The shear process can significantly affect the hydro-mechanical properties of rock fractures. In the present study, a new approach is developed to predict the direct shear process of rock fractures under the constant normal load condition. This approach is validated by three sets of laboratory direct shear test data and it is then used to study the impact of rock mechanical properties on the shear process. The results show that the presented shear modelling approach can reliably predict the entire shear process of direct shear tests on rough rock fractures under the constant normal load condition. The shear strengths and the normal displacement are sensitive to different physical parameters, which are demonstrated through a comprehensive sensitivity analysis of the physical parameters (i.e., the mechanical properties). The presented shear modelling approach and the sensitivity analysis results are useful for further hydro-mechanical investigations of fractured rocks.

剪切过程可以显着影响岩石裂缝的流体力学特性。在本研究中，开发了一种新方法来预测在恒定法向载荷条件下岩石断裂的直接剪切过程。该方法通过三组实验室直剪试验数据进行验证，然后用于研究岩石力学性质对剪切过程的影响。结果表明，所提出的剪切建模方法可以可靠地预测恒定法向载荷条件下粗糙岩石裂缝直剪试验的整个剪切过程。抗剪强度和法向位移对不同的物理参数敏感，通过对物理参数（即力学性能）的综合敏感性分析证明了这一点。