Experimental investigation of the uplift behaviour of circular plate anchors embedded in sand

2002 ◽  
Vol 39 (3) ◽  
pp. 648-664 ◽  
Author(s):  
K Ilamparuthi ◽  
E A Dickin ◽  
K Muthukrisnaiah
Keyword(s):  
Experimental Investigation ◽  
Circular Plate ◽  
Large Scale ◽  
Alternative Methods ◽  
Scale Model ◽  
Uplift Capacity ◽  
Rupture Surface ◽  
Sand Surface ◽  
Plate Anchors ◽  
Loose Medium

An experimental investigation of the uplift behaviour of relatively large scale model circular plate anchors up to 400 mm in diameter embedded in loose, medium-dense, and dense dry sand is described. Uplift capacity is strongly influenced by anchor diameter, embedment ratio, and sand density. In tests on shallow half-cut models, a gently curved rupture surface emerged from the top edge of the anchor to the sand surface at approximately ϕ/2 to the vertical, where ϕ is the angle of shearing resistance. For a deep anchor, a balloon-shaped rupture surface emerged at 0.8ϕ to the vertical immediately above the anchor and was confined within the sand bed. The load-displacement behaviour of full-shaped models was three-phase and two-phase for shallow and deep anchors, respectively. Alternative methods of determining the critical embedment ratio are considered, and values of 4.8, 5.9, and 6.8 are proposed for loose, medium-dense, and dense sand, respectively. Empirical equations are presented which yield breakout factors similar to those from many published laboratory and field studies.Key words: circular anchor, uplift capacity, sand, critical embedment ratio, failure mechanism.

The Influence of Geometry of Pedestal Piles in Silt on Uplift Behavior

2014 ◽  
Vol 680 ◽  
pp. 426-429 ◽  
Author(s):  
Dong Xue Hao ◽  
Jin Zhong Zhang ◽  
Rong Chen
Keyword(s):  
Large Scale ◽  
Soil Surface ◽  
Uplift Capacity ◽  
Maximum Difference ◽  
Rupture Surface ◽  
Uplift Load ◽  
Plate Anchor

The uplift behavior of rigid pedestal pile is affected by the geometry, which is not totally same with plate anchor. A series of uplift tests of relatively large scale pile models with various dimensions in silt soil have been conducted to investigate the influence of angles of enlarged base, ratio of base and shaft diameters and embedment ratios. The whole trend is that uplift capacity will decrease with the increase of angle of enlarged base. The maximum difference of ultimate uplift load for various angles of enlarged base is within 20%. Soil surrounding pile base can be mobilized when ratio of base and shaft diameters is no less than 2.0, otherwise the part of enlarged base will not take effect fully. A gently curved rupture surface emerged from the edge of enlarged base to soil surface when embedment ratio is no more than 3. For deep rigid pedestal pile, a balloon-shaped rupture surface occurred. The height of whole rupture is 2.7D.

Experimental Investigation of Mooring Line Loading Using Large and Small-Scale Models

2000 ◽  
Vol 123 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Neil Kitney ◽  
David T. Brown
Keyword(s):  
Experimental Investigation ◽  
Large Scale ◽  
Model Tests ◽  
Scale Model ◽  
Mooring Line ◽  
Small Scale ◽  
The European Union ◽  
Single Chain ◽  
Mooring Lines ◽  
Highly Nonlinear

For catenary mooring lines, the relationship between excursion of the point of suspension and the length of suspended line is highly nonlinear. If the point of suspension is then set in motion, the velocity of the line resulting from a change in catenary profile induces additional nonlinear hydrodynamic loading components. The sensitivity of the mooring line to initial and oscillatory conditions results in a complicated tension history at the point of suspension, with line tensions possibly greatly exceeding those predicted by static analyses. This paper presents results from an experimental investigation into the response of a large (1:16) and small (1:70) scale single-chain catenary model mooring line when subject to a comprehensive, and equivalent, range of excitation parameters. Tests were performed at purpose-built test facilities. Small-scale model tests were carried out at University College London (UCL). Large-scale model mooring line tests were completed at the Ship Dynamics Laboratory, Canal de Experiencias Hidrodinamicas de El Pardo (CEHIPAR), Madrid, Spain. Funding for the model tests performed in Spain was provided through the European Union Access to Large Scale Facilities—Training and Mobilisation of Researchers Program.

RANCANG BANGUN PERANGKAT EKSPERIMENTASI PROSES PIROLISIS BIOMASA GELOMBANG MIKRO

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Noor Fachrizal
Keyword(s):  
Large Scale ◽  
Continuous Model ◽  
Biomass Energy ◽  
Scale Model ◽  
Small Scale ◽  
Laboratory Apparatus ◽  
Liquid Form ◽  
Large Scale Model ◽  
Bio Oil ◽  
Pyrolysis Of Biomass

Biomass such as agriculture waste and urban waste are enormous potency as energy resources instead of enviromental problem. organic waste can be converted into energy in the form of liquid fuel, solid, and syngas by using of pyrolysis technique. Pyrolysis process can yield higher liquid form when the process can be drifted into fast and flash response. It can be solved by using microwave heating method. This research is started from developing an experimentation laboratory apparatus of microwave-assisted pyrolysis of biomass energy conversion system, and conducting preliminary experiments for gaining the proof that this method can be established for driving the process properly and safely. Modifying commercial oven into laboratory apparatus has been done, it works safely, and initial experiments have been carried out, process yields bio-oil and charcoal shortly, several parameters are achieved. Some further experiments are still needed for more detail parameters. Theresults may be used to design small-scale continuous model of productionsystem, which then can be developed into large-scale model that applicable for comercial use.

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