粗糙单裂隙高速非达西渗流特性的试验研究

针对裂隙岩体渗流破坏灾害问题。研制符合不同节理粗糙度的拟岩体粗糙单裂隙试件,开展了可变裂隙开度、高水力梯度粗糙单裂隙非达西渗流室内物理试验。研究表明,高渗流速度情况下,渗流水力梯度与渗流流速之间呈现非线性关系;Forchheimer方程能良好拟合高流速条件下粗糙裂隙渗流情况;提出非达西影响系数的半经验关系式,为工程实践中突涌水量预测提供重要参考。

Laboratory study on the features of the high-speed non-darcy seepage flow in single rough fracture

With the expansion of the scale of underground engineering construction,it becomes an important issue about seepage failure hazard of fractured rock mass in engineering and theoretical circles. Developed with simulated rock rough single fracture specimens of different rock joint roughness,laboratory tests of non-Darcy seepage in rough single fracture with variable apertures and high hydraulic gradient are carried out. It is indicated that flow behavior in the rough fractures becomes nonlinear with the high seepage velocity,and the hydraulic gradient and volumetric flow rate data points are fitted very well by the Forchheimer equation. A semi empirical formula of the non-Darcy effect coefficient is presented,which provides an important reference for the prediction of water bursting in engineering practice.