blast log evaluation program (blep) - osmre.gov · blast log evaluation program (blep) ......
TRANSCRIPT
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Blast Log Evaluation Program (BLEP)
Office of Surface Mining
Appalachian Region And
Technical Innovations and Professional Services (TIPS)
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Administratium (Heaviest element known to man)
Welcome WR Facilities Hotel Breaks Vouchers Notebook Class Agenda Sign-in Introductions
Who, Where, What do you do? Experience with blast logs?
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Blasting Logs and Adverse Effects
Ken Eltschlager (412) 937-2169
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What we are here to review
Important components of the blast log to control the adverse effects of blasting Flyrock Ground vibrations Airblast (Fumes)
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Why is this important?
Prevent injury to people
Prevent damage to property
Required by SMCRA
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Global overview
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Review – Blasting, Seismology and Acoustics
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Overview of Blast Logs
The Blast
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Bad News…
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Good News……
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Confinement
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Charge weight per delay
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Delay Sequence (surface and down hole)
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Blast logs #1 piece of evidence
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Why Should Blasters Keep Good Logs??
Regulations say so
Quality control
Liability protection
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Overview of blast energy
Seismic speed – 3,000 – 25,000 ft/s
Air or sound speed – 1,100 ft/s
Flyrock – Faster than you can run!
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** SAFEGUARD SEISMIC UNIT 2000DK ** SN: 2243
DATE: 09/12/95 Event: 009 Client: ROBERTSON
TIME: 15:18:06 Recording Time: 10
Operation: BUCKEYE IND. MINING CO. SSU Location: ROBERTSON YARD Distance to blast: 1385 Operator: M.MANN/ODNR Comments: Trigger Level: .05 IN/SEC
VELOCITY WAVEFORM GRAPH SCALE TIME - 100 MSEC PER MARK
Summary L
PPV (in/sec) 0.10 PO (in x.001) 2.39 PPA (g) .02 FREQ (Hz) 8.0 RESULTANT PPV (in/sec): PEAK AIR PRESSURE: (dB)
(psi)
T 0.14 2.97
.02 7.6
0.15 114
0.00145
SHAKETABLE CALIBRATED: 06/20/95 By GeoSonics, Inc.
v 0.07 1.38
.02 16.6
SEISMIC - +/- .64 IN/SEC SOUND - +/- 0.00232 PSI
Box 779, Warrendale, PA 15095 U.S.A. TEL: 412.934.2900 FAX: 412.934.2999
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Vibrations arrive at a house
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Structure Response
Ground vibrations and airblast make homes shake or vibrate.
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Blast Log Review and
Blasting Seismograph Data
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Scaled Distance Relationship
To evaluate ground vibrations and airblast
GV – Square root scaled distance
SD2 = D/CW1/2
AB – Cubed root scaled distance
SD3 = D/CW1/3
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Compliance House, 450’
Complaint House, 550’
Complaint House 2, 1500’
Spatial Relationships
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Ground and Air Vibrations
Know the location of the blast Check the distance!!
North
Jones
Residence
690 Feet
Permit Area
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Ground and Air Vibrations
Know the charge weigh per delay Check the explosives per hole
Check for overlaps – time the blast out!!
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Diameter I
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Material Shoe
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Stemming
Blasting Mach.
Distance
,- Scale Distance
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100· 350· 700·
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150· 400· 900·
175· 425· 1000·
200· 450·
225· 475· Total
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Ground vibrations
Distance SD PPV < 301 50 1.25 301 – 5000 55 1.00 > 5000 65 0.75
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Airblast
2 Hz microphone 133 dB All seismographs manufactured today
have 2 Hz lower frequency response range.
No Scaled Distance counterpart.
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If seismograms are available -
Plot the data SD2 vs PPV
Plot the data SD3 vs dB
Does the data plot as a group or in a straight line?
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SD vs Ground Vibrations
0.01
0.10
1.00
10.00
10 100 1000
SCALED DISTANCE
PEAK
PAR
TICL
E VE
LOCI
TY
PPV PPV MAX
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SD vs Airblast
90
95100
105110
115
120125
130135
140
SCALED DISTANCE
AIRB
LAST
dB
AIRBLAST MAX airblast
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Flyrock Damage - 1995 - KY
* Children playing outside - Cost $1.5 million
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Flyrock Death – 1993 - TN
Passenger in a car on I-75
Blaster 5 months in jail 5 months house detention 1 year probation
Superintendent 3 months halfway house 5 month house detention
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Flyrock control items
Stemming
Powder Factor
Rock Type
Confinement
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Key blast log parameters
Blast location
Charge weight
Stemming
Rock type
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Blast Log Evaluation Program
All data obtained from the blast logs Cross tabulates data fields Plots the data for visual comparison Lumped or linear data are good Scattered data are bad Outlying data must be investigated further
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What does BLEP buy you??
Shows compliance with vibration limits Saves you the trouble of calculating by
hand Creates a permanent record of your
review Identifies outlying blasts relative to typical
blasting at the mine Allows statistical analysis of the data
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Break!
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Excel
BLEP operates as a spread sheet in Excel First, we will explore the use of Excel Launch Excel and discuss the menus and
components of the spreadsheet
Go to Tools/Customize, check the boxes: Show standard and Formatting toolbars on
two rows Always show full menus
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Data Entry
Numeric data Alpha numeric data Copy feature Numeric operators
+ Addition - Subtraction * Multiplication / Division ^ Exponential
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Data Entry Column A Distance: 450, 550, 650, 750,
900, 2000 Column B Charge Weight: 100, 100, 100,
100, 100, 100 Column C Addition: A + 10 Column D Subtraction: B – 10 Column E Multiplication: A * 2 Column F Division: B / 2 Column G Exponent: A ^ 2 Column H Scaled Distance: A / B ^.5 Column I PPV: H ^ -1.52 * 438
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Graphing
Save as Test 1 Graph columns A and B Graph columns C and D Graph Columns A and E Headers Axis editing Scale editing
Normal Log-log
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Data Entry/Graphing
Sheet 4 Example 1 in notebook Enter distance, charge weight and PPV Calculate scaled distance and worse-case
PPV Graph log-log SD vs PPV Add worse-case line Add trendline
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Timing
Save Test 1 Sheet 2 Illustrate 100 x 17 ms timing
Generate array Copy / Paste Special (values) Sort A-Z Bottom ms – top ms in adjacent field
Save
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Timing
Sheet 3 6 x 7 pattern, Zig-zag 42 ms up one side with 17 ms
down the row Overlaps?
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Break!
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Downloading BLEP Files
Create desktop folder called BLEP www.osmre.gov
Research and Technology Blasting Information
Copy all BLEP files to the desktop folder Open and reference BLEP-Instructions Open and discuss Field-Log
(DO NOT copy data into this spreadsheet!!)
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Sky Haven Example
Use field log to transpose log data Five records Review first two records and discuss the
data input required for each field as outlined in the instructions
Alpha, Numeric or Date? Numeric fields will be used in formulas or
plotted
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BLEP
Launch BLEP Save Template As SkyHaven.xls Data Entry ….. 5 records Discuss results
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Full Sample.xls
Discuss each graph Discuss notes Discuss graph interpretation
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Grace Example
Use Field Log Data entry Discuss findings Instructor add Measured Distance and
Timing to show red squares Discuss graph coupling for flyrock, ground
vibration and air blast
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Scaled Distance Sample
Emphasis importance of: Getting a Measured Distance Timing the blast
These will get the red square verification points that should over lay the blue circles
Discuss utility
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Old Hickory Exercise
Data entry Time each blast Enter Measured Distance based on Airblast
arrival time Discuss results
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Vibration Sample
Emphasis minimal data entry when vibration data is available
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Rinker Exercise Single blast monitoring Enter
Date, Time Charge Weight Distance on each waveform PPV, Frequency, Airblast
Illustrate directional effects Regression analysis with Trendline – Power
function Add equation Add R2
Modified scaled distance methodology
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Question??