水与裂隙对边坡稳定性的影响分析及工程应用

Influence and Implication of Water and Fissure on Slope Stability

地下水与岩土体之间发生的氧化还原作用,既改变着岩土体中的矿物成分,又改变着地下水的化学组分及侵蚀性,从而影响岩土体的力学特性。将剖面上垂直裂缝深度取为边坡稳定性系数为最小值时的对应深度值来确定裂缝的开裂深度。裂缝与水的相互作用加剧边坡变形并使之滑动。运用岩石边坡平衡破坏的分析计算模型,对工程实例进行稳定性计算与分析。结果表明,在边坡稳定性计算中,考虑裂隙、水以及它们的共同作用能比较合理地评价边坡稳定性状况。

Many factors influence the slope stability,such as lityologic characters,rock structure,sliding surface,shear strength,water,fissures and so on,among which the influence of the water,fissures and their co-action is difficult to determine.For this purpose,this paper mainly discusses how to consider the influences of the water,the fissures and their co-action on the slope stability when slope stability is calculated.The interaction between the groundwater and the rock is very complex,mainly including physical action,chemical action and mechanical action,so the groundwater changes not only the physical,chemical and mechanical characteristic of the rock,but also the characteristic of itself.If the influence of the fissures isnt considered,the influence of the water on the slope may be ignored,which isnt accordance with the fact.According to the principle that the fissure vertical depth is the one when the slope stability coefficient reaches the minimum,the fissure open depth is determined when the infuence of the fissures on the slope stability is considered.The interaction between water and fissures leads to the change of damaging field and seepage field,which accelerates the slope deformation and sliding.Considering the influence of water and fissure,the stability of a basic case is calculated according to the formula by E.Hoek and J.W.Bray.Results show that water and fissure should be considered in stability calculation.