scholarly journals Load Settlement Behaviour of Pile-Raft Foundation in Cohesionless Soil

2020 ◽  
Vol 8 (6) ◽  
pp. 5839-5843
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Static Load ◽  
Cohesionless Soil ◽  
Modern Approach ◽  
Raft Foundation ◽  
Model Study ◽  
A New Technique ◽  
Special Circumstances ◽  
Settlement Behaviour

Pile-raft foundation is a modern approach in place of conservative method for multi-storey buildings or in some special circumstances. In pile-raft analysis the load settlement behaviour of pile foundation, raft foundation and combination of pile-raft foundation is determined. The use of combination of pile-raft is basically a new technique for economy of foundation resting on the sand. Model Study is carried out to determine the suitability of the pile raft foundation for sand. In this modal study we have studied load deflection behavior of pile-raft foundation by making a prototype of a footing and applying a static load in each case and settlement of footing is noted in 2 dial gauges fixed at alternate edges of footing. As an observation the settlement behaviour of pile-raft foundation is being found less as compared to other two types of foundations tested. The pile-raft foundation is very important and helpful for everyone because if we have soil of low bearing capacity then stabilization of soil is need to be done using different material but the use of pile-raft in sand can eliminate this kind of expenses occurs during construction.

scholarly journals Experimental Study on Static Load of Large-Diameter Piles in Nonuniform Gravel Soil

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Baoyun Zhao ◽  
Xiaoping Wang ◽  
Mijia Yang ◽  
Dongyan Liu ◽  
DongSheng Liu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Static Load ◽  
Large Diameter ◽  
Skin Resistance ◽  
Geological Structure ◽  
Load Test ◽  
Pile Foundations ◽  
Gradual Change ◽  
Test Pile

With the development of tourism, the number of multistorey buildings in mountain areas is increasing gradually, and the requirements of the form and bearing capacity of foundation in landslide areas are getting more demanding than ever. In-situ testing of rock and soil mass in slope area has important practical significance for improving the stability of building foundation. Taking a project in Baishi Mountain located in southwest of China as an example, firstly, the geological structure and mechanical properties of soil are analyzed. Then, two types of pile foundations, i.e., empty-bottom pile foundations and solid-bottom pile foundations, are designed based on the characteristics of the geological structure for carrying out the static load test on pile foundation. The test results are as follows: (a) the load settlement curve (Q-S) of the empty-bottom test pile shows a steep drop, while the Q-S curve of the solid-bottom test pile shows a gradual change, showing that the end-bearing friction pile’s property and the ultimate bearing capacity of the solid-bottom pile are higher than those of the empty-bottom pile. (b) The maximum lateral friction of the four test piles is 139.158 kPa, 148.015 kPa, 150.828 kPa, and 154.956 kPa, respectively. (c) The shaft skin resistance under ultimate load is coming close to the maximum value, and the maximum values are 9.792 mm, 7.939 mm, 9.881 mm, and 14.97 mm, respectively. Research results can serve as design bases for the pile foundation of multistorey buildings located in landslide areas of Baishi Mountain in the southwest of China and also as references for the engineering application of pile foundation in similar geological fracture areas.

Analysis on Reliability of Load Test on Bearing Capacity of Foundation Piles

2014 ◽  
Vol 638-640 ◽  
pp. 671-674
Author(s):  
Yu Zhou Sima ◽  
Qing Hua Sun
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Reliability Index ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Statistic Method ◽  
Bayesian Statistic

In static load test, most of piles do not destroy, the piles still exist capacity, which reduce the reliability index of pile foundation. This paper employs Bayesian Statistic method to update the measured capacity of piles. Meanwhile, based on updating data, the reliability index is calculated considering the destruction of piles. The case study shows that the reliability index of capacity becomes large when the time of pile destruction increases. Therefore, when judging the safety of pile foundation, it is highly necessary to consider the influence of pile destruction on reliability of piles.

scholarly journals Efficiency Analysis of Foundation System

Neutron ◽  
2022 ◽  
Vol 21 (2) ◽  
pp. 60-73
Author(s):  
Resi Aseanto ◽  
Ali Ramdani Bagaskara ◽  
Syafwandi ◽  
Agung Sumarno
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Efficiency Analysis ◽  
Combined System ◽  
Foundation Design ◽  
Cost Overruns ◽  
Land Prices ◽  
Raft Foundation ◽  
Long Time ◽  
Settlement Analysis

The increasing number of residents in South Tangerang has an impact on increasing the need for lower housing. The development of vertical housing with the market name of flats, apartments and is the most effective anticipatory solution to overcome land prices which result in market limitations, especially for the upper middle class. This 32-storey apartment project uses a combined foundation system between drill pile foundation & raft foundation. With the combination of these two very massive systems, of course, it will have a very expensive cost to implement and take a long time to complete. In order to avoid cost overruns, the foundation design must look at the possibilities. To determine the efficiency of the combined system foundation design between pile bored foundation & raft foundation, the researchers analyzed the value of the bearing capacity and also the settlement that occurred in the existing foundation using the Poulos method, the equivalent Raft method and the Vesic method. From the results of the study, it was found that the contribution of the pile foundation bearing capacity was 24.10%. the placement of the raft foundation is 75.90% and the settlement analysis using the Poulos 8.95cm method, the 12.41cm Equivalent Raft method and the Vesic 12.1cm method, these three results are close to the maximum settlement limit.

Testing and Analysis of Bearing Capacity on Pile Foundation

2014 ◽  
Vol 501-504 ◽  
pp. 234-237
Author(s):  
Yan Peng Zhu ◽  
Ze Xue Bao ◽  
Tian Zhong Ma ◽  
Chun Jing Lai
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
High Speed ◽  
Static Load ◽  
Rapid Development ◽  
Load Test ◽  
Foundation Engineering ◽  
Static Load Test ◽  
Volume Weight ◽  
Pile Testing

The application of pile foundation is promoted by the rapid development of the high speed railway, highway, high-rise buildings and big volume weight of building. However, the static load test and low strain test play a very important role in pile foundation inspection and ensurement of the quality of pile foundation engineering. In this paper, combined with the engineering of the basis of a hospital in lanhou, the author analyzed the results of 7 test piles static load test and a large number of low strain test and summarised pile testing contents and methods. At the same time,the bearing capacity of anchor pile in static load test is discussed.

scholarly journals Experiment on Improving Bearing Capacity of Pile Foundation in Loess Area by Postgrouting

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Zhijun Zhou ◽  
Yuan Xie
Keyword(s):  
Theoretical Analysis ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Static Load ◽  
Fluid Model ◽  
Relative Displacement ◽  
Bingham Fluid ◽  
Loess Area ◽  
Bored Piles ◽  
Lateral Friction

Postgrouting technology is an inevitable trend in the development of bored piles in the loess area. To study the behavior of end resistance, lateral friction, and bearing capacity of postgrouting pile and conventional pile, the mechanism of improving the bearing capacity of postgrouting at the end of pile is analyzed by the static load failure test of pile foundation, combined with the principle of grout-soil interaction and Bingham fluid model. The results show that the grout-soil interaction enhances the strength of pile end soil and promotes the exertion of end resistance; the relative displacement of pile-soil decreases, while the lateral friction increases with the change of the interface property of pile-soil; simultaneously, the climb height of grouting is approximately the theoretical analysis value. In addition, postgrouting can obviously improve the bearing characteristics of the pile so that the settlement of the pile foundation is slowed down and the bearing capacity is increased.

Contrast Analysis about the Result of Static Load Test and High Strain Testing for the Bearing Capacity of Screw Pile Foundation

2014 ◽  
Vol 578-579 ◽  
pp. 663-666
Author(s):  
Qi Hong Wu ◽  
Qing Xu ◽  
Shi Ming Wan
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Static Load ◽  
High Strain ◽  
Dynamic Testing ◽  
Load Test ◽  
Static Load Test ◽  
Screw Pile ◽  
Strain Testing ◽  
Contrast Analysis

Firstly, the technology of screw pile is introduced briefly. It has high body quality, high bearing capacity and wide application prospect. Then, based on engineering examples, the results of static load test and high strain testing for the bearing capacity of SCREW PILE foundation are analyzed contrastively. The bearing capacity value tested by high strain dynamic testing is higher than the static loading test’s with 13%~21%, which should be attached importance in the check and accept and application of the screwed pile. The analysis and sum up of testing results should be considered to the design and application of screwed pile, providing some reference to the quality judge and bearing capacity confirming is another purpose in the paper.

Application Study of Long-Short-Piled Raft Foundation

2012 ◽  
Vol 170-173 ◽  
pp. 242-245
Author(s):  
Xin Yu Xie ◽  
Ming Xin Shou ◽  
Jie Qing Huang ◽  
Kai Fu Liu
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
National Standard ◽  
Application Study ◽  
Existing Building ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Total Settlement ◽  
Reinforcement Design

The long-short-piled raft foundation is an unusual type of building base. This kind of foundation is usually applied for pile foundation reinforcement of existing buildings when shortage of bearing capacity of piles occurs. The bearing capacity of pile foundation is improved and less settlement is expected. Since this method has so many obvious advantages, it is recommended in the reinforcement design of piled raft foundation of an existing building in Tianjin. Longer reinforced concrete bored piles are adopted as the supplementary ones. The bearing capacity of this kind of piled raft foundation was studied. The settlement was also analyzed with the National standard method together with the finite element numerical method. According to the study, the bearing capacity of piled raft foundation is enhanced effectively after adding piles. Also, the results show that the total settlement and differential settlement during the construction is in control respectively.

Comportement de pieux d'essais instrumentés sous charge horizontale

1993 ◽  
Vol 30 (1) ◽  
pp. 1-11
Author(s):  
R. Frank ◽  
H. Zervogiannis ◽  
S. Christoulas ◽  
V. Papadopoulos ◽  
N. Kalteziotis
Keyword(s):  
Pile Foundation ◽  
Bending Moment ◽  
Standard Penetration Test ◽  
American Petroleum Institute ◽  
Full Scale ◽  
Test Method ◽  
Cohesionless Soil ◽  
Penetration Test ◽  
Cohesionless Soils ◽  
Final Design

This paper describes the behaviour of two test piles (one bored and postgrouted and one simply bored, both 31.7 m long and 0.75 m in diameter) subjected to horizontal loads. These full-scale pile tests were carried out for the actual design of the pile foundation of a pier of the Evripos cable-stayed bridge. This bridge will link the Euboea Island to mainland Greece. The two piles have already been subjected to bearing capacity tests under axial loadings. The inclinometer measurements, taken during the present tests, yielded, in particular, the deformed shape of the piles as well as the bending moments. Conclusions could be drawn for the final design of the pile foundation with respect to horizontal loadings. Furthermore, various calculation methods using p–y reaction curves for cohesionless soils have been checked: the Ménard pressuremeter method, the method of the American Petroleum Institute recommendations, and the Standard penetration test method of Christoulas. These pile tests show that simple measurements, taken on construction sites, can yield interesting results on the actual behaviour of horizontally loaded piles. Key words : pile, horizontal loading, full-scale test, horizontal loads, bending moment, subgrade reaction modulus, p–y curve, cohesionless soil, Standard penetration test, pressuremeter test.

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