Research on Rapid Evaluation of Rock Mass Quality Based on Ultrasonic Borehole Imaging Technology and Fractal Method

Table 1

RQD value and fractal box dimension Db value of drilling at different depths.

Sample number	Depth range	RQD	Fractal dimension
1	−1354.50∼−1354.85	92.3	2.047
2	−1354.85∼−1355.20	100	2.038
3	−1355.20∼−1355.55	54.1	2.092
4	−1355.55∼−1355.90	93.9	2.038
5	−1355.90∼−1356.25	76.1	2.062
6	−1356.25∼−1356.60	61.3	2.107
7	−1356.60∼−1356.95	83.4	2.077
8	−1356.95∼−1357.30	41	2.096
9	−1357.30∼−1357.65	19.7	2.17
10	−1357.65∼−1358.00	0	2.16
11	−1358.00∼−1358.35	73.7	2.077
12	−1358.35∼−1358.70	70.9	2.075
13	−1358.70∼−1359.05	71.1	2.065
14	−1359.05∼−1359.40	54.7	2.099
15	−1359.40∼−1359.75	82.3	2.08
16	−1359.75∼−1360.10	92	2.046