Title

緩坡上石流運動之研究

Translated Titles

GRANULAR FLOWS ON MILD INCLINES

DOI

10.29417/JCSWC.199305_24(1).0001

Authors

劉格非(Ko-Fei Liu);郭哲昆(Che-Kun Kuo);吳昌修(Chang-Shiou Wu)

Key Words

石流 ; 特徵線法 ; 震波 ; Granular Flows ; Method of Characteristics ; Shock Waves

PublicationName

中華水土保持學報

Volume or Term/Year and Month of Publication

24卷1期(1993 / 05 / 01)

Page #

1 - 11

Content Language

繁體中文

Chinese Abstract

臺灣東部山坡地之土石流現象主要爲石流(granular flows)。本文利用Savage and Hutter在1989年提出之石流運動方程式以特徵線法(method of characteristics)來研究石流運動之行爲。我們發現:當石流總質量大,土壓係數大,或坡度陡時,石流較易運動,運動後速度較大,停止後波高較小,最後傳遞距離較遠。另外我們也以數值方法來模擬擋土牆的影響。結果發現在不考慮擋土牆側之靜壓力時撞擊力先爲負後爲正,最後則爲很小的靜壓差,因爲震波太弱,故最大撞擊力主要來自動能。撞擊力與擋土牆距離之關係則是先增後減,在石流前端速度最大時,有最大撞擊力。而最大總力則爲最後靜壓,並與擋土牆之距離成反比。

English Abstract

Granular flows occur frequently in the mountainous area of east Taiwan. We use the model proposed by Savage and Hutter (1989) to simulate the motion of granular flows. As the total mass, earth pressure coefficient or bottom slope increases, granular flows can start moving easier. As a result, the maximum velocity increases, the final wave high decreases and propagation distance increases. The impact force on a structure first increases then decreases in time. The front shock wave is too weak to contribute. The most important impact force comes from the kinetic energy. Impact force first increases to a maximum then decreases as the position of the structure moves downstream. But total force decreases as the structure moves doconstream.

Topic Category 生物農學 > 農業
生物農學 > 森林
生物農學 > 畜牧
生物農學 > 漁業
生物農學 > 生物環境與多樣性
工程學 > 土木與建築工程
工程學 > 市政與環境工程