光滑裂隙高流速非达西渗流运动规律的试验研究

 采用光滑平行板模拟岩体裂隙，研制可变裂隙开度、高水力梯度、自循环水流的单裂隙室内渗流模型试验装置。试验研究宽裂隙高水力梯度下的非达西渗流运动规律，建立流速与水力梯度的非线性关系曲线。将试验结果与Lomize紊流公式、速宝玉紊流半经验公式进行对比分析，发现三者在低水力梯度情况下结果较为一致，对于高水力梯度情况会出现较大的差异。最后探讨单裂隙高流速非达西渗流运动特点及判别准则等问题，建立非达西渗流流速与裂隙开度的关系曲线，以便于工程应用。

EXPERIMENTAL STUDY OF NON-DARCY WATER FLOW THROUGH A SINGLE SMOOTH FRACTURE

An experimental apparatus is designed for studying the behavior of high velocity non-Darcy water flow through a single fracture. The fracture is constructed by two smooth parallel plates with variable apertures ranging from 0.5 mm to 6 mm. Circle water flow system and high hydraulic gradient are applied. The experiment is carried out and the behavior of non-Darcy water flow with high velocity is studied. A nonlinear relation between velocity of water flow and hydraulic gradient is fitted. Experimental results are compared with Lomize¢s formula and Su¢s formula；and it is found that they are similar when hydraulic gradient is low，but there are big differences when hydraulic gradient is high. Finally，the theoretical analysis of non-Darcy water flow through a single fracture and the related criterion are discussed. The relation between velocity and fracture aperture of non-Darcy water flow is also developed in order to apply conveniently in the engineering.