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Burden/spacing comparison

Proper confinement of a blast is essential to minimize adverse effects. For instance, if a blast is heavily confined, excessive ground vibrations may result. On the other hand, if a blast is under confined, excessive airblast or flyrock may result. Burden and spacing influence confinement.

Lower left portion of the Spacing graph showing the one plot.The Burden / Spacing Comparison graph displayed on the Spacing tab identifies an optimum zone for confinement. The two reference lines indicate the "safe" range. Data points above the S=2B reference line represent blasts that were under-confined. Blasts below the S=B reference line represent blasts that were heavily confined.

Take a look at the graph generated from our ongoing example— SkyHavenCompleted.xls. If you did not create this file, open this version now. Then, click the Spacing tab along the bottom edge of the worksheet.

Rule marking the begining of an activity.

Using the SkyHavenCompleted.xls, answer the question below. Note: None of the quizzes in this course are recorded in any way.

Quiz on the Burden/Stemming chart.

Contents

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+ Introduction
About BLEP
Why BLEP can help
About the teacher
Prerequisites for BLEP
Objectives
+ Using Excel
+ Basic operations
Starting Excel
Touring Excel
Entering data
Addition
Subtraction
Multiplication
Division
Using exponents
+ Calculating values
Scaled distance
Calculating PPV
+ Building charts
Creating a chart
Modifying a chart
+ Trendlines
Build chart
Add trendline
Evaluation
+ Verifying timing
Detonation matrix
Detonation delay
+ Using BLEP
Downloading BLEP
BLEP contents
Blast logs to field log
Field log to BLEP
+ BLEP graphs
Burden/spacing
Stemming adequacy
CW per hole
CW per delay
Distance comparison
Powder factor
SD compliance
PPV compliance
SD vs. PPV
BLC compliance
Airblast analysis
Case study
+ Specialized graphs
Data input
Vibration graphs
Course help
References
Feedback

Ken Eltschlager
OSM Appalachian Region
3 Parkway Center
Pittsburgh, PA
Tel: 412-937-2169
keltschl@osmre.gov