充水隙宽对顺层岩质边坡稳定性的影响

Influence of water-filled crack width on bedding rock slope stability

基于Navier-Stokes方程推导了倾斜单裂隙中水流的立方定律,并结合质量守恒定律,给出了分段式裂隙内水压分布的确定方法。在此基础上,采用极限平衡方法分析了充水裂隙隙宽对顺层岩质边坡稳定性的影响。结果表明:①边坡内潜在滑面出水段隙宽较大时,随着隙宽的减小,潜在滑面内的水压力将显著增大,边坡稳定性将明显减小;②裂隙进水段隙宽较小时,随着隙宽的增大,裂隙内压力将出现微弱增加,边坡稳定性将出现相对明显的降低;③裂隙各分段隙宽同比例变化,在裂隙水保持层流状态的前提下,裂隙内的水压分布不会发生变化;④充水裂隙内,当隙宽变化处距离出水端距离增加时,隙宽变化处的压力将呈现出先增大后减小的变化,边坡稳定性系数将呈现先减小后增大的变化。

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:①when 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.②when 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.③Under 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.④In 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.