Ground Improvement Techniques

May 5th, 2015
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Ground improvement is the most imaginative field of geotechnical engineering. It is a field in which the engineer forces the ground to adopt the project's requirements, by altering the natural state of the soil, instead of having to alter the design in response to the ground's natural limitations. The results usually include saving in construction cost and reduction of implementation time.

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soil compactionCE 353 Geotechnical EngineeringDr M. Touahmia6Soil CompactionLecture Outline:1.2.3.4.5.6.7.General PrinciplesStandard Proctor TestFactors Affecting CompactionModified Proctor TestField CompactionMeasurement of Field CompactionSpecial Compaction TechniquesTextbook: Braja M. Das, "Principles of Geotechnical Engineering", 7th E. (Chapter 6).1General PrinciplesWhat is compaction? Many types of earth construction, such as roads, railways, embankments, retaining walls, earth dams, and airport, require man-placed soils, or fills. These soils are loose (weak) and must be compacted to increase their strength characteristics. Soil compaction is defined as the method of mechanically increasing the density of soil by reducing volume of air.2General Principles The densification is accomplished by pressing the soil particles together into a close state of contact with air being expelled from the soil mass in the process, thereby increasing its unit weight. The degree of compaction is measured in terms of the dry unit weight (d). For a given water content (w), the maximum degree of compaction that can be achieved is when all of the air voids have been removed. The dry unit weight correlates with the degree of packing of the soil grains:G 1 eswd The smaller the void ratio (e) will be, the higher the dry unit weight (d) will be.3General PrinciplesObjectives of Co

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