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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

During a field exploration program, rock was cored for a length of 4.5 m and the length of the rock core recovered was 2.5 m. All the rock pieces recovered having a length of 101.6 mm or more had a combined length of 2.1 m. Determine the recovery ratio and the rock quality designation. Use Table 17.9 to comment on the quality of the rock.

To determine

Find the recovery ratio and the rock quality designation and comment on the quality of rock.

Explanation

Given information:

The length of the rock core covered is 2.5m.

The length of coring is 4.5m.

Calculation:

Calculate the recovery ratio using the equation:

On the basis of the length of the rock core obtained from each run, the following quantities can be obtained for evaluation of the quality rock.

Recoveryratio=lengthof rockcore recoveredlengthofcoring×100

Substitute 2.5m for length of the rock core covered and 4.5m for length of coring.

Recoveryratio=2.54.5×100=0.5555×100=55.55%

Thus, the recovery ratio is 55

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