Determination and applications of rock quality designation …
Fig. 4 shows the variation of RQD with the length of sampling line L for discontinuity frequency λ = 10 m −1 and length threshold t = 0.1 m. It can be seen that when L is smaller than about 0.5 m, RQD increases significantly as L increases. When L is larger than 0.5 m, RQD changes slightly with L.Therefore, it is important to use sampling lines …
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