ISSN:0008-3674    

DOI:10.1139/t65-037

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-038

出版商:NRC Research Press    

年代:1965

数据来源: NRC

摘要:

This paper deals with the design, construction, and performance of a drydock in the St. Lawrence River enclosed by a till dyke dumped in water. Alternative designs and methods of selecting a suitable till are discussed. Construction procedures are described along with the installation of a two-stage wellpoint system to intercept seepage through the riverbed beneath the dyke. Particular emphasis is placed upon the methods of control and observations taken both during and after construction.It is concluded that a till dyke dumped in water can form as table and impermeable mass; however, care must be taken to apply any surcharge slowly to allow time for the dissipation of pore pressures in the underwater till.

ISSN:0008-3674    

DOI:10.1139/t65-039

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-040

出版商:NRC Research Press    

年代:1965

数据来源: NRC

摘要:

The paper describes the failure during construction of a proposed 70 ft. high railway embankment fill. The fill was built of a uniform clay of medium plasticity which was used at an average moisture content of 3 per cent greater than had been provided for in the design. The fill failed under its own weight when it reached a height of 55 feet.In order to assist in the design of stabilizing works three test holes were drilled in the fill and soil samples recovered. Properties of field compacted and laboratory compacted soil samples are compared. The age of both types of samples is shown to have a significant effect on the test results.Both total and effective stress analyses of the embankment at failure have been performed using the laboratory values of soil strength. The total stress analysis gives a safety factor of 1.0 at failure whereas the effective stress analysis gives a safety factor of 1.2. The hazards of choosing the correct value of laboratory shear strength for the total stress analysis are discussed.

ISSN:0008-3674    

DOI:10.1139/t65-041

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-042

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-043

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-044

出版商:NRC Research Press    

年代:1965

数据来源: NRC

ISSN:0008-3674    

DOI:10.1139/t65-045

出版商:NRC Research Press    

年代:1965

数据来源: NRC