PFC^2D滑坡阻河机理及冲击致灾数值模拟研究

A Study of Numerical Simulation of River Blocking Mechanism and Disaster Caused by Impact of PFC^2D Landslide

为进一步完善建立在离散元程序上的滑坡汇河阻河致灾机理的数值模拟,以ball-wall方法建立滑坡模型,对滑坡涌入河道后的堆积体形态进行研究。结果表明:在坡高、河宽、方量三个影响因素中,河宽对于滑坡是否阻河占首要地位,在河宽较小时滑坡入河后容易阻河,河宽较大时则不易阻河。方量和坡高对堆积体形态也有一定的影响,坡高越高,方量越大越容易造成阻河。滑坡的最大冲击荷载受到河宽和坡高的双重影响,坡高越高,河宽越小冲击力越大。

In order to further improve the numerical simulation of the disaster mechanism caused by the confluence of landslide based on the discrete element program,the landslide model was established by ball-wall method to study the shape of accumulation after the landslide gushed into the river.The results show that among the three influencing factors of slope height,river width and square volume,the river width plays an important role in whether the landslide blocks the river or not.It is easy to block the river after the landslide enters the river when the river width is small,and it is not easy to block the river when the river width is larger.The square volume and slope height also have a certain influence on the shape of the accumulation body.The higher the slope height is,the larger the square volume is,the easier it is to block the river.The maximum impact load of the landslide is affected by both the width of the river and the height of the slope.The higher the height of the slope is,the smaller the width of the river is,the greater the impact force is.