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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,建立了能反映含瓦斯煤岩在各种应力条件下力学行为的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。通过理论与实验的比较可知: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。
The plastic deformation and damage evolution of gas-bearing coal-bearing rocks are described by introducing anisotropic damage factors and damage criteria associated with the plastic yield criterion. Adopting the expansive stress of gas adsorption in the effective stress principle of porous media, the effective stress formula suitable for gas-bearing coal and rock is obtained. Using the irreversible thermodynamics principle, the damage evolution of coal and rock containing gas and the coupling effect between plastic deformation and damage are effectively described. According to the experimental results, an elasto-plastic damage coupling constitutive model that can reflect the mechanical behavior of gas-bearing coal-bearing rocks under various stress conditions is established by using the non-associated plastic flow rule. The parameter determination method of the constitutive model is also given. Through the comparison of theory and experiment, it can be seen that the proposed elastic-plastic damage coupling constitutive model can describe the mechanical properties of gas-bearing coal-rock under different stress conditions effectively and effectively.