scholarly journals Behavior of Defective Cast in Place Piles

2021 ◽  
Vol 27 (4) ◽  
pp. 96-117
Author(s):  
A'amal A. Al-Saidi ◽  
Mosa J. Al-Mosawe ◽  
Yousef Al-Shakarchi Al-Shakarchi
Keyword(s):  
Bearing Capacity ◽  
Experimental Work ◽  
Critical Case ◽  
Defect Type ◽  
Floating Pile ◽  
Model Pile ◽  
Two Parameters ◽  
Type Of Failure ◽  
Pile Length ◽  
End Bearing Pile

This paper deals with testing defected model piles in the soil in order to study their behavior. In this respect, the results of model pile tests are discussed either geotechnically or structurally according to the type of failure.   Two parameters were studied in order to evaluate the general behavior of defective piles. These parameters include the defect location and the defect type for floating and end bearing pile. The results of the experimental work indicated that the critical case for floating pile is seen to be when the defect of (5%) at the first third of the pile length at which the decrease in the bearing capacity is about (21%), while the decrease in the bearing capacity is found to be (14%) and (10%), when the defect is at the middle and the lower third of the pile length, respectively. The decrease in the bearing capacity for floating pile is found to be (31%) and (21%) for void and neck defect, respectively, while the decrease in the bearing capacity for end bearing pile is found to be (43%) and (52%) for void and neck defect, respectively.

scholarly journals Analisis Fondasi Raft Pile Bangunan Tinggi Terhadap Struktur Bangunan Di Sekitar

2020 ◽  
Vol 3 (4) ◽  
pp. 1173
Author(s):  
Giovann Giovann ◽  
Gregorius Sandjaja Sentosa
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Soil Conditions ◽  
Train Station ◽  
High Rise ◽  
Floating Pile ◽  
Bored Pile ◽  
Story Building ◽  
Spt Data ◽  
End Bearing Pile

Raft pile is an option for high rise building that has more than 30 stories on soft to moderate soil conditions. Either spun pile or bored pile can be used as the pile foundation. This study focuses on 34-story building that is constructed near electric rail train station, where the soil type is dominantly clay with average N-SPT 20 – 30, there is also thin layer of soil with N-SPT 60. The study compares two types of piles, 30 m depth floating pile and 32 m depth end bearing pile, where the raft thickness is 2 m. The study was conducted by calculating the bearing capacity and settlement with formulas based from correlations of N-SPT and the N-SPT data. Midas 3D also used to simulate the settlement of the building and settlement around the building. The results show that for bored pile with depth of 30 and 32 m respectively has settlement of 20,757 cm and 3,0475 cm while the settlement around the building consecutively is around 10 – 11 cm and 1,5 – 2 cm. Bearing capacity of bored pile with 30 m depth is around 1593,6779 – 5382,5954 kN while bored pile with 32 m depth  is around 1978,9153 – 6021,3859 kN.Fondasi rakit merupakan salah satu pilihan yang dapat digunakan untuk bangunan tinggi lebih dari 30 lantai pada tanah kondisi lunak sampai sedang. Untuk jenis fondasi tiang dapat digunakan tiang bor atau tiang pancang. Dalam penelitian ini dilakukan studi fondasi bangunan 34 lantai yang didirikan dekat dengan stasiun kereta rel listrik di mana lapisan tanah dominan lempung dengan N-SPT rata-rata 20 – 30 dan juga ada nilai N-SPT 60 namun berupa lapisan tipis. Studi dilakukan dengan membandingkan dua jenis tiang yaitu tiang dengan daya dukung friksi kedalaman 30 m dan tiang dengan daya dukung ujung kedalaman 32 m dengan ketebalan fondasi rakit 2 m. Studi dilakukan dengan menghitung daya dukung serta penurunan menggunakan pendekatan rumus-rumus berdasarkan data N-SPT dan korelasi dari data N-SPT, juga dilakukan simulasi Midas 3D untuk mengetahui besar penurunan yang terjadi di sekitar bangunan. Dari hasil studi banding diperoleh penurunan fondasi tiang 30 m dan tiang 32 m berturut-turut sebesar 20,757 cm dan 3,0475 cm sedangkan penurunan sekitarnya diperoleh berturut-turut 10 – 11 cm dan 1,5 – 2 cm. Daya dukung yang diperoleh tiang 30 m berkisar 1593,6779 – 5382,5954 kN dan tiang 32 m berkisar 1978,9153 – 6021,3859 kN.

MECHANISM OF THE BEARING CAPACITY OF THE OPEN-ENDED PILES USING DOUBLE-PIPE MODEL PILE

2019 ◽  
Vol 75 (2) ◽  
pp. I_462-I_467
Author(s):  
Hiroyoshi YAMAZAKI ◽  
Yoshiaki KIKUCHI ◽  
Shohei NODA ◽  
Kazuki SAKIMOTO ◽  
Hiroki MATSUOKA
Keyword(s):  
Bearing Capacity ◽  
Pipe Model ◽  
Model Pile ◽  
Double Pipe

scholarly journals Effect of Pile Spacing on Group Efficiency in Gypseous Soil

2019 ◽  
Vol 5 (2) ◽  
pp. 373 ◽  
Author(s):  
Bilal Jabbar Noman ◽  
Safaa H. Abd-Awn ◽  
Hassan O. Abbas
Keyword(s):  
Bearing Capacity ◽  
Load Condition ◽  
Soil Mass ◽  
Deep Foundation ◽  
Collapsible Soil ◽  
Floating Pile ◽  
Group Efficiency ◽  
Gypsum Content ◽  
Group Pile ◽  
Gypseous Soil

As a matter of fact, the gypseous soil is usually considered as collapsible soil, such type of soil illustrates high resistance to settlement and high bearing capacity when it is dry, but it loses these characteristics when it is inundated and collapses excessively because of the sudden decrease in the volume of the surrounding soil mass. It is founded in the arid and semi-arid regions of the world in Asia, South Asia (Iraq, Syria, Jordan, Yemen, and Iran), North Africa, North America, moreover, it covers more than (31%) of the surface area in Iraq. Gypseous soil is one of the most difficult problems facing the process of building any project because of the difficulty of preventing leakage of water to the soil in practice. Deep foundation (piles) are one of the most common types used in collapsible soils which penetrating problematic soil layers and reaching more hard ones (end bearing piles) or transfers loads depending on skin friction (floating pile). The current work is directed to study the behavior of single and group driven pile of square pattern (4 piles) in case of floating pile (friction pile) with different spacing (2D, 4D, 6D) and length to diameter (L/D) ratio of (20) in this special medium dense soil (gypsum content 30% and 61%) under axial load condition. The investigation was carried out to measure the soil collapse before and after inundation. The results showed that the group efficiency for spacing 2D is less than one while for spacing 4D and 6D are more than that value. In addition, the spacing 4D was more efficient to carry 4 group pile in both dry and soaked cases, in addition, the result showed a high reduction in the bearing capacity at inundation state of group pile of (82% in gypsum content 30%) and ( 87% in gypsum content 61%) with respect to dry state.

scholarly journals REVIEW OF BEARING CAPACITY AND SETTLEMENT OF PILE FOUNDATION IN PORT INFRASTRUCTURE

Pondasi ◽  
2020 ◽  
Vol 23 (2) ◽  
pp. 1
Author(s):  
Adi Sunarno ◽  
Rinda Karlinasari ◽  
Abdul Rochim
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Pile Group ◽  
Standard Penetration Test ◽  
Infrastructure Development ◽  
Lateral Deflection ◽  
Economic Progress ◽  
Port Infrastructure ◽  
Pile Length ◽  
Group Pile

ABSTRACTThe rapid infrastructure development is one of the indicators on the country economic progress. Indonesia as one of the largest archipelagic countries in the world, should be prioritized the port infrastructure to support the maritime. One of the government’s solutions is infrastructure development of Kuala Tanjung port. This research analyzed bearing capacity and settlement of single and group pile foundation on port infrastructure of Kuala Tanjung so it is known that the port is safe to use. The data used are Standard Penetration Test data with soil stratigraphy that is clay and sand. The type of foundation used is Concrete Spun Pile 1000 mm and 600 mm with a pile length of 36 meters. The data are then analyzed by manual calculation and Allpile 6.5E program based on Reese method and methods such as Vesic and Converse-Labarre. The results showed that single pile foundations of 1000 mm and 600 mm each had allowable capacity (Qall) 492.78-538.81 ton and 110.65-128.31 ton, with vertical load (Q) of 330.90 ton, settlement 0.56-1.17 cm and 3.32-3.64 cm, lateral deflection 27.50 cm and 94.90 cm. While the 1000 mm and 600 mm pile group foundations respectively have Qall 8717.31-10796.29 tons and 2059.25-2566.32 tons, with Q of 6618 tons, settlement 0.56-1.68 cm and 3.32-3.64 cm, lateral deflection of 2.49 cm and 19.49 cm. The conclusion of the research indicates that the safe pile foundation used is 1000 mm group pile foundation. Keywords: Bearing Capacity; Foundations; Pile Foundation; Port Infrastructure; Settlement

Field Study of Improvement Mechanism of Geogrid-Reinforced and Pile-Supported Embankment

2014 ◽  
Vol 587-589 ◽  
pp. 928-933 ◽  
Author(s):  
Feng Lian ◽  
Zhi Liu ◽  
Jie Xu ◽  
Qiang Wang ◽  
Xian Hu Hu ◽  
...  
Keyword(s):  
Load Transfer ◽  
Soft Soil ◽  
Composite Foundation ◽  
Replacement Ratio ◽  
Floating Pile ◽  
Pile Cap ◽  
Soil Arch ◽  
Better Than ◽  
End Bearing Pile ◽  
Pile Supported Embankment

Two experimental areas in a highway soft soil ground treatment project in Guangdong Province were designed to investigate the improvement mechanism of geogrid-reinforced and pile-supported embankment(GRPS).The experimental results showed: In End-bearing Pile Area,the differential settlement between pile and soil was bigger than that of Floating Pile Area,so the bearing capacity of soil was exerted to a certain extent in Floating Pile Area. The bearing efficacy of soil below the pile cap was little, so the replacement ratio of composite foundation could be calculated according to the pile cap dimension. The load transfer efficacy of the geogrid was better than that of the soil arch. Five kinds of methods were used to evaluate the soil arch in the fill and it was indicated that the results calculated by the BS8006 method and Carlsson method was close to the experimental data which was smaller than results calculated by Hewlett method and Terzaghi method, bigger than Guido method. Through the analysis of the pile-soil stress ratio, the improvement mechanism of the two types of GRPS were revealed.

Numerical Simulation of Squeezed Branch and Plate Pile Subjected to Vertical and Lateral Loads

2014 ◽  
Vol 926-930 ◽  
pp. 597-600
Author(s):  
Xiao Juan Gao ◽  
Yue Hui Li
Keyword(s):  
Numerical Simulation ◽  
Elastic Modulus ◽  
Bearing Capacity ◽  
Lateral Load ◽  
Vertical Load ◽  
Lateral Loads ◽  
Load Bearing Capacity ◽  
The Mean ◽  
Bearing Behavior ◽  
Pile Length

Based on the theoretical analysis results, the bearing behavior of squeezed and branch pile under vertical load and lateral load was analyzed in this paper. The mean works include the influence of vertical load on the pile lateral bearing capacity and influence of the lateral load on the vertical load bearing capacity. The factors influence the bearing capacity of pile such as elastic modulus of soil around and under pile bottom, pile length, plate position are also analyzed.

scholarly journals Bearing Characteristics of Composite Pile Group Foundations with Long and Short Piles under Lateral Loading in Loess Areas

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Tianzhong Ma ◽  
Yanpeng Zhu ◽  
Xiaohui Yang ◽  
Yongqiang Ling
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Horizontal Displacement ◽  
Pile Group ◽  
Lateral Load ◽  
Test Model ◽  
Pile Head ◽  
Load Bearing ◽  
Composite Pile ◽  
Pile Length

It is very necessary to research the bearing characteristics of composite pile group foundations with long and short piles under lateral load in loess areas, because these foundations are used widely. But few people researched this problem in loess areas up to now worldwide. In this paper, firstly, an indoor test model of a composite pile foundation with long and short piles is designed and then employed to explore the vertical load bearing characteristics and load transfer mechanisms of a single pile, a four-pile group, and a nine-pile group under different lateral loads. Secondly, ANSYS software is employed to analyze the load-bearing characteristics of the test model, and for comparison with the experimental results. The results demonstrate the following. (1) The lateral force versus pile head displacement curves of the pile foundation exhibit an obvious steep drop in section, which is a typical feature of piercing damage. A horizontal displacement limit of the pile foundation is 10 mm and 6mm for the ones sensitive to horizontal displacement. (2) The axial force along a pile and frictional resistance do not coincide, due to significant variations and discontinuities in the collapsibility of loess; a pile body exhibits multiple neutral points. Therefore, composite pile groups including both long and short piles could potentially maximize the bearing capacity and reduce pile settlement. (3) The distribution of stress and strain along the pile length is mainly concentrated from the pile head to a depth of about 1/3 of the pile length. If the lateral load is too large, short piles undergo rotation about their longitudinal axis and long piles undergo flexural deformation. Therefore, the lateral bearing capacity mainly relies on the strength of the soil at the interface with the pile or the horizontal displacement of the pile head.

Geometry Optimization and Engineering Applications of Transmission Tower Foundation in the Slope

2013 ◽  
Vol 423-426 ◽  
pp. 1243-1247
Author(s):  
Bin Peng ◽  
Xing Yun Wang ◽  
Yu Wang ◽  
He Huang
Keyword(s):  
Regression Analysis ◽  
Bearing Capacity ◽  
Geometry Optimization ◽  
Ultimate Bearing Capacity ◽  
Nonlinear Regression Analysis ◽  
Transmission Tower ◽  
Engineering Applications ◽  
Practical Engineering ◽  
Tower Foundation ◽  
Pile Length

Combining with practical engineering, geometry optimization and engineering applications of transmission tower foundation in the slope is researched by using the finite-difference software FLAC3D. The variation of the pullout, vertical and horizontal ultimate bearing capacity with the diameter and length of the pile is analyzed. And optimization program of actual project is given. Research shows that when the pile length is constant, the variation of the pullout and vertical ultimate bearing capacity is increasing with the diameter increasing significantly and the horizontal ultimate bearing capacity is not significant. When the diameter is constant, the pullout, vertical and horizontal ultimate bearing capacity is increasing with the length increasing significantly. By analyzing nonlinear regression analysis of calculation data, the formula of the ultimate bearing capacity is carried out, which can consider the different pile diameters and lengths. When the gradient and distance of slopes is constant, the pullout, vertical and horizontal ultimate bearing capacity can be carried out with the formula, which can provide a reference to specification revision and engineering.

Dynamic and Static Study on Bearing Capacity of Reinforced Mixing Pile Composite Foundation

2012 ◽  
Vol 256-259 ◽  
pp. 612-615
Author(s):  
Gui Lin Sheng ◽  
Ya Ge Zhang
Keyword(s):  
Bearing Capacity ◽  
Seismic Response ◽  
Axial Stress ◽  
Bending Moment ◽  
Composite Foundation ◽  
Single Pile ◽  
Ultimate Capacity ◽  
Ansys Software ◽  
Length And Area ◽  
Pile Length

The axial stress and axial displacement distribution curves of reinforced mixing single pile are researched by ANSYS software; and the differences of the single pile ultimate capacity of reinforced mixing pile between different core pile length and area replacing ratio are analyzed; It compared and analyzed envelope diagrams of bending moment and shear of reinforced mixing pile in different core pile length and area replacing ratio under seismic response. Some conclusions which may be of some value for design and construction of reinforced mixing pile composite foundation are drawn

scholarly journals Damage Analysis and Experimental Study of Composite Structures with Initial Delamination

2019 ◽  
Vol 37 (4) ◽  
pp. 730-736
Author(s):  
Zhikai Wang ◽  
Zhipeng Chen ◽  
Nana Yang ◽  
Tao Yang
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
Composite Laminates ◽  
Composite Structures ◽  
Load Capacity ◽  
Compression Modulus ◽  
Ultimate Bearing Capacity ◽  
Effective Length ◽  
Linear Segment ◽  
Two Parameters

Composite laminates are prone to delamination during hot pressing and cooling, this delamination is one of the most important defects that affect the properties of composite structures, the formation and propagation of delamination in composite materials can significantly reduce the structural strength of composite materials and even lead to catastrophic failure. In this paper, the two parameters of the initial stratified position and the initial stratified diameter are selected to research the effects of these two parameters on the mechanical properties of composite laminates through numerical simulation and experiment, and concludes that the influence of initial delamination along the thickness direction on the average compression modulus and strain of the linear segment is small; the influence of delamination on the ultimate bearing capacity increases with the decrease of the distance between the delamination and the center plane. When the diameter of the delamination is in the range of 8%~20% of the effective area(18~44 mm), the influence on the average compression modulus, ultimate bearing capacity and strain of the linear segment is not obvious. When the diameter is increased to 27% of the effective length(60 mm), the above properties have changed greatly. And then, this paper introduces the bilinear controlled cohesive elements into the progressive failure method to calculate the ultimate load capacity of composite laminates, and demonstrate the accuracy of the simulation method by experiments.

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