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Dynamic Model of Fracture Normal Behaviour and Application to Prediction of Stress Wave Attenuation Across Fractures

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Summary.

The purpose of this paper is to establish a dynamic constitutive model of fracture normal behaviour, based on laboratory tests of artificial fractures cast by cement mortar. A series of tests are systematically carried out under quasi-static (10−1 MPa/s) up to highly dynamic (103 MPa/s) monotonic loading conditions. The normal stress-fracture closure response is measured at different loading rates. Based on the measured curves, a nonlinear (hyperbolic) dynamic model of fracture normal behaviour, termed as dynamic BB model, is proposed. The dynamic model is modified from the existing BB model of static normal behaviour of fractures by taking into account the loading-rate effect. Two important dynamic parameters of fractures, FSC d (dynamic fracture stiffness constant, which describes the incremental ratio of dynamic initial stiffness) and FCC d (dynamic fracture closure constant, which describes the decremental ratio of dynamic maximum allowable closure), are identified. They indicate the quantitative degree of loading-rate effect on fracture normal behaviour subjected to dynamic loads. For practical application, the new model is incorporated into the Universal Distinct Element Code (UDEC) and subsequently, UDEC modelling of normally incident P-wave transmission across single fractures with the dynamic BB model is conducted. Wave transmission coefficient is obtained for various combinations of fracture dynamic parameters, as well as different wave amplitudes and frequencies. The numerical results show that wave transmission coefficient for a fracture with the dynamic BB model is greater than that for a fracture with the static BB model. In addition, a fracture with higher values of FSC d and FCC d leads to higher transmission (lower attenuation).

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Authors and Affiliations

  1. Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory, Lausanne, Switzerland

    J. Zhao

  2. Tritech Consultants Pte Ltd, 2 Kaki Bukit Place, Tritech Building, Singapore

    J. G. Cai

  3. Department of Earth Science, Nanjing University, Nanjing, Jiangsu Province, P.R. China

    X. B. Zhao

  4. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China

    H. B. Li

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  1. J. Zhao
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  2. J. G. Cai
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  3. X. B. Zhao
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Author’s address: J. Zhao, Ecole Polytechnique Federale de Lausanne (EPFL), Rock Mechanics Laboratory, 1015 Lausanne, Switzerland

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Zhao, J., Cai, J., Zhao, X. et al. Dynamic Model of Fracture Normal Behaviour and Application to Prediction of Stress Wave Attenuation Across Fractures. Rock Mech Rock Eng 41, 671–693 (2008). https://doi.org/10.1007/s00603-006-0127-2

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  • DOI: https://doi.org/10.1007/s00603-006-0127-2

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