The cubic law which describe the law of fluid flow in fracture is based on parallel plate joint model , in this paper the cubic law is modified and non - parallel wedge - shaped joint fluid flow equation is formed , coupling relation between seepage and stress is given based on permeability and joint distortion as the linkage between two field , while the coupling mechanism is simple and explicit 描述裂隙水流運(yùn)動規(guī)律的立方定律是建立在平行板裂隙模型基礎(chǔ)上得出的,本文對立方定律進(jìn)行了修正,推導(dǎo)了非平行楔形裂隙水流方程,根據(jù)滲透性和裂隙面變形關(guān)系給出了單裂隙滲流與應(yīng)力耦合公式,耦合的機(jī)理十分簡單、明確。