摘要:

The Shellmouth Dam on the Assiniboine River is a flood control project now being built by the federal and Manitoba governments. The upper 50 ft. of foundation at the dam site is a medium to highly plastic alluvial clay deposit containing sand layers and lenses. This is underlain by up to 100 ft. of sands and gravels to shale bedrock.This paper describes the design, construction, and instrumentation of a test fill built at the site of the proposed dam, and includes summaries of pore pressure and movement observations, settlement studies, and stability analyses.

ISSN:0008-3674    

DOI:10.1139/t65-027

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-028

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-029

出版商:NRC Research Press    

年代:1965

数据来源: NRC

摘要:

Because of soft foundation soil it was necessary to use two-stage construction for a double-track railway embankment varying in height from 21 to 33 feet. Effective stress methods of analysis were used and piezometers were installed in the foundation soil to indicate the pore pressures. Pore pressures measured during the first-stage loading indicated that the second stage could be added to complete the embankment about a year after the first stage. Measurements of pore pressures continued during the second stage loading so that a continuing check on stability could be maintained. The embankment was successfully completed.

ISSN:0008-3674    

DOI:10.1139/t65-030

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-031

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-032

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-033

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-034

出版商:NRC Research Press    

年代:1965

数据来源: NRC

摘要:

During the construction of a 19 ft. high roadway embankment at New Liskeard, Northern Ontario, on varved clay, a failure involving half the width of the embankment occurred, extending for a length of 350 ft. A comprehensive investigation was carried out, including continuous sampling andin situvane tests at 2 ft. intervals to locate the failure zone.Stability analyses were carried out both for the failed and the stable side of the embankment, assuming different values of fill strength and depth of tension cracks.Prior to construction, 30 piezometers and 14 settlement gauges were installed at a section close to the failure region. Extrapolation of the pore-pressures measured at this location to the failure section enabled the stability study to be performed in terms of effective stresses. Analyses were also carried out for the instrumented section both in terms of total and effective stresses.The results of this study show that: (a) The discrepancy betweenin situvane and laboratory tests carried out in the varved clay stratum is of the same order of magnitude as those experienced in homogeneous deposits. (b) Theanalysis gives approximately correct factors of safety in all the cases analysed when both fill strength and effect of tension cracks are taken into account. (c) The factors of safety given by effective stress analysis appear to be too high.The remedial measures subsequently carried out for the failure region are described.

ISSN:0008-3674    

DOI:10.1139/t65-035

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-036

出版商:NRC Research Press    

年代:1965

数据来源: NRC