1.中国科学院水利部成都山地灾害与环境研究所, 四川 成都 610041
2.中国科学院山地灾害与地表过程重点试验室, 四川 成都 610041
3.中国科学院大学, 北京 100049
杨开成(1992—),男,硕士研究生。主要从事山地灾害减灾理论与技术研究。E-mail:kaicheng1992@139.com
游勇(1964—),男,研究员,博士生导师。主要从事山洪泥石流运动机理及综合防治技术研究。E-mail:yyong@imde.ac.cn
纸质出版:2021-12-15
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杨开成,游勇,柳金峰等.桩林坝拦截泥石流闭塞表现及其影响因素[J].防灾减灾工程学报,2021,41(06):1350-1357.
YANG Kaicheng,YOU Yong,LIU Jingfeng,et al.The Blocking Performance of Pile⁃group Dam against Debris Flow and Its Influence Factors[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1350-1357.
杨开成,游勇,柳金峰等.桩林坝拦截泥石流闭塞表现及其影响因素[J].防灾减灾工程学报,2021,41(06):1350-1357. DOI: 10.13409/j.cnki.jdpme.201909019.
YANG Kaicheng,YOU Yong,LIU Jingfeng,et al.The Blocking Performance of Pile⁃group Dam against Debris Flow and Its Influence Factors[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(06):1350-1357. DOI: 10.13409/j.cnki.jdpme.201909019.
开口闭塞表现及其临界值判别是桩林泥石流拦砂坝设计中的关键因素,然而目前国内外对桩林坝的相关研究还较少。通过开展桩林坝拦截泥石流试验,分析了泥石流重度、坝体排数、排间距、横向开口宽度等因素对桩林坝闭塞表现的影响。研究表明:桩林坝闭塞存在全闭塞、半闭塞、不闭塞三种类型。泥石流重度与桩林坝闭塞度呈正相关关系。当桩林排数从一排增加至两排时闭塞度有较大提高。排间距、开口宽度与桩林坝闭塞度成负相关关系。基于试验数据及多元回归分析提出了桩林坝闭塞度的经验计算公式。同时提出了桩林坝拦截泥石流临界综合闭塞判据
F
,当
F
≤8.1时,桩林坝表现为全闭塞类型;8.1
<
F
<
27.5时,桩林坝表现为半闭塞类型;
F
≥27.5时,桩林坝表现为不闭塞类型。
The blocking performance and its critical criterion are important factors that should be considered in the design of pile-group dam, however, there are few researches on pile-group dam at home and abroad. The effects of debris flow bulk density, dam row number, row spacing and transverse opening width on the blocking performance of pile-group dam were analyzed by carrying out laboratory tests. The results show there are three blocking types of pile-group dam for intercepting debris flow including total-blocked type, part-blocked type and none-blocked type. The bulk density of debris flow is positively correlated to the blocking rate of dam. The blocking rate increases greatly when the number of pile rows increases from single to double. Row spacing and opening width are negatively correlated to the blocking rate of dam. The empirical formula for calculating the blocking rate of pile-group dam was presented based on experimental data and multiple regression analysis. A critical comprehensive criterion for debris flow blocking performance of pile-group dam was presented. When F≤8.1, the pile-group dam manifests as total-blocked type, and when 8.1<F<27.5, the dam shows part-blocked performance, otherwise the dam is none-blocked.
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