SCT Operations (Strata Control Technology)
  • Published Papers 2020 to now
  • Yvette Heritage

Welcome to SCT's own publications library which contains a collection of recent publications and other resources with reliable research about our technology. 

  • Definitions of Measured Hydraulic Conductivity Zones above a Longwall Panel

    This paper presents the results of a field investigation to determine zones of hydraulic conductivity above an extracted longwall panel at United Colliery in the Hunter Valley of NSW. The hydraulic conductivity zones were determined from targeted boreholes drilled into the subsided strata above the goaf of Longwall 10, an isolated panel with a supercritical width panel geometry. Five boreholes defined the edge of caving and characterised the hydraulic conductivity within and above the caved zone. The deepest hole in the centre of the goaf was drilled to 30m above the extracted seam, providing hydraulic conductivity data through most of the subsided overburden strata. Definitions-of-Measured-Hydraulic-Conductivity-Zones-above-a-Longwall-Panel-YHeritage-MSTS-2022.pdf901 KB
  • Measurement of the caved zone above a longwall panel United Colliery

    This paper presents the results of a targeted goaf borehole program to define the edge of the Longwall 10 caved zone at United Colliery, Hunter Valley NSW. Longwall 10 is an isolated panel with a supercritical panel geometry. Three of the five boreholes defined the edge of caving, while two boreholes characterised the centre of the goaf. The location of the caved zone was depicted from a combination of total water loss during drilling that coincided with a subvertical fracture at the location of total water loss. The boreholes showed the caving angle from the pillar ribs to be 21 degrees on the up dip side and 19 degrees on the down dip side of the panel. An additional borehole drilled 10 metres (m) towards the goaf centre on the up dip side showed a caving angle increase to 25 degrees from the adjacent borehole, indicating the arc shape of the caved zone. The caving angle coincided with a high strain fracture zone and connectivity to the goaf. This caving angle information can inform assessments for hydraulic/gas connectivity and geotechnical engineering applications such as multi-seam overmining or opencut/underground interaction. (Note that the caving angle is not the same as the abutment angle, which the latter is a calculated angle
    based on pillar load.)
    Y-Heritage_Measurement-of-the-caved-zone-above-a-longwall-panel-United-Colliery.pdf1.3 MB
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