The Shear Strength Characteristics of a Silty Clay Subjected to Freezing and Thawing PDF Download

Author: Leslie Yuan-Cheng Yao
Publisher:
ISBN:
Category : Frost
Languages : en
Pages : 404

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Author:
Publisher: Natural Resources Canada
ISBN:
Category :
Languages : en
Pages : 608

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Author: Christopher W. Swan
Publisher:
ISBN:
Category : Chicago Blue Clay
Languages : en
Pages : 11

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This paper presents the preliminary results of a laboratory study on the impact of one freeze-thaw cycle on the engineering properties of natural samples of Chicago Blue Clay (CBC). Freezing was performed in a closed system with freezing occurring simultaneously in all directions. Two types of consolidation tests were performed: incremental loading and long-term compression under a constant load. These tests were performed on specimens subjected to a cycle of freeze-thaw with results compared to tests on CBC in its natural state. For constant load consolidation tests, freezing and subsequent thaw of specimens was performed under the applied stress. Additionally, the Atterberg limits of CBC, in its natural state and after one freeze-thaw cycle, were also determined. Based on the test results in this study, it is clear that one cycle of freezing and thawing impacts both the consolidation behavior and limits of the samples. Specifically, for both the incremental and constant loading tests there is a significant increase (between 25 % and 40 %) in settlement during consolidation versus results of tests on CBC in its natural state. There is also a notable increase in the virgin compression ratio (Cc) and coefficient of consolidation (cv) upon thawing. Results of Atterberg limits indicate a decrease in the CBC's liquid limit that explains, in part, the increase in cv. Overall, the results indicate that the freezing and subsequent thawing of CBC has a severe impact on its consolidation behavior. The writers recommend that more testing be performed to verify and expand on the results determined from this preliminary evaluation.

Author: Lawrence Tsi-Ching Chung
Publisher:
ISBN:
Category : Clay
Languages : en
Pages : 172

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"The investigation was undertaken to determine shear strength and pore pressure parameters of a soil when subjected to sequential loading. This method is intended to similate the in-situ condition of stress application under certain field conditions. The testing procedure, a sequential triaxial shear test, is described. This test consists of successive stages of partial consolidation followed by undrained shear. Triaxial consolidation and shear strength characteristics of a sedimented remolded silty-clay are compared with the results from conventional tests on isotropically consolidated samples. The undrained strength was found to be a function of moisture content, irrespective of the method of test and initial stress system for the normally consolidated soil. A unique relationship was established between a pore pressure parameter, the ratio of the change in pore pressure to the effective vertical consolidation pressure, and undrained strength. It is concluded that this sequential procedure of testing does change the strength characteristics of the soil. These cannot be predicted from the conventional test"--Abstract, page ii.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1366

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Author: American Society of Civil Engineers. Soil Mechanics and Foundations Division
Publisher:
ISBN:
Category : Engineering geology
Languages : en
Pages : 1544

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Author: Ramachandra Phanikumar
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659392788
Category :
Languages : en
Pages : 68

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Shear strength of soils is an important engineering aspect because shear strength characteristics are widely used in various applications such as bearing capacity and earth pressure of soils. Shear strength of sands is somewhat simpler than that of clays, which are complex materials exhibiting engineering behaviour difficult to predict. Shear strength of clays depends of water content, drainage conditions, rate of loading and degree of compaction.Unconfined compression tests were performed on cylindrical samples compacted at different remoulded densities chosen from the compaction curves of the soil. Proctor compaction tests were performed on the soil at three different compaction energies corresponding to N=25, 35 and 50. Dry densities of test samples corresponding to water contents of 10%,12% and 14% were chosen from the three compaction curves pertaining to N=25,35 and 50. Remoulded cylindrical samples were prepared for the performance of unconfined compression tests at the above dry densities and water contents. Stress strain characteristics, variation of peak compressive stress with significant parameters were studied.

Author: American Society of Civil Engineers
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 890

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Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 748

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Author: United States. Department of Transportation. Office of University Research
Publisher:
ISBN:
Category :
Languages : en
Pages :

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