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传统极限平衡法和有限元强度折减法很难真实反映材料的破坏过程,严重制约了边坡的渐进破坏研究。利用颗粒流软件,设计了0.1m粒径高10m土坡数值模型,初始模型在重力作用下不会发生破坏,通过单独折减粒间粘聚力、单独折减粒间摩擦系数和在初始模型上施加0.1g水平地震加速度等3种方法使得边坡发生破坏,发现粘聚力折减,边坡的初始局部破坏接近于刚体假设,破坏属于渐进破坏,滑体破碎较轻,运动距离不远,最终多级组合滑面接近于弧形,不适用整体分析;摩擦角折减使得边坡发生整体破坏,滑体为弹塑性体,滑体破碎,适用整体分析,滑体运动相对较远;地震作用下,坡体也属于整体滑移,滑体破碎,影响范围和运动范围最大。边坡失稳的剧烈程度是地震作用>摩擦角弱化>粘聚力弱化造成的坡体失稳。破坏是个动态渐进势能动能转化消减,滑体再次趋于稳定的重新破碎堆积的过程。
The traditional limit equilibrium method and finite element strength reduction method are difficult to truly reflect the process of material failure, which severely restricts the progressive failure of slopes. Using particle flow software, the numerical model of 10m soil slope with 0.1m particle size is designed. The initial model will not destroy under the action of gravity. By reducing the intergranular cohesion alone, the interfacial friction coefficient is reduced and the initial model The method of applying 0.1 g horizontal earthquake acceleration makes the slope damage and found that the cohesive force is reduced. The initial local failure of the slope is close to that of the rigid body. The damage belongs to the gradual destruction, the slide body is broken slightly, and the movement distance is not far , The final multi-stage composite slip surface is close to the arc shape, so it is not suitable for the overall analysis. The reduction of the friction angle causes the whole slope to be damaged. The slip body is elastic-plastic body and the slide body is broken. For the whole analysis, Under the action, the slope also belongs to the whole slip, sliding body broken, the scope of influence and the maximum range of motion. The degree of slope instability is the effect of the earthquake> the weakening of the friction angle> the instability of the slope caused by the weakened cohesion. Destruction is a gradual dynamic kinetic energy conversion reduction, slide again stabilized to the process of re-crushing and stacking.