动力扰动效应影响下软岩蠕变损伤模型研究
Study on creep damage model of soft rock under the influence of dynamic disturbance effect
王泽祺 1胡斌 1李京 1陈魁奎 2魏二剑 1马利遥1
作者信息
- 1. 武汉科技大学资源与环境工程学院,湖北武汉 430081
- 2. 大同大学煤炭工程学院,山西大同 037009
- 折叠
摘要
动力扰动效应严重影响着边坡工程和地下岩土工程的安全稳定性,为描述动力扰动效应影响下软岩蠕变损伤变形的演化规律,基于动力扰动效应影响下软岩蠕变损伤过程中黏度系数的演化规律,采用新型协同损伤计算方法,实现蠕变损伤各阶段黏度系数演化的定量化表达.基于协同损伤效应影响下软岩蠕变各阶段黏度系数的新型演化方程和改进的牛顿体元件,采用元件模型的方法,建立软岩一维蠕变损伤模型.在此基础上,引入塑性流动法则,建立协同损伤效应影响下软岩的三维蠕变损伤模型.依据动力扰动效应影响下软岩的蠕变试验数据,采用Levenberg-Marquardt优化算法,验证所建一维和三维蠕变损伤模型的正确性,并确定模型参数.结果表明:所建一维和三维蠕变损伤模型均能较好地描述动力扰动效应影响下软岩的时变变形,尤其是加速蠕变阶段.并对蠕变损伤模型的关键参数进行了敏感性分析,详细分析所建蠕变损伤模型的正确性和适用范围.
Abstract
The dynamic disturbance effect has a major effect on the stability and safety of subsurface geotechnical engineering and slope engineering.In order to account for the effects of dynamic disturbance on creep damage to soft rock,this research presents a novel synergistic damage calculation approach based on the evolution law of viscosity coefficient.In order to characterize the evolution law of creep damage and deformation of soft rock under the influence of dynamic disturbance effect,it accomplishes the quantified expression of the evolution of viscosity coefficient at each stage of creep damage.A one-dimensional creep damage model of soft rock was constructed using the element model approach,based on the unique evolution equation of viscosity coefficient in each stage of soft rock creep under the influence of synergistic damage effect and the enhanced Newtonian body element.Building a three-dimensional creep damage model of soft rock under the influence of the synergistic damage effect,the plastic flow rule was presented on this basis.The suggested one-dimensional and three-dimensional creep damage models were verified for accuracy using the Levenberg-Marquardt optimization algorithm,and the model parameters were set using the soft rock creep test results under the influence of the dynamic disturbance effect.The findings showed that the accelerated creep phase in particular,in the one-and three-dimensional creep damage models,may better represent the time-varying deformation of soft rock brought on by dynamic disturbance effects.The correctness and applicability of the suggested creep damage models were carefully evaluated and examined,and a sensitivity analysis of the important creep damage model parameters was also carried out.
关键词
岩石力学/动力扰动/协同损伤/本构模型/蠕变损伤/黏弹塑性Key words
rock mechanics/dynamic disturbance/synergistic damage/constitutive model/creep damage/visco-elasticity plasticity引用本文复制引用
基金项目
国家自然科学基金资助项目(U1802243)
国家自然科学基金资助项目(41672317)
湖北省技术创新重大专项(2017ACA184)
出版年
2024
NETL
NSTL
万方数据