Types of boring
1. Auger Boring
2. Wash boring
3. Rotary boring
1. Auger Boring
It is used in cursive and another soft side above the water table
The hand auger is used for up to above 6 meter
Mechanically operated auger is used for credit and they can also use in gravelly soil
Sample recovered from the soil brought by Auger are badly disturbed and are useful for identification purpose only
2. Wash boring
it is a fast and simple method for advancing hole in the type of soil
rock cannot be penetrated by this method
This method consists in first driving a causing the through which a hollow drill rod with a sharp chapping bit at the lower end is inserted
Water is forced under pressure through the drill rod which is alternately raised and also rotated
The resulting chapping active of the bit and water disintegrate the soil
The cutting is forced Up To ground surface in the form of soil water slurry through the annular space between the drill rod
The sample recovered from the wash water is all most Value less for interpreting the correct Geotechnical properties of the soil
3. Rotary boring
Rotary boring is a very fast method of heart wants a hole in Rock
A drill bit fixed to the lower end of the training rod is protected and is always kept in contact with the bottom of the hole
A drilling mud, usually a water solution of Bentonite with or without other at mixture is continuously for forced down the Hollow drill rod
The mud returning awards bring the cutting to the surface the method is also known as mud totally drilling and the hole usually required no causing
Rotating core barrels, provided with commercial diamond stud ed bits are also used for rotary building and obtaining the rock sample
The method is also known as core values drilling
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