Analysis of pile group behaviour due to excavtion induced ground movements

2012 ◽  
pp. 581-586
Author(s):  
R Nishanthan ◽  
D Liyanapathirana ◽  
C Leo
Keyword(s):  
Pile Group ◽  
Ground Movements ◽  
Group Behaviour

scholarly journals Numerical modelling of perimeter pile groups in clay

2013 ◽  
Vol 50 (3) ◽  
pp. 250-258 ◽  
Author(s):  
A.V. Rose ◽  
R.N. Taylor ◽  
M.H. El Naggar
Keyword(s):  
Load Distribution ◽  
Load Capacity ◽  
Relative Effectiveness ◽  
Pile Group ◽  
Block Type ◽  
Pile Groups ◽  
Total Load ◽  
Group Behaviour ◽  
Pile Interaction ◽  
Spacing Length

The load distribution among piles in a group varies such that the inner piles often carry a smaller share of the total load compared to the outer piles, which is a result of increased soil–pile interaction. The main objective of this paper is to establish the relative effectiveness of pile groups with no inner piles (perimeter group), when compared to the more common grid configuration. The numerical investigation utilized the finite element programme ABAQUS and considered a range of variables that affect pile group behaviour including number of piles, pile spacing, length/diameter ratio, and soil strength. It was demonstrated that a complete grid group is less efficient than a perimeter group, where efficiency is defined as the load capacity of the whole group expressed as a ratio of the number of piles in the group multiplied by the load capacity of a single isolated pile. Efficiencies close to unity were observed for some perimeter groups. Perimeter groups also showed that a “block” type group failure could occur, where piles were placed at a spacing of less than 2.0 pile diameters,d, centre-to-centre. This often, but not always, led to a reduction in the efficiency of the pile group.

A Soil Foundation Interaction Model for the Analysis of Pile Group Behaviour

2002 ◽  
Vol 12 (1) ◽  
pp. 40-46
Author(s):  
Maurizio Lenzi ◽  
Andrea Gambi ◽  
Giancarlo Olivucci
Keyword(s):  
Interaction Model ◽  
Pile Group ◽  
Group Behaviour ◽  
Soil Foundation

scholarly journals Performance of driven battered mini-pile group against expansive soil induced ground movement

2020 ◽  
Vol 195 ◽  
pp. 01030
Author(s):  
Shirin Aminzadeh Bostani Taleshani ◽  
Robert Evans ◽  
Emad Gad ◽  
Mahdi Miri Disfani
Keyword(s):  
Field Trial ◽  
Structural Damage ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Cost Effective ◽  
Pile Group ◽  
Ground Movement ◽  
Ground Movements ◽  
Moisture Variation ◽  
The Impact

Swell-shrink movement of expansive soils due to seasonal wetting and drying can cause differential ground movements. This movement can inflict substantial structural damage above foundation level to lightly loaded infrastructure. To reduce this movement, techniques have been employed to either (i) chemically restrain the soil’s reactivity, (ii) control the moisture variation within the ground, or (iii) engage a footing system that can limit the impact of the stresses generated by such differential ground movements. Recently, a new concrete-free footing system has been developed in Australia in an attempt to sufficiently resist such ground movements. This system is comprised of an adjustable steel plate attached to the ground by multiple thin steel (hollow) battered mini-piles. The technology shows promise as a low-impact, cost-effective, excavation and concrete-free, innovative alternative to traditional footing systems. It is also quick and easy to install without the use of bulky and expensive equipment. Early field trial results have indicated that this new footing system can combat against and significantly reduce the transfer of the swell-shrink ground movements to a structure. This paper will describe this new footing system and report on an experimental field trial to date, which will include measured ground movements, moisture content and soil suction results vs. depth, as well as the performance of this new driven battered mini-pile group footing system.

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