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GEO5

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Activity of Regions Below GWT

There are two cases to be considered when deactivating a region below the GWT.

1) The soil subjected to excavation is completely enclosed by active beam elements. The beam is then considered to be impermeable and both the soil and water are removed (removing total stresses - the inactive region is free of water). Owing to the impermeability of the beam elements, the pore pressure distribution remains unchanged, see the figure.

Pore pressure distribution after removing soil from region enclosed by active beams

2) The removed soil is not enclosed by beam elements. In such case, we assume that water in the excavated region is still active. This state is evident from the pore pressure distribution in the figure.

Pore pressure distribution after removing soil

Its effect can be removed by changing the groundwater table.

Pore pressure distribution after modifying the groundwater table

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