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Attenuation-type and failure-type curve models on accumulated pore water pressure in saturated normal consolidated clay

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Abstract

Based on dynamic triaxial test results of saturated soft clay, similarities of variations between accumulated pore water pressure and accumulated deformation were analyzed. The Parr’s equation on accumulated deformation was modified to create an attenuation-type curve model on accumulated pore water pressure in saturated normal consolidation clay. In this model, dynamic strength was introduced and a new parameter called equivalent dynamic stress level was added. Besides, based on comparative analysis on variations between failure-type and attenuation-type curves, a failure-type curve model was created on accumulated pore water pressure in saturated normal consolidation clay. Two models can take cycle number, coupling of static and dynamic deviator stress, and consolidation way into consideration. The models are verified by test results. The correlation coefficients are more than 0.98 for optimization of test results based on the two models, and there is good agreement between the optimized and test curves, which shows that the two models are suitable to predict variations of accumulated pore water pressure under different loading cases and consolidation ways. In order to improve prediction accuracy, it is suggested that loading cases and consolidation ways should be consistent with in-situ conditions when dynamic triaxial tests are used to determine the constants in the models.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Chun-yan Zhao  (赵春彦)

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  1. Chun-yan Zhao  (赵春彦)
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Correspondence to Chun-yan Zhao  (赵春彦).

Additional information

Foundation item: Project(2009AA11Z101) supported by National High Technology Research and Development Program of China; Project supported by Postdoctoral Science Foundation of Central South University, China; Project(2012QNZT045) supported by Fundamental Research Funds for Central Universities of China; Project(2011CB710601) supported by the National Basic Research Program of China

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Zhao, Cy. Attenuation-type and failure-type curve models on accumulated pore water pressure in saturated normal consolidated clay. J. Cent. South Univ. 19, 2047–2053 (2012). https://doi.org/10.1007/s11771-012-1243-7

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  • DOI: https://doi.org/10.1007/s11771-012-1243-7

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