Alidrain prefabricated vertical drain
Engineers are often required to build on sites which consist of fine grained, saturated soils that have poor drainage properties. If the soil is not strengthened in advance, the added weight of a new structure will result in unacceptable levels of settlement and instability.
To prevent problems associated with excess settlement, it is important that excess pore pressures are removed from the soft foundation soils. Consolidation of these soils can take in excess of 20 years. The installation of Alidrain prefabricated vertical drains (PVD) provide a shorter and easier drainage path for the pore water to drain. This speeds up consolidation period for the foundation soil which gain sufficient shear strength to support the structure above. This substantial reduction in time taken to consolidate the soft foundation soil speeds up access to the site reducing projects costs for the client.
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Alidrain prefabricated vertical drain comprises a synthetic drainage core wrapped with a durable fabric of excellent filtration properties for accelerated consolidation of soft soil. The drainage core structure has a high resistance to the lateral loads applied by the surrounding soils during consolidation.
To prevent later problems of excess settlement, it is important that excess pore pressures be removed from soft foundation soils within a short time frame. This ensures that foundation shear strength is increased quickly to support embankment and fill loading. However, soft compressible foundation soils have a low hydraulic conductivity and it takes a long time for excess pore pressures to dissipate and the soil to consolidate.
To reduce consolidation time, Alidrain prefabricated vertical drains (PVD) are installed to provide a shorter and easier drainage path for the pore water to drain. This speeds up consolidation and the soft foundation gains in shear strength quickly.
During the consolidation process, lateral soil displacements can cause drains to elongate while vertical soil compression may cause drains to fold and buckle. Alidrain is designed to perform under these extreme loading's to maintain the drainage path for efficient drainage of the foundation soils.
The synthetic core of Alidrain and geotextile filter vary throughout the range of Alidrain PVD's to meet the expected design drainage requirements for a wide range of soil loads and soil conditions.
Supplied in the following grade
||AD200 / AD300
||0.1m x 250m