Foundation design and analysis aspects of piled offshore structures in soft soils in Sarawak and Sabah waters

245A 866239 Mudmat design considerations of offshore jacket structures on soft clay Boon, P J: Tan, C G: Tan, C K

Pro¢ 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Alalayffa, !1-15 Afarch 1985 V1. PI 49-54. Puhl

elastic solution. The tv.o solutions are used to derive expressions for the effecti,,e radial stress after consolidation and to calculate side resistance of a pile in clay,

Dams and embankments

Kuala Lumper. Organising Committee, 1986 Mudmats are used to provide temporary support for offshore jacket structures on seabed soils before permanent pile foundations are installed. A rational approach to mudmat design for static or static plus environmental loads and to on-bottom stability is presented. 866240 Foundation design and analysis aspects of piled offshore structures in soft soils in Sarawak and Sabah ~aters Simunyi, R: Van Beck, A W: Madden, P B Proe 8th Southeast Asian Geotechnieal Conference, Kuala Lumpur. Malaysia. 11-15 March 1985 Fl. PI 55-68. Publ Kuala Lumper. OrganisMg Committee. 1986 Axial and latend responses of 34 piled offshore structures havc been analysed. The difficulties in selecting suitable analytical methods and mathematical models to ensure conlidcncc in the ,,alidity of the analysis arc discussed, and the factors in platform design, assumed loading, soil properties and their measurement. ~hich are important to accurate analysis, are considered.

86624 I Design and installation procedures of piled foundations fi~r offshore platfi~rms t+ong Foo Wci Proc 8th Southeast Asian Geotechnical Conference. Kuala Lumpur. Alalaysia. 11-15 Alarch 1985 VI. PI 69-77. Putff [(ttaht Lutnptw: Or k,anishlk, Committee. 1986 The procedures adopted by Esso Petroleum for successful installation of 17 olt'shore structures are described. Site investigation, design loads (dead, operational and environmental), pile foundation design, idcaliscd load-deformation response of the pile, idcalisation of pile driving and installation procedures are considered. 866242 Plate load tests fiJr the ~,~est Papago/I-10 Inner Loop in Phoenix, Arizona Jones, G D; Dur,,ee, W .-\ Trans Res Rec N1044. 19,S'5, PI-5 Retaining ~alls I\~r this freeway ~ill have footings in desiccated silty clay, sandy cla', and clayey sand overburden. Plate load tests ~ere carricd out to see if bearing pressures greater than local practice could be used. A small test fill was construtted and tests carried out on this, and on natural ground, in the dry and ~etted states. Load-settlement curves ~ere ana[yscd, and the resulting ultimate loads used in the selection of gearing values for shallow spread footings within the o,,erburden. The permitted increase allowed considerable cost savings. 866243 Prediction of axial capacity of single piles in clay using effective stress analyses Hcydinger, A G: Ealy, C Trans Res Rec N1044, 1985, P5-13 A finite element program was used to calculate thc state of stress in soil around a pile. It takes into account effects of pile installation and soil consolidation, continuously updating the effective stress. Results are compared with a n approximate

See also. 866017 8660-4. 866203 866244 Salvajina: a concrete-faced dam on a difficult foundation Hacclas, J E: Ramircz. C A lnt Water Power Dam Constr V38. N6. June 1986. P18-24 The 148m high, concrete faced gravel-rockfill dam was constructed on difficult and variable foundations, which required the use of several corrective methods in toc slab design and foundation treatment. Foundation mapping showcd regions of competent, intensely fractured and intensely weathered rock. Weathered, crushed and friable rock was excavated, and consolidation grouting of fractured rocks undertaken. Grout curtains and a cutoff trench were installed. Embankmcnt zoning allowed economical use of the excavated soft rock in combination with gravel. The dana was completed in 1984 and negligible leakage and normal settlement have been observed. 866245 Use of decomposed granite rock for dam construction Lazanyi, I lnt IVater Power Dam Constr I'3S. N7. Jtdr 19S6. P25-28 Residual decomposed rock is used in some semi-arid arcas for earth dam construction. The material in situ shov,s considerable variations in beddimg and "~veathering, but, after multiplc handling during construction, becomes it thoroughly remoulded, fairly uniform, workable fill material. Compaction, permeability, drainage, erosion, strength and deformation properties are described, and some recommendations about the use of this material in dams are presented. 866246 Slide in upstream slope of Lake Shelbyville Dam Humphrey, D N; Leonards, G A J Geotech Engng Div ASCE l'112. N5, May 19,~6. P564-577 Key features of embankment design and construction of the Lake Shclbyville Dana. Illinois, USA, are presented. The dam was constructed of glacial till. with some sandy clay, clayey sand, sandy silt and a small amount of plastic clay. The nature and chronology of the slide are described and data on movements, shear strengths, and pore pressures are examined. Possible failure mechanisms are investigated and finally an exphmation for the slide is given. 866247 Instabilities v, ith large horizontal defl~rmations. Technical note Jonker, A Proc Symposium on Failures in Earthworks, London, 6-7 March 1985 P397-399. Puhl Lomhm: Thomas Tefford. 1985 For the reconstruction of an carth dam on very soft clay and pcat subsoils in Holland, an initial design without a dam bcrm was proposed in order to save materials. A test section was constructed and subjected to simulated extreme loadin,,_, when largc horizontal displacements occurred. In this condition, to complete the dana to the required height needed even more material. Slip circle analysis was undertaken, and it was assumed that in the zone of the subsoil covered by the set of slip circles with low stability, large shear strains or plastic deformations occurred. The dam was constructed using a germ,

1986 Pergamon Journals Ltd, Reproduction not permitted