低渗煤样全应力应变过程渗透特性试验  

Experiment on Permeability Properties of Coal Samples With Low Permeability in Complete Stress-strain Process

作　　者：李树刚[1] 丁洋[1] 张天军[2] 徐刚[1] 王琳华[1] 

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学理学院,陕西西安710054

出　　处：《煤矿安全》2013年第6期5-8,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51174157;51174158)

摘　　要：采用MTS815.02型岩石伺服试验系统对煤样进行了应力应变全过程渗透性试验,得到不同围压下煤样的全应力-应变曲线,探讨了全应力-应变过程中煤样渗透率-应变关系曲线的几何特性,研究了煤样变形和破坏过程中的轴向应变与渗透率之间的关系,分析围压对煤样渗透率变化的影响。结果表明,轴向应力对Darcy流渗透特性和非Darcy流渗透特性的影响是同步的,煤样渗透率的峰值滞后于应力应变峰值;随着围压增大,煤样的渗透率总体上呈下降趋势。Permeable experiments on complete stress - strain process of coal samples were carried out with MTS815.02 rock servo test system. The complete stress - strain curves under different confining pressures were obtained. Then, the geometric features of permeability - strain curves of coal samples in complete stress - strain process were discussed. The relation between axial stress and permea- bility of coal samples during the course of deformation and failure was studied. The effects of confining pressure on the permeability of coal samples were also analyzed. The results showed that the effects of axial stress on Darcy flow permeability properties and non - Darcy flow permeability properties were synchronous. The peak value of permeability of coal samples lagged behind the peak value of the stress - strain. As the confining pressure increased, the permeability of coal samples presented the downward trend in general.

关 键 词：低渗煤样 全应力-应变过程 渗透率 轴压 围压 

分 类 号：TD32[矿业工程—矿井建设]