泥岩非Darcy流渗透特性指标正负号探讨  

Discussion About Positive or Negative Sign of Permeability Indexes in Non-Darcy Flow of Mudstone

作　　者：李天珍[1] 马林[1] 张连英[1] 

机构地区：[1]徐州工程学院土木工程系,江苏徐州221008

出　　处：《采矿与安全工程学报》2007年第4期481-485,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50674087);教育部博士点学科专项基金项目(20060290504);江苏省自然科学基金项目(BK2007029)

摘　　要：Forchheimer关系是非Darcy渗流研究中经常使用的一种经验关系,一般认为非Darcy流β因子和加速度系数这两个渗透特性指标(参量)总是正值.在泥岩和砂质泥岩试样全应力-应变过程的渗透试验中出现其中一个参量为负或者两者均为负值的情况,这究竟是有价值的试验现象,还是测试方法不够合理?指出一些文献在引用Forchheimer关系时出现的非Darcy流β因子前正负号的错误,给出了非Darcy流β因子和加速度系数出现负值的泥岩和砂质泥岩试样全应力-应变过程中渗透特性试验结果,并对其原因进行了粗浅的分析.Forchheimer＇s formula is an experiential relation often used in the study of non-Darcy flow and it is generally agreed that both the non-Darcy-flow-β-factor and the acceleration coefficient are always positive. In the seepage test for mudstone and argillaceous rock specimen, however, we have found that the β-factor or even both the β-factor and the acceleration coefficient are negative. What＇s that all about？ Is this test phenomenon valuable or is the test method unreasonable？ Aiming at this problem, we have carried out an experiment on seepage properties for mudstone and argillaceous rock, showed the test result, and analyzed the reason why both the β-factor and the acceleration coefficient are negative. In addition, mistakes often made by some researchers about positive or negative signs before the non-Darcy β-factor were pointed out.

关 键 词：渗透特性 非Darcy流β因子 加速度系数 岩样 测试 

分 类 号：TD313.5[矿业工程—矿井建设]