Model Test Research of Pile Body Modulus on the Long-Short-Pile Composite Foundation

2011 ◽  
Vol 243-249 ◽  
pp. 2300-2303
Author(s):  
Xin Sheng Ge ◽  
Xiao Li Zhai ◽  
Jiang Wei Xue
Keyword(s):  
Axial Force ◽  
Laboratory Tests ◽  
Stress Ratio ◽  
Load Sharing ◽  
Composite Foundation ◽  
The Other ◽  
Soil Stress ◽  
Soil Load ◽  
The Impact ◽  
Settlement Distribution

In order to study the impact of pile modulus variation on the long-short-pile composite foundation,the relation between bearing capacity and settlement, distribution of the axial force and skin friction along pile, pile-soil stress ratio, load sharing ratio and the bearing mechanics of long-short-pile composite foundation with long and short piles were studied based on laboratory tests in three different conditions: Long pile(Aluminum) with short pile (pentatricopeptide repeats, PPR), Long pile(polyvinyl chloride, PVC) with short pile (PPR), and Long pile(Aluminum) with short pile (PVC). Conclusions were as follows: The settlement of long-short-pile composite foundation decreased with the increasing of long piles modulus, meanwhile, the value of long piles axial force increased, and the value of short piles axial force decreased, and the pile-soil load sharing ratio(LSR) increased. On the other hand, there are few influence on settlement, long piles axial force, and pile-soil load sharing ratio when the modulus of short piles modulus changed, except that the value of short piles axial force and short piles modulus increased or decreased on the same direction.

Model Test Research of Cushion Thickness on the Long-Short Piles Composite Foundation

2010 ◽  
Vol 168-170 ◽  
pp. 2352-2358 ◽  
Author(s):  
Xin Sheng Ge ◽  
Jiang Wei Xue ◽  
Xiao Li Zhai
Keyword(s):  
Skin Friction ◽  
Axial Force ◽  
Stress Ratio ◽  
Load Sharing ◽  
Composite Foundation ◽  
Positive Skin ◽  
Negative Skin Friction ◽  
Soil Stress ◽  
The Impact ◽  
Settlement Distribution

In order to study the impact of cushion thickness on the long-short piles composite foundation,the relation between bearing capacity and settlement,distribution of the axial force and skin friction along pile,pile-soil stress ratio, load sharing ratio and the bearing mechanics of long-short-pile composite foundation with long and short piles were studied based on laboratory tests in three different conditions:zero-centimeter-thick cushion, two-centimeter-thick cushion and five-centimeter-thick cushion in this paper. Conclusions were as follows: The settlement of long-short piles composite foundation increased with the increasing of cushion thickness,Without cushion,the maximum axial force occurred in the pile top.After having paved cushion,it occurred in the neutral dot.The axial force of long and short piles decreased with the increasing of cushion thickness; Without cushion, only positive skin friction occurred. After having paved cushion,negative skin friction came into being existence.The value of long piles skin friction increased with the increasing of the cushion thickness,the value of short piles skin friction decreased with the increasing of the cushion thickness;The pile-soil stress ratio of long pile decreased with the increasing of the cushion thickness while the pile-soil stress ratio of short pile change little,The load sharing ratio of long piles were larger than that of short piles and soil.With the increasing of cushion thickness,the load sharing ratio of long and short piles became smaller while that of soil became larger.

Study on the interference of pier on the channel bed

2021 ◽  
pp. 278-284
Author(s):  
Atul Kumar Rahul ◽  
Akash Priyadarshee ◽  
Prabhat Kumar Singh ◽  
Shyam Bihari Dwivedi
Keyword(s):  
Laboratory Tests ◽  
The Other ◽  
Straight Channel ◽  
Sand Mining ◽  
Continuous Processes ◽  
River Bed ◽  
Natural Flow ◽  
Scouring Process ◽  
Study Laboratory ◽  
The Impact

Scoring and sedimentation are two continuous processes which take place in river bed. These two phenomena have significant impact over the overall behavior of river. Scoring and sedimentation process get affected due the construction of structures like Bridges. Piers of bridge alter the natural flow of rivers. Due to this scouring process increases near to the pier. The scouring process gets affected due to the other activities like sand mining or filling. Also any obstruction like some construction can also affect the scouring. In this study laboratory tests were conducted to understand the nature of scouring near to the pier. For this purpose, model test were conducted in a straight channel with a model concrete pier. The impact of the obstruction in flow, mining of sand and filling of the sand is investigated through this investigation. The finding of this study can be utilized in understanding and development of techniques of controlling scouring near the pier

Study and Analysis on Pile-Soil Stress Ratio of the Composite Foundation of Cement-Soil Mixing Pile under Flexible Foundation

2011 ◽  
Vol 335-336 ◽  
pp. 1145-1150
Author(s):  
Xiao Rong Yang ◽  
Lei Yu Zhang ◽  
Hai Chao Li ◽  
Li Ying Dong
Keyword(s):  
Stress Ratio ◽  
Soft Soil ◽  
Composite Foundation ◽  
Soil Mixing ◽  
Soil Stress ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Flexible Foundation ◽  
Cement Soil ◽  
Friction Pile

In order to analyze the characteristics of pile-soil stress ratio of the composite foundation of cement-soil mixing pile under flexible foundation, this paper points out the displacement mode of friction pile; According to the deformation characteristic of friction pile, ascertain the neutral point of composite foundation. And this paper also derives the exact formula about length-stress ratio which addresses the problem of soft soil foundation according to the deformation co-ordination conditions of the pile composite foundation. The calculation of actual example proves that the formula about pile-soil stress ratio is in accordance with actual measurement number. The pile-soil stress ratio which addresses the problem of soft soil foundation is generally between 2~4. If other conditions keep invariable, pile-soil stress ratio become big when cushion modulus become big. Cushion modulus effect the length-stress ratio greatly.

Finite Element Analysis of Cushion Thickness and Ultimate Bearing Capacity of Lime Soil Pile Composite Foundation

2012 ◽  
Vol 594-597 ◽  
pp. 565-569
Author(s):  
Zi Sen Wei ◽  
Yong Mou Zhang ◽  
Dong Hui Peng
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Stress Ratio ◽  
Shear Failure ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Composite Foundation ◽  
Static Load Test ◽  
Rate Of Increase ◽  
Soil Stress

The static load test of composite foundation was simulated by using the nonlinear finite element programs, and the changes of the pile-soil stress ratio and the pile and soil settlements as well as the plastic deformation of composite foundation were analyzed. The simulation results show that: the cushion of flexible pile composite foundation can effectively regulate the pile-soil stress ratio and make the bearing capacity of the lime soil pile and the soil between piles give full play at the same time. The cushion has a distinct role in reducing the pile settlements, however, has little effect in reducing the soil settlements. The reasonable cushion thickness is about 300mm. The composite foundation will emerge local shear failure when it reaches the ultimate bearing capacity. Reducing the pile spacing can increase the ultimate bearing capacity, and the rate of increase shows a gradually increasing trend.

Analysis on Pile-Soil Stress Ratio of Composite Foundation with Sparse Capped-Piles under Lime-Soil Embankment Load

2014 ◽  
Vol 501-504 ◽  
pp. 124-131 ◽  
Author(s):  
Wei Zheng Liu ◽  
Jun Hui Zhang ◽  
Hao Zhang
Keyword(s):  
Stress Ratio ◽  
Load Transfer ◽  
Stress Transfer ◽  
Composite Foundation ◽  
Transfer Model ◽  
Soil Pressure ◽  
Soil Stress ◽  
Rigid Pile Composite Foundation ◽  
Embankment Height ◽  
Piled Embankment

The combined effect of the embankment fill, piles and caps, and foundation soils on the load transfer characteristics of sparse capped-piled embankment is very significant. Using the modified cylindrical shear stress transfer model based on Marston soil pressure theory, a new calculation method for pile-soil stress ratio of sparse rigid pile composite foundation incorporating the arching effect in lime-soil and soil-pile interaction was presented. The presented method is verified by comparison between analytical solutions and the observed results from a practical project. In addition, a parametric study was also conducted to evaluate the influence of the embankment height, the cohesion of fill and pile-soil stiffness ratio on the pile-soil stress ratio.

Research on Pile-Soil Stress Ratio of DJM Pile Composite Foundation

2011 ◽  
Vol 52-54 ◽  
pp. 533-540
Author(s):  
Qing Zhi Yan ◽  
Yan Hua Wang
Keyword(s):  
Stress Ratio ◽  
Static Load ◽  
Yellow River ◽  
Yellow River Delta ◽  
Composite Foundation ◽  
Important Indicator ◽  
The Yellow River Delta ◽  
Soil Stress ◽  
Load Tests ◽  
Field Static

Pile-soil stress ratio is defined as the average stress ratio of the head of pile to the soil around of piles, which is a very important indicator to reflect the level of the together-work of pile and the soil, also a major parameter of calculation of capacity of composite foundation and settlement. How to choose pile-soil stress ratio is still a problem unsolved. Bearing performance of the DJM pile composite foundation is studied by way of field static load tests and pile-soil stress ratio tests. This paper is to analyze the bearing performance of the DJM pile composite foundation in the Yellow River Delta region with the plane strain finite element method and gain the load-sharing ability of soil and regulations of pile-soil stress ratio with the changes of effecting factors.

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