PORE PRESSURE IN CLAY AS A MEANS OF FORECASTING SETTLEMENT

MAETNING AV LERANS PORTRYCK GER UPPGIFT OM SAETTNINGAR

Water infiltration into rock tunnels, drainage systems and a decreased rate of ground infiltration due to impervious ground surfaces contribute to a lowering of groundwater tables in urban areas. In clay this causes a decreasing pore pressure and subsequently settlements that may have harmful effects. In this article measuring results are presented and analysed for a number of cases of lowered groundwater levels. A comparison is made between the calculated and the actual changes of pore pressure. Based on this a prediction is made of the rate of settlement and its final magnitude in clay layers with thicknesses varying from 10 to 20 metres. Three cases of groundwater lowering caused by rock tunnels and/or drainage systems are studied. According to these results harmful settlements in clay layers can be expected for very long periods, 50 to 100 years, after the ground water lowering has occurred. /TRRL/

• Corporate Authors:

  AB Buggmastarens Forlag

  Sveavagan 17
  5tr Stockholm,   Sweden 
• Authors:
  • Torstensson, B A
• Publication Date: 1975

Language

• Swedish

Media Info

• Features: Figures; References;
• Pagination: p. 15-19
• Serial:
  • Byggmastaren
  • Volume: 55
  • Issue Number: 8
  • Publisher: AM Myggmastarens

Subject/Index Terms

• TRT Terms: Clay; Drainage structures; Drawdown (Hydraulics); Forecasting; Ground settlement; Groundwater; Infiltration; Lowering; Measurement; Pore pressure; Pore water pressures; Rocks; Tunnels; Urban areas; Water table
• Uncontrolled Terms: Ground
• Old TRIS Terms: Drainage systems
• ITRD Terms: 4177: Clay; 4383: Ground water; 4395: Lowering (water table); 6136: Measurement; 5762: Pore water pressure; 5792: Settlement; 4394: Water table
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00137555
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, TRIS
• Created Date: Oct 26 1976 12:00AM