基于能量自我抑制模型理论的岩石损伤模型研究  

Rock Damage Model Study Based on Energy Self-inhibition Model Theory

作　　者：吕洪淼 LÜHong-miao(School of Civil Engineering,Eastern Liaoning University,Dandong,Liaoning 118003,China)

机构地区：[1]辽东学院土木工程系,辽宁丹东118003

出　　处：《公路交通科技》2024年第10期184-191,214,共9页Journal of Highway and Transportation Research and Development

基　　金：辽东学院校级博士科研启动基金项目(2021BS011);辽宁省科技计划联合计划(应用基础研究项目)(2023JH2/101700003)。

摘　　要：为建立更具普适性、更接近岩石变形破坏本质的应力-应变关系和能量演化规律,基于能量自我抑制模型理论建立了描述岩石应力-应变关系的本构模型,以及建立了岩石破坏的能量非线性演化模型。以辽宁某煤矿砂岩为研究对象,采用MTS815.03试验系统对围岩开展不同围压作用下的力学特性试验,分析围压对能量演化规律的影响。从热力学能量演化角度出发,通过采用能量自我抑制模型的理论建立了岩石应变-弹性能的本构模型,并通过能量微分对能量模型中的应变求导得到可描述岩石应力-应变关系的本构模型。结果表明:围压可以有效地提升岩石的能量储存和耗散。演化模型计算值和应力-应变关系本构计算值都与试验值有着良好的吻合度,且计算值与试验值的相关性系数均在0.95以上,说明建立的模型可以较好地反映岩石破坏过程中的能量演化规律和应力-应变关系。在模型中引入的等效参数具有明显的物理参数意义,能较好地反映岩石能量的演化规律,提供了一个可以通过模型参数值来判断岩石能量变化趋势的方法,这对实际围岩的变形支护具有指导意义,进而更好地分析和预测岩石能量变化规律和应力-应变规律。To establish a more universal stress-strain relation and energy evolution rule closer to the essence of rock deformation and failure,the constitutive model,describing the rock stress-strain relation,was established based on the energy self-inhibition model theory.The energy nonlinear evolution model of rock failure was established.Taking the coal mine sandstone in Liaoning province as the study object,the MTS815.03 test system was used to carry out the mechanical property test on surrounding rock under different confining pressures;and the influence of confining pressure on the energy evolution rule was analyzed.From the perspective of thermodynamic energy evolution,the constitutive model of rock strain-elastic energy was established by using the energy self-inhibition model theory.By applying the energy differentials,the strain with energy model was derived to develop the constitutive model,accurately describing the rock stress-strain relation.The result indicates that the confining pressure can effectively improve the energy storage and dissipation of rock.The calculated values with evolution model and the stress-strain relation constitutive calculated values are in good agreement with the test values;the correlation coefficients between calculated values and test values are all above 0.95.It shows that the established model can better reflect the energy evolution rule and stress-strain relation in the rock failure process.The equivalent parameters introduced in the model have obvious physical parameter significance.It can better reflect the rock energy evolution rule,providing the method to assess the rock energy variation trends through the model parameter values,and offering the practical guidance for surrounding rock deformation and support.The proposed approach enhances the analysis and prediction on rock energy evolution and corresponding stress-strain behavior.

关 键 词：隧道工程 能量演化 岩石损伤 能量自我抑制模型 力学特性 应力-应变 围压 

分 类 号：U452[建筑科学—桥梁与隧道工程]