Initial settlements of Raft Foundations on sand: A review

48A

problems. Describes the basis of the analysis and presents a ~,~ber of parametric solutions for the settlement ratio. Discusses the determination of the soil parameters required to apply these solutions in practice. Describes some cases where theoretical and observed pile group settlements have been compared and illustrates the use of the parametric solutions ani the construction of design charts from the solutions • 773125 RATIONAL ANALYSIS OF SHALLOW FOUNDATIONS CONSID~ING SOIL STRUCTURE INi~ERACTION Fraser, R A; Wardle, L J Aust Gec~ech J, VGS, NI, 1975, P20-25 The stiffness of a cross-anisotropic layered system is modelled by a surface element derived using integral transform theory. The surface element provides a rational model of soil stiffness which can be used in a wide variety of interaction studies when combined with plate-bending and beam elements in the finite element method. The parametric studies and examples presented confirm the need for considering soll structure interaction in building design.

773126 ROCK ANC~DRAGES (IN ITALIAN) Cestelli Guldi, C RIv Ital Geotec, VI0, NI, Jan-March 1976, P5-32 Reviews various types and principal applications of anchorages in loose and firm rocks. Three types of anchorages are defined amd discussed: active, passive amd mixed, the latter being based on both active and passive concepts. Criteria for planning the rock anchorages are also considered. 773127 STABILITY OF LIGHTLY LOADED FOUNDATIONS ON SEASONALLY FREEZINGGROUND (IN RUSSIAN) Vostretsov, 0 K Transp Strol% NI0, Oct 1976, P47-~9 773128 METHODS FGR R A ~ FOUNDATION DESIGN INCLUDING SOIL STRUCTURE I N A C T I O N Wardle, L J; Fraser, R A Proc Symp on Raft Foundations, Perth, 1975, Pl-ll Existing raft foundation design methods are discussed. A computer model for rectangular rafts on a layered soil system has been used to obtain graphical solutions for settlements arzl m a x ~ berzling moments in a uniformly loaded square raft resting on a homogeneous soil layer of finite depth. A simple hand calculation of an equivalent modulus and Poisson's ratio extends the applicability of the gral~hical solutions to multi-layered soil systems; The imlx~anee of consid~ing the rigidity of the superstructure is emphasized by cemparing the results of alternative amalytical methods.

for raft foundation design. Agreement between observ~dandpredlctedperfcammmce was excellent. 773130 ANALYSIS OF STIFFENED RAFY FOUNDATIONS ON EXPANSIVE SOIL Fraser, R A; Wardle I L J Proc Symposium on Recent Davelopm~nts in the Analysis of Soil Behaviour and their Application to Geotechnical Structures (Melbourne, 1975),V2, I~9-98 The Irediction of initial and final settlements of raft foundations is most rationally achieved by the consideration of an elastic supporting soil system which has a modulus increasing with depth or is of finite thickness. For the design of residential stiffened rafts on expansive soll an extension of this method is considered where the raft is assumed to be supported on an elastic mound with the above properties. The use of the method as an upper bound solution for routine design is examined.

773131 S ~ D Y OF AN~ORAGES IN FZS~RED R O ~ W ~ H PARTI~

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Picclnini, A Paper to 12th National Geotechnical Conference, Cosenza, Italy, 18-21 Sept 1975. Transactions, VI, P145-171 Results obtained by a tensile test on a first experimental foumdatlon showed economical advantages compared with the usual reinforced concrete foundations. Therefcre, the laws relating stress distribution in anchor steel, sealing morter and participating rock ere being studied. Initial results of the experimental l~rogran~ne sre discussed together with informal rules on material use. Testirg of the foundations of a 380kV line tower constructed using the method is described.

773132 OUTLINE OF SOLb~IONS AVAILABLE FOR THE DESIGN OF RAFT FOUNDATIONS Fraser, R A CSIRO Division Of Applied Geomechanics technical paper 25, 1976 An analysis of ~isting methods for the design of raft foundations is presented. In the main existing methods make use of elastic half space or simplified elastic st~plxrtlng systems: ~'le development of a method capable of anslysing cross anlsotropic l~yered systems provides a means for a more rational analysis of raft foundations. Avail: CSIRO, 372 Albert St, East Melbourne, 3002, Vic, Australia 773133 INITIAL S E T I ~ N T S OF R A ~ FOUNDATIONS ON SAND: A REVIEW ~'raser, R A CSIRO Division of Applied Geomecha.nics technical report 23, 1975

773129 REVIEW OF INVESTIGATION IN RAFT FOUNDATIONS FOR MAJOR BUILDINS ON DEEP SOILS Fraser, R A Proc Symposlun on Raft Foundations, Perth,

1975, F23-4O Measur~ner~s have been made of settlement, contact pressures and pore water pressures during a~d after construction of four raft foundations founded on deep interbedded sands. The observed performar~e was similar to elastic behaviour, and a medal of a plate on an elastic layered system of finite thickness was developed

Methods of design far foundations on sand ere reviewed, their applicability to raft foundations considered and a technique which enables the determination of the complete deflection 1~ofile for a raft foundation is remommended~ Avail: CSIRO Division of Applied GeomechaDics, PO Box 54, Mt Waverley, 3149, Vic, Australia