7CE6.2   GROUND IMPROVEMENT TECHNIQUES                                    L 3

Unit 1

Introduction:

Formation of soil, major soil types, collapsible soil, expansive soil, reclaimed soil,

sanitary land fill, ground improvements; objective, potential.

General principles of compaction:

Mechanics, field procedure, quality control in field.

Unit 2

Ground Improvement in Granular soil:

In-place densification by

(a)  Vibro floatation (b) Compaction piles in sand(c) Vibro compaction piles (d)Dynamic

compaction  (e) Blasting

Unit 3

Ground improvement in cohesive soil:

Preloading with or without vertical drains.

Compressibility vertical and radial consolidation, Rate of consolidation, Preloading methods.

Types of drains, Design of vertical drains, Construction techniques.

Stone column:

Function, Design principles, load carrying capacity, construction techniques,

settlement of stone column foundation.

Unit 4

Ground Improvement by Grouting & Soil Reinforcement :

Grouting in soil: Types of grout,

desirable characteristics, Grouting pressure, Grouting methods.

Soil Reinforcement – Mechanism, Types of reinforcing elements, Reinforcement- Soil

interaction, Reinforcement of soil beneath roads, foundation.

Unit 5

Soil Stabilization:

Lime Stabilization

– Base Exchange mechanism, Pozzolonic reaction, lime-soil interaction, lime

columns, Design of foundation on lime column.

Cement stabilization