《三轴压缩下含瓦斯煤岩弹塑性损伤耦合本构模型》.docVIP

三轴压缩下含瓦斯煤岩弹塑性损伤耦合本构模型 王登科1，尹光志1,2，王俯标1，秦虎1 (1. 重庆大学 资源及环境科学学院,重庆400044; 2. 重庆大学 西南资源开发及环境灾害控制工程教育部重点实验室, 重庆400044) 摘 要：通过引入与塑性屈服准则相关联的各向异性损伤因子和损伤准则来描述含瓦斯煤岩的塑性变形及损伤演化过程。在多孔介质有效应力原理中引入瓦斯吸附的膨胀应力，得出了适用于含瓦斯煤岩的有效应力计算公式。利用不可逆热力学原理，对含瓦斯煤岩的损伤演化规律及塑性变形与损伤之间的耦合效应进行了有效描述。根据实验结果，采用非关联塑性流动法则，建立了能反映各种应力条件下力学行为的含瓦斯煤岩弹塑性损伤耦合本构模型，并给出了本构模型的参数确定方法。通过理论结果与实验结果的比较，可以发现所提出的弹塑性损伤耦合本构模型能真实有效地描述含瓦斯煤岩在不同应力条件下的力学特性。 关键词：三轴压缩；各向异性损伤；弹塑性本构模型；多孔介质；含瓦斯煤岩 分类号 文献标识码 A 作者简介：王登科(1980–)男，湖南祁阳人，重庆大学博士研究生，主要矿业工程与岩石力学研究。Email：wangdengke99@ An elastoplatic damage coupled model for gas-saturated coal under triaxial compression WANG Deng-ke1 YIN Guang-zhi1,2, WANG Fu-biao1,QIN Hu1 (1.College of Resource and Environmental Sciences, Chongqing University, Chongqing 400044 China;2.Key Laboratory for the Exploitation of Southwest Resources and the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China) Abstract: Anisotropic damage with a plasticity yield criterion and a damage criterion are introduced to be able to adequately describe the plastic and damage behavior of gas-saturated coal. The swell stress of gas adsorption is introduced into the effective stress principle of porous media, and the effective stress formulation for gas-saturated coal is derived. Damage evolution law and the coupling between plastic deformation and damage are represented by using the framework of irreversible thermodynamics. On the basis of the experimental results, a general coupled elastoplastic damage constitutive model is developed for the mechanical responses of gas-saturated coal under various loading conditions by adopting a non-associated plastic flow rule. The method for determining the parameters of the constitutive model is discussed. Comparisons between simulation values and experimental data are performed for various stress states. It shows that the proposed model is able to effectively depict the main features of mechanical behavior observed in