基于Poyting-Thomson的岩石黏弹塑性时效损伤蠕变研究  

Creep of rock viscoelastic plastic aging damage based on Poyting-Thomson

作　　者：姚梦圆 董春亮 郝建平[1] 谢雅 YAO Meng-yuan;DONG Chun-liang;HAO Jian-ping;XIE Ya(School of Civil Engineering&Architecture,Anhui University of Science&Technology,Huainan 232001,China;Key Laboratory of Safety&High-efficiency Coal Mining of the Ministry of Education,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育重点实验室,安徽淮南232001

出　　处：《河南城建学院学报》2024年第6期25-34,共10页Journal of Henan University of Urban Construction

基　　金：国家自然科学基金项目(52074006,51404011)。

摘　　要：为准确描述岩石蠕变过程中应变的非线性变化和高应力作用下岩石内部的时效损伤,基于元件模型理论和损伤力学理论,将改进后Poyting-Thomson模型和村山体模型与牛顿体串联,构建了一种能够准确描述岩石蠕变全过程的黏弹塑性时效损伤模型,验证了改进后模型的合理性和适用性,探讨了弹性系数、黏性系数与应力之间的变化规律。结果表明,改进后模型与蠕变过程试验数据拟合的相关系数均大于0.96;在单向应力状态下,弹性系数随轴压增大呈非线性增大,黏性系数随轴压增大呈非线性衰减;在三向应力状态下,弹性系数和黏性系数受围压和轴压共同作用,随轴压增大呈非线性变化。构建的黏弹塑性时效损伤模型完全适用于岩石的单轴和三轴蠕变过程分析。To accurately describe the nonlinear changes in strain during the rock creep process and the time-dependent damage within rocks under high stress,based on the element model theory and damage mechanics theory,an improved Poyting-Thomson model and Murayama body model were combined in series with a Newtonian body to construct a viscoelastic-plastic time-dependent damage creep model that can accurately describe the entire process of rock creep.The rationality and applicability of the improved model were verified,and the variation laws of elastic coefficient,viscosity coefficient,and stress were discussed.The results show that the correlation coefficients between the improved model and the creep process experimental data are all greater than 0.96;under the uniaxial stress condition,the elastic coefficient exhibits a nonlinear increase with increasing axial pressure,while the viscosity coefficient exhibits a nonlinear decay;under triaxial stress conditions,both the elastic coefficient and viscosity coefficient are affected by confining pressure and axial pressure,exhibiting nonlinear changes with increasing axial pressure.This indicates that the constructed viscoelastic-plastic time-dependent damage model is fully applicable to the analysis of the uniaxial and triaxial creep processes of rocks.

关 键 词：蠕变过程 损伤力学 蠕变模型 弹性系数 黏性系数 

分 类 号：TU45[建筑科学—岩土工程]