Pore water pressure fluctuation

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Large deformations that accompany longwall mining result in complex spatial and temporal distributions of changes in undrained pore fluid pressures around the advancing face. These seemingly anomalous changes are recorded in the rapid water level response of undermined and adjacent wells, and may be explained in the short-term as undrained poroelastic effect. A three-dimensional finite element model is applied to define anticipated pore fluid response both around the advancing mine face, at depth, and in the near surface region. The results are carefully verified against the response recorded at three well instrumented longwall sites. Pore pressure changes are indexed directly to volumetric strains defining zones of significant depressurisation in the caving zone and in zones of extension adjacent to the subsidence trough on the ground surface. Over-pressurisation in the abutment region, at panel depth, and in the surface compressive zone immediately inside the angle-of-draw. These results are confirmed with available, short-term water response data, defining the strongly heterogeneous spatial response and the significance of well depth on anticipated water level response.

Original languageEnglish (US)
Pages (from-to)237-242
Number of pages6
JournalCoal International Mining and Quarry World
Issue number6
StatePublished - Nov 1 2000

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering


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