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本研究尝试以PFC3D软件仿真边坡崩滑及运移至河道堆积的过程,以渗流力施加于边坡地盘材料以启动滑动体运动的方式来模拟降雨诱发的边坡崩滑现象,仿真结果显示此方法简易可行。通过河道冲刷的阶段式模拟重建对整体土砂变迁过程进行评估,认为唐家山堰塞湖天然坝体短时间内变迁过程可分为崩塌初期、刷深阶段、刷深/拓宽阶段而至最终的堆积型态;罗吉斯回归分析比DBI与鉴别分析保守但较能解释各冲刷阶段的天然坝稳定性评估。
In this study, PFC3D software was used to simulate the process of slope collapse and transport to the river bank, and the seepage force was applied to the slope site material to initiate the sliding body movement to simulate the rainfall-induced slope collapse and slippage. The simulation results show This method is simple and feasible. Through the phase simulation of river scouring, the whole process of soil sand change was evaluated. The evolution process of the natural dam body of Tangjiashan barrier lake in a short period of time can be divided into initial stage of collapse, deep stage of brushing, deep stage of brushing / widening and finally accumulation The Logistic regression analysis is more conservative than the DBI and discriminant analysis but more likely to explain the natural dam stability assessment at each washout stage.