Assignment 1 Questions and Answers.

Assignment 1 Questions and Answers.
What are the 4 main types of drill rigs? - Answer 1. highway

2. offroad

3. over-water

4. portable



What are the 4 main types of drilling? - Answer 1. solid stem continuous flight auger

2. hollow stem continuous flight auger

3. mud rotary

4. coring



What is drilling 'mud' and what are the 3 primary functions it serves? - Answer Mud Rotary
Drilling: pushes cuttings to the surface, helps support bore hole



1. holds hole open

2. carries cuttings to the surface

3. lubricates bit/erodes soil



What are the 4 main soil sampling methods? - Answer 1. split spoon sampler

2. pitcher sampler

3. thin-walled sampler (Shelby tube)

4. piston/osterberg sampler



What is the best type of drilling for obtaining 'UNDISTURBED' soil samples BELOW the WATER
TABLE? - Answer mud rotary



What is the best type of soil sampling method for obtaining 'UNDISTURBED' samples in SOFT
CLAY? - Answer piston/osterberg sampler



What is the best type of soil sampling method for obtaining 'UNDISTURBED' samples in STIFF
OVER-CONSOLIDATED CLAY? - Answer pitcher sampler



Complete the following sentence:

The Standard Penetration Test (SPT) blow count value (N-value) is obtained by driving a
______________ sampler a total of ______________ inches into the soil using at
_______________ pound hammer dropped from a height of _____________ inches. The N