A surcharge and sand drain installation is proposed for an airport project to accelerate the consolidation of a thick deposit of fine-grained soil underlying the construction area. The plan is to install sand drains 1.5 ft in diameter at a staggered spacing so that each sand drain will handle a plan area 15 ft in diameter. Laboratory tests indicate that the coefficient of consolidation for horizontal drainage of the soil is 0.5 ft2/day. Computations indicate that the surcharge load will cause an eventual settlement of 12 in. How long a period will be required for 90 percent of this settlement to take place?

Q: H= Co settlement occurred in the first of 5 minutes, for the same consolidation of drainage, how…

A: H = 2.4 cm or 0.024 mt50 = 5 min

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A: Given Data:d=1.5inu=60%t=8min 10sec

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A: Answer Calculation of Total Primary Consolidation Settlement We know that the  Primary consolidation…

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A:

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A: Context: Scouring in sedimentation tank

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A:

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A: sec 234(2) (f) are the sloping requirements of a type 3 soil.

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Q: Why may lowering groundwater table induce settlement?

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A:

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A:

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.