Long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles

HAN Jian; YAO Yang-ping; YIN Zhen-yu

doi:10.11779/CJGE201712010

Volume 39 Issue 12

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Chinese Journal of Geotechnical Engineering > 2017 > 39(12): 2219-2225. > DOI: 10.11779/CJGE201712010

HAN Jian, YAO Yang-ping, YIN Zhen-yu. Long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(12): 2219-2225. DOI: 10.11779/CJGE201712010

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Long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles

1. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;
2. Department of Geotechnical Engineering, Key Laboratory of Geotechnical and Underground Engineering of Ministrey of Education, Tongji University, Shanghai 200092, China;
3. Ecole Centrale de Nantes, Research Institute of Civil and Mechanical Engineering, Nantes 44300, France

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Received Date: August 31, 2016
Published Date: December 24, 2017

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Abstract

The wave and wind loadings applyed on structure foundations with a large number of cycles affect the long-term undrained mechanical behavior of clay, which is one of key issues for the foundation design. Qwing to lack of cyclic tests with a large number of cycles up to now, laboratory tests on over consolidated clay are perfomed to study the cyclic behavior with a large number of cycles (e.g., more than one million). Based on the results of reconstituted specimens with OCR=4, the possible existence of the threshold stress ratio under the symmetric cyclic loading is confirmed. The value of the threshold stress ratio is 0.44~0.48. At the early stage of cyclic loading, the evolutions of axial strain and pore pressure are similar to the results of the conventional cyclic tests. However, as the number of cycles increases, the cyclic axial strain decreases, whereas the permanent axial strain increases and the pore pressure decreases from a positive to negative value. These new phenomena are analyzed by conducting additional creep tests on the overconsolidated clay, which throws new light on studying the mechanism governing the long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles.
- clay,
- a large number of cycles,
- creep,
- pore pressure,
- undrained triaxial test

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Long-term undrained mechanical behavior of overconsolidated clay under cyclic loading with a large number of cycles

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