Report: APP CMHS Project 1

CSIRO advises that the information contained in this comprises general statements based on scientific research. The reader is advised and needs to be aware that such information may be incomplete or unable to be used in any specific situation. No reliance or actions must therefore be made on that information without seeking prior expert professional, scientific and technical advice. To the extent permitted by law, CSIRO (including its employees and consultants) excludes all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using this publication (in part or in whole) and any information or material contained in it.

3.5.2. Roof Fall Control

This project was undertaken in collaboration with CSIRO of Australia (Tomita, 2007). The system includes roof geo-structure logging equipment, monitoring and evaluation hardware and software. The roof geo-structure logging equipment is to measure and record the mechanical data during roof bolt holes (Measurement While Drilling or MWD) and consists of a bolting unit, a data logger and analysis software, as shown in Figure 60.

Figure 60 Measurement While Drilling system

The monitoring and evaluation hardware is composed of acceleration sensors, extensometers, rock displacement sensors, stressmeters and a datalogger. The flowchart of the data acquisition and analysis is shown in Figure 61.

Figure 61 Flowchart of data acquisition and analysis

The output of the system is a set of probabilities of a roof fall happening within various period of time. The system was tested in Kushiro coal mine in Japan and Ulan mine in Australia (Figure 62 shows the test schematics at Ulan mine) and test results were encouraging. Figure 63 shows the 3D geo-structures of roof rock at Kushiro coal mine.

Figure 62 Roof monitoring schematic at Ulan

Figure 63 3D representation of rock mass

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