STABILITY ANALYSIS WITH THE EFFECTIVE STRESS METHOD FOR EMBANKMENTS CONSTRUCTED ON AN ALLUVIAL MARINE CLAY

Five embankments were rapidly constructed on an alluvial marine clay under a very low factor of safety. One embankment failed and two others must have been on the verge of failure. A stability analysis with the total stress method for each embankment was reported by Hanzawa et al. (1980) and showed quite a good agreement with the field behaviour of embankments when the undrained strength of the clay was elevated from the modified Bjerrum's method in considerations of the effects of anisotropy and strain rate. In this paper, a stability analysis with the effective stress method as well as comparison of measured and predicted excess pore water pressure is presented. Excess pore water pressure was predicted using pore pressure coefficient, a-value in consideration of the effect of strain rate on pore pressure behaviour and the predicted values showed good agreement with the measured values in spite of the fact that piezometers were installed in considerably different types of clay. Strength parameters of the clay are discussed in detail in the light of fundamental properties of normally consolidated aged clay and a procedure for determining the parameters for short term stability analysis is proposed. Factors of safety obtained by the effective stress method were 20 per cent to 30 per cent higher than the reasonable values evaluated from the field behaviour of each embankment and strongly suggested the necessity to take consideration of the effects of anisotropy and strain rate in determining strength parameters for practical stability problems. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00380806
• Corporate Authors:

  Japanese Society of Soil Mech & Foundation Engrs

  Tokyo,   Japan 
• Authors:
  • Hanzawa, H
  • Kishida, T
  • Matsuda, E
• Publication Date: 1982-9

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 32-46
• Serial:
  • SOILS AND FOUNDATIONS
  • Volume: 22
  • Issue Number: 3
  • Publisher: JAPANESE GEOTECHNICAL SOCIETY
  • ISSN: 0038-0806

Subject/Index Terms

• TRT Terms: Alluvium; Anisotropy (Physics); Behavior; Clay; Earthwork; Embankments; Marine soils; Mathematical analysis; Methodology; Piezometers; Pore water pressures; Safety factors; Stability (Mechanics); Stability analysis; Strain (Mechanics); Strength of materials; Stresses
• Uncontrolled Terms: Strain rate
• Old TRIS Terms: Anisotropy
• ITRD Terms: 6471: Analysis (math); 9001: Behaviour; 4177: Clay; 3653: Earthworks; 2801: Embankment; 9102: Method; 5762: Pore water pressure; 5930: Stability; 5544: Strength (mater); 5575: Stress (in material)
• Subject Areas: Geotechnology; Highways; Safety and Human Factors; I51: Earthworks and Soil Drainage;

Filing Info

• Accession Number: 00371473
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Apr 29 1983 12:00AM