摘要
为探究红砂岩在酸蚀作用下的蠕变特性,根据损伤力学理论,将红砂岩中氧化钙在单位时间内的损失量作为化学损伤的依据;通过化学动力学中的表观反应速率理论,考虑浸泡红砂岩的化学溶液初始pH值和浸泡时间,推导出氧化钙损失量随时间变化的表达式,从而实现化学损伤因子的定量化。针对红砂岩在蠕变过程中的应力损伤,提出了应力损伤演化方程及加速蠕变时间阈值。在传统蠕变本构模型的基础上串并联基本元件,并将化学损伤因子与应力损伤因子引入蠕变本构模型中,建立了酸蚀作用下红砂岩的非线性蠕变损伤本构模型。最后,通过分析酸性溶液浸泡后红砂岩的三轴压缩蠕变试验数据,对所建模型进行参数辨识及验证,结果表明,本文所提出的蠕变模型能较好地描述红砂岩在酸蚀作用下的蠕变特性,具有一定的合理性与可靠性。
In order to explore the creep characteristics of red sandstone under acid corrosion,according to the theory of damage mechanics,the loss of calcium oxide in red sandstone per unit time is used as the basis for chemical damage;Through the theory of apparent reaction rate in chemical kinetics,considering the initial pH value and soaking time of the chemical solution soaking red sandstone,the expression of calcium oxide loss with time was deduced,so as to realize the quantification of chemical damage factor.Aiming at the stress damage of red sandstone during the creep process,the stress damage evolution equation and the accelerated creep time threshold are proposed.On the basis of the traditional creep constitutive model,the basic elements are connected in series and parallel,and the chemical damage factor and stress damage factor are introduced into the creep constitutive model,and the nonlinear creep damage constitutive model of red sandstone under acid corrosion is established.Finally,by analyzing the triaxial compression creep test data of red sandstone soaked in acid solution,the parameters of the model built in this paper are identified and verified.The creep characteristics under the following conditions have certain rationality and reliability.
作者
胡斌
陈怡昕
张真
李京
魏二剑
HU Bin;CHEN Yixin;ZHANG Zhen;LI Jing;WEI Erjian(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2023年第6期13-18,共6页
Metal Mine
基金
国家自然科学基金项目(编号:U1802243,41672317)
湖北省技术创新专项(重大项目)(编号:2017ACA184)
武汉科技大学重大科技项目培育类创新团队(A类)(编号:2018TDX01)。
关键词
酸蚀作用
化学损伤
应力损伤
蠕变本构模型
参数辨识
acid etching
chemical damage
stress damage
creep constitutive model
parameter identification
