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What is the primary cause of settlement in saturated soils?

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Question: What is the primary cause of settlement in saturated soils?

Options:

  1. Soil compaction
  2. Consolidation due to pore water pressure dissipation
  3. Soil erosion
  4. Soil expansion

Correct Answer: Consolidation due to pore water pressure dissipation

Solution: 

Settlement in saturated soils primarily occurs due to consolidation, which is the process of pore water pressure dissipating over time, leading to a reduction in volume.

What is the primary cause of settlement in saturated soils?

Practice Questions

Q1
What is the primary cause of settlement in saturated soils?
  1. Soil compaction
  2. Consolidation due to pore water pressure dissipation
  3. Soil erosion
  4. Soil expansion

Questions & Step-by-Step Solutions

What is the primary cause of settlement in saturated soils?
  • Step 1: Understand what saturated soils are. Saturated soils are soils that are completely filled with water in their pores.
  • Step 2: Learn about pore water pressure. This is the pressure exerted by water within the soil's pores.
  • Step 3: Know what consolidation means. Consolidation is the process where soil volume decreases over time as water is expelled from the pores.
  • Step 4: Realize that when weight is added to saturated soil (like a building), it increases pore water pressure.
  • Step 5: Understand that over time, the pore water pressure decreases as water slowly drains out, allowing the soil particles to move closer together.
  • Step 6: Recognize that this movement of soil particles closer together leads to settlement, which is the sinking or lowering of the ground.
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