Model Test Research on Horizontal Bearing Characteristics of Close-Ended Valibale Section Pipe Pile

2014 ◽  
Vol 638-640 ◽  
pp. 475-479
Author(s):  
Qing Guang Yang ◽  
Yi Han Chen ◽  
Jie Tian ◽  
Jie Liu
Keyword(s):  
Bearing Capacity ◽  
Load Transfer ◽  
Small Diameter ◽  
Bending Moment ◽  
Horizontal Load ◽  
Foundation Pit ◽  
Pipe Pile ◽  
Diameter Pipe ◽  
Load Displacement ◽  
Constant Section

Base on indoor model tests of three variable section pipe piles and two constant section pipe piles performed in foundation pit,the load transfer mechanism of two kinds of close-ended pipe piles are studied by comparing horizontal load-displacement curves, critical load and bending moment of piles. Results show that horizontal load-displacement curves change slowly and horizontal bearing capacity of valiable section pipe piles will be higher than constant section pipe piles with equal average diameters.Comparing with constant section pipe piles 1# and 2# with equal average diameters, unit volume horizontal critical bearing capacity of 3# and 4# are improved 8.7% and 34.2% respectively and which have different degrees of increse with improvement of valiable section ratio. Moreover,there are two maximum bending moment to valialble section pipe piles insteard of one to constant section pipe piles.To pipe piles 3#,4# and 5#, maximum bending moment ratio of big diameter pipe to small diameter pipe of valiable section pipe pile are 3.13、2.33 and 1.89 respectively. To pipe piles 3# and 4#, maximum bending moments of big diameter pipe are improved 26.8% and 28.4%.Howeverm,maximum bending moment of small diameter pipe are improved 54.1% and 111.8%.So,it is very clear that valiable section pipe pile is more reasonable than constant section pipe pile in bearing characteristics.

Model Test Research on Mechanism of Close-Ended Variable Section Pipe Pile

2014 ◽  
Vol 638-640 ◽  
pp. 480-484
Author(s):  
Qing Guang Yang ◽  
Ya Hui Wang ◽  
Feng Liu ◽  
Jie Liu
Keyword(s):  
Bearing Capacity ◽  
Load Distribution ◽  
Load Transfer ◽  
Skin Resistance ◽  
Small Diameter ◽  
Average Diameter ◽  
Foundation Pit ◽  
Pipe Pile ◽  
Variable Section ◽  
Constant Section

Base on indoor model experiments of two constant section pipe piles and three variable section pipe piles performed in foundation pit,the load transfer mechanism of two kinds of close-ended pipe piles are studied by comparing load-settlement curves,shaft load distribution behaviors,skin resistance and resistance on pile end.Results show bearing capacity of variable section pipe piles is bigger than constant section pipe piles when settlements on pile top are equal.The bearing vertical capacity, unit volume bearing vertical capacity and availability of material of pipe pile will increase with improvement of average diameter and variable section ratio of variable section pipe piles.To variable section pipe pile, shaft load distribution suffered a sudden drop on position of variable section and shaft load distribution of small diameter pipe piles decrease quickly than constant section pipe piles.Resistance on pile end of variable section pipe piles are bigger than constant section pipe piles and resistance, ratio of resistance on pile end to bearing capacity of variable section pipe piles will increase with improvement of average diameter of variable section pipe pile. Action point of max skin resistance of variable section pipe piles are closer to pile top than constant section pipe piles .Max skin resistance will increase with decline with ratio of variable section pipe pile.If settlements on pile top are equal,force of skin resistance of variable section pipe piles are bigger than constant section pipe piles when the average diameters are same.

scholarly journals Study on Bearing Capacity of Prestressed Pipe Pile Foundation Under Horizontal Load

2017 ◽  
Vol 11 (1) ◽  
pp. 301-312 ◽  
Author(s):  
Jin Xu ◽  
Lin Ma
Keyword(s):  
Bearing Capacity ◽  
Bending Moment ◽  
High Strength ◽  
Horizontal Load ◽  
Horizontal Force ◽  
Pipe Pile ◽  
Steel Bar ◽  
Steel Bars ◽  
Pile Cap ◽  
Group Piles

Background and Objective: Prestressed high strength concrete pipe pile (PHC) shows brittle fracture when subjected to more than its own bearing capacity. Therefore, the non-prestressed steel bar is added to the PHC pipe pile, that is, the mixed reinforced pipe pile (PRC). The mechanical behavior of PRC group piles and PHC group piles under horizontal force is studied, and the bending moment diagram and displacement diagram of the pile body are compared so as to find the weak parts. Material and Method: In this paper, Φ600 pipe piles are chosen, and the PRC pipe piles are made of non prestressed steel bars of the same number as the prestressing steel bars, and the two steel bars are spaced apart. Referring to a specific project of Binhai New Area, the geological parameters are used, and the force analysis of group piles under horizontal force is carried out by using the ANSYS software. Results: ANSYS simulation results show that, under the horizontal loading, when the number of piles in group piles is different, the locations of maximum bending moments are different. Increasing the number of the PRC pipe pile with non prestressed reinforcement can effectively reduce the maximum bending moment of the pile body. Conclusion: Under horizontal load, with the increase of pile number and the pile cap aggrandizement, the position of maximum moment of pile body is shifted from 5-8 times diameter of pile to the top of pile. When the pile number reaches a certain amount, the maximum bending moment will appear at the joint between the pile cap and the pile body. At the same time, increasing the non prestressed steel bar does not influence the bending moment, and the reinforcement of the pile cap and the pile top should be strengthened.

Model Test Study on the Effect of Horizontal Load on the Vertical Bearing Capacity of Disk Pile

2011 ◽  
Vol 368-373 ◽  
pp. 2571-2574
Author(s):  
Cheng Yuan Lu ◽  
Jin Jin Li ◽  
Fan Li Meng
Keyword(s):  
Bearing Capacity ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Initial Time ◽  
Horizontal Load ◽  
Vertical Load ◽  
Soil Pressure ◽  
Test Study ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

A group of model tests were designed to study the effect of horizontal load on the vertical bearing capacity of disk pile. Three double-disk piles were used in the test, and the distance of the two disks is 5 times as the disk diameter. Drew a horizontal load H=100N/200N/300N on the top of pile1/2/3 respectively, and put on the vertical load stage by stage, then studied the differences of three piles’ bearing properties such as changes of the pile bending moment, the horizontal and vertical deformation on the top, and soil pressure around the pile. Experiment showed that when the horizontal load is quite small, the existence of horizontal load has little to do with vertical bearing capacity. When the load reached a certain level, the p-∆ effect under the vertical load will significantly affect the vertical bearing capacity of the pile. Especially during the initial time while there is a large horizontal displacement or rotation generated by the horizontal load, the pile’s bearing capacity is controlled by the horizontal displacement.

Theoretical Study on Influence of Disk Spacing on Soil Failure State of Expansion Piles under Horizontal Force

2020 ◽  
Vol 980 ◽  
pp. 301-310
Author(s):  
Yong Mei Qian ◽  
Ting Ting Zhou ◽  
Wei Tian ◽  
Phaaroe Pherekhong Alphonci
Keyword(s):  
Bearing Capacity ◽  
Design Theory ◽  
High Efficiency ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Horizontal Load ◽  
Construction Technology ◽  
Finite Element Software ◽  
Spacing Parameter ◽  
Disk Spacing

Concrete expansion pile represents a new type of high-efficiency and energy-saving variable-section filling pile and it is formed by special construction technology and equipment, this technology has been basically mature which has been gradually applied to engineering in recent years. It has high bearing capacity, small settlement and uniformity, good economic and social effect, strong anti-overturning ability and flexible design[1]. In this paper, with expansion disk spacing under bearing force as the main parameter variable, numerical simulation is carried out by ANSYS finite element software to analyze the variation relationship between horizontal displacement of the pile top, bending moment of the pile and soil stress around the pile of different disk spacing models under horizontal load, and determine the influence of disk spacing parameter on horizontal bearing capacity of the concrete expansion pile. Through the research of this paper, the influence of failure mode of concrete expansion pile and size of the disk spacing on the horizontal bearing capacity under the horizontal load is qualitatively determined, which provides a theoretical basis for improving design theory and practical application of concrete expansion pile.

Analysis of an O-Cell Pile Test in Jinan with FEM

2012 ◽  
Vol 170-173 ◽  
pp. 33-36
Author(s):  
Ying Jie Zheng ◽  
Xue Dai ◽  
Lian Xiang Li
Keyword(s):  
Bearing Capacity ◽  
Load Transfer ◽  
Ultimate Bearing Capacity ◽  
Soil System ◽  
Pile Test ◽  
Load Displacement ◽  
S Curve ◽  
Transfer Method ◽  
Load Transfer Method

In order to promote the experience of applying O-cell pile test to determine the behaviors of integral pile in Jinan, a case of O-cell pile test in Jinan was analyzed with proposed approach. The pile-soil system was simulated with FEM. The resistance parameters of piles, the load-displacement curves and the ultimate bearing capacity of integral pile were determined. Comparing with results obtained from load transfer method, it is found that the p-s curve of integral pile obtained from load transfer method is conservative.

scholarly journals Analysis of the influence of pile embedded cap depth on horizontal bearing capacity of PHC pipe pile group with cap

2020 ◽  
Vol 198 ◽  
pp. 02010
Author(s):  
Xue Bai ◽  
Guohong Zeng ◽  
Zhaosheng Guo
Keyword(s):  
Power Generation ◽  
Field Experiment ◽  
Bearing Capacity ◽  
Bending Moment ◽  
Pile Group ◽  
Analysis Model ◽  
Pipe Pile ◽  
Pile Cap

This paper is based on the background of the field experiment of the closed renovation project of the coal yard of Shanxi Zhangshan Power Generation Co., Ltd., and the horizontal bearing capacity experiment of the three-pile cap foundation of the in-line PHC pipe piles to be carried out on the site is used as the prototype. ABAQUS establishes an analysis model to analyze the influence of pile embedded cap depth on the horizontal bearing capacity of pile cap foundation. The results show that the maximum bending moment the pile can withstand increases as the depth of the pile embedded cap increases. Therefore, increasing the depth of the embedded cap can increase the horizontal bearing capacity of the three-pill.

scholarly journals Experiment Investigation on Stress Characteristics of Grouting Microsteel Pipe Piles with Cement-Soil Wall

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Shujuan Yang ◽  
Mingyi Zhang ◽  
Xiaoyu Bai ◽  
Xueying Liu ◽  
Chen Zheng
Keyword(s):  
Bearing Capacity ◽  
Stress Measurement ◽  
Flexural Rigidity ◽  
Bending Moment ◽  
Steel Tube ◽  
Rock Foundation ◽  
Foundation Pit ◽  
Anchor System ◽  
In Situ Stress Measurement ◽  
Cement Soil

Microsteel pipe piles are widely used in excavation support owing to their excellent bearing capacity, flexural rigidity, construction speed, and adaptability. In this study based on a project in soil-rock layers in Qingdao, China, a new type of support combining microsteel pipe piles mounted in cement-soil piles and anchors was adopted and studied. The inner force change laws and bearing capacity of microsteel pipe piles were discussed through in situ stress measurement and laboratory antibending tests on three microsteel pipe piles. It was found that the bending moment of the piles gradually increased with the foundation excavation and maximized at the pile head. The bending moment was larger at the upper and smaller at the lower part along the depth direction, indicating it is reasonable to design and calculate microsteel pipe piles by the pile-anchor system. The variation law of the foundation pit displacement with the excavation depth was monitored. The horizontal displacement of the foundation pit is the maximum at the base top, which is 6.5 mm. The flexural strength of the miniature steel tube pile after grouting is 40% higher than that of the miniature steel tube pile without grouting. It was indicated that the grouting microsteel pipe piles could be implanted in cement-soil piles, which improved the flexural rigidity of cement-soil piles and limited the deformation of foundation pits. This study provides reference for the design and construction of soil-rock foundation pit supporting projects. At the same time, it provides reference for the application of miniature steel pipe piles in other fields.

Model Test Study on the Effect of Vertical Lode on Horizontal Bearing Capacity of Disk Pile

2012 ◽  
Vol 446-449 ◽  
pp. 1804-1807
Author(s):  
Fan Li Meng ◽  
Guang Yu Sun ◽  
Cheng Yuan Lu
Keyword(s):  
Bearing Capacity ◽  
Model Test ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Combined Loading ◽  
Horizontal Load ◽  
Vertical Deformation ◽  
Vertical Load ◽  
Disk Diameter ◽  
Test Study

In order to study how it influence the horizontal bearing capacity of the disk pile when there exists a vertical load, a group of model tests has been designed. Three double-disk piles were used in the test, and the distance of the two disks is 5 times as the disk diameter. First drew a vertical load V=200N/300N/400N on the top of pile1/2/3 respectively, then put on the horizontal load stage by stage. And by the test, we can study the differences of the pile bearing properties such as changes in the pile bending moment, the horizontal and vertical deformation on the top. Experiment showed that when the vertical load is quite small（V=200N、300N）, the existence of vertical load has little to do with horizontal bearing capacity. When a vertical load increases to a certain value（V=400N）, The maximum bending moment and horizontal displacement of the pile under the same horizontal load reduce, which indicates that the disks of the pile play a significant role in bearing combined loading.

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