mXrap Instrumentation Apps

Prism Monitoring

Status: Beta

Principal Authors: Kyle Woodward

Contributing Authors: Paul Harris

Citation:
Woodward, K.R. (2016) mXrap software app, Prism Monitoring. Perth, Western Australia: The Australian Centre for Geomechanics, University of Western Australia. http://www.mXrap.com

Description:
The Prism Monitoring app provides the tools to import and evaluate prism data which is routine used to monitor ground movements, for example, slopes in open pits or subsidence zones associated with caving. Prism data is assessed as displacement and rates in 3D, 2D, and X, Y and Z directions. Displacement and rate data is plotted in 3D as a vector and interpolated values on survey surfaces (Figure 1), charted over time, and summarised in tables (Figure 2). Data from period of interest can be selected for individual, multiple, or predefined zones of prisms. Additional analysis options include piecewise linear fitting to assess rates of deformation (Figure 3), persistent quality tags for excluding erroneous data, and plotting of rockfall data with respect to surveys and prism results.


Figure 1: 3D plot of displacement vectors with values interpolated on surveys


Figure 2: Table results for combined and indivdual prism


Figure 3: Piecewise linear fitting of 3D displacement rates

Extensometers

Status: Beta

Principal Author: Kyle Woodward

Contributing Author: Paul Harris

Citation: Woodward, K.R. (2017) mXrap software app, Extensometers. Perth, Western Australia: The Australian Centre for Geomechanics, University of Western Australia. http://www.mXrap.com

Description:

The app provides the tools import and evaluate various formats of extensometer data. Data is assessed over the life of the instrument and for a period of interest. Displacement is expressed as a cumulative vaule over the instrument length and per node values. Instruments are plotted in 3D with markers displaying displacement measurement along with nearby seismic events and blasts. Cumulative and Per node displacement values are charted over time and summarised in tables. Figure 1 provides an example of these plots.


Figure 1: 3D plot of cumulative and per node displacement along with blasts and seismic events for an analysis period (top). These displacement values are charted for the life of the instrument (middle) and summarised for the period of interest (bottom)

In-situ Stress Monitoring

Status: Exploratory

Principal Authors: Kyle Woodward

Contributing Authors: Paul Harris

Citation:
Woodward, KR (2017) mXrap software app, In-situ stress monitoring . Perth, Western Australia: The Australian Centre for Geomechanics, University of Western Australia. http://www.mXrap.com

Description:
Continual monitoring of in-situ stress are done by installing stress measurement devices like the CSIRO stress cell, and monitoring the measured changes over time. This app receives the strain meausurement recorded by the stress measurement device and invert for the in-situ stress state. This allows for the analysis of changes in stress magnitude and orientation over time