Study on Pull-Out Resistance of Single-Belled Anchor in Layered Sand and Soft Silty-Clay Deposits: Model Tests and Numerical Modelling

2021 ◽  
pp. 121-137
Author(s):  
Tanaya Deb ◽  
Sujit Kumar Pal
Keyword(s):  
Numerical Modelling ◽  
Model Tests ◽  
Silty Clay ◽  
Pull Out ◽  
Clay Deposits

Application of an effective stress design method to concrete piles driven in Mexico City clay

2005 ◽  
Vol 42 (6) ◽  
pp. 1495-1508 ◽  
Author(s):  
Emilio E Saldivar ◽  
Richard J Jardine
Keyword(s):  
Mexico City ◽  
Effective Stress ◽  
Design Method ◽  
Friction Angle ◽  
Unit Weight ◽  
Silty Clay ◽  
Concrete Piles ◽  
Clay Deposits ◽  
Ground Conditions ◽  
Pile Load Tests

Piled foundations are used widely in the lake clay zones of Mexico City, with “friction” piles being driven into soft diatomaceous clay deposits that show an extraordinary range of mechanical properties. The paper assesses the applicability of the Imperial College pile (ICP) design method to the concrete piles driven in these deposits. After the ICP methodology and Mexico City ground conditions are reviewed, an experimental study is reported of the key soil properties required for the ICP procedures: yield stress ratio, unit weight, interface friction angle (δ), sensitivity (St), and intrinsic properties. The new data are then applied to a specially assembled database of static pile load tests from different Mexico City clay locations, with allowance being made for site-specific details and local installation procedures. A quantitative assessment shows that the ICP methodology is free from significant bias and leads to more reliable estimates of static capacity than the total stress (α) design method routinely used in Mexico City.Key words: validation, database, static axial pile capacity, driven friction pile, effective stress design, silty clay.

Studies on Soil Resistance to Pipelines Buried in Sand

2011 ◽  
Vol 243-249 ◽  
pp. 3151-3156 ◽  
Author(s):  
Run Liu ◽  
Lin Ping Guo ◽  
Shu Wang Yan ◽  
Yu Xu
Keyword(s):  
Failure Modes ◽  
Model Tests ◽  
Soil Resistance ◽  
Test Results ◽  
Buried Pipe ◽  
Pull Out ◽  
Soil Failure ◽  
Pipe Segment ◽  
Force Displacement ◽  
Peak Value

A series of model tests were carried out to investigate the soil resistance when the buried pipe segment moved in the sand. In the tests, the pipe segments were pulled out in vertical, lateral and axial directions and the pipe segments movement and soil resistance were recorded. Observed data show that the soil resistance depends on the pipe diameters and the depth of cover. According to the uplift test results, the force-displacement relationships with smaller depth of cover are greatly different from those with larger depth of cover. The results of the lateral sliding and axial pull out tests show that the soil resistance initially increases before a peak value is reached and then keeps the same level. For the same covered depth, the lateral soil resistance is more than twice that for uplift. According to the uplift test results, the soil failure modes with smaller depth of cover are greatly different from those with larger covered depth.

Quelques Caractéristiques Géologiques et Minéralogiques des Dépôts d'Argile du Nord-Ouest du Québec

1971 ◽  
Vol 8 (12) ◽  
pp. 1525-1541 ◽  
Author(s):  
Gérard Ballivy ◽  
Gaston Pouliot ◽  
André Loiselle
Keyword(s):  
Sea Water ◽  
Clay Fraction ◽  
Mineralogical Composition ◽  
Carbonate Content ◽  
Silty Clay ◽  
Left Bank ◽  
Marine Clay ◽  
Clay Deposits ◽  
Flow Slides ◽  
Lacustrine Clay

The clay deposits of Northwestern Quebec (from Matagami to Rupert House) were formed during the retreat of the Laurentian ice sheet. The oldest deposits are varved clays formed when the region was submerged by glacial Lake Barlow – Ojibway; the varved clays have been traced northward to Rupert House. A minor glacial surge (Cochrane stadial) extending southward to Matagami, partly covered and reworked the lacustrine clays; evidences of this glacial readvance were observed on the left bank of Rupert River near Rupert House. Following this glacial stage, the land was invaded by sea water (Tyrrell Sea) from which were deposited the silty clay that underlies much of the Hudson Bay Lowlands.The mineralogical composition of the marine clay differs from that of the lacustrine clay by its carbonate content: 30% against 2% or less for the lacustrine clay. The clay fraction of the two types of clays is made up of similar minerals which, in order of decreasing importance are: illite, chlorite, vermiculite, and kaolinite. The marine clay is coarser grained than the lacustrine clay and, locally, gives rise to important flow-slides. The slides are subcircular in shape and have a typical bottle-neck opening; they have never been observed to develop in the varved clays. Their occurrence in the marine clays would seem to depend principally on the microstructure of the material, a silty clay that is fissured at the surface. The flow-slides occur specially during the spring thaw when the ground is oversaturated with water.

Numerical Modelling of Steel Fibers Pull-Out

2022 ◽  
Author(s):  
Facundo Isla ◽  
Paula Argañaraz ◽  
Bibiana María Luccioni
Keyword(s):  
Numerical Modelling ◽  
Steel Fibers ◽  
Pull Out
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