Madagascar Prefabricated Drains and Soil Stabilisation Methods

 

A significant difference between prefabricated drains and conventional pipe drains is their structure. Prefabricated drains usually have a plastic core, a filter sleeve, and a system of vertical channels. In contrast, pipes are usually made of a single material. The width of the Colbond drain is substantially larger and its permeability boundary is lower than that of a conventional pipe drain.

Prefabricated drains in Madagascar were first introduced to geotechnical engineering in the early 1930s. The first one on the market was the Kjeilman card'board wick, which consisted of two cardboard strips with ten longitudinal grooves. It was installed using a special machine. Prefabricated drains are very efficient and can speed up the consolidation process.

Prefabricated drains are often used in soft ground improvement projects. They contain a plastic core and geotextile that acts as a filter. They are available in a variety of sizes and are designed for specific conditions. Their placement can be adapted according to the type of ground, consolidation, and the intended water flow. For shallow ground, static installation methods are used; for deeper ground, static-dynamic installation is used. The mandrel assembly is then attached to the arm of an excavator or crane.

Prefabricated vertical drains have a geotextile encasing a plastic core. These types of drains are often used in conjunction with surcharging, a technique used to pre load soft soils. The purpose of surcharging is to increase the pressure of pore water before it drains away. Surcharging takes several years, and prefabricated drains help speed up this process.

PVDs are effective at increasing consolidation of the surrounding soil. However, their discharge capacity may be reduced if the PVD is clogged. The clogging effect can be minimized by choosing a filter with appropriate properties. Larger channels with higher capacity are less susceptible to clogging. In addition, soil consolidation can cause the PVD to kink and bend.

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