摘要:

A survey is presented of published data and data from private files concerning the effect of cyclic loading on the strength of clay soil. All clays develop significant cyclic strains under pulsating stresses, and the strength after cyclic loading is less than the normal static undrained strength. Reversing cyclic stress is more detrimental than one directional cyclic stress. This cyclic deterioration appears to be a strain dependent process whereby cyclic strains develop large excess pore pressures that in turn lead to softer and weaker soil.

ISSN:0360-8867    

DOI:10.1080/10641197609388162

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The primary objective of this study was to investigate the resistance to the operation of underwater equipment on the ocean floor. In the laboratory, tests were performed in a test tank on medium‐to‐coarse sand. The test objects were concrete blocks, concrete cylinders, and steel chains. These objects were towed on the surface of test soil at various speeds to predict the lateral resistance of an object on the ocean floor. Field tests were conducted at the bottom of Bonnet Shore Cove in Narragansett Bay, Rhode Island, in about 8 m of water. A concrete block was towed at two different velocities. The measured towing forces were in good agreement with the predicted loads, verifying the applicability of the results of laboratory study.

ISSN:0360-8867    

DOI:10.1080/10641197609388163

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The Giant Piston Corer has been used to obtain good quality sediment samples from several sedimentological/acoustic regimes in the northwestern Atlantic. A total of 185 m of sediment were recovered in nine cores with lengths ranging from 6.5 to 30.5 m. Sediment types include calcareous ooze, pelagic brown clay, organic‐rich gray‐green silty clay, and graded sand. Data are presented from three of these cores, taken from three different acoustic provinces.

ISSN:0360-8867    

DOI:10.1080/10641197609388164

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

The Haamer vibrocorer is a cheap and easily handled sampler for containing continuous cohesive or cohesionless sediment cores. This vibrocorer can be handled on board an ordinary trawler or small vessel. The penetration of the sampling barrel is actuated by two synchronized vibrators. Additional penetration force is provided by the buoyancy of a guiding buoy. To extend the maximum sampling length and to decrease the degree of disturbance, the vibrocorer is equipped with a plastic foil, which encases the core as it enters the liner and reduces inside friction. By providing the sampler with jetting water, the necessary penetration force is decreased. Testing a prototype is always difficult, but a working cycle of up to three cores an hour has been reached using a 6 m vibrocorer. A limited investigation has been conducted to determine the quality of the recovered cores; however, because of the poorly defined quality of the reference samples, no definitive answer to the question of sample disturbance can be given.

ISSN:0360-8867    

DOI:10.1080/10641197609388165

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Physics of Sound in Marine Sediments (Marine Science, Vol. 1)by Loyd Hampton (Editor). Plenum Press, New York, 1974. 569 pp. $32.50.

ISSN:0360-8867    

DOI:10.1080/10641197609388166

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0360-8867    

DOI:10.1080/10641197609388167

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0360-8867    

DOI:10.1080/10641197609388161

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor