioning

confidence: 99%

Low-Strain Damage Imaging Detection Experiment for Model Pile Integrity Based on HHT

Jiang,

Wang,

Feng

et al. 2023

SDHM

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With the advancement of computer and mathematical techniques, significant progress has been made in the 3D modeling of foundation piles. Existing methods include the 3D semi-analytical model for non-destructive low-strain integrity assessment of large-diameter thin-walled pipe piles and the 3D soil-pile dynamic interaction model. However, these methods have complex analysis procedures and substantial limitations. This paper introduces an innovative and streamlined 3D imaging technique tailored for the detection of pile damage. The approach harnesses the power of an eight-channel ring array transducer to capture internal reflection signals within foundation piles. The acquired signals are subsequently processed using the Hilbert-Huang Transform (HHT), a robust analytical tool known for its effectiveness in handling non-stationary signals. Through the development of a sophisticated multi-channel ring array imaging algorithm, this technique empowers engineers and researchers to identify various pile defects, including their specific type, precise location, and obtain detailed 3D imaging representations. The findings of this research offer a valuable blend of theoretical insights and practical guidance, significantly advancing the state-of-the-art in the realm of concrete pile integrity inspection. By simplifying and enhancing the assessment process, this innovative approach not only addresses the complexities of existing methods but also contributes to the overall safety and reliability of concrete engineering structures.

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Insights into initiation of typhoon-induced deep-seated landslides in Southeast coastal China

Zhuang,

Xing,

Sun

et al. 2023

Nat Hazards

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Evaluation of capacity of power hammer machine foundation from high strain dynamic load test: Field test and axisymmetric numerical modeling

Cited by 6 publications

References 44 publications

Elucidating the impacts of trees on landslide initiation throughout a typhoon: Preferential infiltration, wind load and root reinforcement

Elucidating the impacts of trees on landslide initiation throughout a typhoon: Preferential infiltration, wind load and root reinforcement

Low-Strain Damage Imaging Detection Experiment for Model Pile Integrity Based on HHT

Insights into initiation of typhoon-induced deep-seated landslides in Southeast coastal China

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