scholarly journals Experimental Study of the Bearing Capacity of Helix Pile Foundation

2021 ◽  
Vol 921 (1) ◽  
pp. 012064
Author(s):  
P R Sangle ◽  
L Febriani
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Triple Helix ◽  
Double Helix ◽  
Peat Soil ◽  
Pile Foundations ◽  
Hard Soil ◽  
Supporting Structures ◽  
Single Helix

Abstract The use helix pile foundations in supporting structures on peat soil has became a challenge for road infrastructure. The helix pile foundation is an alternative for substituting the pile foundation if hard soil is located too far from the surface. Therefore, in this study we examine the bearing capacity of the helix pile foundation on peat soil, including analyzing the effect of the number of helix plates on the bearing capacity of the peat soil. The type of foundation used is a helix pile foundation with a single blade, double blades and triple blades. From the results of the research the bearing capacity of helix double is 35% greater than the bearing capacity of a single helix, the value of triple helix bearing capacity is 25% greater than the double helix and 70% of the single helix. The more number of helix plates used, the greater the bearing capacity of the piles given.

scholarly journals Pile of high bearing capacity

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Vladimir Dubinin ◽  
Aleksandr Piskunov ◽  
Valery Kruglov
Keyword(s):  
Bearing Capacity ◽  
Construction Industry ◽  
Pile Foundation ◽  
Side Surface ◽  
Longitudinal Axis ◽  
Pile Foundations ◽  
Design And Technology ◽  
Construction Technology ◽  
Economic Costs ◽  
Soil Base

The article discusses issues related to the construction of pile foundations of buildings and structures, including bridges and other transport facilities. The development of the construction industry contributes to the improvement of pile Foundation construction technology and a significant reduction in economic costs. Improving the design and technology of pile foundations is one of the main tasks in the field of transport construction. The effectiveness of pile foundations is due to the more complete use of the bearing capacity of the soil base and the strength of the Foundation elements. One of the disadvantages of the pile foundation is the low bearing capacity of the soil on the side surface of the pile. The proposed solution is based on the device along the longitudinal axis of the pile rigidly fixed, multi-pass continuous inclined edges having the shape of a plate, and faces adjacent to the side surface of the tubular steel barrel.

scholarly journals KOMPARASI KINERJA ALAT PILE DRIVING ANALYZER DAN SOFTWARE CAPWAP DALAM MENGHASILKAN DAYA DUKUNG ULTIMIT PONDASI TIANG

2020 ◽  
Vol 28 (3) ◽  
pp. 378
Author(s):  
Rasdinanta Tarigan
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Soft Soil ◽  
Performance Comparison ◽  
Ultimate Bearing Capacity ◽  
Pile Foundations ◽  
Pile Driving ◽  
Analysis Program ◽  
Wave Analysis ◽  
The Difference

Buildings that stand on soft soil usually use a pile foundation. Testing the ultimate bearing capacity of pile foundations in the field is a Pile Driving Analyzer (PDA) tool. Besides being inexpensive to test, the results can also be known quickly. This tool is supported by a software called CAPWAP (CAse Pile Wave Analysis Program).In this paper, a performance comparison of the Pile Driving Analyzer (PDA) and CAPWAP (CAse Pile Wave Analysis Program) software will be presented in producing the ultimate bearing capacity of pile foundations. The results of both will be analyzed in such a way that the causes of the differences in the performance of the Pile Driving Analyzer (PDA) and the CAPWAP software are known.The results obtained show that the performance of the Pile Driving Analyzer (PDA) tool will not be optimal if the energy transferred to the pile foundation is too small. The energy given by the hammer when struck must be in the range of 1% - 2%, if it is smaller then the performance of the tool in producing the ultimate bearing capacity will not be representative. The difference in the ultimate bearing capacity between the PDA device and the CAPWAP software for energy transferred to the pile foundation (EMX) under the specified energy standard is 10.71% - 33.23%. Meanwhile, energy that meets the specified standards has a value between 0.24% - 1.80%.

scholarly journals Calculation of Bearing Capacity and Deformation of Composite Pile Foundation with Long and Short Piles in Loess Areas

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Tianzhong Ma ◽  
Yanpeng Zhu ◽  
Xiaohui Yang
Keyword(s):  
Theoretical Calculation ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Frictional Resistance ◽  
Operating Conditions ◽  
Neutral Point ◽  
Pile Foundations ◽  
Single Pile ◽  
Deformation Control ◽  
Composite Pile

In order to calculate the bearing capacity and settlement deformation of composite pile foundations with long and short piles in collapsible loess areas, the theoretical approximate solution was used to obtain the location of the neutral point of single piles. Additionally, based on the equation to calculate the bearing capacity of multielement composite foundations, a method considering the negative frictional resistance was proposed for calculating the bearing capacity of composite pile foundations with long and short piles. Based on the shear displacement method and the principle of deformation control, an equation to calculate the displacement and deformation of a composite pile foundation was presented. A model test with different operating conditions, i.e., a single pile, four piles, and eight piles, was designed to verify the proposed calculation methods. The results show that the location of the neutral point has a significant influence on the single-pile negative frictional resistance, and the neutral point ratio of the calculation meets the value range of the practical project. When the load at the top of the pile is relatively small, the experimental curve is consistent with the theoretical calculation curve, whereas when the load is comparatively large, the theoretically calculated displacement increase at the top of the pile is greater than the measured one. Under the premise that the theoretical calculation is in good agreement with the results, the theoretical value is larger than the actual value. And it contributes to strengthening engineering safety.

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.

scholarly journals COMPRESSIVE CAPACITY OF HELICAL PILE FOUNDATION ON PEAT WITH VARIATION OF HELICAL PLATE DIAMETER

ASTONJADRO ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 76
Author(s):  
Sapria Adi ◽  
Ferry Fatnanta ◽  
Syawal Satibi
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Pile Foundation ◽  
Peat Soil ◽  
New Method ◽  
Support Structures ◽  
Rate Of Penetration ◽  
Constant Rate ◽  
Helical Plate

<p>The use of helical foundations to support structures on peat soil is still a new method. Research is needed to develop this foundation. There are 6 types of helical foundation tested on peat soil. To study the effect of helical plate diameter, plate diameters were varied with sizes 25 cm (M), 35 cm (L), and 45 cm (G). Plate positions (1, 2, 3 plates) are designed at 300 mm spacing. The axial compression bearing capacity test is carried out based on the constant rate of penetration procedure. At the beginning of loading, the load increases significantly. At a certain descent, the load begins to decrease slowly. The load-settlement curve shows that the larger the plate diameter, the greater the load it can withstand. The largest bearing capacity is produced by the GGG 30 foundation (3 plates dia.45 cm), which is 10.83 kN. LLL 30 helical foundation (3 plates dia.30 cm) provides a bearing capacity of 7.14 kN. These results clearly explain that the increase in plate diameter is directly proportional to the increase in the axial compression bearing capacity.</p>

scholarly journals Molecular mapping of poly(methyl methacrylate) super-helix stereocomplexes

2015 ◽  
Vol 6 (2) ◽  
pp. 1370-1378 ◽  
Author(s):  
Andrew Joseph Christofferson ◽  
George Yiapanis ◽  
Jing Ming Ren ◽  
Greg Guanghua Qiao ◽  
Kotaro Satoh ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Triple Helix ◽  
Molecular Mapping ◽  
Double Helix ◽  
Poly Methyl Methacrylate ◽  
Single Helix

The structure of the it-/st-poly(methyl methacrylate) (PMMA) triple-helix stereocomplex is composed of a double helix of it-PMMA of 9 units per turn surrounded by a single helix of st-PMMA with an average of 20 units per turn.

scholarly journals STUDI MANFAAT DAYA DUKUNG BELLED PILE DAN MULTI-BELLED PILE

2020 ◽  
Vol 3 (4) ◽  
pp. 1113
Author(s):  
Kevin Septiadi ◽  
Aniek Prihatiningsih
Keyword(s):  
Thin Layer ◽  
Bearing Capacity ◽  
Skin Friction ◽  
Pile Foundation ◽  
Uplift Capacity ◽  
Hard Layer ◽  
Bore Pile ◽  
Hard Soil

Foundation is a part of a structure which has a function for to resist and distribute the structure load on it to the soil. The greater load of structure resisted by the foundation make the greater uplift capacity needed. In the pile foundation the bearing capacity be affected by skin friction of the pile and end-bearing resistance, therefore one of the alternative for increase bearing capacity of the pile foundation is by use belled pile or multi-belled pile. Belled pile and multi-belled pile was a modification from the bore pile. The concept of belled pile is enlarge the size of  the base pile with purpose to increase end-bearing resistance of the pile. In multi-belled pile enlarge size happen more than once, the enlarge size happen in the hard layer soil so this alternative will be suitable to applied in the soil that have a thin layer hard soil in the middle. In this study will be explained about bearing capacity behavior of the bore pile, belled-pile and multi-belled pile. The bearing capacity and volume of concrete of three type of pile will be compared. So the result of this study  will show how efficient the use of multi-belled pile compared by straight bore pile. Fondasi adalah sebuah bagian dari stukrtur yang berfungsi untuk menahan dan menyalurkan beban bangunan yang ada diatasnya ke tanah. Semakin besar beban bangunan yang ditahan fondasi maka semakin besar pula daya dukung yang dibutuhkan fondasi. Pada fondasi tiang daya dukung fondasi dipengaruhi oleh gesekan selimut tiang dan tahanan ujung tiang sehingga salah satu cara untuk meningkatkan daya dukung fondasi adalah dengan menggunakan belled pile atau multi-belled pile. Belled pile dan multi-belled pile merupakan hasil modifikasi dari fondasi tiang bor. Konsep dari belled-pile sendiri adalah memperbesar ukuran penampang ujung tiang sehingga diharapkan tahanan ujung dari tiang akan meningkat. Pada multi-belled pile perbesaran penampang terjadi lebih dari satu kali yaitu pada lapisan tanah keras sehingga sangat cocok untuk diaplikasikan pada lapisan tanah yang memiliki lapisan keras tipis di bagian tengah. Pada penulisan ini akan dibahas mengenai perilaku daya dukung fondasi tiang bor biasa, belled pile dan multi-belled. Daya dukung dan volume beton yang digunakan dari ketiga jenis tiang tersebut akan dibandingkan. Sehingga hasil studi ini akan menunjukan seberapa efisien pengunaan belled-pile dan multi-belled pile dibandingkan dengan fondasi tiang bor biasa.

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