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Load Settlement Behaviour of Soft Soil with 3D-Reinforced Sand Piles
Nowadays due to scarcity of land, structures are built in sites with the available soil conditions including soft soil layers. In site conditions where deep foundations are not a viable solution due to economic considerations, the existing foundation soil has to be modified for better bearing capacity and reduced settlement. In the present scenario, a wide variety of ground improvement techniques is available including modification by inclusions and confinement. The use of sand piles is a proven technique to improve the desirable properties of soft soil. In this study, the effectiveness of sand piles is further improved by introducing 3D elements into the sand piles. A series of laboratory plate load tests were conducted on a model footing resting on soft clay reinforced with sand pile with and without 3D elements in it. The tests were conducted using two different shapes of 3D elements, namely tetrapod and pentapod. Also, tests were conducted for different volume ratios of 3D elements as 1.82, 2.27 and 2.73% at a constant relative density. Between the two shapes, pentapod elements were more effective due to better confinement of soil between the legs owing to the geometry. Also, the bearing capacity is improved by increasing the volume content of 3D elements from 1.82 to 2.73%. From the results, it can be found that for clay only, the bearing capacity at a settlement ratio of 4% is 94.86 kN/m2. The bearing capacity of the clay is improved to 122.76 kN/m2 when reinforced with sand pile only at 50% relative density. For same relative density of sand pile, the bearing capacity of clay is improved to 167.40 and 212.04 kN/m2 for sand piles-reinforced tetrapod and pentapod elements, respectively, at volume content of 2.73%. This shows that 3D elements can be effectively used in sand piles for improving the properties of soft clay.
Load Settlement Behaviour of Soft Soil with 3D-Reinforced Sand Piles
Nowadays due to scarcity of land, structures are built in sites with the available soil conditions including soft soil layers. In site conditions where deep foundations are not a viable solution due to economic considerations, the existing foundation soil has to be modified for better bearing capacity and reduced settlement. In the present scenario, a wide variety of ground improvement techniques is available including modification by inclusions and confinement. The use of sand piles is a proven technique to improve the desirable properties of soft soil. In this study, the effectiveness of sand piles is further improved by introducing 3D elements into the sand piles. A series of laboratory plate load tests were conducted on a model footing resting on soft clay reinforced with sand pile with and without 3D elements in it. The tests were conducted using two different shapes of 3D elements, namely tetrapod and pentapod. Also, tests were conducted for different volume ratios of 3D elements as 1.82, 2.27 and 2.73% at a constant relative density. Between the two shapes, pentapod elements were more effective due to better confinement of soil between the legs owing to the geometry. Also, the bearing capacity is improved by increasing the volume content of 3D elements from 1.82 to 2.73%. From the results, it can be found that for clay only, the bearing capacity at a settlement ratio of 4% is 94.86 kN/m2. The bearing capacity of the clay is improved to 122.76 kN/m2 when reinforced with sand pile only at 50% relative density. For same relative density of sand pile, the bearing capacity of clay is improved to 167.40 and 212.04 kN/m2 for sand piles-reinforced tetrapod and pentapod elements, respectively, at volume content of 2.73%. This shows that 3D elements can be effectively used in sand piles for improving the properties of soft clay.
Load Settlement Behaviour of Soft Soil with 3D-Reinforced Sand Piles
Lecture Notes in Civil Engineering
Patel, Satyajit (editor) / Solanki, C. H. (editor) / Reddy, Krishna R. (editor) / Shukla, Sanjay Kumar (editor) / Megha, O. (author) / Sandeep, M. N. (author) / Beena, K. S. (author)
2021-04-25
10 pages
Article/Chapter (Book)
Electronic Resource
English
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