文章摘要
含瓦斯煤体内多场耦合及损伤断裂机理
Multi-field coupling effect on the coal body containing gas and the research of damage fracture mechanism
  
DOI:
中文关键词: 瓦斯场  应力场  裂隙场  损伤  耦合  损伤变量
英文关键词: gas field  stress field  fissure field  damage  coupling  damage variable
基金项目:国家自然科学基金(51174158,51174157,51104118); 教育部高校博士点基金(20096121110002)
作者单位
张天军,崔巍,马锐 西安科技大学 理学院,陕西 西安 710054 
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中文摘要:
      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.
英文摘要:
      In order to reveal the internal stress field of coal containing gas - gas field - fissure field three field coupled relationship between the damage and fracture mechanism. The elastic mechanics, damage mechanics and gas seepage theory were used, the damage variable were established for description of coal body in effective stress field change of fissure field, at the same time the damage variables on the in vivo effect of the porosity of coal and coal mass injury after effective stress equation were presented. According to the construction of coupling equation, the coal stress field - gas field and the role of fissures field coupling under slight deformation of the coal body affected the macroscopic properties of the coal, the distribution of gas pressure were given in the body in different injury cases coal. A multi-field coupling effect the coal body micro damage accumulation was induced coal development through cross-scale nonlinear cascade macro cataclysm. And then, from the point of view of energy, the coal containing gas body injury fracture criterion was given.
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