Case study on pvd
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CASE STUDY FOR GROUND IMPROVEMENT USING PVD
Khem chand Gurjar2013CE10351
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Introduction
• To develop a new port at Gangavaram located
at about 15 kms south of Visakhapatnam Port, AP.
• Back up facilities for coal and iron ore storage and stacking and handling facilities.
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Site Description
Port facilities • Coal storage– 12m high
• Iron ore storage– 10m high
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Soil Profile
• As a part of the project, 8 Nos boreholes were taken to ascertain the design parameters.– Dredged Sand (0.2-0.3m thick)– Marine Clay with Shells (1-3m thick)– Soft Marine Clay (7-15m thick)
• The safe bearing capacity of the existing soil was worked out as 3 T/m² which was very low to take the loads.
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PVD Design• Depth : 10m to 18m• Spacing : (Triangular pattern)– 1m c/c in below the stack – 1.5m c/c in in other area
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Consolidation period For 1.5 m spacing : 174daysFor 1m spacing : 65 days
Sand mat 300 mm thickHorizontal Drainage System
Geotextile and band drains laid horizontally connecting these pipes
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Post Treatment Assessment
• The instruments as Piezometers, Settlement Recorders, Inclinometers were installed to assess the post treatment performance of the adopted method of treatment.
• The readings were taken every 4 days when loading started, continued for a month after final preload height is achieved. The frequency was later extended to 7 days.
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Pore water pressure
1 m c/c : 55-65%1.5 m c/c : 30-40%
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Settlement
Settlement with time
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Analysis
To determine the ultimate settlement they used two method– Asaoka Method:– Hyperbolic method:
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Asaoka Method
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Conclusion• With the application of the load the pore pressure
increased and dropped down slowly with time. The pore pressure variation indicated about 55–60% dissipation.
• The Degree of consolidation based on Asaoka Method was evaluated as 78–115% whereas based on Hyperbolic method it was evaluated as 32–70%.
• Hyperbolic Method is more comparable with the Pore Pressure Dissipation Results. Further the results obtained with theoretical slope of hyperbola as 1.00 are more closer to the predicted by pore water pressure analysis.
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Reference
Case study for ground improvement using PVD with preloading for coal & iron ore stackyard
• Pallavi Bhosle, Sohams Foundation Engg. Pvt. Ltd., Navi Mumbai–400614, India.E-mail: [email protected]
• V.V. Vaishampayan,MD, Sohams Foundation Engg. Pvt. Ltd., Navi Mumbai–400614, India.E-mail: [email protected]
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THANK YOU
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