3.36. A site consists of 3 m thick loose sand with an in- "situ void ratio of 0.75. The laboratory tests show that the maximum and minimum void ratios of the sand are 0.85 and 0.50, respectively. Based on the b or field SPT value of 5, this soil will be liquefiable at an earthquake magnitude of 6.5. Vibrocompaction method with granular backfill is proposed to densify to this soil. Assume the diameter of granular columns is 0.75 m. To minimize the liquefaction potential, the t densified soil should have an SPT N value of 20, which h u corresponds to the relative density of 70%. Assume the A ground settles 40 mm after the densification. Find the oira required spacing of granular columns.
3.36. A site consists of 3 m thick loose sand with an in- "situ void ratio of 0.75. The laboratory tests show that the maximum and minimum void ratios of the sand are 0.85 and 0.50, respectively. Based on the b or field SPT value of 5, this soil will be liquefiable at an earthquake magnitude of 6.5. Vibrocompaction method with granular backfill is proposed to densify to this soil. Assume the diameter of granular columns is 0.75 m. To minimize the liquefaction potential, the t densified soil should have an SPT N value of 20, which h u corresponds to the relative density of 70%. Assume the A ground settles 40 mm after the densification. Find the oira required spacing of granular columns.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:3.36. A site consists of 3 m thick loose sand with an in-
situ void ratio of 0.75. The laboratory tests show
that the maximum and minimum void ratios of the
sand are 0.85 and 0.50, respectively. Based on the
field SPT value of 5, this soil will be liquefiable
at an earthquake magnitude of 6.5. Vibrocompaction
method with granular backfill is proposed to densify
this soil. Assume the diameter of granular columns
is 0.75 m. To minimize the liquefaction potential, the
st densified soil should have an SPT N value of 20, which
corresponds to the relative density of 70%. Assume the
ground settles 40 mm after the densífication. Find the
required spacing of granular columns.
om
21
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