Abstract
The Poynting-Thomson creep model is one of the classical combined creep models; however, it fails to demonstrate the plastic creep and the accelerated creep stage, which limit the popularization and the use of the model. The New Poynting-Thomson (NP-T) creep model is established to enhance the existing Poynting-Thomson creep model by the damage theory and the viscoplastic unit in this paper. On the basis of deducing its constitutive equation in three-dimensional finite difference form, The NP-T creep model is secondarily developed by using Visual C ++ language and FLAC3D built-in FISH language. The results of a parameter inversion indicate the superiority of the NP-T creep model that can be applied in non-uniform stress field. After validating its accuracy by the FLAC3D software, the NP-T creep model is used in a numerical simulation to reflect that the roadway stability is gradually weakened with the increase of the surrounding soft rock thickness.
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Acknowledgements
This work is financially supported by the National Natural Science Foundation of China (nos. 41372244, 41172216, 41373095) and the Anhui Science and Technology Research Project of China (no. 1501zc04048). The authors would like to express sincere thanks to the reviewers for their thorough reviews and useful suggestions.
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Chen, L., Li, S., Zhang, K. et al. Secondary development and application of the NP-T creep model based on FLAC3D . Arab J Geosci 10, 508 (2017). https://doi.org/10.1007/s12517-017-3301-9
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DOI: https://doi.org/10.1007/s12517-017-3301-9