摘要
利用一种专利装置与MTS815.02型岩石力学试验系统,进行了破碎砂岩的稳态渗透试验,得到了不同孔隙率下破碎砂岩的渗透率和非Darcy流β因子。通过线性回归得到了渗透率、非Darcy流β因子与孔隙率之间的关系。认为破碎岩石的渗透特性主要是由孔隙率决定的,孔隙率不仅与当前的应力有关,更取决于加载历史。研究表明,水在破碎砂岩中的渗流一般不服从Darcy定律,而服从Forchheimer关系,特别是在小孔隙率下,非Darcy性更为突出;渗透率、非Darcy流β因子与孔隙率之间的关系可用幂函数拟合。
A patent device, which is combined with the MTS815.02 Rock Mechanics Test System, is used to measure the seepage properties of non-Darcy flow in broken sandstone; and the permeability and the non-Darcy flow β-factor are obtained by steady-state seepage method. The relations between both the permeability and the non-Darcy flow β-factor and porous ratio are obtained through linear regressions. It is held that the seepage properties are mainly decided by the porous ratio; and the porous ratio is concerned with not only the current stress, but mainly also the history of loading. The test results show that the seepage flow of water in broken sandstone does not obey the Darcy＇s law any longer, but obey the Forchheimer＇s formula; and the characteristic of non-Darcy flow is more remarkable when the rock is under less porous ratio. Both the permeability and the non-Darcy flow β-factor can be fit by power functions of porous ratio.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第9期1385-1388,共4页
Rock and Soil Mechanics
基金
国家自然科学基金重大项目(No.50490270)
国家自然科学基金重点项目(No.50134040)
国家杰出青年基金项目(No.50225414)
博士点基金项目(No.20010290003)资助。
