To describe the creep characteristics of rocks under hydration freeze-thaw coupling conditions,uniaxial compression creep and nuclear magnetic resonance tests were conducted on marble under acidic,alkaline,neutral solutions and different freeze-thaw cycle conditions.T2 spectrum distribution and creep test results were analyzed,and coupled damage evolution was carried out.Finally,a new creep damage constitutive model considering the coupling of hydration freeze-thaw and stress was obtained.The results show that:1)The T2 spectrum of marble exhibits three peaks,and pore in the rock is mainly composed of large size pores.2)The freeze-thaw cycle promotes the development of pores in marble,and the influence degree of different solution environments on pore development from high to lower is acidic,alkaline,and neutral.3)The hydration freeze-thaw and load damage variables were constructed to establish a new creep damage constitutive model of marble under the coupling conditions of hydration freeze-thaw.4)The average R2of 50 freeze-thaw cycles of three different solutions of marble simulated by a new model is 0.985 4,while the average R of the basic model is only 0.919 4.
关键词
水化-冻融/大理岩/核磁共振/蠕变/损伤/本构模型
Key words
hydration freezing-thaw/marble/nuclear magnetic resonance/creep/injury/constitutive model
维普
万方数据