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- 1. Environmental Concerns at Colorado School of Mines Explosive Research Laboratory<br />Presented by: <br />Nicholas Matthews, AXPRO Group<br />Mining Engineering Undergraduate at Colorado School of Minesnmatthew@mines.edu<br />Presented to: <br />MNGN 407<br />Saturday February 20, 2010<br />
- 2. Special Thanks<br />To Colin Matheson, of Matheson Mining Consultants, for his generous support, and also to Damian Murphy of Oldcastle Materials.<br />
- 3. CSM Explosives Research Laboratory<br />Established in 2007 <br />Predominantly Surface Blasts<br />Initial Limit Set at a 20 lb limit<br />
- 4. Location<br />
- 5. Location<br />
- 6. Location<br />
- 7. Reason for Study<br />Inhabited buildings in the area<br />CSM Edgar Mine<br />
- 8. Safety Zone of Environmental Effects<br />Air Blast<br />Decibels<br />Ground Vibrations<br />PPV<br />frequency<br />
- 9. Prediction of PPV<br />Equations<br />Legend<br />PPV = peak particle velocity<br />H = a unit-less site constant, <br />R = radius<br />Q = charge weight<br />n= site constant, equal to the slope of the log-log trend line<br />Z = Scale Distance <br />
- 10. Instrumentation<br />
- 11. Instrumentation<br />Range: up to 10 in/s (254 mm/s)<br />Accuracy: +/- 5% or .02 in/sec (0.5 mm/sec)<br />Frequency Range: 2 to 250 Hz<br />Settings used:<br />Continuous Record<br />.125 mm/s (.005 in/sec) trigger<br />
- 12. Experimental Setups to Determine Site Specific Parameters<br />
- 13. Experimental Setups to Determine Site Specific Parameters<br />Station: 1 2 3 4 5 6 7 <br />ScaleDist: <br />1020 30 405060 70<br />*Each represents one blasting monitor (geophone +/- microphone)<br />
- 14. Experimental Setups to Determine Site Specific Parameters<br />60<br />10<br />50<br />30<br />40<br />20<br />
- 15. Experimental Setups to Determine Site Specific Parameters<br />
- 16. Experimental Setups to Determine Site Specific Parameters<br />Towards Seismographs<br />Towards Seismographs<br />
- 17. Experimental Setups to Determine Site Specific Parameters<br />
- 18. Experimental Setups to Determine Site Specific Parameters<br />Post Blast Crater—20 g Booster<br />
- 19.
- 20.
- 21.
- 22. Site Constants<br />n = -1.04 <br />H= 305.21 <br />Z = Scale Distance<br />PPV = 305.21*Z-1.04<br />
- 23. Research Office<br />
- 24. 1.0 in/sec<br />
- 25. Elevation Studies<br />Effect on PPV<br />How much PPV is affected<br />Range of effects from elevation change<br />
- 26. Elevation Scale Distances<br />60.43<br />45.05<br />21.26<br />15.19<br />19.7°<br />20.6°<br />56.57<br />42.42<br />30<br />40<br />
- 27. 30<br />40<br />
- 28. 30=<br />~10.65<br />~12.25<br />Monitor Scale Distances:<br />40=<br />~15.7<br />~14.3<br />~15.0<br />~6.83<br />~2.5<br />Average PPVs at Seismographs<br />
- 29. Horizontal Vs. Elev.<br />
- 30. Conclusions<br />Elevation Can drastically affect PPV<br />Below vs. Above<br />
- 31. Further Testing<br />More Studies at Elevation<br />More accurate air blast readings to complete model<br />Using new pressure gauges and data acquisition system<br />
- 32. Further Testing<br />
- 33. QUESTIONS?<br />Thank you for listening.<br />
- 34. References<br />Attewell, 1964 P.B. Attewell, Recording and interpretation of shock effects in rock, Min. Miner. Eng. 1 (1964), pp. 21–28 (USA). (Attewell)<br />Davies et al., 1964 B. Davies, I.W. Farmer and P.B. Attewell, Ground vibration from shallow sub-surface blast, The Engineer 217 (1964), pp. 553–559 (London, UK). (Davies)<br />Daemen, 1983 Daemen, J.J.K., 1983. Ground and air vibrations caused by surface blasting. USBM report prepared by Department of Mining and Geological Engineering, University of Arizona, Tucson, AZ 85721, USA. (Daemen)<br />E.I. du Pont de Nemours & Company. 1900s. Blaster's handbook. Wilmington, Del: E.I. du Pont de Nemours, pp 591-622. (du Pont).<br />Google. "Edgar Mine--Idaho Springs, CO." 39° 44' 49.53" N and 105° 31' 30.98" W Google Earth. November 5, 2004. October 3, 2009. (Google)<br />Instantel. "Event Report". Blastware 10.02, Xmark Corporation. 2009. October 8, 2009. (Instantel)<br />Khandelwal and Singh, 2007 M. Khandelwal and T. Singh, Evaluation of blast-induced ground vibration predictors, Soil Dynamics and Earthquake Engineering 27 (2007), pp. 116–125. (Khandelwal)<br />Moris, 1950 Moris, G., 1950. Vibration due to blasting and their effects on building structure. The Engineer 394–395 (London). (Moris)<br />R. Nateghi, M. Kiany, O. Gholipouri, Control negative effects of blasting waves on concrete of the structures by analyzing of parameters of ground vibration, Tunnelling and Underground Space Technology, Volume 24, Issue 6, November 2009 (Nateghi)<br />Olofsson, 1998 S. Olofsson, Applied Explosive Technology for Construction and Mining, Publisher APPLEX (1998). (Olofsson)<br />Pal Roy, 2005 P. Pal Roy, Rock Blasting Effects and Operations, Balkema Publisher (2005). (Pal Roy)<br />United States, and D. E. Siskind. 1980. Structure response and damage produced by ground vibration from surface mine blasting. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines. (Siskind)<br />Sivarajan et al., 2007 V. Sivarajan, K.L.D.S. Kumara, H.M.S.D. Hearath and N.W.P. Nanayakare, Ground vibration and air blast overpressure assessment using scaled distance, Proceedings of ERE (2007), pp. 33–36. (Sivarajan)<br />

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