scholarly journals Research on the Design of Miniature Pile Foundation for Transmission Line

2019 ◽  
Vol 136 ◽  
pp. 02022
Author(s):  
Xinmin Yu ◽  
Xianri Wang
Keyword(s):  
Transmission Line ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Small Diameter ◽  
Diameter Ratio ◽  
Pile Diameter ◽  
Working Surface ◽  
Bored Piles ◽  
Pile Length ◽  
Small Working

Micro-pile is a kind of small diameter bored piles, also known as root pile, pile diameter is generally 150-400mm, length-diameter ratio is generally greater than 30,and pile length is usually not more than 30m. Compared with ordinary pile, micro-pile has the advantages of fast construction speed, small working surface, high bearing capacity and small settlement.

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

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.

scholarly journals Ultimate Load Tests on Bearing Behavior of Large-Diameter Bored Piles in Weathered Rock Foundation

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Xiaoyu Bai ◽  
Xueying Liu ◽  
Mingyi Zhang ◽  
Yonghong Wang ◽  
Nan Yan
Keyword(s):  
Bearing Capacity ◽  
Limit State ◽  
Large Diameter ◽  
Diameter Ratio ◽  
Load Test ◽  
Single Pile ◽  
Rock Foundation ◽  
Deformation Characteristics ◽  
Lateral Resistance ◽  
Bored Piles

Based on the vertical compressive static load test and pile mechanics test of three large diameter bored piles (one of the test piles was treated with postgrouting) in granite gneisses foundation, the bearing capacity, deformation characteristics, and influencing factors of the single pile under the limit state are analyzed and compared with the recommended values of survey report and the recommended values of current codes. By comparing the measured and theoretical values of pile axial force, the bearing capacity of cast-in-place pile under normal and limit conditions is analyzed. The experimental results show that the Q-s curve of large-diameter rock-socketed mud wall retaining bored pile with a length-diameter ratio of 25–33 and rock-socketed depth of 5–8 d shows a rapid growth. After grouting treatment, the ultimate compressive bearing capacity of single pile is improved, the maximum settlement is reduced by 6.6%, the rebound rate is reduced by 11.1%, and the settlement effect of controlling pile top is not significant. The bearing capacity and deformation characteristics of the three test piles are less affected by length-diameter ratio and rock-socketed depth. For postgrouting piles, the ratio of frictional resistance of rock-socketed segment and the ratio of pile lateral resistance are less affected by length-diameter ratio and rock-socketed depth, while, for postgrouting piles, the ratio of pile lateral resistance is more affected by rock-socketed depth. The pile end resistance ratio of the three test piles is significantly affected by the rock-socketed depth, whether or not the pile side postgrouting treatment is carried out.

scholarly journals Improving pre-drilling efficiency by analysing geological prospecting data: a case study of a project in Nanshan, Shenzhen

2020 ◽  
Vol 165 ◽  
pp. 03047
Author(s):  
Da Liu ◽  
Zheng Liu ◽  
Tianyu Chen
Keyword(s):  
Pile Foundation ◽  
Design Stage ◽  
Geological Condition ◽  
Optimal Length ◽  
Bored Pile ◽  
Bored Piles ◽  
The Cost ◽  
Rock Strata ◽  
Pile Length

Pre-drilling is a widely used technique to get the detailed geological condition at the location of the bored pile foundation prior to its construction. It is often a necessary step for bored piles supported by strata, as its results are helpful for finalizing the pile length in design stage, which often requires the pile to be embedded into the rock strata at certain depth. The aim of the paper is to find the optimal (normally the lowest) point of rock strata at the purposed pile location, so that the optimal length required for the pile can be determined. To achieve this, geological prospecting data of the site needs to be analysed and the optimal pre-drilling point needs to be determined. The model developed by this study is based on the geological prospecting data and the pre-drilling results of a real project with a sharp slope of strata. It is found that by using the method introduced in this study, higher accuracy results could be obtained with less pre-drilling works required, hence the time and the cost of pre-drilling can be greatly reduced.

Study on the Design Method of Different Thickness-Diameter Ratios for Composite Foundation with Rigid Long and Short Piles

2014 ◽  
Vol 580-583 ◽  
pp. 723-728
Author(s):  
Jian Xing Tong ◽  
Xun Hai Sun ◽  
Peng Fei Luo ◽  
Ning Jia ◽  
Xin Hui Yang ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Traditional Method ◽  
Design Method ◽  
Diameter Ratio ◽  
Composite Foundation ◽  
Pile Diameter ◽  
Different Thickness ◽  
Equal Thickness

Composite foundation can be designed as long and short piles that lie on different bearing strata with high bearing capacities. Researches have shown that for foundation with sufficient stiffness, the ratio of the thickness of cushion to pile diameter (thickness-diameter ratio) plays an important role on the exertion of bearing capacities of pile and soil between piles. Traditional method just applies equal thickness-diameter ratio to design composite foundation with long and short piles, which hinders the exertion of bearing capacity of composite foundation. To overcome this defect, this paper studies the relations between thickness-diameter ratio and the exertions of bearing capacities of pile and soil between piles. The design method of thickness-diameter ratio for composite foundation with long and short piles is also proposed in this study.

Research on the Optimization Design of the Bridge Foundation Bored Piles

2014 ◽  
Vol 1030-1032 ◽  
pp. 851-854
Author(s):  
Yong Chun Cheng ◽  
Ji Zhong Zhao ◽  
Peng Zhang ◽  
Jing Lin Tao ◽  
Ya Feng Gong
Keyword(s):  
Optimization Design ◽  
Design Method ◽  
Design Parameters ◽  
Foundation Design ◽  
Pile Diameter ◽  
Bored Piles ◽  
Vertical Bearing ◽  
Bridge Foundation ◽  
Vertical Bearing Capacity ◽  
Pile Length

This paper improves the method of calculating the vertical bearing capacity of bored piles, and unifies calculation method of singe pile under horizontal force, as well adds and modifies the design parameters of the specification, finally utilizes actual example to make a unified test of the above methods. The results proved that, through the optimization of bridge foundation design method of bored piles, it can significantly reduce construction cost, and makes the pile length, pile diameter, and reinforcement more safe and reasonable. At the same time, it has great directive significance to the design and construction of the bridge.

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.

Elasto-Plastic Design of Piled Raft Foundation

2012 ◽  
Vol 446-449 ◽  
pp. 588-591
Author(s):  
Ai Hong Han ◽  
Hui Jun Zheng
Keyword(s):  
Small Diameter ◽  
Plastic Property ◽  
Plastic Design ◽  
Piled Raft ◽  
Pile Diameter ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Full Capacity ◽  
Pile Length ◽  
Better Than

When the loading sustained by the foundation is large, employing piled raft foundation is one of the best solutions. In the elasto-plastic design of piled raft, piles could improve the differential settlement and reduce raft thickness. As the raft sustains high earth and water pressures, by reducing the span length of raft and excavation depth, one can get economic design. Using elasto-plastic property of the pile is a better method to avoid increasing the pile length and pile diameter and making full capacity of the piled raft foundation in design compared to normal piled raft. With adoption of few small diameter piles, the raft thickness could be reduced significantly. This makes it much better than raft foundation.

Analysis of Relationship between Pile Quality and its’ Bearing Capacity

2010 ◽  
Vol 163-167 ◽  
pp. 3517-3522
Author(s):  
Xiao Gui Wen ◽  
An Sun ◽  
Hui Ming Wu ◽  
Wen Tao Wang
Keyword(s):  
Bearing Capacity ◽  
Storage Tank ◽  
Vertical Load ◽  
Bored Pile ◽  
Load Tests ◽  
Bored Piles ◽  
Post Grouting ◽  
Pile Length ◽  
Main Factor

Bored pile is one of the most widely used foundation forms in civil engineering. Relationship between pile quality and its’ bearing capacity is seldom been discussed. This paper introduces 8 bored piles in one storage tank project in Ningbo, of which 4 piles are done vertical load tests; the other four are done lateral load tests. Combined with their quality, the results reveal that when load is small, pile quality has much influence on pile bearing capacity. As soon as load is large enough to transfer to pile bottom, quality of concrete at pile bottom becomes the main factor that impacts pile vertical capacity, meanwhile pile horizontal bearing capacity mainly depends on pile length. Post-grouting is done to improve pile quality. It raises pile’s bearing capacity while reducing differential settlement at the same time.

scholarly journals BEARING CAPACITY OF DEEP PILE FOUNDATION FOR HIGH-RISE FACILITY ON WEAK SOILS: COMPARING OF ANALYSIS RESULTS AND EXPERIMENTAL DATA

2019 ◽  
Vol 15 (1) ◽  
pp. 90-97
Author(s):  
Rashid Mangushev ◽  
Nadezhda Nikitina
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Standard Test ◽  
Strain Gauges ◽  
Construction Site ◽  
Static Testing ◽  
High Rise ◽  
Weak Soils ◽  
Comparative Results ◽  
Pile Length

The results of static testing of the pile and comparative results of analytical and numerical calculations for the experimental deep pile (length 65 m, diameter 1.2 m) under the high-rise building, designed in the area of a large thickness of weak soils, are presented in the paper. At the same construction site, an experimental barrette pile of rectangular crosssection with a size of 3.3 x 1.1 and a length of 65 m with the location of the base in solid Proterozoic clays was made. This pile was tested with the use of Osterberg cells, for which strain gauges were mounted in its reinforcement cage at 9 levels. In the first stage, a standard test of the entire experimental barrette pile in the top-down direction was conducted; in the second, after reaching the maximum possible load, the tests were carried out using the “O-cells” located at a depth of 50 m in the thickness of solid clays and transmitting the load in two directions (up and down). A General assessment of the bearing capacity of the barrette pile obtained by three methods is given.

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