冲击地压形成过程中能量耗散特征研究  

Investigation on the characteristics of energy dissipation in the preparation process of coal bumps

作　　者：赵毅鑫[1,2] 姜耀东[1,2] 田素鹏[1,2] 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭学报》2010年第12期1979-1983,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2010CB226804);国家自然科学基金资助项目(50704034);中央高校基本科研业务专项资金项目;煤炭资源与安全开采国家重点实验室自主课题资助项目

摘　　要：在非平衡热力学和耗散结构理论的基础上,研究了冲击地压孕育过程中"煤-围岩"系统能量耗散特征和系统内熵的变化,初步建立了基于非平衡态热力学的冲击地压失稳判断方法;采用X射线衍射、顺磁共振、扫描电镜、显微组分测定等实验手段,获得了冲击地压发生前后煤岩样的细观结构差异,探求了冲击地压孕育、发生过程中能量耗散细观特征。研究发现:冲击地压是煤岩体内能量的涨落达到一定值后出现的自组织现象,其孕育过程是煤岩储能和耗能竞争的过程,该过程中强烈的挤压和剪切力加强了煤微元环缩合作用和拼叠作用,使煤超前演化,并促使煤岩内宏观裂纹非稳定扩展,加速了能量耗散的物理和化学的不可逆过程。Based on the theory of the non-equilibrium thermodynamic and energy dissipation assumptions,the energy conservation and dissipation process of the ＂coal-surrounding rock＂ system was analyzed.The variety of the system entropy and the development of the dissipation structure in the coal seam were studied.Furthermore,the method adopted to evaluate the stability of the system was developed.Based on the XRD,EPR,SEM tests and petrology analysis,the variation of the coal microstructures before and after the coal bumps was discussed.Investigation results show that the coal bumps will begin as the fluctuation of strain energy reaches a threshold,which is satisfied with the minimum entropy principle.Coal bump is a kind of self-organized phenomenon.In the preparation process of coal bumps,the coal rank will be increased by concentrated compressive and shearing stress and associated chemical and physical processes will occur.

关 键 词：冲击地压 能量耗散 非平衡热力学 细观结构 

分 类 号：TD324.1[矿业工程—矿井建设]