Comparison Between the Strengths of Undisturbed and Reconstituted Sands from Niigata, Japan PDF Download
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Author: Marshall L. Silver
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 60
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Book Description
Author: Marshall L. Silver
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 60
Get Book Here
Book Description
Author: Marshall L. Silver
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
Author: Marshall L. Silver
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 47
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Book Description
Laboratory cyclic triaxial strength tests were performed on undisturbed and reconstituted sand specimens from Niigata, Japan, to help evaluate how tests on reconstituted specimens can evaluate the cyclic strength of insitu cohesionless soils. Undisturbed specimens obtained from careful sampling with a large diameter sampler appeared to be of high quality, yet cyclic triaxial strengths measured in the laboratory were not particularly high. Specimens failed at cyclic stress ratios of about 0.15 at 20 stress cycles. Reconstituted specimens prepared by pluviating sand through water were weaker than undisturbed specimens by factors of about 1.22 to 1.16. The cyclic strength difference between reconstituted specimens prepared by pluviating sand through water and reconstituted specimens prepared by moist tamping was about the same as the strength difference between reconstituted specimens prepared by pluviating sand through water and undisturbed field specimens. Thus sand reconstitution techniques such as wet tamping may better model insitu soil behavior than reconstitution techniques such as pluviation for sands such as these at Niigata, Japan. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1048
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Author: Marshall L. Silver
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 186
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Book Description
Author:
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ISBN:
Category : Pavements
Languages : en
Pages : 722
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Book Description
Author:
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ISBN:
Category : Buildings
Languages : en
Pages : 932
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Book Description
Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 860
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1124
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Book Description
Author: Marshall L. Silver
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 164
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Book Description
Standard Penetration Tests, undisturbed field sampling, laboratory index property tests and laboratory cyclic triaxial strength tests were performed on cohesionless soils from Niigata, Japan, to determine why some soil deposits failed by liquefaction while apparently similar deposits remained stable during the 1964 earthquake. Undisturbed samples for testing were obtained from two relatively close-together sites underlain by essentially the same soil layer: a 'river site' where there was severe surface evidence of liquefaction following the 1964 earthquake and a 'road site' where surface evidence of liquefaction was not observed. Undisturbed soil sampling was performed with a newly-designed Japanese large diameter sampler and with an Osterberg sampler, so that U.S. and Japanese sampling procedures could be compared. Field procedures for obtaining small diameter specimens from a large diameter sample were shown to be a meaningful way to avoid sample handling problems. This is especially true if field freezing is also used to immobilize the fabric of the soil. It was found that field freezing with liquid nitrogen and storage of the samples in dry ice was a convenient way to transport and store both large and small specimens. In relatively clean, cohesionless soils which are not susceptible to frost heave, such freezing does not seem to significantly alter the soil fabric or sampled density.
