Blasting Masterclass30 September 2014

Portal Design: Managing energy in a developing metropolis

WealthUnearthed

Scope of Presentation

• Ho Man Tin (HOM) Project location – Portal cross cut station in Hong Kong

• Project Organogram

• Blasting Requirements and design

• Comparisons of different initiating systems and the outcomes

• Conclusion

MTRC (Mass Transit Railway Corporation)

ARUP (consulting)

Nishimatsu Construction Company

AECOM (consulting)

Archie Mining Services (AMS)

Mines Division

Project Organogram

How does AEL fit into this?

HOM Bench Blasting History Dimensions Max Min Avg

Burden 1.3 m

Spacing 1.3 m

Pattern Square& Staggered

Diameter 51 mm

SmartShot™ detonators blasted 260 27 104

Holes blasted 128 25 75

Rows per blast 10 2 7

Holes / row 21 5 12

Bench height 8.0 2.5 4.8

Powder factor kg/m3 0.450 0.240 0.345

Bench area m2 520 41 143

Bench volume m3 1725 164 596

Blast design

Managing energy to execute effective blasting

VB1 77.4m

VB2 76.3m

VB3 99.4m

VB4 138.3m

VB5 113.2mVB6 118.9m

VB7 103.5m

VB8 44.7m

VB9 54.1m

VB10 123.6m

VB10A 163.6m

VB11 65.5m

VB12 54.3m

VB13 95.4m

VB14 74.6m

VB15 83.9m

VB16 130.5m

VB17 113.5m

VB18 142.6m

VB19 66.9m

VB20 153.3m

VB21 202.9m

VB22 133.5m

VB23 86.9m

VB24 139.7m

VB25 160.1m

VB26 105.3m

VB27 73.6m

VB28 128.1m

VB29 170m

Cavern1 135.9m

Shaft 248m

HOM box-cut:29 Vibration monitoring stations

Monitor locations for the HOM cross cut Portal

• 29 Monitoring stations

• Minimum of 6 recorders on during any blast

• IS – Shock Tube

• EIS – SmartShot™ combined with ViewShot™

Top view

VB8

Side view

0

10

20

30

40

50

60

1 2 3 4 5 6 7 8 9

PPV (

mm

/s)

9 Blast sample points

Shock Tube vs SmartShot™ on VB844.7 m from center of blast

Shock Tube

SmartShot™

PPV Limit

Vibration level comparison between the two initiating systems

0

1

2

3

4

5

6

7

8

1 2 3 4 5 6 7 8 9

MIC

(k

g)

9 Blast sample points

Shock Tube vs SmartShot™ 44.7 m from center of blast

MIC Used

(Shocktube)

MIC Allowed

(Shocktube)

MIC used (SS)

MIC allowed (SS)

Maximum Instantaneous Charge

Energy controlled with accuracy

0

1

2

3

4

5

6

7

8

9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Dri

ll d

ep

th a

chie

ve

d

(m)

Double deck blasts

Double deck – Shock Tube vs SmartShot™

Shocktube achieved depth

SmartShot™ achieved depth

Product m

Shock Tube average depth 4.79

SmartShot™ average depth 6.93

Average advance gained with electronics 2.15

Benefits of Multiple Decks

Accurate control of energy delivered the advance

0

5

10

15

20

25

30

0

20

40

60

80

100

120

140

160

1 5 9

13

17

21

25

29

33

37

41

45

49

53

57

61

65

69

73

77

81

85

89

93

97

101

105

109

113

117

121

125

129

133

137

141

145

149

AO

P (

dBL)

Number of blasts

Blast log of AOP control

PPV vs AOP

AOP

PPV

Single layer rubber mat BL45 Double layer rubber mat BL108

Air Overpressure Control

Attenuating energies in confined spaces

Time lapse of daily operations

0

20

40

60

80

100

120

140

160

0

20

40

60

80

100

120

140

1 5 9

13

17

21

25

29

33

37

41

45

49

53

57

61

65

69

73

77

81

85

89

93

97

10

1

10

5

10

9

11

3

11

7

12

1

12

5

12

9

13

3

13

7

14

1

14

5

14

9

Hole

s p

er b

last

Number of blasts

Increase in blast hole numbers

No of Holes PPV AOP Linear (No of Holes )

Single layer rubber mat BL45 Double layer rubber mat BL108

Shock Tube SmartShot™

Pattern size increase

Expanding exploration with controlled energy

Blast volume comparison over 10 months

2012

Shock Tube

Blasts

Shock Tube

m3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

June 3 651 245 203 203

July 1 203 203

Aug 3 1088 375 341 372

Sept 5 1379 216 372 372 210 210

Oct 9 3045 372 372 210 372 233 372 372 372 372

Nov 7 2222 372 338 278 339 278 278 339

Dec 5 1724 278 365 372 338 372

Jan 5 2082 372 372 446 446 446

Feb 5 1822 372 372 372 372 335

March 1 372 372

Total 44 14588

2013

SmartShot™

Blasts

SmartShot™

m3

March 7 2737 339 339 345 345 355 406 608

April 14 7444 521 595 804 597 434 741 564 408 347 446 651 333 515 488

May 17 7401 409 449 164 490 389 271 787 575 513 330 484 415 409 566 217 446 487

June 14 9365 507 227 563 939 636 930 803 370 902 747 982 268 520 971

July 13 9418 862 692 578 804 905 924 572 741 702 446 730 416 1046

August 12 6606 469 789 541 433 654 461 495 491 283 787 436 766

Sept 12 9114 559 805 486 956 781 953 924 186 686 1088 952 739

Oct 12 8464 632 686 766 745 405 827 672 851 749 712 1045 374

Nov 11 12000 1059 938 489 672 562 580 1430 1413 1725 1656 1476

Dec 5 4252 1625 664 1036 326 601

Total 117 76801

Shock Tube vs SmartShot™

426 % increase in material extraction with electronics

• Zero misfires recorded• Zero Flyrock

Relax, we have everything under control….

Acknowledgements

Control of environmental impact achieved.Product confidence attained by all parties concerned.

Conclusion

Thank You

Correct product understanding, planning and application is proving to deliver boundless possibilities.Investigations into three or more decks should be done for future use of EIS.