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目前单裂隙水流规律广泛采用立方律描述，裂隙中的流量与裂隙两表面间的平均张开度成立方这一关系是从理论上推导出来的。而裂隙随应力发生非线性变形，使裂隙中的水流特性发生变化。本文依据Ｄｅ－ｔｏｕｒａｎｙ和Ｓｕｎｄａｒａｍ的实验数据，研究了在法向应力状态下，裂隙内水力特性的变化规律，发现裂隙内的水流规律不符合立方律，单位水头流量与裂隙开度成指数关系而与应力成幂律关系。
At present, the law of single-fissure water flow is widely used to describe the cubic law. The relationship between the flow in the fissure and the average opening degree between the two surfaces of the fissure is theoretically deduced. The crack nonlinear deformation with stress, so that the flow characteristics of the fracture changes. Based on the experimental data of De-tourany and Sundaram, the variation regularity of hydraulic characteristics in the fracture under normal stress state is studied. It is found that the regularity of water flow in the fracture does not conform to the cubic law, and the unit head flow rate is in exponential relationship with the fracture opening degree The relationship between stress and power law.