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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

In order to hasten consolidation time periods a combination of sand drains and surcharging has been used since the 1930s. Sand drains are vertical columns of high-permeability sand or gravel that are installed continuously through the fine-grained subsoil that is causing the problem. A preconstruction fill, called a surcharge loading, is then placed over the entire site covering the sand drains. This surcharge mobilizes excess pore pressures in the soil water, which then flows horizontally to the sand drain, and then vertically within the sand drain to eventually escape through a sand blanket or other permeable horizontal stratum.  1, record 1, English, - preconstruction%20fill

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

Travaux préparatoires (...) Amélioration du sol en surface (...) Dans certains cas, construction en zone inondable, par exemple, il est parfois nécessaire de rehausser le niveau général du sol de plusieurs mètres. On réalise alors un remblai par mise en place de couches successives, dont l'épaisseur (...) est fonction de la nature des matériaux constitutifs et de la puissance des engins de compactage utilisés (...)  2, record 1, French, - remblai%20pr%C3%A9paratoire

Record 1,  Textual support,  Spanish