关键词: 岩质边坡; 充水裂隙; 隙宽; 边坡稳定性; 裂隙水压分布; 立方定律;

Abstract: Based on the Navier-Stokes equation, we derived the cubic law of water flow in inclined single fissure, and combined with the law of conservation of mass, put forward the determination method of water pressure distribution in segmented fissure.On this basis, the influence of water filling crack width on the stability of bedding rock slope was analyzed by limit equilibrium method.The results show that:(1)when the crack width of the overflow section of the sliding surface in the slope is large, the water pressure in the sliding surface will increase significantly with decrease of the crack width, and the stability of the slope will decrease significantly.(2)when the crack width of the influent section of the fissure is small, with the increase of the crack width, the pressure inside the fissure will increase weakly, and the stability of the slope will appear obvious decrease.(3)Under the premise that the fissure water keeps laminar flow state, when the crack width of each section of the fissure changes in a same proportion, the water pressure distribution in the fissure will not change.(4)In the water-filled fissure, with the increase of the distance between the position of the crack width changing and the overflow port, the pressure at position where the crack width changes shows a law of first increasing and then decreasing, and the slope stability coefficient shows a change law of first decreasing and then increasing.

Key words: rocky slope; water-filled fissure; crack width; slope stability; water pressure distribution of fissure; cubic law;