Table 2 The %error comparison for the selected data points between the drill-RQD and the CSAMT-RQD.

From: Development of deep-underground engineering structures via 2D and 3D RQD prediction using non-invasive CSAMT

CSAMT data points (selected)

Drilling data

%Error

CSAMT sounding number

Resistivity (Ωm)

Predicted RQD’ (%) using Eq. 2

Predicted RQD” (%) using Eqs. 3 and 4

Borehole name

Depth

(m)

Measured RQD (%)

RQD’ vs. RQD

RQD” vs. RQD

A5

486

47

35

W1

25

37

21

5

A5

782

63

63

W1

115

61

3

3

C8

610

55

44

W2

10

43

22

2

C8

1035

72

73

W2

130

77

7

5

D2

942

69

70

W3

85

72

4

3

D2

1661

87

91

W3

150

91

4

0

D15

75

1

8

W4

25

6

83

25

D15

163

12

14

W4

85

15

20

7

E15

879

66

67

W5

60

69

4

3

E15

1490

84

87

W5

200

90

7

3

E21

326

34

25

W6

80

24

29

4

E21

535

50

39

W6

120

38

24

3

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