小沟床比降沟谷水石流形成原因分析研究——以栾川瓦石岩沟为例  

Research on Water Debris Flow Breaking Out Reasons of Small Gradient Gully ——Take Luanchuan Washiyan Gully as an Example

作　　者：邵莲芬[1,2] 余宏明[1] 彭祖武[1] 陈鹏宇[1] 王硕楠[1,3] 胡媛媛 

机构地区：[1]中国地质大学,湖北武汉430074 [2]黄淮学院,河南驻马店463000 [3]河南省地质工程勘察院,河南郑州450001

出　　处：《灾害学》2013年第4期120-124,共5页Journal of Catastrophology

基　　金：河南省国土资源厅2011年度"两权价款"地质科研项目(2011-622-23);河南省科技厅科技攻关计划项目(122102310477)

摘　　要：从流域地貌形态、沟道径流产能条件入手,借鉴已有入汇型河流研究成果及砂砾土、砂卵石液化研究成果对瓦石岩沟暴发水石流原因进行分析研究。研究结果认为,瓦石岩沟暴发水石流的原因是众多水力产能条件强的支沟、接力式的对产能条件弱的主沟水体注入能量,加速主沟水流至具备启动砂砾土的能力;同时支沟水流产生的连续应力波能使附近砂砾土液化,而后与主沟水流掺混形成水石流体。最后,将瓦石岩沟水石流形成原因概括为"瓦石岩沟模式",为具相同工程地质条件区域沟道水石流危险评价提供参考。In order to analyze the reasons of breaking out water debris flow in Washiyan Gully, one hand there considering landform feathers and gully runoff conditions, the other hand also referencing some research results of mountain confluent river and gravel soil liquefaction. Conclusions show that Washiyan Gully owns many tributaries that have strong hydraulic conditions, and can exchange energy with trunk stream which has weak hydraulic condi- tions. Then trunk stream flow is been speeding up to have the ability to move gravel. Meanwhile tributaries flow are producing continuous stress wave which can liquefy the gravel soil nearby. And the liquefying gravel soil are gradu- ally mixing with flow and then forming water debris flow. Finally, the Washiyan Gully mode is proposed for referencing to similar geological engineering area to evaluate water debris flow risk.

关 键 词：瓦石岩沟 小沟床比降沟谷 水石流 原因分析 河南栾川 

分 类 号：P642.23[天文地球—工程地质学] X43[天文地球—地质矿产勘探]