CONSOLIDATION UNDER VARIABLE LOAD SETTLEMENT AND PORE PRESSURE. THEORETICAL AND EXPERIMENTAL STUDY

CONSOLIDATION SOUS CHARGE VARIABLE, TASSEMENTS ET PRESSION INTERSTITIELLE, ETUDE THEORIQUE ET EXPERIMENTALE

The construction of high embankments on compressible soil lasts several months or even several years. To prevent failure, it is necessary to establish a load application programme for the subgrade. In-situ soil layers are subjected to a total variable pressure as a function of time. Stability studies and settlement forecasts are conducted based on the assumption of instantaneous loading, which does not take into account the real phenomena occurring during construction. The comparison of in-situ measurements in the forecasts is practically impossible. In order to obtain data on the evolution in pore pressure and settlement during loading time, it is necessary to study the consolidation under total variable load as a function of time. The first part of the article outlines the schiffman theory and the terzaghi approximate method. The second part describes the experimental study carried out at the angers laboratory on compressible soils. Full details are given of the instrumentation and main results obtained as regards evolution in settlement and pore pressure. Approximate formulae are proposed for solving basic problems. Results show that the terzaghi method gives an acceptable settlement value. The schiffman theory is verified during loading time as regards evaluation of the degree of consolidation. Attention is drawn to the fact that the last stages of loading can increase pore pressure greatly thus threatening the stability of the embankment. /TRRL/

• Corporate Authors:

  Societe de Diffusion de Tech du Bat et de Trav Pub

  9 rue la Perouse
  Paris 16e,   France 
• Authors:
  • Peignaud, M
• Publication Date: 1972-1

Language

• French

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 117-36
• Serial:
  • Annales de l'Institut Tech du Batiment Travaux Pub
  • Issue Number: 289
  • Publisher: Societe de Diffusion de Tech du Bat et de Trav Pub

Subject/Index Terms

• TRT Terms: Compressibility; Consolidations; Embankments; Equipment; Forecasting; Formulas; Foundations; Ground settlement; Laboratory tests; Loads; Mathematical models; Measurement; Pore pressure; Pore water pressures; Slope stability; Soil mechanics; Soil stabilization; Soils; Stability (Mechanics); Tests; Theory; Time
• Uncontrolled Terms: Loading
• Geographic Terms: France
• Old TRIS Terms: Embankment stability
• ITRD Terms: 6155: Apparatus (measuring); 4177: Clay; 8525: Conference; 5791: Consolidation (soil); 2937: Drainage; 2801: Embankment; 3674: Equipment; 3377: Foundation; 8036: France; 6237: Laboratory (not an organization); 5567: Load; 6473: Mathematical model; 6168: Oedometer; 5762: Pore water pressure; 6251: Sample (mater); 5792: Settlement; 4156: Soil; 5755: Soil mechanics; 6255: Test; 9078: Theory; 9086: Variability
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00097835
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Files: ITRD, TRIS
• Created Date: Sep 30 1975 12:00AM