Causes of pile foundation failure in permafrost regions: The case study of a dry bridge of the Qinghai-Tibet Railway

2017 ◽  
Vol 230 ◽  
pp. 95-103 ◽  
Author(s):  
Yanhui You ◽  
Jinchang Wang ◽  
Qingbai Wu ◽  
Qihao Yu ◽  
Xicai Pan ◽  
...  
Keyword(s):  
Pile Foundation ◽  
Foundation Failure ◽  
Permafrost Regions

scholarly journals Use of the order statistics when predicting pile foundation failure probability

DYNA ◽  
2017 ◽  
Vol 84 (200) ◽  
pp. 247-252
Author(s):  
Jefferson Lins da Silva Jeff ◽  
Nelson Aoki Nelson ◽  
Yara Barbosa Franco Yara
Keyword(s):  
Order Statistics ◽  
Failure Probability ◽  
Pile Foundation ◽  
Foundation Failure

El estudio de la seguridad y confiabilidad de una fundación con pilotes se basa en el análisis de los momentos probabilísticos, media y coeficiente de variación asociados a la superficie resistente, donde se impone la existencia de una población finita representada por elementos aislados de la fundación. Este trabajo presenta un análisis de la adaptación de la estadística para estimar los parámetros poblacionales, usando los conceptos de la estadística de orden. Los valores de resistencia y solicitación de las fundaciones analizadas se basaron en los datos experimentales publicados en la literatura técnica, donde la variable resistencia fue medida por medio de pruebas de carga. El número de ensayos de campo indica especialmente que, para la diversidad de las fundaciones analizadas, la estadística de orden puede ser una herramienta bastante útil para estimar la probabilidad de falla de fundaciones con pilotes, cuando el número de pruebas de carga es pequeño.

Numerical Simulation of Pile Foundations of Qinghai-Tibet Power Transmission Line: Influence of Temperature Region

2014 ◽  
Vol 501-504 ◽  
pp. 218-223 ◽  
Author(s):  
Lin Chen ◽  
Wen Bing Yu ◽  
Wei Bo Liu ◽  
Xin Yi
Keyword(s):  
Climate Warming ◽  
Pile Foundation ◽  
Power Transmission ◽  
Global Climate ◽  
Element Model ◽  
Pile Foundations ◽  
Thermal Fields ◽  
Global Climate Warming ◽  
Thaw Depth ◽  
Permafrost Regions

To analyze the thermal effect of the pile foundation of permafrost, a two-dimensional transient finite element model of the thermal fields with phase change were established. The developments of heat influence limit and maximum thawed depth with and without climate warming were predicted and analyzed. Results indicate that (1) the heat influence limit and maximum thaw depth in permafrost regions enlarge with time elapse, while the global climate warming will have a greater influence to full-space pile foundation compared with the cone-cylinder pile foundation; (2) Considering the global climate warming, heat influence limit (Lmax) and maximum thaw depth (Hmax) in 50th year for full-space pile foundation, cone-cylinder pile foundation are 10.1m, 5.2m, 4.1m, 3.7m, respectively; the maximum thaw depth of full-space pile foundation during the operation will have exceeded the depth of structure (2.5m), which might put the structure at risk; (3) the structure of cone-cylinder pile foundation could effectively preserve permafrost and avoid pile foundations failure; (4) the spacing of cone-cylinder pile foundations is reasonable and the interaction of temperature distribution among cone-cylinder pile foundations can be negligible.

Numerical Simulation of Deformation Pattern to Pile Raft Foundation

2011 ◽  
Vol 71-78 ◽  
pp. 4460-4462
Author(s):  
Ya Dong Chen ◽  
Xu Dong Wang ◽  
Yue Xin She ◽  
Jiang Dong Cai
Keyword(s):  
Numerical Simulation ◽  
Displacement Field ◽  
Pile Foundation ◽  
Deformation Pattern ◽  
Single Pile ◽  
Deep Foundation ◽  
Raft Foundation ◽  
Study Results ◽  
Good Consistency ◽  
Foundation Failure

ABAQUS is used to study the load-settlement characteristic and soil displacement field of the pile raft foundation. Numerical results are compared to the outputs from model test. The study results show that good consistency is obtained from the comparison of results between numerical simulation and model tests. Small pile space will weaken the single pile bearing capacity. The compress region is mainly centralized in the soil beneath the pile tip to the 3b space pile raft foundation, which presents a massive deep foundation failure pattern. As the increase of pile space, the compress region under cap shifts upward. The displacement influence depth of 6b space pile foundation is smaller than 3b space pile raft foundation, and it is destroyed by the lateral squeeze of the soil around piles.

scholarly journals Investigation of Redistribution of Pile Foundation Forces Under Successive Loading of Its Elements

2017 ◽  
Vol 27 (4) ◽  
pp. 121-129
Author(s):  
Vladimir Sedin ◽  
Kateryna Bikus ◽  
Vladislav Kovba
Keyword(s):  
Skin Friction ◽  
Pile Foundation ◽  
Side Surface ◽  
Test Results ◽  
Additional Loading ◽  
Laboratory Conditions ◽  
Foundation Model ◽  
Load Tests ◽  
Model Segment

Abstract Redistribution of pile foundation forces under successive loading of its elements was investigated under laboratory conditions. A segment of pile foundation model was taken for use in the case study. Load tests on the pile foundation model segment, without joining its elements (pile and plate, which turns into grillage) and based on different combinations of static loadings were conducted. This proved that the loading of a plate causes skin friction on some length of the pile side surface as well as providing additional loading and settlement. Test results have shown that application of successive elements enables the foundation to carry loads up to 13% higher than in the case of a standard pile foundation loading with the same settlement rates.

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.

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