Calibration of Mobilized Soil Strength During Installation of Suction Piles

2006 ◽  
Author(s):  
E. C. Burg ◽  
B. A. Frankl ◽  
L. M. Metz ◽  
S. Bang
Keyword(s):  
Soil Strength ◽  
Suction Pressure ◽  
Lateral Loads ◽  
Dimensional Parameter ◽  
Pile Installation ◽  
Strength Variation ◽  
Pile Penetration ◽  
Southern Korea

An innovative breakwater system has been introduced for use in areas with thick soft seafloor, utilizing suction piles as the foundations. Gravity-type concrete caissons are placed on top, which resist the lateral loads caused by the wind and waves to protect the harbor behind. In Dec. 2004, four large concrete suction piles were prefabricated and installed successfully in southern Korea. During the installation of suction piles, detailed measurements were made on one pile, including the suction pressure vs. pile penetration relationship. They were used to estimate the mobilized soil strength during the suction pile installation. The calculated mobilized soil strength variation was then expressed as a function of a non-dimensional parameter that included the most essential parameters governing the behavior of suction piles during installation.

Transition of soil friction during suction pile installation

2002 ◽  
Vol 39 (5) ◽  
pp. 1118-1125 ◽  
Author(s):  
Y Cho ◽  
S Bang ◽  
T Preber
Keyword(s):  
Soil Properties ◽  
Friction Angle ◽  
Soil Strength ◽  
Model Tests ◽  
Laboratory Model ◽  
Suction Pressure ◽  
Pile Installation ◽  
Nondimensional Parameter ◽  
Pile Penetration ◽  
The Relationship

A series of laboratory model tests on the suction pile installation in sand have been conducted to obtain the relationship between the applied suction pressure inside the pile and the resulting pile penetration. The relationships have been used to estimate the mobilized soil strength during the pile installation. This reduction in the soil strength due to the applied suction pressure is described as a function of a nondimensional parameter to characterize the variation and transition of the soil strength during the pile installation. The nondimensional parameter includes all pertinent pile and soil properties that are thought to affect the behavior of the suction pile during installation.Key words: suction pile, suction pressure, mobilized effective soil friction angle.

Development of cyclic p–y curves for laterally loaded pile based on T-bar penetration tests in clay

2016 ◽  
Vol 53 (10) ◽  
pp. 1731-1741 ◽  
Author(s):  
Teng Wang ◽  
Wenlong Liu
Keyword(s):  
Test Data ◽  
Soil Strength ◽  
Lateral Loads ◽  
Degradation Model ◽  
Model Based ◽  
Curve Model ◽  
Bar Test ◽  
Plastic Displacement ◽  
Cyclic Degradation ◽  
Laterally Loaded

Offshore pile foundations are always subjected to cyclic lateral loads, which can result in the remolding and softening of the surrounding seabed soil. Cyclic T-bar penetrometer testing provides a rapid and effective method for assessing the remolded shear strength. It is widely believed that the soil strength degrades with the accumulation of plastic strain, but the strain cannot be measured. Numerical analysis described in this paper shows that the accumulated plastic displacement of the T-bar in a cyclic range of two diameters is approximately equal to its accumulated displacement. By using T-bar test data, a cyclic degradation model based on the accumulated (plastic) displacement is developed to describe the soil strength degradation at a given depth. Furthermore, an improved p–y curve model based on the cyclic degradation model is proposed to estimate the lateral response of pile under cyclic loads. The improved p–y curve model was embedded into the OpenSees program to investigate the cyclic lateral responses of soil elements and the pile. A case study was conducted to verify the improved p–y curve model by comparing it with published centrifuge experiment data. Results indicate that the improved p–y curve model based on T-bar test data is highly precise and practicable.

Field Tests on Suction Pile Installation in Sand

2002 ◽  
Author(s):  
Y. Cho ◽  
T. H. Lee ◽  
J. B. Park ◽  
D. J. Kwag ◽  
E. S. Chung ◽  
...  
Keyword(s):  
Pore Water ◽  
Applied Pressure ◽  
Field Tests ◽  
Soil Condition ◽  
Silty Sand ◽  
Detailed Measurement ◽  
Pile Installation ◽  
Pile Penetration ◽  
Pore Water Pressures

A series of field suction pile installation tests have been conducted inside the Onsan harbor located in southeastern Korea during the summer of 2001. The suction piles were made of steel, having inside diameters ranging from 0.5 meters to 2.5 meters and the length of five meters. The seafloor soil condition at the site is predominantly silty sand. Instrumentation includes the detailed measurement of the applied pressure vs. pile penetration and retrieval length relationships; the pile alignment during installation through a tiltmeter; and the pore water pressures both inside and outside the pile.

Discrete-continuum analysis of monotonic pile penetration in crushable sands

2014 ◽  
Vol 51 (10) ◽  
pp. 1095-1110 ◽  
Author(s):  
Jianfeng Wang ◽  
Budi Zhao
Keyword(s):  
Soil Mechanics ◽  
Computational Cost ◽  
Underlying Mechanism ◽  
Particle Breakage ◽  
Full Field ◽  
Pile Installation ◽  
Pile Penetration ◽  
Tip Resistance ◽  
Strain Paths

This paper presents numerical results from a two-dimensional discrete element method (DEM) simulation study on the monotonic pile installation in crushable sands. The particle breakage was included in the model by setting a crushable zone around a pile that was filled with parallel-bonded agglomerates. In the other part of the model, rigid, unbreakable particles are used to minimize the computational cost. Parametric studies were carried out to examine the effects of initial in situ vertical stress, soil void ratio, and particle crushability on the penetration resistance behavior. The validity of the DEM model was examined by comparing the simulation data with published results from laboratory centrifuge and calibration chamber tests on model pile installation. A variety of DEM analysis techniques were employed to make a detailed discrete-continuum study on the pile penetration mechanisms, particularly on the particle breakage-related soil mechanics incurred during the penetration process. Simulation results show that the in situ stress and particle breakage are the two competing factors dominating the tip resistance behavior. The underlying mechanism was elucidated through the analysis of stress and strain paths derived from pre-assigned sampling windows and their full-field distributions.

Application of Friction Fatigue Pile Driving Models in GRLWEAP

2019 ◽  
Author(s):  
Henry Milewski ◽  
Justin Kennedy
Keyword(s):  
Pile Driving ◽  
Analysis Software ◽  
Dynamic Nature ◽  
Depth Of Penetration ◽  
Pile Installation ◽  
Pile Penetration ◽  
Driving Time ◽  
Suitable Form ◽  
Side Friction ◽  
Crucial Part

Abstract Pile driveability analyses play a crucial part in pile installation planning (hammer sizing, anticipated driving time) and pile design (fatigue concerns). GRLWEAP is one of the predominant pile driving analysis software tools used globally. Traditionally, the offshore community has often wished to use specific SRD prediction methods in driveability analyses. Some of the most popular of these methods (e.g. Alm & Hamre, 2001) employ a ‘friction fatigue’ approach whereby side friction reduces with increasing pile penetration. A past limitation in GRLWEAP has been that friction fatigue methods could not be used in a full driveability analysis, since only a single SRD (valid only for a particular depth of penetration) can be input. This is prohibitive when outputs such as blowcounts are desired at each intermediate penetration depth (e.g. for fatigue analysis), rather than just the final depth. With the introduction of GRLWEAP’s ‘friction fatigue’ module, a way of modelling friction fatigue is now provided, but the fatigue equations are formulated in a specific way that may not be directly applicable to various friction fatigue approaches. Using the Alm & Hamre (2001) friction fatigue method as an example, an approach is presented that shows how friction fatigue models that are not formulated in the same manner as GRLWEAP’s friction fatigue approach can be converted into a suitable form to allow full implementation in a GRLWEAP driveability analysis. This enables driveability analyses to capture the dynamic nature of the SRD as pile penetration increases, producing results that are valid for all penetrations and circumventing the need for alternative workarounds to capture friction fatigue. The general principles presented herein may be modified on similar principles for other friction fatigue models not explicitly captured within GRLWEAP.

The epidemiological studies on the filariasis in Korea II. Distribution and prevalence of malayian filariasis in southern Korea

1968 ◽  
Vol 6 (3) ◽  
pp. 132 ◽  
Author(s):  
Byong Seol Seo ◽  
Han Jong Rim ◽  
Young Chan Lim ◽  
Il Kwon Kang ◽  
Young Ok Park
Keyword(s):  
Epidemiological Studies ◽  
Southern Korea

Effect of Pile and Load Inclination on the Pile Resistance In both Compression and Tension

2014 ◽  
Vol 2 (1) ◽  
pp. 11-29
Author(s):  
Ahmad Jabber Hussain ◽  
Alaa Dawood Salman ◽  
. Nazar Hassan Mohammad
Keyword(s):  
Bearing Capacity ◽  
Inclination Angle ◽  
Theoretical Study ◽  
Pile Installation ◽  
Soil Failure ◽  
Inclined Pile ◽  
Uplift Resistance ◽  
Lift Forces ◽  
Batter Piles ◽  
Pile Resistance

      According to this theoretical study which was about loading of piles under different condition of loading (compression and up-lift forces ) and for deferent pile installation (vertical and inclined pile ) by which it called (positive batter pile ) when the inclination of the load and pile is in the same direction and called (negative batter pile) when the inclination of load is opposite to the pile inclination, and from studying these cases the results of analysis can be summarize in the flowing points: 1-Variation of load inclination on piles effects on the bearing capacity and uplift resistance. It was found that bearing capacity of the piles increase with increasing of load inclination up to the inclination angle (37.5ͦ) which represents the maximum bearing capacity and then the bearing capacity decrease with increasing of load inclination. 2- Variation of batter pile affects the bearing capacity of the pile and up-lift resistance. by which equivalent angle will be used as result between the load and piles inclination and this angle will be used in calculation of piles resistance . 3- It was noticed the shape of soil failure is highly affected by the inclination of pile. The shape of failure for the soil which is in contact with pile and this include (vertical and batter piles) is highly affected by the angle of inclination.

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