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Auger boring is most suitable for __________ type of work.
Air field pavement
Highway exploration
Dam construction
Buildings
Highway exploration
Auger boring is a shallow soil exploration method used primarily to obtain disturbed soil samples. It is most efficient and commonly employed for highway exploration, where large areas need to be surveyed for subgrade characteristics at shallow depths.
Auger boring is a shallow soil exploration method used primarily to obtain disturbed soil samples. It is most efficient and commonly employed for highway exploration, where large areas need to be surveyed for subgrade characteristics at shallow depths.
dbтАЛ<HgтАЛ тАФ Depth of borehole is usually limited by the ground water table or stiffness
╧Д=c+╧Гtan(╧Х) тАФ Shear strength governing soil stability during boring
The auger (helical or post-hole type) is rotated into the ground to loosen and lift soil to the surface. It works by manual or mechanical rotation; as the blades penetrate, soil is captured between the flights and brought up for visual classification and laboratory testing. This is ideal for soft to stiff cohesive soils where the borehole remains stable without support.
Auger boring is suitable for shallow exploration (usually up to 6m depth).
It is not suitable for very soft, saturated, or gravelly soils where borehole collapse occurs.
Used extensively in highway engineering for subgrade assessment.
Provides disturbed samples, which are sufficient for index property tests.
Quick and economical
No specialized equipment required for shallow depth
Provides representative disturbed samples
Not suitable for hard rock or stony soils
Boreholes tend to collapse in loose sands below water table
Limited depth of investigation
Highway subgrade investigation
Preliminary foundation soil screening
Agricultural soil testing
Augers are classified as helical (continuous flight) or post-hole (bucket) types.
Option D (Buildings) usually requires deeper investigation (e.g., wash boring or rotary drilling) to determine load-bearing capacity at greater depths.
B is correct тАФ Auger boring is the standard, cost-effective choice for shallow soil exploration required during highway route alignment.
Always remember: Auger boring = shallow/disturbed, while Rotary drilling = deep/undisturbed (required for high-rise or heavy structures like dams).