Abstract
The research on the rheological mechanical behaviour of swelling rock in the condition of humidity field has a significant meaning for large rock engineering, such as deep coal mining, tunnelling, and slope engineering. Based on the Nishihara model, considering on the effect of humidity factor on swelling rock, the rheological elements are established and the effects of humidity on the damage of rock, the viscosity, and the elasticity are introduced. Moreover, the viscoelastic plasticity constitutive equations are established under the coupling of swelling rock stress and humidity. Afterward, considering the effects of humidity on the damage, elasticity, and viscosity, the creeping, unloading, and relaxation equations have been deduced. From this research, under the state of low stress σ3P<σS, the Nishihara model which considers the effect of humidity shows the properties of stable creeping. In addition, the unloading curves contain instantaneous elasticity, elastic after effect, and the viscosity flow induced by the humidity. However, under the state of high stress σ3P≥σS, it is an unstable creeping model. The unloading curves include instantaneous elasticity, elastic after effect, and the viscosity flow induced by the stress and the humidity. This model reflects the rheological properties of swelling rock comprehensively, and it can be used for rock rheological analysis.
Highlights
Academic Editor: Hailing Kong e research on the rheological mechanical behaviour of swelling rock in the condition of humidity field has a significant meaning for large rock engineering, such as deep coal mining, tunnelling, and slope engineering
Under the state of low stress (σ3P < σS), the Nishihara model which considers the effect of humidity shows the properties of stable creeping
Under the state of high stress (σ3P ≥ σS), it is an unstable creeping model. e unloading curves include instantaneous elasticity, elastic after effect, and the viscosity flow induced by the stress and the humidity. is model reflects the rheological properties of swelling rock comprehensively, and it can be used for rock rheological analysis
Summary
The Research on the Effect of Humidity on the Rheological Model of Swelling Rock. Received 22 June 2020; Revised 10 July 2020; Accepted July 2020; Published August 2020. Based on the Nishihara model in component composition model, this paper introduced the rheological components, which consider the humidity expansion effect, to establish the swelling rock viscoelastic model that considers on the humidity, the damage, and the viscosity. In this paper, based on the Nishihara model, the humidity effect is introduced; as shown in Figure 2, the Nishihara
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