Some experimental studies concerning the contact stresses beneath interfering rigid strip foundations resting on a granular stratum

104A between the boundary displacements and internal embankment strains, with and without inclusions, for the two construction sequences used. The crucial importance of the construction sequence on the strain behaviours of the sand-alone embankments is identified and the influence of this on the effectiveness of the inclusions is highlighted. The applicability of the finite element method of analysis to the prediction of the behaviour of such soil-inclusion systems is suggested. Auth. 843218 Cabril Dam - control of the grouting effectiveness by geophysical seismic tests Rodrigues, L F; Oliveira, R; Correia de Sousa, A Proc 5th Congress of the International Society for Rock

Mechanics, Melbourne, 10-15 April 1983 V1, PAl-A4. Publ Rotterdam: ,4. ,4. Balkema, 1983 To evaluate the effectiveness of grout treatment for the reinforcement of the Cabril Dam foundation, Portugal, the longitudinal wave velocity was measured at eight zones of the granitic rock mass before and after grouting work. The results of the crosshole and uphole seismic tests showed an increase in the average longitudinal wave velocity from 2 to 20%. Good agreement between this increase and the decrease in permeability as well as in grout take, was confirmed. Foundations

See also: 843043, 843056, 843097, 843294, 843302, 843334, 843336 843219 Stability of installation of marine caisson anchors in day Burgess, I W; Hird, C C Can Geotech J V20, N3, Aug 1983, P385-393 A simple stability analysis is presented for caissons of general prismatic cross section and for circular cylinders, inserted into uniform clay by means of gravity force or internal suction. The results of model tests carried out at two different scales support this theory. As a means of inserting caisson anchors, suction appears to be useful but practical use may cause difficulties. 84322O Some experimental studies concerning the contact stresses beneath interfering rigid strip foundations resting on a granular stratum Selvadurai, A P S; Rabbaa, S A A Can Geotech J V20, N3, Aug 1983, P406-415 Presents an experimental study of the contact stress distribution beneath two interfering rigid strip foundations resting in frictionless contact with a layer of dense sand underlain by a smooth rigid base. It is found that the interference between the two foundations has a significant influence on the contact stress distribution. In the absence of interference, the contact stress distribution beneath a single foundation exhibits a symmetrical shape. As the spacing between the foundations diminishes the contact stress distribution exhibits an asymmetrical shape. 843221 Settlement of a strip footing on a confined clay layer. Technical note Taylor, B B; Matyas, E L Can Geotech J V20, N3, Aug 1983, P535-542 A procedure is described which allows an estimation of consolidation or immediate settlements of a uniformly loaded, flexible strip footing founded below the ground surface. The soil above the footing is sand and below, clay extending to a finite depth. The procedure is based on a solution of Kelvin's equations for a line load acting within an infinite solid. Charts are

presented which permit an estimate of settlement for various compression moduli, Poisson's ratios and clay thicknesses. The method predicts consolidation settlements generally higher than those predicted from Boussinesq theory. 843222 Underground building reclaims a landfill

Civ Engng, N Y V54, N1, Jan 1984, P42-44 A building for Multnomah County, Oregon, USA has been built largely below ground by excavating 9m into landfill allowing foundation in firm soil. More than 600 precast concrete components (both prestressed and conventionally reinforced) were used. 843223 Case history of a foundation problem in soft chalk Burland, J B; Hancock, R J; May, J

Geoteclmique V33, N4, Dec 1983, P385-395 Difficult ground conditions caused foundation construction for a 4 storey building to be suspended in Salisbury, Hampshire, UK. Excavation for a basement within a coffer-dam led to a piping failure of the chalk which was found to be very soft, consisting of small angular pieces of chalk in a silt-like putty chalk matrix. Supplementary site investigations - cone penetrometer tests and large scale in situ loading tests - were carried out to assess the load-settlement characteristics of the foundations. The pad and raft foundations adopted were shown to be satisfactory. 843224 Calculation of elasticities and settlements for long periods of time and high strains from seismic measurements Abbiss, C P

Geoteclmique V33, N4, Dec 1983, P397-405 Proposes a method whereby measurements made over short times and at low strains by means of shear waves are used to calculate settlements over much longer times and at higher strains. The time dependence is described by a mathematical model of the generalized viscoelastic solid where the characteristics are shown by the damping factor as a function of time. Settlement curves are compared with experimental data for loaded pads on boulder clay. Materials to which the method can be applied at present are stiff clays and weak rocks. 843225 Offshore foundation instrumentation Semple, R M

Ground Engng VI6, NS, Nov 1983, P6-7 Report of a meeting of the British Geotechnical Society held on 27 April 1983. 843226 Fondedile Foundations comes of age. Twenty-one years of growth from small roots

Ground Engng V16, NS, Nov 1983, P23-28 Reviews the activities of Fondedile Foundations Ltd and the development of the root pile. The root pile has been used extensively, especially for underpinning. 843227 Ultimate bearing capacity of friction piles calculated from load tests on pilot piles Lizzi, F

Ground Engng V16, N5, Nov 1983, P41-45 For cast-in-situ friction piles, load tests carried to failure on smaller diameter piles (pilot piles) can be used for assessing the corresponding failure values of larger diameter piles of the same