摘要:

A study was carried out to investigate the simple shear behaviour of a clay from the Israeli continental slope, and to consider the relevance of this behaviour to the stability of the slopes during earthquake conditions. Norweigian simple shear apparatus was modified in order to enable both static and cyclic shearing of undisturbed samples taken from the slope.

ISSN:0360-8867    

DOI:10.1080/10641198809388214

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

One parameter needed for the stability analysis of seafloor mud‐covered slopes is the undrained shear strength, cu, of the mud. A literature review dealing with mudslides shows that six methods exist to measure the cuof muds either in the laboratory or in the field. These methods are: 1) the vane shear test, 2) the cylinder‐strength meter test, 3) the sphere‐strength meter test, 4) the cone penetrometer test, 5) the pullout test using a cylinder, and 6) the use of the vertical profile of a mudslide in the direction of movement. The present study reports a laboratory investigation of the undrained shear strength of artificially prepared muds using the six methods in order to evaluate their accuracy.

ISSN:0360-8867    

DOI:10.1080/10641198809388215

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Most of the Greater Cochin area, which is undergoing rapid industrialisation, consists of extremely soft marine clay calling for expensive deep foundations. This paper presents a study on the physical properties and engeering characteristics of Cochin marine clays. These marine clays are characterised by high Atterberg limits and natural water contents. They are moderately sensitive with liquidity indices ranging over 0.46 to 0.87.

ISSN:0360-8867    

DOI:10.1080/10641198809388216

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

In some areas, the sea floor contains a surface layer with high porosity and a thickness of 10–30 cm. The characters of an explosive pulse reflected at such a sea floor are discussed. The thickness and porosity estimations for the surface layer by acoustic method are studied, and the estimated and measured results are listed.

ISSN:0360-8867    

DOI:10.1080/10641198809388217

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The Nares Abyssal Plain is situated in the Western North Atlantic between 22° and 25° N and 60° and 67° W. This distal plain is connected to the Hatteras Abyssal Plain by the Vema Gap. The study site contains pelagic and hemipelagic sediments with upper meters containing predominantly finegrained turbidites. Large diameter piston cores up to 26 meters in length were obtained within the southern region of the Nares. This study focused on the stress‐strain and strength properties of the pelagic clay units of the sediment column. A significant portion of the sediment column was found to be in a state of under‐consolidation attributed to impeded drainage caused by apparent over consolidation of the surficial zone and significant variations in permeability between pelagic and turbiditic layers. Effective friction angles ranging from 19.9 to 31.6 degrees were generally higher for isotropically as opposed to anisotropically consolidated triaxial series. Additionally, there were correlations between friction angles and silt content. Stress‐strain behavior for anisotropically consolidated samples illustrated brittle failures and low failure strains ranging from .7 to 4.2 percent. Isotropically consolidated samples revealed plastic type failures with failure strains ranging from 5.0 to 19.0 percent strain. Average horizontal to vertical effective stress ratios averaged from .57 to .59. An undrained vane shear strength profile ranged from 3 kPa at 2.0 m to 28 kPa at 25.7 m. Undrained shear strengths determined using triaxial parameters and plasticity indices were generally higher than the vane shear strengths. A critical state strength equation yielded strengths most compatible with the vane shear profile.

ISSN:0360-8867    

DOI:10.1080/10641198809388218

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Robert J. Weimar, Katrn W. Porter, and Cooper B. Land, Depositional Modeling of Detrital Rocks, with Emphasis on Cored Sequences of Petroleum Reservoirs (SEPM Core Workshop No. 8, Golden, Colorado, August 10–11, 1985: Society of Economic Paleontologists and Mineralogists, 1985), 252 pp.

ISSN:0360-8867    

DOI:10.1080/10641198809388219

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0360-8867    

DOI:10.1080/10641198809388213

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor