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UXB-Probability Calculator

Measure your unexploded bomb risk

A tool is provided to quantify the risk of detonating an unexploded bomb (UXB) based on the user specifying the estimated number of UXBs (normally derived from a desk study), expected bomb size (weight in kg), an area of interest (ha) and number of intrusive sampling points for site investigation applications, or grid size in metres for piling solutions. The user can decide whether to include a 2m zone of influence (recommended) or not. Based on these inputs the probability of detonation is automatically provided on the top slider bar.

2008 by Zetica Ltd. All rights reserved.

This applet requires Java Runtime v1.6.0.02 (automatically installed if required).  Following a version upgrade you may need to restart your browser to view this applet correctly.

Instructions for use

A. Random sampling option

This option refers to measuring the impact of arbitrarily spaced boreholes, CPT or DP locations.
a) Select suspected bomb size from drop down list
b) Select estimated number of unexploded bombs
c) Select number of boreholes, CPT or DP locations
d) Select checkbox to include a 2m zone of influence for each intrusive point
e) Use slider bar to select area of interest to nearest 0.1ha

The Probability of detonation for the selected combination of variables will be automatically updated on the top slider.

B. Grid sampling option

This option refers to measuring the impact of regularly spaced pile locations, boreholes etc.
a) Select suspected bomb size from drop down list
b) Select estimated number of unexploded bombs per ha
c) Select checkbox to include a 2m zone of influence for each intrusive point
d) Use slider bar to select pile spacing to nearest 0.1m

The Probability of detonation for the selected combination of variables will be automatically updated on the top slider.


DISCLAIMER
This UXB-PC applet is based on an analytic solution developed by Zetica Ltd to calculate the probability of detonation of a UXB for site activities including drilling and piling. The assumptions underlying the calculation are discussed in the following reference: 'Bang on target: a statistical basis for assessing the risk of unexploded bombs during site investigations and piling. Ground engineering, May 2006' the results should not be taken as a substitute for a formal risk assessment. Zetica Ltd do not accept any liability whatsoever in respect of any claim, proceeding, loss or damage arising from the use of the UXB-PC applet.

 

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