French nuclear power plants foundations (in French)

French nuclear power plants foundations (in French)

135A improvement are considered. Soil structure interaction, in particular settlement, is discussed, and analysis methods using finite elements and th...

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135A improvement are considered. Soil structure interaction, in particular settlement, is discussed, and analysis methods using finite elements and theologic models illustrated. Foundation monitoring is discussed. Finally, experience to date and future work are summarised.

Foundations See also: 883088, 883116, 883247 883251

Cyclic axial displacement tests on medel piles in clay. Technical note Procter, D C; Khaffaf, J H Geoteclmiq~ V37, N4, Dec 1987, P505-509 During storm loadings, offshore piles in clays may temporarily lose pullout resistance due to the generation of excess pore pressure at the pile-soil interface. Long term cumulative effects may also affect interface shear strengths. Instrumented model tests have been carried out to investigate pore pressure build up and dissipation in the clay bed, the extent of the region of pore generation, and the variation of the effective earth pressure during cyclic loading. 883252

Axial and lateral respome of pile groups embedded in n o ~ m ~ m e o m soils Chow, Y K lm J Num A ~ I Meti~ Geomecit VII, 316, Nov-Dec 1987, P621-638 A numerical method, based on elastic theory, to analyse axially and laterally loaded pile groups in inhomogeneons soils is presented. The group piles are discretised into discrete elements and the inhomogeneous soil behaviour determined from a finite element procedure. The load-deformation behaviour of the pile group system is found by considering the equilibrium of pile-soil interaction forces. Comparison with field tests indicates that the model predicts deformation behaviour well, except for closely spaced laterally loaded pile groups, where computed behaviour is too stiff at high load levels.

883256

Rational field of application of built-up pile foundations of Pridatko, Y M; Shabrov, V L; Svetinskii, E V; Valeev, R K Soil Mech Fmmd Engng V24, N2, March-April 1987, P47-50 In order to develop simplified methods of assessing suitability and economics of foundation designs for residential buildings, a series of nomograms has been developed, which takes into account pile characteristics (length, section, type of reinforcement, type of joint), costs of transportation and costs of installation. Examples of their use are presented.

883257

Construction of tall buildings on loess soils, using controlled

soaking Zaborotnii, A F Soil Mech Fontal F.sgmg V24, N2, March-April 1987, P50-54 Structures on shallow mat foundations on loess soils suffer unacceptable settlement if these soils become accidentally wetted. Preliminary soaking in excavation pits can eliminate only self-weight collapse of the loess. A new procedure has been developed whereby further controlled compaction under the weight of the structure takes place during or after construction.

883253

Interaction between torsional and axial pile responses

Georgiadis,M lnt J Num Anal Meth Geomccll VII, N6, Nov-Dec 1987, 1'645-650 The effects of axial load on torsional pile response and torque on axial pile response are investigated. A computer program was developed which uses the transfer matrix method to analyse a pile supported by a series of coupled axial and torsional elasto-plastic springs. Results indicate that ultimate torsional and axial pile capacities, as well as axial displacements and rotations, are significantly affected by the combined load action. 8832.M

Pemtration of jack-up platform footings into the seabed Werno, M; Juszkiewicz-Bednarczyk, B; Inerowicz, M M m Geoteck V7, N2, 1987, P65.78 A method used to predict leg penetration prior to installation of a three-leg jack-up mobile drilling unit is described. The method is based on a two-step bearing capacity procedure. A comparison of predicted and observed values for penetration indicates the reliability of the method. 883255

French nuclear power pism~ fonndadon (In French) Costaz, J L; Haghgou, M Rev Fr Geoteck N41, 1987, P7.28 Foundation designs for power plants in France are briefly described. Economic, geological, and technical factors in the choice of sites are listed. Geological and hydrological requirements, seismic risk analysis, and site investigation and

883258

Bearing capacity analysis of a normally comondated day foundation Asaoka, A; Ohtsuka, S Found V27, N3, Sept 1987, 1'58-70 A simple numerical method to obtain values of ultimate bearing capacity of a normally consolidated clay foundation as a function of loading history and drainage condition is developed. It is based on the critical state concept with use of plastic finite element analysis. Bearing capacity analysis for undrained, partially drained and drained conditions is included.

883259

Prebubllistk analysis of the staldiity of massive bridge abutments using simulation methods Biernatowski, K; Pula, W Struct Safety VS, NI, Jan 1988, PI-15 A procedure based on simulation techniques is presented. Five possible failure mechanisms are considered. Polygonal probabifity distributions of random soil properties are used. Numerical analysis of the influences of individual parameters on loss of stability is carried out. Accuracy of the calculations is discussed. The randomness of the friction angle in the soil layer directly below the abutment base has the greatest effect on probabilistic characteristics of stability. The probability and normal distributions for the case of exceeding bearing capacity may differ significantly.

1988 Pergamon Press pie. Reproduction not permitted