首页|Creep constitutive model considering nonlinear creep degradation of fractured rock
Creep constitutive model considering nonlinear creep degradation of fractured rock
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Stability analysis of underground constructions requires a model study of rock masses'long-term perfor-mance.Creep tests under different stress conditions was conducted on intact granite and granite samples fractured at 30° and 45° angles.The experimental results indicate that the steady creep strain rates of intact and fractured rock present an exponential increase trend with the increase of stress level.A non-linear creep model is developed based on the experimental results,in which the initial damage caused by fracture together with the damage caused by constant load have been taken into consideration.The fit-ting analysis results indicated that the model proposed is more accurate at identifying the full creep regions in fractured granite,especially the accelerated stage of creep deformation.The least-square fit error of the proposed creep model is significantly lower than that of Nishihara model by almost an order of magnitude.An analysis of the effects of elastic modulus,viscosity coefficient,and damage factors on fractured rock strain rate and creep strain is conducted.If no consideration is given to the effects of the damage,the proposed nonlinear creep model can degenerate into to the classical Nishihara model.
Wang Chunping、Liu Jianfeng、Chen Liang、Liu Jian、Wang Lu、Liao Yilin
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Beijing Research Institute of Uranium Geology,Beijing 100029,China
CAEA Innovation Center for Geological Disposal of High-Level Radioactive Waste,Beijing 100029,China
State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China
School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China
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National Natural Science Foundation of Chinatechnological research projects in Sichuan ProvinceChina Atomic Energy Authority(CAEA)through the Geological Disposal Program
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