Question 3 The densification of soils via compaction is one

Question #3 The densification of soils via compaction is one of the oldest and most widely used geotechnical engineering methods employed today. There are numerous methods for in-situ soil compaction and not all of them can be covered in class. Therefore, your assignment is the following: 1) Summarize three methods for field compaction used today. For each method selected include: a description of the technique, machinery required, applications, advantages and disadvantages. tons n the Type your answer for each method in paragraph form. Also include a summary of the three topics in the memo. No handwritten responses

Solution

Compaction : it is the process to increase the soil or field density in order to make it suitable for building, roads etc.

The volume of void space are reduced by different method of compaction. The choice of method will depend upon the soil type, thr maximum dry density required and economic consideration. Methods of field compaction used today are:

1. Tempers (impact load applied)

2. Rollers ( constant pressure applied)

3. Vibrators (vibratory force compaction)

Compaction depend on following factors.

- contact pressure

- No. Of passes

- thickness of layer

-speed of roller

Selection of equipment as per soil

weathered roak, well graded coarse soil

Application of compaction of soil

- increase load bearing capacity

-provide stability

-reduce settling of soil

-prevent soil settlement and frost change

-reduce water seepage, swelling and contraction

Equipment	suitable soil
Smooth steel drum roller	well graded sandsgravel, crushed rock, asphalt
Pneumatic tyred rollers	most coarse and fine soils
Sheep foot rollers	fine grained soils, sands and gravel with > 20% fines
Grid roller	weathered roak, well graded coarse soil
Vibrating plates	Coarse soils with 4-8% fines
Tampers and rammers	All soil types