lateral thinking at gloucester leads to new ground rules : parkinson, j new civ engr, n506, sept...

Surface Structures

See elso: 832030

832127 LATERAL ~TINKING AT GLOUCESTER LEADS TO NEW GROUND RULES

Parkinson, J New Civ Engr, N506, Sept 1982, P14-15

Alluvial silt of the River Severn flood plain (a sensitive soil and susceptible to lique- faction) created problems in the construction of the new Gloucester bypass, UK. Settlement of the alluvium could be predicted, but not the induced lateral forces on piles supporting the proposed bridge crossing. Vane tests were carried out during embar~ment cor~truction to check decrease in shear strength of the alluvium. Results indicated that the ratio of vertical to horizontal movement was related to control of the shear stress. In addition the settlement readings taken were used to check a new finite element computer program developed to predict settlement from load application data. The cor- relation between prediction and measurement was good.

832128 NEW VEI~OD OF MEASURING DEFORMATIONS IN DIAPHRAGM I.~ALLS AND PILES. TECHNICAL NOTE

Kovari, K; Amstad, C Geotechnique, V32, N~, Dec 1982, I~02-406

Describes a new portable strain measuring device - the slidirg micrometer - which permits the complete state of deforn~tion of piles and diaphragm walls to be determined.

832129 PREDICTED A}D MEASURe0 RESILIENT RESPONSE OF TRACK

Stewart, H E; Selig, E T J Geotech Engmg Div ASCE, VI08, NUT11, Nov

1982, P!423-1442

Field measurmnents were made on a research track to determine the magnitude of elastic stresses, strains and deflections in the ballast, subbal- last and subgrade resulting from train loading. These data were analysed and compared with results predicted using the computer model GEOTRACK. A parametric study of the GEOT~&CK model was also carried out to investigate its sensitivity to the main track variables.

832130 S ~ N T S UNDER INTERMITTENT LOADING Becker, D E; Lo, K Y Proc lOth Interr~tional Conference on Soil

Mechanics and Foundation Er~dneering, Stockholm, 15-19 June 1981, Vl, F35-40. Publ Rotterdam: A. A. Balkema, 1981

A finite difference solution for the problem of axl-syrmmetric consolidation under l~- mittent loading of an anisotropic two-layer system has been developed, ard applied to the results of a three year field observation of pore pressures and settlements of a full scale structure founded on a ring foundation. The soil condition at the site consists of 3m thick clay crust overlying a 18m thick soft to firm clay deposit. The deformation and consolidation para- meters were determined from specimens trimmed from block samples. The method of analysis is briefly outlined and the results of comparison sh~ adequate agreement between the predicted and observed field behaviour throughout the

entire loading history. However, if the field case record is analyzed as a one-dimensional case, a correction factcr of 7 on the laboratory value of coefficient of consolidation is required to obtain reasonable agreement with the field bahaviour. Auth.

832131 LAND RECLAMATION USING FINE-G~\INED DREDGED ~TERIAL

Hartlen, J; Ingers, C Proc 10th International Conference on Soll

Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981, Vl, P145-148. Publ Rotterdam: A. A. Balkema, 1981

A dredged clay fill was deposited on the land to be reclaimed. Fourteen months later a test embankment was built incorporating settlement gauges, inclinometers and piezometers to moni- tor horizontal ani vertical movements, and consolidation, and settlement characteristics.

832132 ~'i'I'iEMENT ANALYSIS OF TANKS ON SOFT CLAY Hob-vat, K; Szavitz-Nossan, A; Kovacic, D Proc 10th International Conference on Soil


The paper deals with large settlements of a cylindrical oil tank during test loading. The tank is placed on layered soll where the layer of soft saturated clay is of particular interest. The settlements occur in undrained conditions. The analysis was made on the basis of the results of standard triaxial consolidated undrained tests with pore pressure measurement. The results of the tests are evaluated to yield rAmmrieal para- meters for describing stress-strain behaviour of given soll material. Using several numerical procedures the predicted values of settlements are obtained. These quantities are cc~pared with measured settlements. The drawbacks of ~resented procedures are analysed and their uncertainties along with their advantages are mentioned. Auth.

832133 PITFALLS OF BACK-ANALYSES Leroueil, S; Tav~nas, F Proc 10th International Conference on Soil


The back-analysis of case histories has become the l~eferred method of improving geotechnical knowledge, but on msny occasions it has proved urmeliable cr even misleading. Five examples are taken from practice to illustrate some major pitfalls of back-analyses: response of clay foundations to embankment loading, settlement, stability of cuttings and slope stability. Guidelines are consequently ;roposed to avoid these pitfalls and their embarrassing consequences on the development of geotechnique.

832134 FROBI]~S OF IN SITU CONTROL OF ~E-I'i'~EMENT mEDI~ION (I~ ~ )

Magnan, J P; Baghery, S; Deroy, J ~ Proc lOth International Conference on Soll


The validity of comparing the observed and cal- ct%lated behaviour of structures is examined. Problems encountered, in the interpretation of settlement measurements and pore pressure, vari-

lateral thinking at gloucester leads to new ground rules : parkinson, j new civ engr, n506, sept...

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