THE FRICTION LAW AND MOVING VELOCITY OF A SOIL BLOCK ON SLOPES

The motion of a soil block released by a slope failure depends on rigid-and fluid-fri-ctional forces which act on the interface between the moving soil block and the slope sur-face. The rigid friction of these forces, has already been discussed in the authours' formerpaper, and then the present study will discuss the problems relating to fluid friction stre-sses.The fluid frictions can be described in terms of viscous and Reynolds stresses beca-use these are caused by shearing the pore water within a soil block. A new friction lawis presented, discussing the internal structure of fluid frictions. The momentum equationof a siol block moving on slopes is formulated using rigid-and fluid-frictional laws, andanalyzed to obain the theoretical moving velocity.The theoretical results of both the fluid friction law and the moving velocity of a soilblock are tested by flume data.The motion of a soil block released by a slope failure depends on rigid-and fluid-fri-ctional forces which act on the interface between the moving soil block and the slope sur-face. The rigid friction of these forces, has already been discussed in the authours' formerpaper, and then the present study will discuss the problems relating to fluid friction stre-sses.The fluid frictions can be described in terms of viscous and Reynolds stresses beca-use these are caused by shearing the pore water within a soil block. A new friction lawis presented, discussing the internal structure of fluid frictions. The momentum equationof a siol block moving on slopes is formulated using rigid-and fluid-frictional laws, andanalyzed to obain the theoretical moving velocity.The theoretical results of both the fluid friction law and the moving velocity of a soilblock are tested by flume data