Deformation characteristics of Malaysian offshore clay subjected to undrained cyclic constant-volume direct simple shear loading were investigated at different over-consolidation ratios and strain levels. Cyclic strain-controlled tests were undertaken with cyclic shear strain amplitudes ranging from 0.6% to 5%. As the number of cycles increased, it was observed that the cyclic stress amplitude ...
Soft clay forms a big proportion of the seabed ground. In a marine environment, waves, wind, and earthquakes, often known as cyclic loads, are a main contributor to the loading of the seabed. The safety of offshore structures relies on the response of soft marine clay to these cyclic loadings. Its very fine-grained composition, and hence low permeability, is the defining factor for soft marine ...
Fig.1 In situ shear device on location . The apparatus was in reality a gigantic self-boring sampling tube that trimmed out a vertical core of undisturbed clay, one meter in diameter, as it burrowed into the ground. When a shear test was desired the boring process could be stopped and the clay core within the device sheared in simple undrained ...
Understanding the behavior of soft sensitive clays is a key aspect of geotechnical design, especially in those regions where constructions are planned in marine clay areas. In Finland, one of the major geotechnical issues is the stability and deformation of the railway embankments located on soft soil deposits. The Tampere University of Technology (TUT) and the Finnish Transport Agency …
primarily derived from direct simple shear (DSS) testing where one-dimensionally consolidated soil specimens were initially subjected to monotonic or cyclic constant volume shearing. An NGI-type (Bjerrum and Landva 1966) DSS testing device at the University of British Columbia, Canada, was used for the testing program, and
Simple shear of an undisturbed soft marine clay in NGI and torsional shear equipment : Talesnick, M; Frydman, S Geotech Test J V14, N2, June 1991, P180–194 | | download | BookSC. Download books for free. Find books
A comparative study of the NGI Direct Simple Shear Test (DSST) and the Mikasa Direct Shear Test (DST) is reported. Samples from Norwegian Drammen clay and Japanese Ariake clay were subjected to both types of test.
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ice age. (NGI, 1982) Figure 1 A simplified drawing showing clay particles in materials sedimented in a) a marine environment and b) a fresh water environment. (Statens vegvesen 2010 - figure from Leirskred i Norge by Jørstad F.A., 1968). A popular illustration of the marine clay "card-house" structure is shown in …
Article "Simple Shear of an Undisturbed Soft Marine Clay in NGI and Torsional Shear Equipment." Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. By linking the information entered, we provide opportunities to make unexpected ...
SIMPLE SHEAR OF AN UNDISTURBED SOFT MARINE CLAY IN NGI AND TORSIONAL SHEAR EQUIPMENT. A series of undrained, simple shear tests were performed on undisturbed, soft, marine clay from the continental slope of Israel in a direct simple shear device (NGI) and in a new torsional shear apparatus.
Sample quality and disturbance in soft marine clay ... 5.1 History of undisturbed soil sampling 24 5.2 Sampler design 24 5.2.1 Area ratio 25 ... DSS direct simple shear ESP effective stress path GWL ground water level NGI Norwegian Geotechnical Institute
(maximum shear modulus) can be measG max ured by bender elements in top and bottom of specimen by measuring the shear wave velocity Key NGI references: Bjerrum, L. and A. Landva (1966): Direct simple shear tests on a Norwegian quick clay. Geotechnique, Vol.16. , pp. 1-20. Also NGI Publ. No. 70. Dyvik, R., T. Berre, S.
the Norwegian Geotechnical Institute (NGI) direct simple shear device. The NGI device is an accepted and appropriately sophisticated apparatus for the measurement of cyclic strength characteristics of fine grained cohesive soils. Recently, an investigation was completed by Zimmie and Floess (24) using the NGI direct simple shear apparatus and ...
Quick clay behavior is primarily characterized by a material property known as sensitivity, a term utilized in soil mechanics to define the ratio between the undisturbed and the remolded shear strength of a soil material. In Figure 1, stress-strain response examples of clay materials (sensitive and non-sensitive) are presented. In sensitive ...
Undisturbed sampling for examination and testing of specimens in the laboratory is in simple shear tests and active and passive triaxial tests. results from CRS oedometer tests and triaxial tests on soft marine Norwegian clay taken by the NGI 54 mm sampler and the Sherbrooke sampler.
Abstract: The behavior of stress, strain, pore pressure and static undrained shear strength of undisturbed or remolded marine silty clay samples under undrained cyclic loading conditions is analyzed. The degradation of undrained shear strength is related to the cyclic strain and accumulated pore pressure produced by undrained clyclic loading.
1980's measured the in situ undrained shear strength using an Acker torque wrench with thick drillers vanes. This equipment is crude and unreliable in soft sensitive clays. Beginning in 1994, the undrained shear strength of the soft clay at the site was measured in situ using the Geonor vane borer H-10 testing apparatus (Fig. 6).
A series of undrained, simple shear tests were performed on undisturbed, soft, marine clay from the continental slope of Israel in a direct simple shear device (NGI) and in a new torsional shear apparatus. The new apparatus is described, and the problematics of simple shear testing in both devices are discussed. Most previous torsional shear testing on clays reported in the literature has been ...
ABSTRACT In order to investigate the cyclic shear properties of clays for insitu condition, undisturbed marine clays have been sampled from various places in Japan. The properties of the clays depend not only on characteristics such as their plasticity but also their sedimentary origins, fabric and stress path. A series of cyclic triaxial tests has been performed at varying plasticity indeces ...
Key words direct shear test direct simple shear test laboratory tests sample disturbance soft clays (IGC : C6/D6) REFERENCES 1) D.W. Airey, D.M. Wood, An evaluation of direct simple shear tests on clay Geotechnique 37: 1 (1987) 25-35 Airey, D. W. and Wood, D. M. (1987): An evaluation of direct simple shear tests on clay, Geotechnique, 37 (1 ...
A study of the effect of cyclic loading frequency on the dynamic properties of saturated soft marine clay was presented. The research was based on a series of stress-controlled undrained one-way loading cyclic triaxial tests conducted on normally …
Kinematic hardening of soft clay in simple shear more. by Sam Frydman. ... Simple Shear of an Undisturbed Soft Marine Clay in NGI and Torsional Shear Equipment more. by Sam Frydman. ... Stress-dilation behavior of undisturbed sand samples tested in both drained and undrained triaxial shear has been studied. The stress-dilation relation is ...
A study of the effect of the overconsolidation ratio (OCR) on the cyclic shear modulus degradation of clay is presented. The research is based on a series of strain‐controlled, constant‐volume, cyclic, simple‐shear tests conducted on samples of an offshore Venezuelan clay consolidated to OCR=1, 2, and 4. The modulus degradation with number of cycles is successfully modeled for different ...
Breakdown of the clay structure, including cementation bonds, is the assumed cause of lower shear resistance at small strains, whereas at large strains the shear resistance is governed mainly by the water content, which for soft clay samples, reconsolidated to the in situ effective stresses, will be lower, and the strength thereby higher, the ...
Shear strength variation with depth for direct simple shear tests and active and passive triaxial tests. stable, This occur locally behind the slide edge, resul- ting in relatively small slides, each taking a certain time to develop, 'The remaining 92-94% of the sliding took $ minu- tes or less, and was made up of large flake-type slides.
Undrained shear strength data for low OCR soft clay site, Haltenbanken area of the Norwegian Sea. DeGroot et al. (2010) Consequences of poor quality sampling Axial Strain (%) 0 2468 10 Shear Stress (kPa) 0 10 20 30 40 p' (kPa) 20 40 60 80 q (kPa) 0 20 40 Block 76 mm Tube 54 mm Tube (a) (b) Vertical Effective Stress, σ'v (kPa) 10 100 1000 ...
Tests on undisturbed and remoulded Drammen clay consolidated to stresses much higher than the in situ effective overburden stress give almost identical results. Thus the effects of sample disturbance and in situ structure in the clay were eradicated. Key words: soft clays; laboratory tests; direct shear test, direct simple shear test. INTRODUCTION
Simple Shear of an Undisturbed Soft Marine Clay in NGI and Torsional Shear Equipment; Simple setup for rapid testing of third-order nonlinear optical materials; Simple similarity-based question answering strategies for biomedical text; Simple Services, Inc.: A Case Study in Ownership Transition; Simple shear deformation - crystal plasticity study
Consolidated, constant volume (CCV), cyclic laboratory shear tests were performed on marine clay soils. The Norwegian Geotechnical Institute (NGI) direct simple shear device, modified for cyclic loading (square wave) capabilities, was used for these tests. Two clays were investigated; a natural undisturbed Gulf of Mexico clay and a reconstituted Pacific Illite.
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