scholarly journals Development Study of T-Z Curve Generated from Kentledge System and Bidirectional Test

UKaRsT ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Nisa Utami Rachmayanti ◽  
Paulus Pramono Rahardjo
Keyword(s):  
Skin Friction ◽  
Test Methods ◽  
Load Test ◽  
Primary Data ◽  
Pile Test ◽  
Bored Pile ◽  
Loading Tests ◽  
Pile Load Test ◽  
Result Analysis ◽  
Z Curve

Pile loading tests to check the bearing capacity to support large loads. We can also use it to measure its deflection under lateral load.  There  are  two  tests:  the  axial  static  pile  load  test (Kentledge)  and  the  two-directional  static  pile  load  test (Bidirectional).  T-Z  curve  as  the  result  analysis  based  on  the instrumented  pile  test  data  describes  the  load  distribution  and mobilized skin friction along with the pile. Numbers of Vibrating Wire  Strain  Gauge  (VWSG)  mounted  in  several  depths  of  the bored  pile  and  two  tell-tale  on  top  and  toe  of  the  pile  used  as primary  data  in  this  research.  This  research  to  determine  the different  distribution  of  mobilized  skin  friction.  The  pile  from two different pile load test methods from the calculated t-z curve as  the  study  developed  from  both  methods  of  pile  test.  The research results that the kentledge system has bigger mobilized skin friction than in bidirectional test.

Geotechnical Investigation, Field Load Test and Analysis of Full-Scale Bored Pile

2015 ◽  
Vol 813-814 ◽  
pp. 1126-1130
Author(s):  
G. Kesavan ◽  
S.S. Chandrasekaran
Keyword(s):  
Tamil Nadu ◽  
Ground Level ◽  
Maximum Load ◽  
Field Investigation ◽  
Complex Problem ◽  
Load Test ◽  
Bored Pile ◽  
Economical Design ◽  
Pile Load Test ◽  
A Site

The maximum load carrying capacity of bored piles is a complex problem because it is a function of a number of factors, these factors include methods of soil exploration, ground water condition, types of grading of concrete, quantity and quality of concrete. The knowledge of Geotechnical test is important for the most economical design of the piles. This paper describes some important aspects of field investigation, design and construction of in-situ bored pile foundation, field pile load test of experience gained from the construction of the pile at a site in Aathoor in Tamil Nadu, India. The site was fully sandy soil from existing ground level. The design of bored pile under axial compression was done using Empirical formula, pile load test and by using PLAXIS 2D software. Results were compared with vertical load and settlement in this site.

A Destructive Field Study on the Behavior of Pile under Ten

2010 ◽  
Vol 163-167 ◽  
pp. 4524-4528
Author(s):  
Shi Min Zhang ◽  
Gang Wei
Keyword(s):  
Skin Friction ◽  
Load Test ◽  
Silty Sand ◽  
Silty Clay ◽  
Test Results ◽  
Bored Pile ◽  
Tip Resistance ◽  
Stress States ◽  
Sand And Gravel ◽  
Different Soils

This paper involves a destructive full-scale load test on long bored pile instrumented with strain gauges along the shaft. The load-displacement response, the distribution of axial force, and the thresholds of displacement for fully mobilizing the skin resistances in different soils in tension case were discussed in this paper. The field test results show that the measured tip resistance in the pile under tension is near zero during the whole loading, and the softening is accompanied with a reduction in skin friction when the skin friction is fully developed. It also can be investigated that the threshold of displacement for fully mobilizing skin friction is different even if in the same soil type due to different soil stress states. Generally speaking, the thresholds of relative pile-soil displacement for fully mobilizing skin frictions in the sandy silt, silty sand mixed silt, silty clay, silty clay mixed sand and gravel are about 4 mm, 11 mm, 7 mm, 6 mm, and 5.5 mm, respectively.

Skin Friction of Taper-Shaped Piles in Sands

2009 ◽  
Author(s):  
Suman Manandhar ◽  
Noriyuki Yasufuku ◽  
Kazutaka Shomura
Keyword(s):  
Skin Friction ◽  
Confining Pressure ◽  
Load Test ◽  
Main Theme ◽  
Ground Model ◽  
Depth Of Penetration ◽  
Tapered Pile ◽  
Different Types ◽  
Pile Load Test ◽  
Free Falling

The main theme of this paper is to evaluate the skin friction and unit skin friction of different types of pile on a defined model ground. The typical silica sands were selected to make model ground at high relative densities of 80% and 60% respectively at confining pressure of 50 kPa to perform the pile load test on selected two different model ground. Model ground has been prepared by free falling of sand through sieve on the chamber to meet the required relative densities. Relative densities have acquired after evaluating desired height and area of nozzle through which dry sands fall. To fulfill the requirement, different types of tapered piles were selected to perform the pile load test. Straight and different types of tapered pile have driven in silica sands respectively at relatively high densities. Experimental results have showed that the skin friction of straight pile is considerably low with compared to tapered pile and wedging effects can be clearly seen towards the depth of penetration. In conclusion, it is clearly seen that the skin friction of tapered pile can be improved with increasing tapering angles. Higher the angle the greater the skin friction. Further, lateral stresses around the pile increases laterally during loading. Lateral stresses are increased with increase on amounts of pile expansion. The skin frictions of tapered piles have pressing effect and soil tamping effect.

scholarly journals Full-Scale Well Instrumented Large Diameter Bored Pile Load Test in Multi Layered Soil: A Case Study of Damietta Port New Grain Silos Project

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
M. Eid ◽  
A. Hefny ◽  
T. Sorour ◽  
Y. Zagh
Keyword(s):  
Load Distribution ◽  
Large Diameter ◽  
Soil Layer ◽  
Full Scale ◽  
Layered Soil ◽  
Load Test ◽  
Test Field ◽  
Loading Test ◽  
Bored Pile ◽  
Pile Load Test

A Large diameter bored pile with diameter of 1.00 m and length of 34.00 m has been implemented in multi layered soil. The pile was tested under three axially loading and unloading cycles, in order to determine the load settlement curve and assess the ultimate pile capacity. Extensive investigation was carried out to obtain reliable soil properties at the examined pile location, through in situ and laboratory soil tests. Twelve strain gauges were fixed on pile steel reinforcement bars at top of each soil layer level. Moreover, four dial gauges were set up at pile head. Also, three telltales were extended to three different levels inside the pile. The pile load test field measurements are presented in the form of load settlement and load distribution curves for different loading steps. In addition, the pile ultimate capacity is calculated using different codes criterions and compared with the loading test results. Large diameter bored pile, Settlement, Pile load distribution, Pile installation, Instrumentation, Full scale pile load test, Pile behavior.

scholarly journals Laboratory Research of Toe Resistance Based on Static Pile Load Tests in Different Schemes

2018 ◽  
Vol 28 (1) ◽  
pp. 172-181 ◽  
Author(s):  
Krzysztof Żarkiewicz
Keyword(s):  
Skin Friction ◽  
Applied Load ◽  
Load Transfer ◽  
Load Test ◽  
Laboratory Research ◽  
Load Tests ◽  
Pile Load Test ◽  
Friction Curve ◽  
Pile Load Tests ◽  
Surrounding Soil

Abstract Transfer of axial force from the head of a pile to the surrounding soil by skin friction and toe resistance is still uncertain. The results of the static pile load test are usually presented as settlement curve. This curve can be divided into two components: skin friction curve and toe resistance curve according to the settlement. Laboratory research of pile load test was carried out in two schemes: with skin friction and without skin friction. The study proved that the toe resistance with and without skin friction is not the same. Skin friction influence on toe resistance due to settlement. This phenomenon is not usually taken into account, but very often has a significant impact on axially applied load transfer. In the paper results of laboratory pile load tests id, different schemes were presented.

scholarly journals Evaluation of the Pullout Behavior of Pre-Bored Piles Embedded in Rock

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5593
Author(s):  
Kyungho Park ◽  
Daehyeon Kim ◽  
Gyudeok Kim ◽  
Wooyoul Lee
Keyword(s):  
Numerical Analysis ◽  
Skin Friction ◽  
Adhesion Strength ◽  
Adhesion Force ◽  
Load Test ◽  
Drilled Shaft ◽  
Allowable Limit ◽  
Dry Process ◽  
Bored Pile ◽  
Pull Out

The subject of this study is dry process caisson tube method cofferdam (hereinafter called C.T cofferdam). This C.T cofferdam is designed to use the skin friction of the drilled shaft embedded into the rock for stability of buoyancy. A pre-bored pile embedded in the bedrock was pulled out due to the buoyancy of the C.T cofferdam at the pier (hereinafter called P) 2 of the OO bridges under construction, to which this was applied. In this study, in order to solve this problem, the adhesion force applied with the concept of skin friction and the pre-bored pile of drilled shaft according to domestic and foreign design standards were identified; the on-site pull-out load test was used to calculate the pull-out force; and the skin friction of the drilled shaft and pre-bored pile embedded into the bedrock were compared and analyzed. In addition, the pull-out behavior of the pre-bored pile embedded in the bedrock was analyzed through numerical analysis. The adhesion strength tested in the lab was 881 kN for air curing of concrete and 542 kN for water curing of concrete, and the on-site pull-out test result was 399.7 kN. As a result of the numerical analysis, the material properties of the grout considering the site conditions used revealed that the displacement of the entire structure exceeded the allowable limit and was unstable. This appears to have lowered the adhesion strength due to construction issues such as ground complexity and both seawater and slime treatment, which were not expected at the time of design.

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