带无粘结预应力钢绞线的格栅坝抗冲击性能分析

Analysis of impact-resistance performance of grille dam with unbonded tendons

以舟曲县三眼峪沟泥石流灾害治理工程中大8号格栅坝为研究对象,在格栅柱中设置无粘结预应力钢绞线,使坝体在受到块石冲击时能充分发挥坝体的整体作用,进而减小局部塑性变形.采用ABAQUS进行块石冲击的数值模拟,并对比新坝和旧坝的位移、冲击力、加速度和von Mises应力响应.结果表明:相同的冲击条件下,带无粘结预应力钢绞线的新坝比旧坝产生的位移值小,冲击力峰值小,冲击方向的加速度响应值小;在块石撞击瞬间新坝坝体的von Mises应力分布均匀,最大的应力值较旧坝的小;新坝较旧坝有更好的抗冲击性能.

Taking the 8-# grille dam in harnessing project of mudrock flow disaster in sanyanyugou,Zhouqu county as research object,unbonded tendons were imbedded into horizontal grille column to make the dam body play fully its integral function against the impact of the rocks and reduce local plastic deformation thereby.By means of finite element analysis software ABAQUS,the numeric simulation of rock block impact was carried out and the displacement,impact load,acceleration,and von Mises stress response of new and old dams were compared.The result shows that under identical impact condition,the displacement of the new grille dam with unbonded tendons will be smaller than that of old dam,peak value will be smaller,the acceleration response value will be small in impact direction;the distribution of von Mises stress will be uniform at the instant of rock impact on new dam,and the maximum stress will be smaller;so that the new dam will have better anti-impact performance than old one.