Study on Load-Bearing Mechanism of Stabilizing Pile-Groups by FEM and its Application

2014 ◽  
Vol 638-640 ◽  
pp. 656-670
Author(s):  
Huan Feng Qiu ◽  
Shao Jun Fu
Keyword(s):  
Computer Code ◽  
Soil Mass ◽  
Design Parameters ◽  
Pile Groups ◽  
Soil Pressure ◽  
Soil Arching ◽  
Fine Grained ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Pile Diameter

The behaviour of pile-groups subjected to lateral soil pressure is a key consideration in establishing the design parameters of pile-groups. In this paper, one representative section of the Chongqing Jiangdong slope is taken as an example. The existence of an arching zone around pile groups for granular and fine-grained soils is first examined using the finite element computer code CORE-3D. Pile load-displacement curves and the arching effect are considered together to explain how the stresses are transferred from the soil to the piles. The key parameters controlling the soil arching effect are centre-to-centre pile spacing (S), thickness of stable soil mass (H), depth (L) of pile embedment, pile diameter (D) and these were studied extensively. An empirical equation summarising the results is presented and the results have been adopted by the designer in practice.

Analysis of Behavior of Composite Foundation with Sparse Pile to Control Settlement

2012 ◽  
Vol 204-208 ◽  
pp. 674-679
Author(s):  
Jun Hui Zhang ◽  
Zhi Yong Yin ◽  
Jian Long Zheng
Keyword(s):  
Load Transfer ◽  
Computer Code ◽  
Differential Settlement ◽  
Composite Foundation ◽  
Soil Arching ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Rapid Construction ◽  
Membrane Effect ◽  
Pile Cap

The composite foundation with sparse piles to control settlement has been used to rapid construction and strict deformation of the structure widely currently, which can enhance the efficient of load transfer and decrease the differential settlement used with the geosynthetic. Considering the confine of analytical solution and the traditional method with a changeless modulus of geosynthetic and pile, the effects of the height of fill, the elastic modulus of geosynthetic and pile material on the differential settlement, embankment soil arching effect and tensioned membrane effect etc. are investigated using the computer code ABAQUS in this paper. The results indicate that the modulus of geosynthetic and pile has a notable influence on the differential settlement and the arching effect, which should be considered in the design. At the same time, the maximum tension in geosynthetic occurs near the edge of the pile cap.

Analysis of Settlement of Composite Foundation with Sparse Pile to Control Settlement

2012 ◽  
Vol 204-208 ◽  
pp. 664-669
Author(s):  
Jun Hui Zhang ◽  
Zhi Yong Yin ◽  
Jian Long Zheng
Keyword(s):  
Elastic Modulus ◽  
Significant Influence ◽  
Computer Code ◽  
Differential Settlement ◽  
Composite Foundation ◽  
Soil Arching ◽  
Maximum Settlement ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Pile Cap

The embankment soil arching effect of the composite foundation with sparse piles to control settlement is caused by the differential settlement between the embankment fill and the piles. So, the settlement is an important behaviour of the composite foundation. The effects of the height of embankment, the elastic modulus of geosynthetic and pile material, the stiffness of cushion and substratum, the pile cap and the distance of piles on the settlement are investigated using the computer code ABAQUS in this paper. The results indicate that the maximum settlement and differential settlement decrease with the elastic modulus of geosynthetic, the stiffness of cushion and substratum. The maximum settlement decreases and the differential settlement increases with the elastic modulus of pile material. At the same time, the differential settlement of the embankment surface decreases with the height of fill and there will be an equal settlement plane when the fill reaches certain height. In addition, the distance of piles has a more significant influence on settlement than the dimension of pile cap.

scholarly journals Analysis of Earth Pressure Variation for Partial Displacement of Retaining Wall

2021 ◽  
Vol 11 (9) ◽  
pp. 4152
Author(s):  
Hongbo Zhang ◽  
Mingpeng Liu ◽  
Pengfei Zhou ◽  
Zhizhong Zhao ◽  
Xiaoliang Li ◽  
...  
Keyword(s):  
Retaining Wall ◽  
Influence Factors ◽  
Earth Pressure ◽  
Soil Pressure ◽  
Soil Arching ◽  
Trap Door ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Displacement Mode ◽  
Partial Displacement

Parts of the retaining wall might produce displacement under different load conditions. The moveable wall could impact the adjacent fixed wall, mainly reflecting on the variation of earth pressure and formation of the soil arching effect. This paper conducted the horizontal trap-door test to explore the variation of active earth pressure caused by partial displacement of the retaining wall. Different trap-door width and three displacement modes were addressed as the influence factors. The results indicated that the horizontal soil arching effect was generated after the active displacement of the trap-door and the soil pressure was redistributed. The distribution of lateral soil pressure was approximately an “inverted bell” curve. For trap-door widths of 20 cm, 30 cm, and 40 cm, a secondary soil arching effect appeared in the test. The relationship between lateral earth pressure and displacement was different with the traditional limited theory due to the influence of the soil arching effect. The variation curve of earth pressure corresponding to displacement could be divided into three stages. In addition, the distribution of earth pressure along the trap-door height was non-linear. Trap-door width can significantly influence the maximum earth pressure on the fixed wall and the range where pressure changes. Finally, the effect of load sharing was explored and found to be related with displacement and width of trap-door as well as the displacement mode.

Analysis and Calculation of Earth Pressure Based on Nonlinear Theory

2014 ◽  
Vol 1055 ◽  
pp. 109-113
Author(s):  
Wen Zhang ◽  
Bin Zhang ◽  
Wei Hong Zhang ◽  
Sheng Wei Li ◽  
Yan Zhen Luo ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Retaining Wall ◽  
Test Material ◽  
Soil Pressure ◽  
Soil Arching ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Unit Model ◽  
Pressure Calculation ◽  
Non Linear

The results of the model test and field test which are proposed in soil pressure calculation indicate that soil pressure distribution is mostly non-linear. Using two models, the soil arching effect and horizontal unit by two theories of rigid retaining wall and non-linear soil pressure, combine with test material to calculate and analysis. The soil arching effect model calculated value on the upper part of retaining wall is higher than horizontal unit model, closer to the static soil pressure, which mainly relates to the upper part of the soil arching effect expresses in sufficiently. As the soil arching effect expresses in the lower part, its value is lower than horizontal unit model; both total soil pressure are the same; the resultant force point of the soil arching effect is higher than the horizontal unit model, the results of calculation and analyses are more well coincide to the virtual discipline. Basing on it, putting forward a kind of soil pressure calculation model which considers the space-time effect and reflects the soil pressure distribution is non-linear.

scholarly journals Pile-Spacing Calculation of Anti-Slide Pile Based on Soil Arching Effect

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
Guangfu Chen ◽  
Liangchao Zou ◽  
Qing Wang ◽  
Guodong Zhang
Keyword(s):  
Load Capacity ◽  
Limit Equilibrium ◽  
Interaction Mechanism ◽  
Soil Arching ◽  
Pile Spacing ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Engineering Designs ◽  
Practical Engineering ◽  
The Difference

Anti-slide pile is one of the most frequently used measures in landslide control globally. Pile-spacing has always been determined by the load capacity of single piles or according to engineering empirical experience. Many engineering practices and laboratory experiments show that the soil arching effect exists in landslide control with anti-slide piles. In this study, we aim to calculate pile-spacing in terms of the soil arching effect. We investigated the pile-soil interaction mechanism and propose that, at the limit, the pile-back soil arch resists landslide thrust only. According to Mohr–Coulomb strength theory and limit equilibrium theories, we derived a new pile-spacing calculation equation. We verified the derived pile-spacing calculation equation with real projects. The calculated results are similar to those of practical engineering designs, in which the difference is within 10%. The equation can be used in anti-slide pile preliminary design. This study can be a reference for pile-spacing calculation based on the soil arching effect.

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