Footings and constitutive laws

95A ferent densmes m the devtce, and load transfer patterns were measured for varying depths ofpenetrataon for compresswe and uphft loading The load transfer patterns were s~mdar, m most respects, to those measured m full-scale tests m sands Auth 853255 Limiting pressure on a circular pile loaded laterally in cohesive soil Randolph, M J, Houlsby, G T Geotechnique V34, N4, Dec 1984, P613-623 In analysing the undrained loading of laterally loaded pdes, the ultimate lateral resistance at depth to purely horizontal movement ~s an ~mportant quantity If sod ~s modelled as a perfectly plastic cohesive material, calculatmn of th~s quantity reduces to a plane stram problem m plasticity theory, in which the load ~s calculated on a long cyhnder which moves laterally through an infinite medium An exact calculatmn of the load on such a cyhnder ~spresented Results are d~scussed m the context of prevmus calculatmns for the lateral load capacity of piles and are compared w~th approximate calculations using cawty expansion theory and a wedge failure near the sod surface 853256 Blasting technique aids steel pile driving Patey, D R Ground Engng VI7, N7, Oct 1984, P25-27 The Rosenstock Shock Blast techmque was used to drive sheet piles into ground consisting of 4m of fill over 1 lm of sand, gravel, cemented shells and clays The techmque uses low power explosives to create a shock wave which fractures strata, reducing rock to granular matenal, w~th no displacement, but separatmn into constltuent particles Both time to drive and number of blows to set are slgmficantly reduced 853257 Forced flexural vibrations of a Timoshenko column supported by an elastic half-space Wada, H lnt J Engng Sci V22, NI, 1984, PI-12 Foundation flexlbfl~ty has slgmficant effects on the vibrations of structures Flexural vibrations can be important for slender structures The plane stress problem offlexural vibrations of an elastic column supported by an elastic half space ~s examined by applying Tlmoshenko's theory Results are compared to those from the Bernouflh-Euler theory The effects of column slenderness and foundatmn stiffness on the resonant frequency of the system are clanfied 853258 Trapezoidal footings on non-linear subgrades Chandra, S, Madhav, M R, Iyengar. N G R int J Num Anal Meth Geomech V8, N6, Nov-Dec 1984, P519-529 A trapezoidal footing with constant depth, resting on a nonhnear subgrade, is analysed A fourth order non-linear dlfferentml equatmn is arnved at and an approximate solutmn obtained using the Galerkm techmque A free-free footing with end loads and a fixed-fixed footing w.th evenly distributed loads have beenconsldered Results are presented for rangesoffootmgand soft parameters, as non-dimensional charts 853259 Footings and constitutive laws Prakash, S, Saran, S, Sharan, U N J Geotech Engng Div ASCE VIlO, NIO, Oct 1984, P14731488

A model is proposed to describe pressure settlement charactenstlcs of footings A s~mphfied stress d~stnbutmn is assumed and constltutwe equatmns for the sods obtained using Kondas' 2-dlmensmnal hyperbola The analysis accommodates changes m shape, loading condltmns, base roughness and flexlblhty and ~s in good agreement w~th expenmental results Ultimate beanng capacity, settlement at failure and the relatmn between settlement and footing d~mensmns are examined 853260 Torsional vibration of anisotropic halfspaee Constantmou, M C, Gazetas, G J Geotech Engng Div ASCE 11110, Nil, Not 1984, P15491558 Torsmnal harmomc vlbratmn of surface and embedded foundatmns m a cross-amsotrop~c soft deposit are examined mathematically using a model mvoiwng geometric and matenal transformations s~mflar to those used m studymg seepage through an hydrauhcally amsotrop~c medmm Static and dynamic torsmnal stiffness and dampmg coetiiclents are presented, for apphcatlon to other problems The effect ofmatenai amsotropy ts explained using a factor relating shear moduh, measunng suffness, against d~stortmn in horizontal and vertical sod elements 853261 Stability of spread footing above void in clay Badle, A, Wang, M C J Geotech F,ngng Div ASCE VIlO, Nil, Not 1984. P15911605 A theoretical analysis and laboratory model testing were used to evaluate the effect of a contmuous void on stablhty of footings An elastically perfect plastic medium was assumed for theory, 95% compacted kaoilmte used m testing A three dimensional finite element computer program was developed and used to analyse stabdlty There is a critical region under the footing where the void affects stability The size and site of this regaon are dependent upon soft properties, footing design, void shape and, m particular, void site 853262 Piles in sand: a method including residual stresses Bnaud, J L, Tucker, L J Geotech Engng Div ASCE VIIO, Nil, Nov 1984, P16661680 Neglecting residual stress In conventional load tests on pdes leads to miscalculation of true point and friction loads A method of mathematical analysis is proposed for load distribution for vertical plies m sand Based on a 33 pile database and results of Standard Penetration Tests, hyperbolic models are used to descnbe the friction and point pressure transfer curves and predict the load settlement curve for the pile head 853263 Tests on model tension lilies Levacher, D R; Sleffert, J G J Geoteck Engng Div ASCE VIIO, NI2, Dec 1984, P17351748 A series of model piles were dnven into sand In laboratory tests, using high frequency vlbro-drlvmg and drilling methods and bored pdes Ultimate pulling resistance was measured and results show slgmficant influence of the placement method