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Study on Improved Nonlinear Viscoelastic-Plastic Creep Model Based on the Nishihara Model
Abstract The description of rock creep by existing rheological models mainly focuses on the first two stages of creep. However, the description of the accelerated creep stage is rare, which is contrary to the common study of soft rock failure in engineering applications. Therefore, the study of the accelerated creep stage is an important research direction at present. In this paper, a new model that can describe accelerated creep is proposed on the basis of the Nishihara model, and creep constitutive relation of the model is deduced via relevant laws. The parameters of the model are obtained by the whole rheological curves of the sandy mudstone of the diversion tunnel of a hydropower station and the strongly weathered sandstone in the bottom of the Xiangjiaba dam foundation. A fitting analysis of the theoretical results and experimental data indicates that the fitting results are highly consistent; the correlation coefficients are all above 0.98, which shows the rationality and correctness of the model. The nonlinear viscoelastic-plastic model proposed in this paper can accurately describe the accelerated creep stage of rock, and its applicability is obviously broader than that of the traditional Nishihara model. This nonlinear viscoelastic-plastic model can be used to not only predict the critical sliding of a rock mass in slope, tunnel and hydraulic engineering but also enrich the theory of rock rheology.
Study on Improved Nonlinear Viscoelastic-Plastic Creep Model Based on the Nishihara Model
Abstract The description of rock creep by existing rheological models mainly focuses on the first two stages of creep. However, the description of the accelerated creep stage is rare, which is contrary to the common study of soft rock failure in engineering applications. Therefore, the study of the accelerated creep stage is an important research direction at present. In this paper, a new model that can describe accelerated creep is proposed on the basis of the Nishihara model, and creep constitutive relation of the model is deduced via relevant laws. The parameters of the model are obtained by the whole rheological curves of the sandy mudstone of the diversion tunnel of a hydropower station and the strongly weathered sandstone in the bottom of the Xiangjiaba dam foundation. A fitting analysis of the theoretical results and experimental data indicates that the fitting results are highly consistent; the correlation coefficients are all above 0.98, which shows the rationality and correctness of the model. The nonlinear viscoelastic-plastic model proposed in this paper can accurately describe the accelerated creep stage of rock, and its applicability is obviously broader than that of the traditional Nishihara model. This nonlinear viscoelastic-plastic model can be used to not only predict the critical sliding of a rock mass in slope, tunnel and hydraulic engineering but also enrich the theory of rock rheology.
Study on Improved Nonlinear Viscoelastic-Plastic Creep Model Based on the Nishihara Model
Yu, Mingyuan (author) / Liu, Baoguo (author) / Sun, Jinglai (author) / Feng, Wenlin (author) / Wang, Qi (author)
2020
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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