CONTENTS

S. NO DETAILS PAGE NO.

1.0 INTRODUCTION 1

2.0 OBJECTIVES 1

3.0 LOCATION 1

4.0 GEOLOGY 3

5.0 EFFECTS OF BLASTING 4

5.1 Blast Induced Ground Vibrations Background 4

5.2 Factors Influencing Blast Induced Ground Vibrations 5

5.3 Permissible Limits of Blast Induced Ground Vibrations (PPV) for

Surface Structures 5

5.4 Ground Vibration Predictor Equations 7

5.5 Blast Induced Fly Rock 7

5.6 Control of Fly Rock 9

5.7 Blast Induced Air Blast / Noise 9

5.8 Human Perception 10

6.0 CONTROLLED BLASTING TECHNIQUES 10

7.0 BLAST VIBRATION MONITORING INSTRUMENTATION

(INSTANTEL DSS-077) 11

7.1 Instrument Description 11

8.0 INITIATION SYSTEMS 11

8.1 Electrical Initiation 12

8.1.1 Advantages of Electric Initiation System 12

8.1.2 Disadvantages of Electric Initiation System 12

8.2 Electric Delay Detonators 12

8.2.1 Advantages of Electric Delay Detonators 12

8.2.2 Disadvantages of Electric Delay Detonators 14

9.0 METHOD OF QUARRYING 14

10.0 SITE INVESTIGATIONS 14

11.0 OBSERVATIONS AND DISCUSSIONS 14

12.0 DATA ANALYSIS 16

13.0 CONCLUSION AND RECOMMENDATIONS 18

LIST OF TABLES

Table No Details Page No.

1. Natural frequency of surface civil structures after Central Mining and

Fuel Research Institute (CMFRI), (Report 1991). 5

2. Directorate General of Mines Safety (DGMS) (Tech) (S&T) Circular

No.7 of 1997} 6

3. USA Standard (after Siskind, et al, 1980) 6

4. Australian Standard 2008 (AS 2187.2) 6

5. German Standard (after German DIN 4150, 1986) 6

6. Current air blast limits is USA Office of Surface Mining Reclamation &

Enforcement 9

7. Details of blast hole parameters and explosives used during investigation

at S.F.No.118/7 16

8. Blasting details and blast induced vibration observation details at

S.F. No. 118/7 16

9. Scaled distance for maximum safe charge and peak particle velocity of

2.5 mm/sec 17

LIST OF FIGURES

Figure No. Details Page No.

1. Map showing the location of Rough stone quarry at S.F.No.118/7 and

surroundings 2

2. Fly-rock Generation 8

3. Electric Delay Detonators 13

4. Electric Delay Detonators Constructional features 13

5. Satellite imagery showing the Blast and Monitoring station locations in

the vicinity of Rough stone quarry at S.F.No.118/7 15

6. Regression line for the blast induced vibrations surrounding the rough

stone quarry 17

LIST OF ANNEXURES

S. No DETAILS PAGE No.

1. Event Report at Monitoring Station 1A 19

2. Event Report at Monitoring Station 1B 20

3. Event Report at Monitoring Station 2A 21

4. Event Report at Monitoring Station 2B 22

5. Event Report at Monitoring Station 3A 23

6. Event Report at Monitoring Station 3B 24

LIST OF PHOTOS

No. DESCRIPTION PAGE No.

1. 25

2. 25