岩体单裂隙非饱和渗流毛管压力-饱和度关系研究

在进行裂隙岩体非饱和渗流研究中，选用合理的裂隙岩体毛管压力一饱和度关系曲线非常关键。基于裂隙岩体非饱和渗流特点，简述当前国内外非饱和裂隙岩体毛管压力-饱和度关系曲线模型的研究状况。总结出非饱和裂隙渗透具有毛细管流、薄膜流、优先流、裂隙-基质相互作用和沟槽流特点；分析了建立单裂隙岩体非饱和渗流毛管压力-饱和度关系曲线模型的主要方法，包括物模试验法、数值计算法和数学推导法，并归纳这些方法的计算结果；最后，结合渗流特点，对各种曲线模型结果进行比较，进一步分析得出：（1）目前的曲线关系均建立在毛管理论基础之上，几乎没有反映渗流其他特点的关系曲线；（2）运用数值计算法和数学推导建立曲线模型较为简便：（2）在排水曲线初始时段，Brooks—Corey（BC）模型模拟得到的结果比van Genuchten（VG）模型要好些，而在末尾时段VG模型要好些。

Research on capillary pressure-saturation curve for a single fracture in an unsaturated fractured mass

It is an issue to choose an appropriate capillary pressure-saturation curve in the research of unsaturated fractured mass.Based on the characteristic of the unsaturated fractured mass,the research on the capillary pressure-saturation curve in an unsaturated fractured mass is summarized.It can be seen that seepage in an unsaturated fractured mass has some special characteristics including capillary flow,film flow,preferential flow and facture-matrix interaction;three methods to establish the capillary pressure-saturation curve,including physical laboratory,numerical simulation and mathematical computation;and all the results of these methods are also summarized.Finally,according to the characteristics of the seepage in an unsaturated rock mass and all these result of the capillary pressure-saturation curve,the following results can be concluded:(1) there is no capillary pressure-saturation curve which can reflect the other characters of the seepage in unsaturated rock mass except the capillary flow;(2) it is a convenient method to build the capillary pressure-saturation curve by numerical simulation and mathematical computation;(3) the capillary pressure-saturation curve simulated by Brooks-Corey(BC) model is better than by van Genuchten(VG) at initial stage during drainage,but worse at the last stage.