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Influences of underground drainage and rainfall on the stability of a landslide

机译：地下排水与降雨对滑坡稳定性的影响

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The special location of Dayan tang landslide makes it affected by the engineering construction more severely. Some horizontal drainage tunnels are dug beneath the slip belt to enhance the stability and prevent the failure of the landslide during the construction period. The stability of the landslide will be impacted by the heavy foggy rain formed by flood discharge when the hydro project begins operation. A secondary improvement has been done for FLAC program to simulate the infiltration and a three dimensional analysis has been accomplished coupled the soil mechanism with infiltration of rainfall. Conclusions are obtained as follows: firstly, the saturation time of the landslide caused by foggy rain is 1～2 days. Secondly, the accumulation of the over pore pressure in the slip belt is delayed or mitigated for the existence of the drainage tunnels underground and the gravel clay on the surface. Finally, the stability factor is decreased more than 20% and the main broken area takes place at the front and middle part during the foggy rain period.
机译：Dayan Tang Landslide的特殊位置使其受到工程建设的影响更严重的影响。在滑动带下方挖出一些水平排水隧道，以增强稳定性并防止旧山脉在施工期间失效。当水电项目开始运作时，山体滑坡的稳定性将受到洪水放电形成的重雾雨的影响。已经为FLAC程序进行了二次改进，以模拟渗透，并且已经完成了三维分析耦合渗透降雨的土壤机制。结论如下取得：首先，雾雨引起的滑坡的饱和时间为1〜2天。其次，在滑动带中的过度压力的积累被延迟或减轻了地下的排水隧道和表面上的砾石粘土。最后，稳定性因子降低了超过20％，主要破损面积在雾雨期间在前部和中部进行。

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