What Is Soil Compressibility and Settlement?

TL;DR

Soil compressibility refers to the reduction in volume when soil is subjected to compressive forces, while settlement is the vertical movement of a structure due to this volume decrease. Compaction is a temporary process to improve soil before construction, whereas consolidation is a continuous, natural process that occurs post-construction, involving multiple stages of soil compression.

Transcript

hello everyone in this video we are going to discuss compressibility and settlement of the soil from the chapter consolidation of soils so in this video we are going to discuss the concept of compressibility and settlement so let us discuss what is compressibility of the soil when a soil mass is subjected to a compressive force its volume decreases... Read More

Key Insights

• 💦 Compressibility of soil occurs due to compression of solid particles, expulsion of air, and expansion of water in voids.
• 📉 Settlement refers to the downward movement of a structure caused by soil compression.
• 👷 Compaction is a deliberate, instantaneous process done before construction, while consolidation is a natural, gradual process that occurs after construction.
• 🗂️ Consolidation is divided into stages: initial consolidation, primary consolidation, and secondary consolidation.
• 💦 Initial consolidation involves compression of solid particles, water, and air.
• 💦 Primary consolidation is caused by the expulsion of water.
• ❓ Secondary consolidation occurs due to the plastic readjustment of solid particles.

Questions & Answers

Q: What is compressibility of soil?

Compressibility of soil refers to the decrease in volume when soil is subjected to a compressive force. It occurs due to compression of solid particles, expulsion of air, and expansion of water in voids.

Q: How does settlement affect structures?

Settlement refers to the vertical downward movement of a structure due to soil volume decrease. As the soil compresses, the structure positioned on it moves downward, potentially causing structural damage.

Q: How does compaction differ from consolidation?

Compaction is a deliberate, instantaneous process done before construction to improve soil properties. Consolidation is a natural, gradual process that occurs after construction, causing long-term soil compression.

Q: What are the stages of consolidation?

The stages of consolidation are initial consolidation, primary consolidation, and secondary consolidation. Initial consolidation involves compression of solid particles, water, and air. Primary consolidation is caused by the expulsion of water, and secondary consolidation is due to the plastic readjustment of solid particles.

Summary & Key Takeaways

• Compressibility of soil refers to the decrease in volume when soil is subjected to compressive force, while settlement is the vertical downward movement of a structure due to soil volume decrease.

• Soil consists of solid particles, water, and air, with compressibility occurring due to compression of solid particles, expulsion of air, and expansion of water in voids.

• Compaction is a deliberate, instantaneous process done before construction to improve soil properties, while consolidation is a natural, gradual process that occurs after construction.