Question

Consider the following properties for a soil sampler:
1. Area ratio should be low.
2. Cutting edge should be thick.
3. Inside clearance should be high.
4. Outside clearance should be low.
The properties necessary for a good quality soil sampler would include

• A. 1 and 4
• B. 1, 2 and 4
• C. 2, 3 and 4
• D. 1,3 and 4

Answer 1

The correct option is A 1 and 4

Area ratio is the most critical factor which affects sample disturbance. It indicates the ratio of displaced volume of soil to that of the soil sample collected. If $A_r$ is less than 10%, the sample disturbance is supposed to be small. Inside clearance should be 1 to 3%. Outside clearance should not be much greater than inside clearance and its value should lie between 0 to 2%.