Question

For gravel, what is the most suitable borehole type?

Answer 1

The most suitable borehole will be drilled borehole by Percussion boring.

Percussion boring is done by breaking up formation by repeated blows of a heavy bit or a chisel inside casing pipe. Borehole is usually kept dry except for limited quantity of water used to form slurry of pulverized material. The pulverized material is bailed out using bailer or sand pump. Unless sides of borehole are likely to cave in a casing pipe is not necessary. Sometimes in percussion drilling drill rods are replaced by cables