Download lagu How To Measure Rock Quality Designation Index RQD Procedure and Classification #education Mp3

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Title:	How To Measure Rock Quality Designation Index RQD Procedure and Classification #education
Contributing Artist:	Soil Mechanics and Engineering Geology
Album:	How To Measure Rock Quality Designation Index RQD Procedure and Classification #education - Single
Date:	08 January 2022
Duration:	3 Menit 30.00 detik
Type of file:	Audio MP3 (.mp3)
Audio Summary:	mp3, 44100 Hz, stereo, s16p, 128 kb/s

The rock quality designation index (or RQD) is a widely used index to describe the quality of rock in rock mass. RQD is the ratio between the sum of the length of core samples that are equal to or greater than 10 cm to the total length of the core run. This video shows how it is done in practice. The measurement starts at 0:01:19 Only two pieces had the length of equal or greater than 10 cm; the other (smaller pieces) were ignored. The total run was 1 m (or 1000 mm). The calculations include two pieces: 190 mm (19cm) + 145 mm (14.5 cm).
RQD=(190+145)/1000=0.335 or 33.5% (Poor quality).
Using an RQD value, the rock mass can be classified as follows:
RQD Rock mass quality
0- 25% Very poor
25-50% Poor
51-75% Fair
76-90% Good
91-100% Excellent
#engineering #geology #experiment #science
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