摘要
一、前言 1983年9月长野县西部地震,使御岳发生了3600万m^3的大滑坡,其中2500万m^3的土体滑出约9km,堆积在王龙川干流河床比降4度以下的地方。据日本主要报纸和电视台报道,这次滑坡与通常的泥石流不同,其滑动土体为非饱和状态,属粉状流。 粉状流是由于孔隙气压过剩致使土体有效摩擦角减小而发生的滑动现象。过剩孔隙气压的作用方式有两种:一种是象气垫船那样,粉状体附着在气垫上;
A big debris flow of 36 million m3 was caused by the Nagano Seibu earthquake at Mt.
Ontake,1983, n Japan. This debris flow seemed to be apparently different from the
ordinary debris flow, because it looked to be not saturated.
Then the opinion which this flow was a dry avalanche supported by-pore air pressure
was presented in newspaper & on TV. Others insisted that it was an ordinary debris
flow because there can be no cause of such a high pore air pressure.
This paper proposed the mechanism of unsaturated debris flow in use of the idea of
undrained shear of the saturated torrent deposit , which is analogus to the hydro planing
phenomenon in a rainy high way.
出处
《中国水土保持》
北大核心
1989年第10期54-57,46,共5页
Soil and Water Conservation in China
