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What is the importance of geotextiles and sand in reclamation works?

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For geotextiles used in reclamation, they serve mainly the following two purposes:

(i) they separate reclamation fill from marine mud;
(ii) they may act as reinforcement to enhance the stability of reclamation.

However, the reinforcement function is still under heated debate because its performance as reinforcement depends on several factors like the directional strength of woven geotextiles and damage effect by installation of vertical band drains.

For sand:
(i) it spreads the load of future public dump on top of it;
(ii) it acts as drainage path for dissipation of excess pore water pressure for band drain installation.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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