scholarly journals Bearing capacity analysis of helical pile foundation on peat

2018 ◽  
Vol 195 ◽  
pp. 03005
Author(s):  
Ferry Fatnanta ◽  
Andarsin Ongko
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Load Test ◽  
Building Construction ◽  
Capacity Analysis ◽  
Cross Sectional ◽  
Tension Tests ◽  
Constant Rate ◽  
Helical Piles ◽  
The Individual

Peat is a kind of soil with a very low bearing capacity and high compressibility. Generally, a building construction on peat is done by using a wooden pile foundation. However, the length of the wooden piles is sometimes limited and causes the friction strength between the soil and wooden piles to became suboptimal. In order to enhance the bearing capacity of the foundation, the cross-sectional area of the foundation needs to be enlarged. One of the solutions for this problem is through helical piles. There are two methods to determine the helical pile`s bearing capacity, i.e. individual bearing and cylindrical shear methods. In this paper, bearing capacity prediction was discussed. A foundation load test was thoroughly done by a constant rate of penetration. This test consisted of compression and tension tests. The result was analyzed by individual bearing and cylindrical shear methods and next compared to each other. The result of the analysis has shown that the individual bearing method was more suitable in predicting helical piles’ bearing capacity since it produced the lowest error rate, with a magnitude of 21,31%.

scholarly journals Bearing Capacity Analysis of Spun Pile Foundation in Gas Engine for Electrical Power Plant Project of Selayar

2020 ◽  
Vol 7 (2) ◽  
pp. 123
Author(s):  
Indra Mutiara
Keyword(s):  
Power Plant ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Electrical Power ◽  
Capacity Analysis ◽  
Water Tank ◽  
Gas Engine ◽  
Service Water ◽  
Allowable Bearing Capacity ◽  
Electrical Power Plant

Gas Engine for Electrical Power Plant Project of Selayar is a power plant which will be built in Selayar Regency. This plant uses gas and biodiesel as a fuel. The facilities needed in the power plant construction includes a Gas Engine, Service Water Tank and Biosolar Tank. This study aims to obtain the allowable bearing capacity of the prestressed spun pile foundation for the three buildings based on soil investigation data of SPT (Standard Penetration Test) at BH-1 (gas engine), BH-2 (service water tank) and BH-3 (biosolar tank). The Meyerhof formula is used for the calculation of ultimate bearing capacity analysis on prestressed spun piles with various diameters for each depth. Calculation of the allowable bearing capacity (Qa) of the foundation at a depth of 19 meters, using a spun pile with a diameter of 300 cm, obtained a Qa value of 94.17 tons at BH-1, 94.20 tons at BH-2, and 74.65 tons at BH-3. Using a spun pile with a diameter of 400 cm, the Qa values were 116.71 tons on BH-1, 117.64 tons on BH-2, and 91.92 tons on BH-3. Using a spun pile with a diameter of 500 cm, the Qa values were 168.67 tons on BH-1, 172.09 tons on BH-2, and 131.49 tons on BH-3. Meanwhile, the values of Qa obtained were 229.85 tons on BH-1, 236.66 tons on BH-2, and 177.79 tons on BH-3 with the use of a spun pile with a diameter of 600 cm.

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.

Meningkatkan Daya Dukung Tiang Pondasi Minipile Persegi Pada Gedung Kantor Ngasem Kabupaten Kediri Menggunakan Metode Mayerhoff

2021 ◽  
Vol 4 (2) ◽  
pp. 41
Author(s):  
Erwin Dwi Laksana ◽  
Edy Gardjito ◽  
Suwarno Suwarno ◽  
Faiz Muhammad Azhari ◽  
Imam Mustofa
Keyword(s):  
Bearing Capacity ◽  
Soil Type ◽  
Building Construction ◽  
Office Building ◽  
Cross Sectional ◽  
Cross Sectional Dimension ◽  
Pile Cap ◽  
Calculation Results ◽  
Foundation Pile ◽  
Hard Soil

The foundation is one part under the building that has a very important role. The choice of the type of foundation is something that needs to be considered. One type of foundation that is widely used is the minipile foundation. Minipile foundation itself is a type of foundation that is used if the load received from the superstructure is not too heavy and the hard soil type is at a depth of between 5-10m. The purpose of this study was to plan the bearing capacity of the minipile foundation pile in the PT. BPJE in Ngasem, Kediri Regency. The building is planned to be used as an office building. The planned sub-building includes foundation planning with a mini-square building with a cross-sectional dimension of 20x20. The calculations carried out include the calculation of the bearing capacity of the foundation using the Mayerhoff method, the calculation of the flexural factor and the calculation of reinforcement. The calculation results (sigma Vertical Ultimate) Vu = 114.78 tons. With bending factor tk = 286.95 kg /. The reinforcement in the pile cap for the x direction of tensile reinforcement = D16–170 and compression reinforcement = D16–250 while for tensile reinforcement in the y direction = D16 - 170 and compressive reinforcement = D10 - 250. Thus, the results of the planning can be used as a reference for the implementation of building construction. office of PT. BPJE in Ngasem, Kediri Regency.

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 UJI TAHANAN TARIK MODEL FONDASI TIANG DALAM TANAH PASIR

2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Andikanoza Pradiptiya ◽  
Yuwono Yuwono
Keyword(s):  
Pile Foundation ◽  
Tensile Load ◽  
Frictional Resistance ◽  
Load Test ◽  
Scale Model ◽  
Resistance Force ◽  
Loading Test ◽  
Constant Rate ◽  
Uplift Resistance ◽  
Pile Model

ABSTRACTCertain buildings limit displacement of pile foundation with relatively small value so as not to cause damage to the structure. Loading test directly in the field requires a very high cost. To overcome this problem, it can be approached with a more economical cost, that is to move it into a certain scale models. The method used is to create a media model as a test box testing, by simulating the actual model in the form of a scale model. This method is fairly cheap and efficient as it can be used for various models and can be used repeatedly. The study was conducted using models of reduced scale single pile foundation made of concrete with a length of 0.2 m, 0.3 m, 0.4 m and each diameter of 0.02 m, 0.03 m, 0.04 m. Pile model is jacked in clay soil that has been compacted in a box and then given a tensile load test referring to ASTM D3689-07 procedure E (Constant Rate of Uplift Test). Mobilization of uplift resistance is determined from the pile frictional resistance force and displacement of the pile. The results showed that the frictional resistance value is reduced to the value at a particular displacement or at critical displacement pile.Key words : uplift resistance , sand, mini pile.ABSTRAKBeberapa konstruksi bangunan memberikan batasan kepada perpindahan tiang yang terjadi dengan nilai yang relatif kecil supaya tidak menyebabkan kerusakan struktur. Metode uji yang dipakai adalah membuat box uji model sebagai media pengujian, dengan mensimulasikan model yang sebenarnya ke dalam bentuk model skala. Penelitian dilakukan menggunakan model fondasi tiang tunggal skala tereduksi yang terbuat dari beton dengan panjang 0,2 m, 0,3 m, 0,4 m dan masing-masing diameter 0,02 m, 0,03 m, 0,04 m. Model tiang dipasang dengan cara ditekan pada tanah pasir yang sudah dipadatkan dalam box uji kemudian diberikan beban tarik yang mengacu pada ASTM D3689-07 prosedur E (Constant Rate of Uplift Test). Tahanan tarik tiang ditentukan tahanan gesek satuan dan perpindahan tiang berdasarkan variasi pengaruh diameter dan panjang tiang. Hasil penelitian menunjukkan bahwa nilai tahanan gesek satuan ultimit (fs) dan perpindahan kritis (δc) relatif menurun dengan bertambahnya ukuran diameter (d) tiang tetapi sebaliknya nilai fs tiang meningkat dengan dengan bertambahnya ukuran panjang (L) tiang. Semakin besar panjang tiang memperlihatkan kecenderungan bahwa pengaruh tekanan tanah lateral pasir terhadap selimut tiang meningkat sehingga memberikan kontribusi tahanan gesek yang lebih besar, sedangkan penambahan diameter tiang tidak meningkatkan tekanan tanah lateral pasir terhadap tiang.Katakunci : Tahanan tarik, pasir, Model Fondasi tiang.

scholarly journals Axial Bearing Capacity Analysis of Pile Foundation using Nakazawa Method

Jurnal IPTEK ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 45-52
Author(s):  
Laras Laila Lestari ◽  
Jaka Propika ◽  
Aisyah Dwi Puspasari
Keyword(s):  
Bearing Capacity ◽  
Soil Type ◽  
Pile Foundation ◽  
Capacity Analysis ◽  
Calculation Methods ◽  
Soft Soils ◽  
N Value ◽  
Axial Forces ◽  
Friction Bearing ◽  
Friction Interaction

Pile foundation serves to distribute all the loads in the building to the ground. There are several calculation methods for bearing capacity of pile foundation, one of them is Nakazawa method. Nakazawa method adapted from calculation used in Japan where it is relevant for soft soils. The aim of this research is to obtain axial bearing capacity of pile foundation that can withstand axial forces using Nakazawa method. The parameter that used for the calculation is modified or average N-value (). The analysis result shows the  value is smaller than N existing, indicate that Nakazawa tend to use weaker value of N blows. It means the calculation is considered softer type of soils than the existing ones.The value of point bearing capacity, Rp, assimilate to the pattern of N-SPT. The result value of friction bearing, Rf, in respect of depth shows the linear trending. Rf along the pile depends on the friction interaction between soil and structure. This phenomena influenced by the soil type. The value of cohession along the pile augment, means the ability of soils to stick to the pile/structure is also high. It explains why the value of friction bearing is bigger in respect of depth.

scholarly journals Analysis of Bearing Capacity of Helical Pile with Hexagon Joints

2018 ◽  
Author(s):  
Daehyeon Kim ◽  
Kyemoon Baek ◽  
Kyungho Park
Keyword(s):  
Bearing Capacity ◽  
Field Test ◽  
Static Load ◽  
Load Test ◽  
Basic Data ◽  
Static Load Test ◽  
Pile Installation ◽  
Helical Piles ◽  
Pile Load Test

This study aims to improve the shaft with hexagon joints to be a type not requiring welding or bolts in the static load test . In order to evaluate the bearing capacity of helical piles, two sites were selected to conduct pile installation for the field test and the pile load test. For the pile load test, the static pile load test and the dynamic pile load test were carried out, and torque was measured during pile installation for the field test to compare and analyze expected bearing capacity and thus assess the feasibility of the method for estimating the bearing capacity. The field pile load test revealed the bearing capacity of the gravity grout pile was the same or greater than 600kN in the static pile load test in accordance with AC 358 Code. The non-grout pile showed the bearing capacity the same or smaller than 600kN, suggesting gravity grouting is required. Moreover, the field pile load test was used to establish the bearing capacity equation considering the torque in pile installation, and a small number of samples were used to establish the equation which can be used as a basic data.

scholarly journals Unconventional Bearing Capacity Analysis and Optimization of Multicell Box Girders

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Jovan Tepic ◽  
Rade Doroslovacki ◽  
Mirko Djelosevic
Keyword(s):  
Bearing Capacity ◽  
Specific Capacity ◽  
Strain Analysis ◽  
Local Stress ◽  
Constant Load ◽  
Maximum Deviation ◽  
Capacity Analysis ◽  
Box Girders ◽  
Cross Sectional ◽  
Box Girder

This study deals with unconventional bearing capacity analysis and the procedure of optimizing a two-cell box girder. The generalized model which enables the local stress-strain analysis of multicell girders was developed based on the principle of cross-sectional decomposition. The applied methodology is verified using the experimental data (Djelosevic et al., 2012) for traditionally formed box girders. The qualitative and quantitative evaluation of results obtained for the two-cell box girder is realized based on comparative analysis using the finite element method (FEM) and the ANSYS v12 software. The deflection function obtained by analytical and numerical methods was found consistent provided that the maximum deviation does not exceed 4%. Multicell box girders are rationally designed support structures characterized by much lower susceptibility of their cross-sectional elements to buckling and higher specific capacity than traditionally formed box girders. The developed local stress model is applied for optimizing the cross section of a two-cell box carrier. The author points to the advantages of implementing the model of local stresses in the optimization process and concludes that the technological reserve of bearing capacity amounts to 20% at the same girder weight and constant load conditions.

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.

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