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In plate load test preloading recommended by IS code is:
- A70 gm/cm2
- B100 gm/cm2
- C120 gm/cm2
- D125 gm/cm2
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A minimum seating pressure or preload of 70 g/cm2 (0.7 t/m2), shall be applied and removed before starting the load test.
Then the load is applied with regular increment, using hydraulic jacks. Usually the increment is about 1/5th of the estimated safe bearing capacity of the soil.
Then the load is applied with regular increment, using hydraulic jacks. Usually the increment is about 1/5th of the estimated safe bearing capacity of the soil.