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为了揭示含瓦斯煤体内应力场-瓦斯场-裂隙场三场之间的耦合关系及其损伤断裂机理.运用弹性力学、损伤力学及瓦斯渗流理论,通过建立损伤变量,描述煤体在有效应力作用下裂隙场的变化,同时给出损伤变量对煤体内孔隙率的影响以及煤体受损伤后有效应力的变化方程;根据所建耦合方程,考虑煤体在应力场-瓦斯场-裂隙场耦合作用下煤体内的微小变形对煤体宏观性能的影响,给出了不同损伤情况下煤体内瓦斯压力的分布规律.揭示了多场耦合作用下煤体内大量微损伤积累通过跨尺度的非线性串级发展而诱发煤体的宏观灾变,并从能量角度给出了含瓦斯煤体的损伤断裂准则.
In order to reveal the coupling relationship between the three fields of stress field-gas field-fracturing field and the mechanism of damage and fracture in the coal-bearing gas, by using elastic mechanics, damage mechanics and gas seepage theory, the damage variables are described to describe the effect of coal on effective stress The influence of the damage variable on the porosity of the coal body and the change equation of the effective stress after the coal body damage are given. According to the coupled equation, the coupling effect of the coal body in the stress field-gas field-fracture field is considered The influence of small deformation in the coal body on the macroscopic performance of the coal is given.The distribution of the gas pressure in the coal body under different damage conditions is given.It is revealed that the accumulation of a large number of micro- Development and induced macroscopic catastrophe, and from the energy point of view gives the damage and fracture criterion of gas containing coal.