Vertical loading experiments on rigid pad foundations at Bothkennar

The Paper describes tests on instrumented rigid square pads performed at the EPSRC soft clay test site at Bothkennar in Scotland. The aims were to investigate bearing capacity and load-displacement behaviour under short-term and long-term conditions. The instrumentation and loading schemes also allowed the soil's in situ stress–strain, consolidation and creep properties to be compared with those established in high quality laboratory tests. There was generally good agreement. The results emphasize that non-linearity has an important effect on the behaviour of spread foundations, even when they are subject to relatively light loads. KEYWORDS: bearing capacity; case history; clays; compressibility; footings/foundations; full-scale tests; stiffness. L'article presente les essais realises sur des surfaces carrees rigides et instrumentees installees sur le site experimental `argiles molles' du ESERC Bothkennar, Ecosse. Le but est d'etudier la charge admissible et le comportement chargementdeplacement a court e...

[1]  植下 協.  「土質・岩盤力学のための弾性解」, Poulos, H.G. and Davis, E. H. : "Elastic Solutions for Soil and Rock Mechanics, " John Wiley & Sons, Inc., 1974. , 1974 .

[2]  Michele Jamiolkowski,et al.  Design parameters from theory to practice , 1991 .

[3]  S. Leroueil,et al.  The behaviour of embankments on clay foundations , 1980 .

[4]  Richard J. Jardine,et al.  THE YIELDING OF BOTHKENNAR CLAY , 1992 .

[5]  L. R. Davison,et al.  One-dimensional consolidation testing of soft clay from Bothkennar , 1992 .

[6]  Akc Smith,et al.  AN INVESTIGATION OF BEARING CAPACITY AND SETTLEMENTS OF SOFT CLAY DEPOSITS AT SHELLHAVEN , 1993 .

[7]  Serge Leroueil,et al.  In situ and laboratory stress–strain relationships , 1988 .

[8]  H. G. Hopkins,et al.  Axially symmetric plastic deformations in soils , 1961, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[9]  Richard J. Jardine,et al.  Performance of vertical drains at Queenborough bypass , 1981 .

[10]  H. Poulos,et al.  Elastic solutions for soil and rock mechanics , 1973 .

[11]  P Hepton.  SHEAR WAVE VELOCITY MEASUREMENTS DURING PENETRATION TESTING. PENETRATION TESTING IN THE UK. PROCEEDINGS OF THE GEOTECHNOLOGY CONFERENCE ORGANIZED BY THE INSTITUTION OF CIVIL ENGINEERS AND HELD IN BIRMINGHAM ON 6-8 JULY 1988 , 1989 .

[12]  Barry Lehane,et al.  Bearing Capacity and Load-displacement Behavior of Rigid Pads on Soft, Sensitive, Clay , 1993 .

[13]  J. Burland.  Ninth Laurits Bjerrum Memorial Lecture: "Small is beautiful"—the stiffness of soils at small strains , 1989 .

[14]  Tom Lunne,et al.  Role of CPT in North Sea Foundation Engineering , 1981 .

[15]  A. Fourie,et al.  Studies of the influence of non-linear stress-strain characteristics in soil-structure interaction , 1986 .

[16]  Harry G. Poulos,et al.  RATE OF SETTLEMENT UNDER TWO- AND THREE- DIMENSIONAL CONDITIONS , 1972 .

[17]  Barry Lehane,et al.  THE BEHAVIOUR OF A DISPLACEMENT PILE IN BOTHKENNAR CLAY , 1992 .

[18]  S. Leroueil,et al.  Yielding of Mexico City clay and other natural clays , 1992 .

[19]  L. Bjerrum,et al.  Problems of soil mechanics and construction on soft clays and structurally unstable soils (collapsible, expansive and others) , 1973 .

[20]  J. H. Atkinson,et al.  MECHANICAL PROPERTIES OF RECONSTITUTED BOTHKENNAR SOIL , 1992 .

[21]  G. H. Watson,et al.  Performance of preloaded and stage-loaded structures on soft soils in Trinidad , 1984 .

[22]  D. M. Wood.  Yielding in soft clay at Bäckebol, Sweden , 1980 .

[23]  D. Shields,et al.  Determination of the Modulus of Deformation of a Sensitive Clay using Laboratory and In-Situ Tests , 1975 .

[24]  P Gildea.  INSTRUMENTED FOOTING LOAD TESTS IN SOFT SENSITIVE BOTHKENNAR CLAY , 1919 .

[25]  P Hepton,et al.  Shear wave velocity measurements during penetration testing , 1989 .