In one core run of 1500 mm selected from cores obtained during drilling for a bridge foundation in hard limestone, the following core recovery information was obtained:
Core Recovery (mm) | Length of Core Pieces > 100 mm |
250 | 150 |
50 | |
50 | |
M | |
100 | 100 |
125 | 125 |
75 | |
100 | 100 |
150 | 150 |
100 | 100 |
50 | |
125 | 125 |
Sum = | Sum = |
Determine (a) the percent core recovery, and (b) the RQD. Based on this RQD, what is the rock quality? Why?
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