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An elasto-plastic constitutive model incorporating strain softening and dilatancy for interface thin-layer element and its verification

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Abstract

The mechanical behaviors of the interface between coarse-grained soil and concrete were investigated by simple shear tests under condition of mixed soil slurry (bentonite mixed with cement grout). For comparison, the interfaces both without slurry and with bentonite slurry were analyzed. The experimental results show that different slurries exert much influence on the strength and deformation of soil/structure interface. Under mixed soil slurry, strain softening and shear dilatation are observed, while shear dilatation appears under the small normal stress of the interface without slurry, and shear contraction is significant under the condition of the bentonite slurry. The thickness of the interface was determined by analyzing the disturbed height of the sample with both simple shear test and particle flow code (PFC). An elasto-plastic constitutive model incorporating strain softening and dilatancy for thin layer element of interface was formulated in the framework of generalized potential theory. The relation curves of shear stress and shear strain, as well as the relation curves of normal strain and shear strain, were fitted by a piecewise function composed by hyperbolic functions and resembling normal functions. The entire model parameters can be identified by tests. The new model is verified by comparing the measured data of indoor cut-off wall model tests with the predictions from finite element method (FEM). The FEM results indicate that the stress of wall calculated by using Goodman element is too large, and the maximum deviation between the test data and prediction is about 45%. While the prediction from the proposed model is close to the measured data, and the error is generally less than 10%.

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Authors and Affiliations

  1. Hydrochina Zhongnan Engineering Corporation, Changsha, 410014, China

    Kai Peng  (彭凯) & Shu-rong Feng  (冯树荣)

  2. Key Laboratory of Geo-mechanics and Embankment Engineering of Ministry of Education (Hohai University), Nanjing, 210098, China

    Kai Peng  (彭凯), Jun-gao Zhu  (朱俊高), Rong Wang  (王荣) & Han-long Liu  (刘汉龙)

  3. Geotechnical Research Institute, Hohai University, Nanjing, 210098, China

    Kai Peng  (彭凯), Jun-gao Zhu  (朱俊高), Rong Wang  (王荣) & Han-long Liu  (刘汉龙)

Authors
  1. Kai Peng  (彭凯)
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  2. Jun-gao Zhu  (朱俊高)
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  3. Shu-rong Feng  (冯树荣)
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  4. Rong Wang  (王荣)
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  5. Han-long Liu  (刘汉龙)
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Correspondence to Kai Peng  (彭凯).

Additional information

Foundation item: Project(20110094110002) supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China; Project(200801014) supported by the Ministry of Water Resources of China; Project(50825901) supported by the National Natural Science Foundation of China

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Peng, K., Zhu, Jg., Feng, Sr. et al. An elasto-plastic constitutive model incorporating strain softening and dilatancy for interface thin-layer element and its verification. J. Cent. South Univ. 19, 1988–1998 (2012). https://doi.org/10.1007/s11771-012-1236-6

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  • DOI: https://doi.org/10.1007/s11771-012-1236-6

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