Use this URL to cite or link to this record in EThOS:
Title: The strength and deformation characteristics of a soft alluvial clay under full scale loading conditions
Author: Pugh, R. S.
ISNI:       0000 0001 3502 721X
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1978
Availability of Full Text:
Access from EThOS:
Access from Institution:
Extensive investigations into the st.'ength and,deformation characteristics of a soft alluvial clay have been made on a site adj(lcent to the River Thames at Stanford~le-hope in Essex. The field investigations with which this work is primarily concerned, comprised both large diameter (from a test pit) and conventional piston sampling for laboratory testing purpo!:es, vane shear and penncability testing and construction of five instrumented trial E'mbankments. The historical development of the Thtlmes Tidal Defences and the geotechnical problems associated with their construction and rr.aintenance are discussed. p, geotechnical appraisal. of the test site is presented together \·,ith a critical discussion of the laboratory test data and its relev~nce to the desio..,n of embankment foundations • In view of cun'ent uncertainties regarding the use in design of shear strengths measured with the field vane apparatus a detailed study of this problem is made. Horizontal and vertical (small) vane tests were performed from, ilnd adjacent to the test pit as part of a study of undrained strength anisotropy. A ne~: (large) power driven vane WaS designed and used to investigate the effect of strain rate on the in-situ shear strength. Construction, monitoring and instrumentation of the trial embankments are critically discussed and a new Qethod of monitoring displacements during construction and failure is presented. (i i ) The da.ta from the foundati on tri a ls pravi de a detailed pi cture of the alluvial clay's behavioul~ under construction, failure and long-tenn . loading conditions. The suctess achieved in the prediction of the various modes of behavioui~, using Doth laboratory and small scale field test data, is critically assessed. Particular attention is paid to the determination of the field shear strength, in terms of total and effective stress, using limit equilibrium analyses and to the prediction of pore pressures' and undrained displacements using finite element analyses.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available