【摘要】 通过水平渗流试验,以NaCl,KCl,LiCl,NH4Cl,CaCl2和MgCl2溶液为研究对象,分别测定不同阳离子引起微粒释放、导致多孔介质水敏感性发生的临界盐浓度值(CSC)。研究结果表明:临界盐浓度不是一个单一的浓度值,而是一个范围,其中一价阳离子Na+、K+、Li+和NH4+溶液的临界盐浓度分别为0.06±0.005、0.05±0.005、0.05±0.005和0.01±0.005mol/L;在二价阳离子中,Mg2+能引起极其轻微的微粒释放,但是没有明显的临界值,Ca2+不但不能引起微粒释放,而且有强烈地抑制微粒释放的作用,可以认为二价阳离子没有明显的临界盐浓度。更多还原

【Abstract】 With horizontal seepage experiments,this paper analyzes the critical salt concentrations（CSC）of the different cations,by examining such solutions as NaCl,KCl,LiCl,NH₄Cl,CaCl₂ and MgCl₂,which can cause the particle release of water sensitivity of porous media.The research results show that the critical salt concentration is not a single value,but is a range;the critical salt concentrations of monovalent cation solutions of Na+,K+,Li+ and NH₄+ are 0.06±0.005,0.05±0.005,0.05±0.005 and 0.01±0.005 mol/L,respectively.The divalent cations of Mg 2+ can cause extremely slight particles release,without an obvious critical value.The Ca 2+ cannot cause particle release,however,it restrains the occurrence of this phenomenon.A conclusion can be drawn that the divalent cations have not apparent critical salt concentrations.更多还原