2021

Rock Mass Data Analyser

The Rock Mass Data Analyser (RMDA) application allows a user the ability to input various types of geotechnical data into mXrap, creating a geotechnical database of borehole and mapping data, which may be easily visualised and analysed in 3D, on charts and in stereonets. Thus far, the application has been developed to allow for the visualisation and assessment of: Rock mass quality data e.g. RQD, RMR, Q, Q’, GSI etc. Structural data i.e. joint orientations and joint conditions from scanline mapping and logging data Laboratory test results e.g. UCS, TCS, and BTS Once data has been imported there are multiple filter options available for borehole IDs, lithologies, data sources, joint sets and rock strength test types. Pre-set legends for all geotechnical data is also provided within the app as well as the ability to select and filter data based on 3D locations.                                                               Q values plotted along boreholes Histograms and CDF curves of rock mass quality data are also available for the various lithologies and boreholes in the database. These lithologies may be combined or plotted separately. The ability to select data based on 3D location also provides the user the opportunity to create histograms for a specific geotechnical domain or area of interest.    Histogram and CDF curve of Q values for a combination of lithologies  Histogram and CDF curves of Q values for two lithologies plotted separately Both scanline mapping data and borehole structural logs can be imported and viewed in 3D and on stereonets. Once structural data is imported, the user has the option to assign discontinuity sets on stereonets. As sets are assigned or as filters are applied, real time updates to discontinuity set statistics are also provided. Structures plotted along boreholes based on discontinuity set  Poles plotted on stereonet based on discontinuity set  For intact strength laboratory test results, along with visualisation of the test result locations along boreholes, Hoek-Brown failure envelopes can also be produced for specific lithologies, a group of data or for specific boreholes.                                                         Hoek-Brown curves based on UCS, TCS and BTS test results The RMDA is also integrated with mXrap’s Discrete Fracture Network (DFN) generation app and our data collection web app (which allows for efficient scanline mapping with the use of a tablet). Currents plans for the RMDA include the development of a window mapping section and integration with mXrap’s seismic suite, allowing a user to view their rock mass quality and structural data along with their seismic events. The RMDA will also act a feeder app into the stope reconciliation and geotechnical block model applications, which are currently under development. For more information or if you would like to try the RMDA application, please contact our support email.

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Updates to large event analysis

The Large Event Analysis app has receieved a number of upgrades recently. These upgrades focus on analysing seismicity in the immediate time before/after a large event. A new window, called ‘plane based analysis’, allows the user to investigate the source parameters around the location of an event before/after it occurred. The analysis conducted is the same as that of the planes in grid based analysis, however the time period is centred around the event time. The planes locations can be copied from the event, so they are centred around the event. The size of the planes can be copied from the event source radius and the plane orientations from the focal planes from the event’s moment tensor solution.

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Updates to the Grid Based Analysis app

There are a number of updates to the Grid Based Analysis app. The first is the ability to use multiple planes for analysis instead of just a single plane. You can also now choose up to two dynamically generated planes, instead of just the saved planes. There is a new chart called ‘grid results distribution’ which gives both a histogram and cumulative distribution of the grid results so you can dig further into your results. The last is a streamlining of the ‘advanced’ features. This makes it easier to compare different parameters in both the long and short term, using the grid and isosurfaces. Users can set a longer term and shorter term time period to identify areas of interest where seismicity in the short term differs from the longer term ‘norm’ for the mine. Using the transparency function on the grid can help to highlight these areas of interest. If you can’t see these options in your mXrap, you may need an upgrade to your root folder – contact us at our support email address.

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