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时间效应下泥岩浸水膨胀本构模型研究 被引量:1

Study on Constitutive Model of Immersed Mudstone Swelling Under Time Effect
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摘要 基于流变力学理论对时间效应下的泥岩浸水膨胀进行研究,利用流变力学理论推导得到时间效应下的膨胀本构模型,以侧限条件下的泥岩自由膨胀试验为基础对模型进行验证,并给出模型中各参数的物理意义。研究结果表明:泥岩浸水初始阶段膨胀速率快,随着时间的推移速率变慢,最终膨胀稳定;泥岩浸水膨胀产生的最终应变由膨胀力和渐进膨胀弹性模量决定;时间效应下膨胀模型能够较好地描述和预测泥岩浸水膨胀时间规律;引入时间效应下膨胀模型能将Einstein的三维静态稳定本构关系推广为非稳定动态三维本构关系。 Based on the theory of rheological mechanics,the mudstone swelling under the time effect was studied,and the swelling constitutive model under the time effect was derived by the theory of rheology.The model was verified based on the free swelling test of mudstone under confined condition,and the physical significance of each parameter in the model was given.The results show that the swelling rate of mudstone is fast in the initial stage of water immersion,and slows down with the passage of time,and the final swelling is stable.The ultimate strain of mudstone caused by water swelling is determined by swelling force and the elastic modulus of gradual swelling.Under the time effect,the swelling constitutive model can better describe and predict the time-dependent mudstone swelling.By introducing time effect into this swelling constitutive model,the Einstein’s three-dimensional static stable constitutive relation can be extended to unsteady dynamic three-dimensional constitutive relation.
作者 刘景宇 LIU Jingyu(Railway Engineering Research Insitute,China Academy of Railway Science Corporation Limited,Beijing 100081,China)
出处 《铁道建筑》 北大核心 2021年第6期94-98,共5页 Railway Engineering
基金 国家自然科学基金(41801055)。
关键词 泥岩 膨胀本构模型 理论分析 膨胀力 膨胀变形 时间效应 mudstone swelling constitutive model theoretical analysis swelling force swelling deformation time effect
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