Study on the Influence of Multi-fracture Predominance Seepage on Slope Stability
Fissures will cause the rainwater to penetrate into the slope quickly and form the dominant seepage flow,which will have an important influence on the seepage field and stability of the slope.Considering the direction,depth,location,permeability anisotropy and rainfall time of fissure zone,a coupled flow-solid model is established based on the saturation-unsaturated seepage theory,and the characteristics of the change of the slope stability under the joint action of multi-fissure and rainfall were analyzed through numerical simulation by adopting the intensity dis-counting method.The results show that when the rainfall intensity is greater than the permeability coefficient along the fissure direction,the influence of thedominant seepage in the fissure area is obvious.The dominant seepage caused by fissure area mainly affects the distribution of seepage field in the initial period of rainfall.With the increase of rainfall duration,the influence of dominant seepage induced by fissure zone gradually decreases,and the influencecan be neglected after 120 h.The safety coefficient is the largest when the fissure zone is located at the top of the slope and the smallest at the foot of the slope.The slope stability coefficient increases when the inclination angle of the fis-sure zone from 0°to 90°,then decreases and increases again,and reaches the minimum value when parallel to the slope angle.The deeper the fissure depth,the more obvious the advantageous seepage,the lower the stability coeffi-cient of slope.
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万方数据
维普
