首页|基于Flow-3D的桩林坝不同布置形式对坝基的冲刷侵蚀

基于Flow-3D的桩林坝不同布置形式对坝基的冲刷侵蚀

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桩林坝是一种以桩为基础的竖向格子坝,既有良好的受力条件,又相对节约材料,同时拥有"拦粗排细"的功效,现有桩林坝的研究,多在冲击荷载、拦截固源和调控泥石流性能等方面构建不同布置形式的桩林坝模型.以杨家沟为例,通过野外现场踏勘和数值仿真计算,基于Flow-3D软件开展数值模拟研究,建立不同布置形式(单排桩、双排桩、桩间距、排间距)的桩林坝模型,探讨不同影响因素下桩林坝坝基冲刷侵蚀规律.结果表明:桩林坝的整体设计中桩林不宜过密,桩间距和排间距以2.5 m为宜;单排桩的稳定性较弱,在泥石流冲击下极易发生剪切破坏,且对上游的"固源"作用远不如多排桩,但单排桩的冲刷深度及侵蚀规模均小于多排桩.研究成果对桩林坝的布置形式及冲刷机制提供数据支撑,并为震后泥石流防治工程设计提供参考.
Erosion and Scouring of Dam Foundations Caused by Different Layout Patterns of Pile-forest Dams Based on Flow-3D
Pile-forest dams are vertically structured lattice dams based on piles,which offer favorable load-bearing conditions,rela-tive material efficiency,and the ability to trap coarse sediment while allowing fine sediment to pass through.Existing research on pile-forest dams has mainly focused on constructing different layout models to investigate the impact loads,sediment source interception,and regulation of debris flow performance.Taking Yangjiagou as an example field surveys was conducted and numerical simulation was calculated,Flow-3D software was used to explore the erosion patterns of pile-forest dam foundations under different influencing factors.Various layouts(single-row piles,double-row piles,pile spacing,and row spacing)of pile-forest dam models were established.The research findings indicate that in the overall design of pile-forest dams,the pile arrangement should not be too dense,and the recom-mended pile spacing and row spacing are 2.5 m.Single-row piles exhibit weaker stability and are prone to shear failure under debris flow impact,which have a lesser"sediment source stabilization"effect on the upstream area compared to multiple-row piles,but the scouring depth and erosion scale of single-row piles are smaller than those of multiple-row piles.The research results provide data sup-port for the layout patterns and erosion mechanisms of pile-forest dams,offering valuable insights for the design of post-earthquake deb-ris flow prevention and control projects.

pile-group damdebris flowscouring depthscour erosion

张友谊、王渝源、王云骏

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西南科技大学土木工程与建筑学院,绵阳 621010

贵州黔程弘景工程咨询有限责任公司,贵阳 550018

桩林坝 泥石流 冲刷深度 冲刷侵蚀

国家重点研发计划

2018YFC1505401

2024

科学技术与工程
中国技术经济学会

科学技术与工程

CSTPCD北大核心
影响因子:0.338
ISSN:1671-1815
年,卷(期):2024.24(20)
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