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A platform for research: civil engineering, architecture and urbanism
Determination of Smear Zone around Vertical Drains
Installation of prefabricated vertical drains (PVDs) using a mandrel causes disturbance of clay surrounding the drain, resulting in a "smear" zone of reduced permeability. In this paper, an attempt is made to determine the extent of smear zone using large-scale laboratory model tests. Two tests — simulating the cases of "no smear" and "with smear" — were conducted. Excess pore water pressures were monitored at seven different locations along the radial direction. In addition, several moisture content samples were collected at various locations in the clay layer for the estimation of the void ratio of the clay layer. The distribution of excess pore pressure due to drain installation gave a clear indication of the extent of smear zone. The effect of reconsolidation of the clay was found to be much greater than that of the remolding of the clay. The extent of smear zone was also confirmed from the change in void ratio of the clay layer in the smear zone obtained from moisture content measurements. It was found that the radius of the smear zone is about four times the radius of the mandrel.
Determination of Smear Zone around Vertical Drains
Installation of prefabricated vertical drains (PVDs) using a mandrel causes disturbance of clay surrounding the drain, resulting in a "smear" zone of reduced permeability. In this paper, an attempt is made to determine the extent of smear zone using large-scale laboratory model tests. Two tests — simulating the cases of "no smear" and "with smear" — were conducted. Excess pore water pressures were monitored at seven different locations along the radial direction. In addition, several moisture content samples were collected at various locations in the clay layer for the estimation of the void ratio of the clay layer. The distribution of excess pore pressure due to drain installation gave a clear indication of the extent of smear zone. The effect of reconsolidation of the clay was found to be much greater than that of the remolding of the clay. The extent of smear zone was also confirmed from the change in void ratio of the clay layer in the smear zone obtained from moisture content measurements. It was found that the radius of the smear zone is about four times the radius of the mandrel.
Determination of Smear Zone around Vertical Drains
Sharma, Jitendrapal (author) / Xiao, Daping (author)
Soft Ground Technology Conference ; 2000 ; Noordwijkerhout, the Netherlands
Soft Ground Technology ; 270-279
2001-03-30
Conference paper
Electronic Resource
English
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