改进西原模型的三维蠕变本构方程及其参数辨识

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Abstract The classical Nishihara model is composed of the Hooke body，viscoelastic body and viscoplastic body，which can hardly describe the rheological feature of nonlinear accelerating creep of rocks. By connecting a nonlinear viscous dashpot with a strain trigger and the classical Nishihara model in series，a modified Nishihara model is obtained and a 3D creep constitutive equation for rocks under constant stress is deduced. Through fitting with a rheological curve from experiments on red sandstones from Wanzhou in the Three Gorges reservoir area，parameters of the modified Nishihara model are derived. Comparison between the actual experimental data and the fitting curve of the modified Nishihara model shows that not only an adequate reflection of primary and steady creep stages，but also a well depiction of accelerating creep stage can be obtained. Accelerating creep is a key stage for landslides forecast. So success of the modified Nishihara model in representing this stage contributes greatly to landslide forecasting.

Key words： rock mechanics rheology Nishihara model accelerating creep model parameters

Received: 22 April 2011

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http://www.rockmech.org/EN/Y2012/V31/I2/347

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