Vertical Wick Drain- case study 47
Why a Vertical Wick Drains is Used: Vertical wick drains are one of the most used drains, which are employed as drain column in vertical drainage system. They also known as PV drain as well as prefabricated vertical drains. In the modern times, construction sector is dependent on the nature of soil. Fine-grained soils such as soft silt and clay frequently create severe problems in construction.
Due to this, Vertical wick drains are used for accelerating the solidification, settlement and strengthening of fine-grained or soft soils to speed up construction as well as to curb long-term settlement. If Vertical wick drains are not used, then consolidation of fine-grained soil may takes years, which will seriously affect construction. How Vertical Wick Drains Works: Vertical wick drains has plastic core wrapped in geo-textile fabric.
They are deeply inserted in fine-grained soil or saturated soil in combination with pre-loading to form drainage medium in the soil. Preloading is defined as process of soil compression subject to applied vertical stress. This process is undertaken prior to construction, to avoid any loopholes during construction.
Due to Vertical wick drains, the process of preload is shortened to months; otherwise, it may take years to consolidate soil. Water will escape through the settlement of the preload and helps induce consolidation, compression and settlement in the soil. One of the important things, which Vertical Wick Drains does, is that it creates an artificial or free path through which water easily reaches free drainage and in the process, the time of settlement and consolidation of soil decreases massively.
The whole process helps engineers to initiate the construction work as soon as possible without waiting for months or years. How Vertical Wick Drain is Installed: The prefabricated vertical wick drains are installed with the help of stitchers, which are especially created to ease the installment procedure and they are mounted on cranes. The mandrel of crane tightly hold vertical wick drain and it is hydraulically pushed in vertical direction in the ground to the preferred depth up to the bottom of the fine-grained soil layer.
The mandrel is carefully removed without disturbing the wick drain arrangement and the vertical wick drain is left in the soil to perform his job. Vertical Wick Drain Application: Wick drain are included in buildings, warehouses, storage tanks, dams, large storage areas, airport runways, levees, highway and roadway embankments, abutments, marine terminals, tanks, bridges, waste sites and many more places.
However, the most common application of Vertical Wick Drains is consolidation, solidification and settlement of fine-grained or soft soil so that construction can start immediately. They are cost effective and can be installed in very less amount of period.
They even require less workers and it is mostly preferred over horizontal wick drains.