Bearing capacity of three closely-spaced footings on sand

194A The BATLAB computer program, developed for assessing the behaviour of piles under impact by studying the propagation of waves along the pile, is described. 845268 Bearing capacity of a micropile in marl (In French) Bustamante, M; Gianeselli, L; Ledoux, J L; Seigle, B; Klos, J Bull Liaison Lab Ponts Chaussees N128, Nov-Dec 1983, P47-54 Tests were carried out on a full-scale micropile under vertical static load injected into loose alluvia moderately compacted at the surface, underlain by stiff marl. The micropile was fitted with a movable strain gauge which allowed lateral friction and point resistance to be determined. 845269 Influence of vegetation on the swelling and shrinking of clays. Discussion Geotechnique V34, N2, June 1984, P139-172 Extensive discussion of the paper previously published in Geotechnique. 845270 Bearing capacity of three closely-spaced footings on sand Graham, J; Raymond, G P; Suppiah, A Geotechm'que 1/34, N2, June 1984, P173-181 Model tests on sands have shown that large increases in bearing capacity are associated with closely-spaced footings. The capacity increases further when the loads on neighbouring footings are below failure. The distribution of loads between neighbouring footings changes little as the loading increases towards failure. Differences in footing roughness have little effect on capacities or efficiencies. Stress-characteristic solutions agree qualitatively with the model results but underestimate the extent of regions in which interference can be observed. 845271 Performance of preloaded and stage-loaded structures on soft soils in Trinidad Watson, G H; Crooks, J H A; Williams, R S; Yam, C C Geotechnique V34, N2, June 1984, P239-257 Both preloading and stage loading were used in the founding of a cooling tower and several water tanks on recent sediments at an industrial site in Trinidad. Results from consolidated drained triaxial tests indicate a yield envelope for the soils and this was used to interpret the behaviour of the sediments below a preload fill and stage-loaded tanks. The effective stress path yield envelope was also used to explain a decrease in pore water dissipation rate three months after completion of the preload fill. 845272 Deep foundations for the British Library Ground Engng V]7, N3, April 1984, P20-26 Foundation works for the first phase of the new British Library in London, UK, have included around the perimeter London's deepest secant piled wall extending to a maximum depth of 30m and, to carry the structural loads, bored cast-in-situ piles of 1.8m shaft diameter with under-reams of up to 4.2m diameter founded in Woolwich and Reading sand. The extent of the foundation areas, the presence of underground railway tunnels and the proximity of a number of large buildings have been factors affecting the design and construction of the library foundations.

845273 Skin friction in model pile groups Lake, G C Highw Transp V30, NIO, Oct 1983, P18-22 Model tests were carried out to study the effects of spacing and sand depth on the frictional capacity of pile groups in sand, and the development of friction load on individual piles within the group while passing through a sand stratum. It was concluded that while both the skin frictional capacities for a group and for a single pile increase linearly with depth, the increase in gradient for the single pile is slightly greater. Therefore the group efficiency when compared with an equivalent number of isolated piles appears to decrease with depth. 845274 Foyle Bridge: construction of foundations and viaduct Quinn, W N lnst Civ Engr Proc V76, May 1984, P387-409 The Foyle Bridge, Londonderry, UK, is founded on metamorphic rock of varying quality. Over most of the site the rock is close to existing ground level so with the exception of pier 9, which is piled, all the foundations are on a reinforced concrete base slab typically 2m thick. The main piers, below low water mark, required cofferdams for their construction consisting of embankments of quarry face rubble with a cohesionless granular material lining on the inner face. 845275 Prestressed precast piling at Drax Power Station and the use of pulverized fuel ash replacement in concrete Woolley, G R; Gains, J C Inst Civ Engr Proc V76, May 1984, P473-493 To complete the construction of Drax Power Station, North Yorkshire, UK, 20,000 prestressed preeast piles with an average length of 20m were driven in clays, clayey silts and transported Bunter sand. The use of25% pulverised fuel ash cement replacement in the prccast piles is a novel, if not unique, constructional use of this material. 845276 Photoelastic analysis of laterally loaded rigid piles. Technical note Richter, J A; Demars, K R; Richards, R J Geotech Engng Div ASCE Iil10, NGT4, April 1984, P548551 A physical model of a single, rigid, finite pile loaded laterally in a homogeneous elastic continuum was used to investigate the influence of slip and no-slip interfaciai boundary conditions. A photoelastic analysis employing stress freezing techniques was used to examine the three dimensional stresses created in the surrounding medium. Results indicate that a significant portion (about 40%) of the lateral load is transferred to the surrounding medium by horizontal shear stresses along the sides of the pile when there is adhesion. 845277 Design of beds and foundations for rural buildings framed with three-hinge mill bents Zhukov, N V; Mirzabekyan, B Y; Kazakova, O V; Kashkarov, P N Soil Mech Found Engng V19, N6, Nov-Dec 1982, P248-252 Colunan foundations with flat roughened lower surfaces have widespread use in rural buildings. This paper compares some common methods for computing bearing capacity with experimental data in order to select the most appropriate methods for the design of these foundations.