泥石流格宾拦挡坝在冲击荷载下的动力响应分析

Dynamic response analysis of the gabion dam under impact load

格宾石笼作为一种防治工程新技术,被应用到陇南市宕昌县吉那沟的泥石流治理中。利用有限元软件ANSYS中的LS-DYNA程序,选用刚性球体以10 m/s的速度撞击坝体结构来模拟泥石流对拦挡坝的冲击。通过数值模拟,将格宾石笼坝与浆砌石坝在冲击荷载下的冲击力、应力分布、位移和冲击物的动能进行对比分析。结果表明,相对于浆砌石坝,格宾石笼坝属柔性材料,在冲击荷载作用下,格宾石笼材料能够得到充分利用,且通过产生较大的变形来耗散能量,可以很好地缓冲泥石流的冲击。

As a new type of structure of debris dam,gabion is applied to the governance of debris flow in the ditch of Tanchang county in Longnan. By using the finite element software ansys and ls-dyna program,the dam is impact by the spherical stone at the speed of 10 m / s to simulate the impact of debris flow on debris dam,through numerical simulation,have some comparison and analysis with impact force,distribution of stress,displacement and the kinetic energy of impact object to gaion dam and stone masonry dam under the impact loading. The results show that gabion dam is flexible material,compared with the stone masonry dam,its material can be efficiently used under impact load,and the dam can dissipate much energy by larger deformation in a long time and can more effectively buffer the impact of the stone on debris flow.