ISSN 1003-8035 CN 11-2852/P
    杨静萍,陈宁生,杨志全,等. 干流公路桥涵堵塞对泥石流灾害的风险放大效应[J]. 中国地质灾害与防治学报,2024,35(0): 1-13. DOI: 10.16031/j.cnki.issn.1003-8035.202312008
    引用本文: 杨静萍,陈宁生,杨志全,等. 干流公路桥涵堵塞对泥石流灾害的风险放大效应[J]. 中国地质灾害与防治学报,2024,35(0): 1-13. DOI: 10.16031/j.cnki.issn.1003-8035.202312008
    YANG Jingping,CHEN Ningsheng,YANG Zhiquan,et al. Risk amplification effect caused by blockages in the main stream road bridges and culverts due to the debris flow[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-13. DOI: 10.16031/j.cnki.issn.1003-8035.202312008
    Citation: YANG Jingping,CHEN Ningsheng,YANG Zhiquan,et al. Risk amplification effect caused by blockages in the main stream road bridges and culverts due to the debris flow[J]. The Chinese Journal of Geological Hazard and Control,2024,35(0): 1-13. DOI: 10.16031/j.cnki.issn.1003-8035.202312008

    干流公路桥涵堵塞对泥石流灾害的风险放大效应

    Risk amplification effect caused by blockages in the main stream road bridges and culverts due to the debris flow

    • 摘要: 2020年8月17日,四川省平武县亚者造祖村干流沿岸4条沟相继暴发泥石流,导致G247国道多处断道和垮方,九绵高速项目部及民工驻地等多处遭受巨大损毁,泥石流裹挟的大量漂木汇入干流后,引发下游公路桥涵堵塞并回水淹没村庄,放大了灾害风险。为了避免类似灾害再次发生,灾后基于野外调查和遥感解译等手段,探讨了此次泥石流灾害风险特征,并重点分析了干流公路桥涵堵塞对泥石流灾害的风险放大效应。结果表明:(1)亚者造祖村“8•17”泥石流为低频稀性大规模群发性泥石流,暴发频率约为50年一遇。阿祖沟和杂排沟泥石流在规模上属特大型,麻石扎三号沟和夺补河五号沟泥石流在规模上属大型,堆积扇受灾面积约为16.66×104 m2。(2)干流公路桥涵布设不当,导致泥石流裹挟的大量漂木堵塞桥涵,形成堰塞体,致使受灾面积增大了16.78×104 m2,风险范围扩大了约1倍。(3)对于植被覆盖良好的湿润山区,干流公路桥涵修建时应适当增大桥墩之间的轴向间距,给河道预留出一定的宽度和运行空间,避免因漂木堵塞放大泥石流灾害风险。本研究旨在为类似山区干流公路桥涵合理规划及泥石流相关防治预警工作提供参考。

       

      Abstract: On August 17, 2020, four debris flows successively occurred along four ravines on the main stream in Yazhezaozu Village, Pingwu County, Sichuan Province. This event resulted in multiple collapses and interruptions along the G247 national highway, extensive destruction at the Jiumian expressway project site and laborer residence, among other areas. A significant volume of driftwood carried by the debris flow converged into the main stream, leading to downstream road bridge and culvert blockages, causing backflow and flooding of villages, thereby exacerbating the disaster risk. To prevent similar disasters from recurring, post-disaster investigations using field surveys and remote sensing interpretations explored the characteristics of this debris flow disaster’s risk. A primary focus was placed on analyzing the risk amplification effect caused by blockages in the main stream road bridges and culverts due to the debris flow. The results indicated: (1) The August 17 debris flow in Yazhezaozu Village was a rare, large-scale, low-frequency event occurring approximately every 50 years. The debris flows in Azu Gully and Zapai Gully were extremely large-scale, while the Mashizha No. 3 Gully and Duobu River No. 5 Gully were large-scale, with an affected debris fan area of about 16.66×104 square meters. (2) Improper layout of the main stream road bridges and culverts resulted in the blockage of driftwood carried by the debris flow, forming dammed bodies, increasing the affected area by 16.78×104 square meters, and enlarging the risk range by about 1 time. (3) In well-vegetated, moist mountainous areas, when constructing main stream road bridges and culverts, it is advisable to appropriately increase the axial spacing between bridge piers, allowing for a certain width and operational space in the river channel. This will prevent the amplification of debris flow disaster risks caused by driftwood blockages. This study aims to provide guidance for the reasonable planning of main stream road bridges and culverts in similar mountainous areas and relevant prevention and early warning of debris flow.

       

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