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通过开展岩石单裂隙不同粗糙起伏、水力梯度及法向荷载作用下的非线性渗流特性室内试验,研究了裂隙非线性渗流特征与发生机制,建立了考虑裂隙几何形貌的临界雷诺数Rec模型。研究结果表明:随着裂隙试样两端的水力梯度逐渐增大,裂隙内水流流态从线性流向非线性流转变,过流流量(Q)与水力梯度(#P)的实测数据可以很好地用Forchheimer方程拟合;随着法向荷载的增大,Forchheimer方程线性项系数A增加了2~4个数量级,非线性项系数B增加了3~5个数量级;在建立的以水力开度eh为基本变量的非线性系数B参数化表达式基础上,首次提出了定量表征裂隙非线性渗流发生条件的临界雷诺数Rec模型。
Through the laboratory tests of nonlinear seepage properties under different roughness, hydraulic gradient and normal load of single rock fracture, the characteristics and mechanism of nonlinear seepage of fractures are studied, and the critical Reynolds number Rec model considering fracture geometry is established. The results show that the measured data of over-flow (Q) and hydraulic gradient (#P) can be well correlated with the increasing hydraulic gradient at both ends of the cracked specimen and the flow pattern in the fracture changing from linear to non- With the Forchheimer equation fitted; With the increase of normal load, Forchheimer equation linear coefficient A increased by 2-4 orders of magnitude, nonlinear coefficient B increased by 3-5 orders of magnitude; established in hydraulic opening eh It is the first time that the critical Reynolds number Rec model that quantitatively characterizes the occurrence of fractures non-linear seepage is proposed for the first time.