Civil and Building Engineering.

1 Wash-Boring Technique: The use of wash borings is the most common method for advancing a boring
because the technique is applicable to any soil, the depth is limited only by the equipment employed, samples can be taken with a variety of tools, and in situ tests can be performed as the borehole is advanced...

2 Continuous-Flight Auger with Hollow Core: Borings to limited depths can be made with a continuous-flight auger driven by a powered rotary table...