THE REMOULDED UNDRAINED SHEAR STRENGTH OF COHESIVE SOILS AND ITS INFLUENCE ON THE STABILITY OF EMBANKMENT FILL

This paper investigates some aspects of the use of cohesive materials as embankment fill. The restrictions imposed on the acceptable strength of fill by trafficability requirements of the plant employed during construction are examined. Field observations show that the depth of rut caused by trafficking plant can be related to the remoulded undrained shear strength of the soil. Equivalent strengths can therefore be obtained for the observed practical limits of plant operation. Tyre pressures and vehicle size are found to influence these limits. From a study of the remoulded undrained shear strength behaviour of cohesive soils it is shown that there is a general relationship with moisture content for different soils. The principal influence on this behaviour is found to be that of liquid limit whilst the plastic limit is shown to be an inaccurate guide. A relationship is found to exist, at any remoulded undrained shear strength, between the liquid limit and the moisture content required to produce this strength. Universal limits in terms of a multiplicand of plastic limit are found to be inappropriate. A direct undrained shear strength criterion is advocated as it relates to the functional limitations of plant and the immediate stability of embankments. It is thus easily adaptable to the conditions of usage, and has the benefit of being directly related to liquid limit which can therefore be used as an indirect control parameter. (a) (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 87-94

Subject/Index Terms

Filing Info

  • Accession Number: 00311801
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-0069-3
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Jul 22 1980 12:00AM