含瓦斯煤蠕变实验及理论模型研究

含瓦斯煤蠕变实验及理论模型研究 English Version

基金项目: 国家重点基础研究发展计划(973计划)项目(2005CB221502);;国家自然科学基金重点项目(50534080);;国家自然科学基金项目(50874124,50604021);;重庆市自然科学基金重点项目(CSTC2008BA6028)

1. College of Resources and Environmental Sciences Chongqing Universty Chongqing 400044 China 2. Key Laboratory for Exploitation of Southwest Resources Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400044 China

摘要: 利用自行研制的含瓦斯煤三轴蠕变实验装置,对预制的成型煤样在不同围压和不同瓦斯压力下完成了蠕变实验。基于实验结果,研究了不同应力水平下轴向变形的变化趋势,分析了不同围压下含瓦斯煤的蠕变失稳特征。采用七元件非线性黏弹塑性河海蠕变模型对实验结果进行了分析,得到了含瓦斯煤的蠕变材料参数。实验结果与该模型的理论值吻合较好,表明河海模型能正确描述含瓦斯煤的蠕变本构特性。
- 含瓦斯煤 /
- 蠕变 /
- 河海模型
Abstract: By use of the triaxial creep loading device for gas-containing coal developed by the authors, a creep experiment is carried out. According to the experimental results, the variation of axial deformation under different stress states is studied, and the creep failure characteristics of gas-containing coal under different confining pressures are analyzed. The experimental results are analyzed by the seven-component nonlinear viscoelasto-plastic creep model (Hohai model), and the creep materail parameters are attained. It is indicated that creep constitutive relation of gas-comtaining coal can be expressed by the nonlinear viscoelasto-plastic creep model correctly.
- gas-containing coal /
- creep /
- Hohai model