四川九绵高速平武段物源量对泥石流流体性质与致灾强度影响的差异性分析

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中文摘要：九绵高速公路LJ9段沟谷型泥石流灾害频发,时常对附近村落和基础设施造成威胁.为了避免灾害对区域高速公路和G247国道的二次冲击,对九绵高速LJ9段沿线存在泥石流暴发痕迹的6条泥石流沟的物源特征与规模进行研究,认为该地区泥石流属于低频沟谷暴雨型.泥石流容重值在1.647～1.843 g/cm3,流速为3.45～6.54 m/s,流量为29.47～253.45 m3/s,一次过流总量为0.99×104～8.28×104m3.文章通过对比九绵高速"8·16"泥石流规模特征差异,分析物源量与泥石流的容重、规模的关系,建立了相关性公式.研究结果发现:(1)研究区泥石流属于低频沟谷暴雨型,流体性质与沟道物源量紧密相关,单位面积物源量与泥石流容重呈线性关系;单位面积物源量大于1.65×105m3/km2和小于1.13×105 m3/km2时,泥石流分别表现为黏性和稀性.(2)在相同地质条件下,泥石流物源量与规模之间呈线性相关,泥石流一次总量随流域单位面积物源量减小而减小.(3)泥石流致灾能力受物源量控制,物源总量超过80×104m3的沟道易形成黏性泥石流,沟口的堆积扇更大,对应破坏力更强;物源总量小于80×104 m3的沟道更易形成稀性泥石流,冲出沟口的破坏性明显小于黏性泥石流,对沟口的人员与工程建设的威胁更小.该研究结果可为九绵高速公路的规划设计与建设提供一定参考,也为山区基础设施的安全运营、灾害防御工程建设工作提供科学依据.

外文标题：Differential analysis of sediment volume on fluid properties and debris flow disaster impact in the northwest traffic corridor of Sichuan Province

外文摘要：The LJ9 segment of Jiumian Expressway frequently experiences gully-type debris flow disasters,posing threats to nearby villages and infrastructure.Considering the unique characteristics and importance of the highway and G247 national road,this study investigates the material source characteristics and scale of six debris flow gullies with debris flow outbreak traces along the LJ9 section of Jiumian Expressway.The debris flows in this area are classified as low-frequency gully flash flood types.The bulk density of the debris flows ranges from 1.647 to 1.843 g/cm3,with velocities between 3.45 and 6.54 m/s,and flow rate ranging from 29.47 to 253.45 m3/s.The total volume of the debris flow ranges from 0.99×104 to 8.28×104 m3.This paper compares the differences in the scale characteristics of the"8·16"debris flow on the Jiumian Expressway,and analyze the relationship between the volume of material source and the bulk density and scale of debris flow,establishing relevant calculation formulas.The results show that:(1)The fluid properties of debris flow in the study area are classified as low-frequency gully flash flood types,closely related to the volume of material source,with a positive correlation between unit area material source volume and debris flow bulk density.When unit area material source volume exceeds 1.65×105 m3/km2 or falls below 1.13×105 m3/km2,debris flow exhibit viscous or diluted characteristics,respectively.(2)Under similar geological conditions,there is a linear correlation between material source volume and debris flow scale,with total debris flow volume decreasing as unit area material source volume decreases.(3)Debris flow damage potential is controlled by material source volume.Gullies with material source volumes exceeding 800 000 m3 are more likely to produce viscous debris flows,which has greater destructive power and form larger debris flow fans at their mouths.These findings provide insights for the design and construction of the Jiumian Expressway and serve as a scientific basis for the safe operation of infrastructure in mountainous regions and the construction work of geological hazard prevention projects.

外文关键词：

debris flowmaterial source volumebulk densitythe total volume of one-time flowscalethe destructive capacity of disaster

作者：

李玲、陈宁生、杨溢、钟政、黄娜

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作者单位：

昆明理工大学公共安全与应急管理学院,云南昆明 650093

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

高原科学与可持续发展研究院,青海西宁 810016

长江大学地球科学学院,湖北武汉 430100

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关键词：

泥石流物源量容重一次过流总量规模物质致灾能力

基金：

国家自然科学基金-国际(地区)合作与交流项目青海省科技厅基础研究计划项目中国博士后科学基金资助项目中国博士后科学基金资助项目

项目编号：

423611448802024-ZJ-904GZC202325712024M753153

出版年：

2024

DOI：

10.16031/j.cnki.issn.1003-8035.202312029

中国地质灾害与防治学报

中国地质环境监测院

中国地质灾害与防治学报

CSTPCD

影响因子：1.096

ISSN：1003-8035

年,卷(期)：2024.35(5)