Table 1 Charge distribution table of upper step Blasthole.

From: Study on the influence of blasting on the structural stability of newly-built and adjacent tunnels

Serial number

Blasting site

Classification of blastholes

Hole spacing E (cm)

Line of resistance W (cm)

Quantity (units)

Detonator segment

Blasthole depth m

Charge concentration q (kg/m)

Single hole charge (kg)

Section charge (kg)

Charge structure

1

Up the steps

Cut hole 1

70

60

6

1

1.8

0.7

1.3

7.6

Continuous

2

Cut hole 2

70

60

6

3

1.8

0.7

1.3

7.6

Continuous

3

Auxiliary hole 1

120

110

8

5

1.5

0.5

0.8

6.0

Continuous

4

Auxiliary hole 2

120

110

10

7

1.5

0.5

0.8

7.5

Continuous

5

Auxiliary hole 3

120

110

12

9

1.5

0.5

0.8

9.0

Continuous

6

Peripheral hole

65

55

31

11

1.6

0.1

0.2

3.8

Interval

7

Bottom plate hole

115

100

13

13

1.6

0.2

0.3

2.2

Interval

8

TOTAL

  

73

    

43.7

 
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