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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。
Aiming at the common problems of debris flow block structure being damaged by impact, a new technology of flexible gabion arch interception dam is proposed. Flexible gabion arch to gabion as the main material, masonry arch, the upstream surface of the laying of waste tire cushion pad, blocking debris flow. Using ANSYS LS-DYNA software, the dynamic response of the flexible gabion arch structure to debris flow impact is analyzed and compared with the rigid masonry structure. Through the calculation of MIDAS GTS software, the change of pore water pressure and the static stability characteristics after debris flow of gabion arch were analyzed. The numerical results show that the flexible gabion arch structure can reasonably optimize the structural stress and deformation adaptively, and reduce the negative impact on the structure caused by the impact load of boulders and the slurry pressure of saturated debris flow.