Mechanical Behaviors of rocks
Mechanical Behaviors of Rocks
stress g astic failure Yield stress oy elastic e2 e strain General relationship between stress and strain for rock deformation
General relationship between stress and strain for rock deformation Yield stress elastic plastic failure strain stress
Linear elasticit Hooke's law =E8 e=o/ctan a Where o is stress s strain and e the Youngs modulus or elastic modulus
Where is stress, strain and E the Young’s modulus or elastic modulus Hooke’s law Linear elasticity = E E= / =tan
u=u(y) 0 Sketch shown viscous flow layers The flow speed is the function of y
Sketch shown viscous flow layers The flow speed is the function of y
Linear viscous law (Newtonian viscous law) Shear stress is proportional to speed gradient Viscosity (Pa'S i- Flow speed di The variation of flow speed along the y direction, called speed gradient t Shear stress. or frictional force between the adjacent flow layers
dy du = —粘度，其单位为帕• 秒（Pa • s） u —流速 dy du —u 在 y 轴方向的变化率，称为速度梯度 —剪应力 Linear viscous law（Newtonian viscous law） Shear stress is proportional to speed gradient Viscosity (Pa·s) Flow speed The variation of flow speed along the y direction, called speed gradient Shear stress, or frictional force between the adjacent flow layers