###
工程科学与技术:2021,53(1):104-112
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
蠕变参数劣化的时效性及变参数蠕变模型
(1.辽宁工程技术大学 土木工程学院,辽宁 阜新 123000;2.桂林理工大学 土木与建筑工程学院,广西 桂林 541004;3.广西岩土力学与工程重点实验室,广西 桂林 541004)
Time-dependentness of Creep Parameter Degradation and Variable Parameter Creep Model
(1.School of Civil Eng., Liaoning Technical Univ., Fuxin 123000, China;2.School of Civil and Architectural Eng., Guilin Univ. of Technol., Guilin 541004, China;3.Guangxi Key Lab. of Geomechanics and Geotechnical Eng., Guilin 541004, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 1333次   下载 630
投稿时间:2019-07-05    修订日期:2019-09-12
中文摘要: 为研究深部岩石在复杂条件下的蠕变特性,采用MTS812.02试验机对岩石进行三轴蠕变试验。在分析蠕变曲线特征的基础上,结合岩石流变力学和损伤理论,将黏弹塑性损伤元件引入蠕变模型,提出确定蠕变参数的方法,实现对岩石蠕变曲线全过程的描述。结果表明:黏弹塑性损伤元件为描述岩石蠕变曲线全过程提供了一个新思路;改进的模型可考虑过应力差和时间的双重影响,进而得到蠕变参数与过应力差和时间的关系,更好地反映了岩石在蠕变过程中蠕变特性参数随时间和过应力差乘积变化而呈现的损伤劣化特性,进一步揭示了蠕变变形破坏的内在机理,也预测了岩石蠕变参数随时间和应力变化的规律;将蠕变参数拟合公式代入到原有蠕变损伤模型中,建立考虑应力和时间对蠕变参数双重影响的损伤蠕变模型;通过改进黏弹塑性损伤元件的损伤演化方程,更好地反映了岩石在蠕变过程中的损伤程度。此外,通过分析蠕变参数与应力和时间之间的变化关系,提出确定蠕变参数的新方法,得到了蠕变参数的劣化特征,更加明确了蠕变参数的物理意义;通过对比试验结果和模型计算结果,得出模型曲线在高应力状态下和试验曲线具有良好的吻合度,验证了改进的蠕变模型的正确性和蠕变参数确定方法的合理性。
Abstract:In order to better study the creep properties of rocks under different conditions, the rock triaxial creep tests were conducted using the MTS812.02 test system. Based on the rock rheological mechanics, damage theory and the characteristic analysis of the creep curves, the viscoelastic-plastic damage element was introduced into the creep model, and a new method for determining the creep parameters was proposed. The whole process description of rock creep curve was realized. The results showed that the viscoelastic-plastic damage element provided a new idea for describing the whole process of rock creep curve. The improved model can consider the dual effects of over-stress difference and time, and then obtain the relationship between creep parameters and over-stress difference and time. The damage degradation characteristics of the creep property parameters of rock during the creep process with time and over-stress difference were all reflected. This further revealed the internal mechanism of creep deformation damage, and also predicted the variation of rock creep parameters with time and stress. The creep parameter fitting formula was substituted into the original creep damage model, and the damage creep model considering the dual influences of stress and time on the creep parameters was established. At the same time, by improving the damage evolution equation of the viscoelastic-plastic damage component, the damage degree of the rock during the creep process can be better reflected. The relationships between creep parameters and stress and time were analyzed. A new method for determining creep parameters was proposed. The degradation characteristics of creep parameters were obtained, and the physical meanings of creep parameters were more clearly defined. By comparing the experimental results with the model calculation results, it was concluded that the model curve had a good agreement with the test curve under high stress state. The correctness of the improved creep model and the rationality of the creep parameter determination method were also verified.
文章编号:201900672     中图分类号:TU451    文献标志码:
基金项目:国家自然科学基金项目(51274109)
作者简介:第一作者:刘文博(1990-),男,讲师,博士.研究方向:地下工程与岩石本构模型.E-mail:15393162288@163.com;通信作者:张树光,E-mail:zhangshuguang168@163.com
引用文本:
刘文博,张树光,孙博一.蠕变参数劣化的时效性及变参数蠕变模型[J].工程科学与技术,2021,53(1):104-112.
LIU Wenbo,ZHANG Shuguang,SUN Boyi.Time-dependentness of Creep Parameter Degradation and Variable Parameter Creep Model[J].Advanced Engineering Sciences,2021,53(1):104-112.