地形对碎屑流冲出的影响作用(英文)  

Roles of Topography on the Run-out of Rock Avalanche

作　　者：苏志满[1] 鵜飼恵三[2] 杨情情[2] 蔡飞[2] 徐林荣[1] 

机构地区：[1]中南大学土木建筑学院 [2]群马大学土木与环境工学系

出　　处：《西北地震学报》2011年第B08期58-63,共6页Northwestern Seismological Journal

基　　金：交通部西部交通建设科技项目(200831800087);四川省交通厅科技项目(2006A024-582)

摘　　要：传统的碎屑流冲出预测经验模型主要基于冲出物体积与冲出物到达角的假设关系式,并没有考虑地形的影响,其中到达角指滑坡后壁顶点与堆积体末端点连线的角度。本文通过小尺寸模型槽实验研究不同地形条件对碎屑流冲出的影响,发现冲出路径上的缓地形将增加到达角,对近期的两个地震诱发型碎屑流场点的调查结果也表明了缓地形对到达角的影响。还发现冲出物受地形限制而改变冲出方向时可能增加冲出角。考虑上述两种地形约束作用的冲出距离预测值将小于传统的预测方法。Conventional empirical models for predicting travel distance of rock avalanche were generated based on the assumed correlation between the volume of involved debris and its angle of reach,which didn＇t take account of the role of topography on the run-out of rock avalanche.Here the angle of reach refers to the angle of line connecting slide crest and accumulation tip.In this paper,several cases of small scale flume tests are performed to investigate run-out behaviors of rock avalanches under different terrain conditions.Results show that the gentle segment of slope in travel path increases the angle of reach.Field checking for two recently earthquake induced rock avalanches also revealed the same phenomenon.It is also found that change of travel direction as a consequence of topography constraint will increase the angle of reach.A deduction is drawn that a smaller value of travel distance will be generated considering the both topography influences,comparing with the expected value based on the conventional assumed correlation.

关 键 词：碎屑流 到达角 模型槽实验 现场调查 地形影响 

分 类 号：P642.22[天文地球—工程地质学]