考虑层理倾角的炭质板岩蠕变损伤本构模型  

Creep damage intrinsic model of carbonaceous slate considering laminar inclination

作　　者：胡涛涛 贺韶君 王栋 HU Taotao;HE Shaojun;WANG Dong(School of Highway,Chang'an University,Xi'an 710064,China;School of Energy and Architectural Engineering,Shandong Huayu Institute of Technology,Dezhou 253034,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]山东华宇工学院能源与建筑工程学院,山东德州253034

出　　处：《浙江大学学报（工学版）》2024年第8期1704-1716,共13页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(52378388);长安大学中央高校基本科研业务费专项资金资助项目(300102213211).

摘　　要：针对层状岩体的各向异性特征,以炭质板岩为研究对象,开展不同层理倾角炭质板岩的蠕变力学试验.基于蠕变试验结果,建立可以描述不同层理倾角炭质板岩加速蠕变的改进Nishihara非线性损伤蠕变本构模型,推导该模型的一维、三维本构方程.研究结果表明,炭质板岩的蠕变过程存在明显的应力阈值.当应力小于阈值时,炭质板岩只发生衰减蠕变;当应力达到或大于阈值时,开始发生稳态蠕变;当应力达到或超过破坏应力时,炭质板岩发生加速蠕变并发生蠕变破坏.模型参数反演辨识结果表明,改进Nishihara蠕变模型能够很好地描述炭质板岩的整个蠕变过程.基于参数辨识结果,对模型参数与围压和层理倾角的关系进行探讨,得到损伤参数c与层理倾角的关系式,分析损伤参数d与黏滞系数对加速蠕变阶段的影响.Carbonaceous slate was taken as the research object and creep mechanical tests were conducted on carbonaceous slate with different bedding dip angles in response to the anisotropic characteristics of layered rock masses.An improved Nishihara nonlinear damage creep constitutive model that can describe the accelerated creep of carbonaceous slate with different bedding angles was established based on the creep test results.The onedimensional and three-dimensional constitutive equations of the model were derived.Results show that there is a significant stress threshold in the creep process of carbonaceous slate.Only attenuation creep occurs in carbonaceous slate when the stress level is less than the threshold.Steady-state creep begins to occur when the stress level reaches or exceeds the threshold.The carbonaceous slate undergoes accelerated creep and creep failure when the stress level reaches or exceeds the failure stress.The inversion identification results of model parameters indicate that the improved Nishihara creep model can effectively describe the entire creep process of carbonaceous slate.The relationship between model parameters and confining pressure and bedding angle was discussed based on the parameter identification results.The relationship between damage parameter c and layer inclination angle was obtained.The effects of damage parameter d and viscosity coefficient to accelerate creep stage were analyzed.

关 键 词：炭质板岩 层理倾角 蠕变特性 本构模型 参数辨识 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]