314A

in the foundations. Graphite conducting paper impregnated with electrolytes of different conductivities was used to simu- late the foundation strata. Choice of electrolyte, the model, and similitude are described. Effects of upstream blanket length on seepage discharge have been examined for cutoff depths of 0-32m.

935362 Utilization of economical slopes for Jordaneile Dam Wilson, J A; Engemoen, W O; McLean, F G; Hensley, P J Proc Conference Stabih'ty and Performance of Slopes and Embankments !I, Berkeley, 29 Jane-I July 1992 V1, P653- 668. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

Jordanelle Dam is a compacted zoned earthfill dam under con- struction in Utah. High quality core and fill materials are found in the reservoir area. The use of these in combination with a sloping core allows economical design with upstream and downstream slopes of 1:2 and 1:1.5 respectively. Seismic analyses have confirmed dam stability against earthquakes on the Wasatch Front or other local seismic sources.

935363 Design of the Charter Oak Bridge embankments Smith, A D Proc Conference Stability and Performance of Slopes and Embaakmems I!, Berkeley, 29 Jane-I July 1992 V1, P721- 736. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication ~1o 31)

A new bridge in Hartford, Connecticut, required embank- ments 15m high over 30m of soft Connecticut Valley Varved Clays. Detailed field and laboratory tests were carried out for site characterization and stability analyses undertaken. The design adopted used staged construction, with preloads, surcharges, lightweight fill, and vertical drains to limit post- construction settlement. Primary settlement was close to pre- dicted value, although settlement rate was faster than expected. Secondary compression was slightly below design objective.

935364 Threatened levees on Sherman Island Foott, R; Sisson, R; Bell, R Proc Conference Stability and Performance of Slopes and Embankments II, Berkeley, 29 Junc-I July 1992 V1, P756- 774. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

Severe vertical cracking was observed in 1990 on levees pro- tecting Sherman Island on the Sacramento Delta, California. The levee foundations are peats and silts, much compressed over many years, then silts and clays over sand. Stability anal- yses were carried out. It is noted that where failure is primarily related to deformation in the foundations soils, classical limit equilibrium analysis can overestimate stability. Remedial mea- sures included stabilisation berms, vibratory compaction, and re-establishment of the crown. Drying of peat due to drought and farming practices is thought to have led to the failure.

935365 Performance of test fill constructed on soft peat Tillis, R K; Meyer, M R; Hultgren, E M Proc Conference Stabik'ty and Performance of Slopes and Embankments I1, Berkeley, 29 Jtme-I July 1992 V1, P775- 787. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

A test fill embankment was constructed prior to development of the Wilkerson Dam on Boudin Island in the Sacra- mento/San Joaquin Delta. The site is underlain by 3-3.5m of

soft peat. The 100m by 60m embankment was designed so plane strain conditions applied in the central portion. One side was rapidly loaded to failure, the other stage loaded. Back calculated and laboratory values of undrained shear strength of the peat and measured and predicted values of settlement rate are compared.

935366 Subsurface characterization and design of an ash landfill on varied clays Vaghar, S; Bemben, S M; Walbaum, M Proc Conference Stability and Performance of Slopes and Embankments !I, Berkeley, 29 Jane-I July 1992 I/1, P788- 803. Publ New York: ASCE, 1992 (ASCE Special Geotechnical Publication No 31)

Investigations into the feasibility of dumping residual ash at a site in New Jersey are presented. The site is covered by refuse fill over peat and silty sand, then varved clays and silts and glacial till, all in a weathered bedrock valley. Subsurface exploration to establish soil profile and properties is described. Stability analysis showed deep slip surfaces, including seg- ments along clay varves, gave the lowest safety factors. The design specified includes deep excavation, foundation drain- age, stabilised ash fill, and above-ground retaining walls.

935367 Plastic waste low-weight embankments for pavements comtn~tion on soft soil Daudon, D; El Ghocbe, H; Coulet, C Proc lntermationul Comference on Geoteclmicul Engineering for Coastal Developmem, GEO470AST'91, YokaLama, 3-6 September 1991 V1, P777-781. Publ Japan: Coastal Development Institute of Technology, 1991

The use of blocks of compressed plastic waste as a lightweight fill for embankments on soft foundations is described. The waste is highly compressed then bound to form gabion-like blocks. An experimental embankment of height 4.6m has been constructed around a core of 3 rows of the blocks with total height 3.6m. Settlement and stresses have been monitored for a 6 month period. Results are such that applications at real sites are proposed.

Hydraulic structures

See also." 935072

935368 Performance of deep-corrugated steel box-type culvert Rauch, A F; Sargand, S M; Hazen, G A J Geotech Engng Div ASCE Vl19, N3, March 1993, P433- 452

A 4.6m span by 1.5m rise box-type culvert of 140mm deep corrugated cross section without transverse rib stiffeners was instrumented to measure deformations and stresses as it was backfilled. Further data were obtained on response to station- ary vehicular loads. Numerical simulation was carried out using the finite element code CANDE and a hyperbolic consti- tutive model for the backfill sands. Numerical results and field data are compared. High stress levels as a result of construc- tion equipment operating on nearly completed backfill were observed.

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