Study of a possible alternative progettual solution of Dubai s Palm.

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Katherine Stewart
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1 Study of a possible alternative progettual solution of Dubai s Palm

Seismic risk in Dubai Dubai located in the northern part of

because of the particular position near one of the most

seismic activity The prevalent cohesionless character of soils

the development of seismic site effects Bandar-e-Abbas

in the planning and monitoring of the territory urbanisation,

seismicity and the geological nature of deposits will be

semplified schematic representation of two possible modality

2 Seismic risk in Dubai Dubai located in the northern part of United Arab Emirates (UAE) between Arabian Gulf and Oman Gulf, because of the particular position near one of the most seismotectonic areas, is subjected to the effects of the seismic activity The prevalent cohesionless character of soils and their usually weak consolidation, has great importance in the development of seismic site effects Bandar-e-Abbas 10/09/2008 M=61Richter 61 This conditions put several problems in the planning and monitoring of the territory urbanisation, since that several phenomenons closely related to the seismicity and the geological nature of deposits will be interest the structures insistent As example we report a semplified schematic representation of two possible modality of construction of Dubai s Palm putting in evidence the various aspects inherent the two possible solutions

Illustrated representation of Palm section The Dubai s Palm project for the construction of the artificial islands has estimate the employment of a lot of amounts of sand that t is

also problems related to the stability, erosion and mantenance of the structural features of the island Here we propose to study the possible advantages who results adopting an

3 Illustrated representation of Palm section The Dubai s Palm project for the construction of the artificial islands has estimate the employment of a lot of amounts of sand that t is dredged d d from bottom of sea and was sprayed from dredging ships for realization of the artificial structures Naturally this has required besides the problem of finding raw materials, also problems related to the stability, erosion and mantenance of the structural features of the island Here we propose to study the possible advantages who results adopting an alternative solution, which h provide the employment of a basal stratum t formed by blocks mixed with thin material to ensure maximum density, instead of only sand for all structure thickness SL SL SL SL

4 Illustrated representation of Palm section (Settlements) - Original plan W 1 W 1 W 0 = settlement of the basal plane W 1 = settlement of sand at sea level interface = settlement of sand at surface W 0 W = W 0 + W 1 + W = W consolidation - Alternative plan The total settlement will be related to the consolidation of sand at various interfaces level W 1 W 0 0 W 1 0 W=W The total settlement will be limited to the upper level of sand, since than the lower will be has a negligible settlement Reclamation base W 0

Illustrated representation of Palm section (Liquefaction and lateral spreading) The

of thin saturated sands with low degree of consolidation As consequence the porewater

liquefaction occurs Irregular settlement causes damage until collapse of structures Kobe

thickness giving possible lateral spreading phenomenons SF SF Liquefaction is inhibited for

5 Illustrated representation of Palm section (Liquefaction and lateral spreading) The phenomenon of liquefaction take great importance where earthquake waves interesting deposits of thin saturated sands with low degree of consolidation As consequence the porewater pressures quickly increased, reducing until to cancel the effective stress and the flow liquefaction occurs Irregular settlement causes damage until collapse of structures Kobe Higher urbanisation High risk zone SF Liquefaction can interest the construction for all thickness giving possible lateral spreading phenomenons SF SF Liquefaction is inhibited for the upper level formed by sand since that there isn t a saturated stratum and risk of lateral spreading is also reduced SF

and wind, can meaningfull causes regressing of coastal line and than reduce the width of

6 Illustrated representation of Palm section (Erosion) Another aspect to hold in consideration is the erosion of the island s boundaries This action mainly operating by mean of the waves and wind, can meaningfull causes regressing of coastal line and than reduce the width of beach Erosion can involves the entire thickness of sand Erosion is limited to the upper layer of sand

Illustrated representation of Palm section (Vibrocompaction) In order to prevent the risk

potential of an area With reference only at geological characteristics is clear how the

thickening, during an earthquake, favours increase in pore pressure A method to obtain a

L S L L S F In this case will be used a vertical depth vibrocompaction method S F S F In

7 Illustrated representation of Palm section (Vibrocompaction) In order to prevent the risk of liquefaction is useful to adopt measures necessary to reduce the liquefaction potential of an area With reference only at geological characteristics is clear how the deposit s density affects his susceptibility at liquefaction, since that loose thickening, during an earthquake, favours increase in pore pressure A method to obtain a mitigation of liquefaction potential is that to use vibrocompaction S Pressure S bulb S L L S L L S F In this case will be used a vertical depth vibrocompaction method S F S F In this case will be used a horizontal dynamic vibrocompaction method for thicken the superficial sandy level S F

Seismic Responses of Liquefiable Sandy Ground with Silt Layers

Journal of Applied Science and Engineering, Vol. 16, No. 1, pp. 9 14 (2013) 9 Seismic Responses of Liquefiable Sandy Ground with Silt Layers H. T. Chen 1 *, B. C. Ridla 2, R. M. Simatupang 2 and C. J.