裂隙非饱和渗流试验中毛细隔栅的选择及率定

Selection and Calibration of Capillary Barrier in Unsaturated Seepage Experiment of Fracture

针对进气值较低的材料提出了一种量测进气值的新方法 ,并用该法和常规的常水头渗透试验测定了 6种不同砂粒径、不同配合比的多孔砂浆块的进气值和渗透系数 .率定试验结果表明 ,多孔砂浆块比高进气值陶土板更适宜于作为裂隙非饱和渗流试验和驱替试验中的毛细隔栅 .率定结果也为裂隙非饱和渗流试验选取合适的多孔砂浆块作为毛细隔栅提供了依据 .通过对上述多孔砂浆块进气值的测定可看出 ,本文量测进气值的方法用于测定低进气值材料的进气值是简单易行的 .

In view of low bubbling pressure material,a new method for measuring bubbling pressure is presented in this paper.By use of this method and routine constant head permeability test,the bubbling pressure and permeability coefficient of six kinds of porous mortar of different sand fraction and mix proportion are measured.The calibration test results show that porous mortar is more appropriate than ceramic plate when used as capillary barrier in unsaturated seepage experiment and displacement experiment of fracture.The calibration results also provide a basis for selecting appropriate porous mortar as capillary barrier for unsaturated seepage experiment of fracture.Through the measurement of bubbling pressure of the above mentioned porous mortar,it can be seen that the present method for measuring bubbling pressure is simple and feasible for low bubbling pressure material.