石笼拱柔性拦截坝新技术及其数值模拟

Numerical simulation of flexible gabion arch dam to prevent and control debris flow blocks

摘要: 针对常见的泥石流拦挡结构被冲击破坏的问题,提出了柔性石笼拱拦截坝新技术。柔性石笼拱以石笼为主要材料,砌筑成拱形,上游面铺设废旧轮胎防冲垫层,拦截泥石流。利用ANSYS LS-DYNA 软件,分析了柔性石笼拱结构对泥石流冲击的动力响应,并与刚性浆砌石结构进行对比。通过MIDAS GTS软件计算,分析了石笼拱拦蓄泥石流后孔隙水压力变化及静力稳定特性。数值计算结果表明,柔性石笼拱结构能合理地优化结构受力,变形自适应,减小巨石冲击荷载以及饱和泥石流的浆体压力对结构的不利影响。

Abstract: Most of the widely used check dams are destroyed by huge impact force of debris flows. Flexible gabion arch dam is thus designed. The structure is made of stone gabions and built in the shape of arch with junked tires attached to the upside. Numerical simulation is performed using the software ANSYS LS-DYNA, focusing on the dynamic response of the structure to the impact of the debris flows. The pore pressure and statistic stability of the above two debris retaining structures are analyzed by MIDAS-GTS. The results indicate that the flexible arch structure can effectively reduce the impact force and mud flow pressure through appropriate deformation.