拦挡坝-桩群复合结构的高速滑坡碎屑流拦挡效果  

Blocking Effect of Retaining Dam⁃Pile Group Composite Structure on High Speed Landslide Debris Flow

作　　者：曾金 ZENG Jin(China Railway First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道建筑》2023年第9期128-134,共7页Railway Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划(N2021G005)。

摘　　要：针对仅依靠单一形式的防护结构往往难以有效防治滑坡碎屑流灾害的问题,将拦挡坝和桩群两种防护方法相结合,并采用离散元模拟分析拦挡坝-桩群复合式结构的防护效果。考虑了不同形状的桩群结构,从滑坡碎屑流堆积形态、流速变化、桩群潜在失效可能性、拦挡坝冲击力降幅等方面评价复合结构的防护效果。结果表明:方桩桩群与拦挡坝组合形成的复合结构具备更优的拦挡效果,能更显著地削弱滑坡碎屑流的冲击破坏能力;方桩桩群具有更高的失效可能性。建议工程结构设计中采用较大的桩高以避免越流现象,同时采用垫层等措施保护桩群,避免发生冲击破坏。In view of the problem that it is difficult to effectively prevent landslide debris flow disaster by relying only on a single form of protection structure,two protection methods of retaining dam and pile group were combined,and discrete element simulation was used to analyze the protective effect of retaining dam-pile group composite structure.Considering different shapes of pile group structures,the protective effect of composite structures was evaluated from the aspects of landslide debris flow accumulation morphology,flow velocity changes,potential failure probability of pile groups,and impact force reduction of retaining dams.The results show that the composite structure formed by the combination of square pile groups and retaining dams has a better retaining effect,which can significantly weaken the impact damage ability of landslide debris flow.The square pile groups have a higher probability of failure.It is recommended to use larger pile heights in the design of engineering structures to avoid overflow phenomena,and to use measures such as cushion layers to protect pile groups from impact damage.

关 键 词：边坡 高速滑坡碎屑流 拦挡坝 桩群 拦挡效果 离散元 

分 类 号：TU43[建筑科学—岩土工程]