VACUUM CONSOLIDATION – Vacuum Consolidation
Vacuum Consolidation is a soft soil ground improvement method that is typically combined with Prefabricated Vertical Drains and Horizontal Drains (PVD+VCM) and basically is a solution to replace the use of a surcharge. Further to the installation of the PVD, it consists of the application of a suction force with vacuum to an isolated mass of soil in order to reduce the atmospheric pressure and excess water pore pressure present in the soil, resulting in a consolidation of the soil, an increase in the effective stresses without modifying the total state stresses. The vacuum consolidation system consists of the installation of a drainage system (PVD) and Horizontal Drains, an isolation system and vacuum pumps. Once initialized, the vacuum is quickly distributed in the soil through the drainage system, reducing atmospheric pressure and excess pore pressure, creating a pressure differential between the prefabricated vertical drains (PVD) and the pore pressure present in the soils. This difference in pressures causes the water to flow vertically through the drain, causing a consolidation effect. Because the force used is a result from the vacuum effect of the atmospheric pressure, VCM eliminates the need of the surcharge after installation of the PVD´s and thus, it eliminates the associated costs of the surcharging process.
VACUUM CONSOLIDATION
APPLICABLE SOILS & DEPTH OF IMPROVEMENT The Vacuum Consolidation Method (VCM) is applicable for very soft to soft clays or silty clays with water and plasticity content. These types of soils are typically deemed unsuitable for any engineering use and on many occasions are recommended to be removed from site and to be replaced with expensive granular soils. With VCM, the “bad soil” becomes treatable and consequently useful for engineering purposes. The depth is limited by the thickness of the soft deposit and the capacity of the PVD installing machine. VCM projects can have depths of treatment in the range of 10, 15, 20, or 35m and even up to 45m. Advantages Relatively fast, relatively inexpensive compared to surcharging. The loading process commences immediately after completion of installation of the pumps and sealing (compared to weeks of waiting with surcharging). The performance can be monitored in real time. Disadvantages This method is not so effective if there are sand layers present deep into the soft deposit. Shallow sand or permeable layers can be overcome with a slurry wall isolation system. This method requires careful monitoring during the installation of the membrane to prevent vacuum leakage.
Frequently Asked Questions: VACUUM CONSOLIDATION
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1What are the primary applications and operating benefits of the VACUUM CONSOLIDATION in Bangladesh?
2What powertrain and technical specifications drive the VACUUM CONSOLIDATION?
3Is Earthmoving Solution Limited an authorized distributor with genuine factory warranty for VACUUM CONSOLIDATION?
4How quickly can genuine spare parts and mobile engineers be dispatched for the VACUUM CONSOLIDATION?
5How can corporate buyers request a quotation, commercial pricing, or financing for the VACUUM CONSOLIDATION?
6Does Earthmoving Solution Limited provide on-site commissioning and operator training for the VACUUM CONSOLIDATION?
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VIBRO COMPACTION
Ground improvement techniques are geotechnical construction methodologies that modify and enhance the engineering properties of the soil mass by improving one or more of the following parameters: Increase in the soil density and shear strength, decrease of the compressibility, reduction of settlement (total and differential), increase in the soil bearing capacity, acceleration of the consolidation process, increasing the factor of safety against liquefaction in case of an earthquake and generally, restrengthening of the soils. There are a number of Ground Improvement Techniques available for different types of soils, different purposes and project requirements.
VERTICAL WICK DRAIN
Vertical Wick Drains are the most economical ground improvement solution for soft soils with a high clay/silt content. CeTeau manufactures and installs Prefabricated Vertical Drains (PVD) to accelerate the settlement of soft soils. In combination with surcharge or vacuum pressure, the time required to reach the settlement is reduced from years to only months. “Consolidation you can build on.”
PVC SHEET PILES
CeTeau PVC sheet piling systems are the new standard with many advantages compared to hard wood, concrete and steel sheet piling. Vinyl sheet piles are made of poly vinyl chloride also known as PVC: a material with excellent resistance to weather influences and it has a long service life. Moreover, the material will not be affected by natural forces occurring in the ground, rodents, and salt or fresh water. PVC sheet piling has a number of benefits over traditional steel timber or concrete piling, including, costs, durability, ease of handling and a reduced environmental impact.
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