红砂岩三向应力状态下渗透性能的实验研究  

Laboratory Study of Permeability of Red Sandstone under Three-Dimensional Stress

作　　者：刘彩平[1] 段庆全[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京10083 [2]中国石油大学(北京)机电工程学院,北京102249

出　　处：《矿业研究与开发》2009年第3期9-11,29,共4页Mining Research and Development

基　　金：教育部博士点新教师基金项目(20070008014)

摘　　要：通过试验定量研究和分析了红砂岩三向受压变形破坏全过程的渗透性变化。实验结果表明,剪胀在破坏前发生,开始出现的应力为抗压强度的46%;随着纵向压缩应力的增加渗透流率减低,当达到峰值应力时渗透率降到最低值并保持稳定;渗透率受围压和渗透压差的影响显著,围压越高,渗透率的降低速度越低;渗透压差越大,渗透率越小,且下降的速率越大。By tests, the quantitative study and analysis were made on the permeability changes of red sandstone in complete deformation and failure process under three - dimensional stress. The results shown that the shear - induced dilataney occurred early prior to the final failure, the onset stress of dilataney was approximate 46% of the ultimate compressive strength of the red sandstone. The permeability in the red sandstone decreased continuously with the increment of the longitudinal compressive stress, the permeability arrived at the lowest value and kept constant as soon as the peak stress was reached. The confining pressures and penetrative pressure difference has notable effects on the permeability of the red sandstone, the higher confining pressure lead to the lower decreasing velocity of the permeability, the higher penetrative pressure difference induced the lower permeability and the higher decreasing velocity of the permeability.

关 键 词：渗透率 三向受压 红砂岩 液压伺服试验 

分 类 号：TD311[矿业工程—矿井建设]