川藏公路朗嘎村冲沟型泥石流形成演化机制与防治模式  

Formation evolution mechanism and control model of gully debris flow in Langga Village of Sichuan-Tibet Highway

作　　者：宋亚兵 贺拿[1] 胡桂胜[2,4] 王涛 倪化勇[5] SONG Yabing;HE Na;HU Guisheng;WANG Tao;NI Huayong(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Institute of Mountain Hazards and Environment,Key Lab.of Mountain Hazards and Surface Processes,Chinese Academy of Sciences,Chengdu 610041,China;China Jikan Research Institute of Engineering Investigation and Design,Co.,Ltd.,Xi an 710043,China;Academy of Plateau Science and Sustainability,Xining 810016,China;Institute of Exploration Technology,Chinese Academy of Geological Sciences,Chengdu 611734,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]中国科学院水利部成都山地灾害与环境研究所,中国科学院山地灾害与地表过程重点实验室,成都610041 [3]机械工业勘察设计研究院有限公司,西安710043 [4]高原科学与可持续发展研究院,西宁810016 [5]中国地质调查局探矿工艺研究所,成都611734

出　　处：《成都理工大学学报（自然科学版）》2022年第6期739-750,共12页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国科学院成都山地灾害与环境研究所第二次青藏高原综合科学考察研究项目(2019QZKK0902);中国科学院青年创新促进会项目(2020367);国家重点研发计划项目(2018YFC1505202);国家自然科学基金项目(联合基金项目)(U20A20110)。

摘　　要：以川藏公路朗嘎村崩滑型冲沟泥石流为例,采用野外勘查、遥感解译、室内试验和模型计算等方法,分析泥石流运动特征与形成演化过程,提出该类泥石流的防治模式。研究结果表明:朗嘎村冲沟泥石流是小规模降雨型高频黏性泥石流沟,此次泥石流容重为1.95 g/cm~3,一次冲出固体物质总体积约560.2 m~3,流体总体积约1 002.5 m~3;坡面产流与后端凹槽汇流是其爆发的主要原因。朗嘎村崩滑型冲沟泥石流的防治工程应该采用组合防治模式,以避免泥石流对公路的冲击和淤埋。Gully debris flow in the mountainous area of western China has the characteristics of wide distribution, strong suddenness and difficulty in warning, which raises a scientific and technical problem to the prevention and control of debris flow. Field investigation, remote sensing interpretation, laboratory test and model calculation methods are used to study the landslide gully debris flow that broke out in Langga Village on Sichuan-Tibet Highway on August 10, 2020. The movement characteristics and formation and evolution process of the debris flow are analyzed, and the prevention and control model of this kind of debris flow is proposed. The results show that the debris flow in the gully of Langga Village is a high-frequency viscous debris flow trench with small rainfall type. The bulk density of the debris flow is 1.95 g/cm~3, and the total volume of solid material and fluid is about 560.2 m~3 and 1002.5 m~3, respectively. It is recognized that the confluence of slope runoff and back end groove is the main reason of its outbreak. The study leads to the recognition that the prevention and control of debris flow in the gully of Langga Village should be mainly based on engineering prevention and control. Anchor rod and flexible protective net can be used in the source area to fix the soil and overflow, and slag bar, drainage channel and open hole be used to avoid the impact of debris flow on the highway and silting.

关 键 词：冲沟泥石流 朗嘎村 形成机制 演化过程 防治对策 

分 类 号：P642.23[天文地球—工程地质学]