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What is the effect of preloading on settlement in soft soils?

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Question: What is the effect of preloading on settlement in soft soils?

Options:

  1. Increases immediate settlement
  2. Reduces long-term settlement
  3. Has no effect
  4. Increases shear strength

Correct Answer: Reduces long-term settlement

Solution: 

Preloading reduces long-term settlement in soft soils by accelerating consolidation and allowing excess pore water pressure to dissipate before construction.

What is the effect of preloading on settlement in soft soils?

Practice Questions

Q1
What is the effect of preloading on settlement in soft soils?
  1. Increases immediate settlement
  2. Reduces long-term settlement
  3. Has no effect
  4. Increases shear strength

Questions & Step-by-Step Solutions

What is the effect of preloading on settlement in soft soils?
  • Step 1: Understand what soft soils are. Soft soils are types of ground that can easily compress or settle when weight is applied.
  • Step 2: Learn about settlement. Settlement is when the ground sinks or lowers due to the weight of buildings or other structures.
  • Step 3: Know what preloading means. Preloading is the process of applying extra weight to the ground before building to prepare it for the actual structure.
  • Step 4: Realize how preloading helps. By adding extra weight, preloading speeds up the process of consolidation, which is when the soil gets denser and reduces the amount of water in it.
  • Step 5: Understand pore water pressure. In soft soils, there is water in the spaces between soil particles. When weight is added, this water pressure increases.
  • Step 6: See the effect of preloading. Preloading allows the excess water pressure to decrease (or dissipate) before the actual construction starts.
  • Step 7: Conclude the benefits. By reducing the water pressure and allowing the soil to settle before building, preloading helps to minimize long-term settlement after the structure is built.
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