高速远程滑坡裹气流态化动力学特性实验研究  

Experimental study of dynamical shearing behaviors of rock avalanche debris under the effect of entrapped gas

作　　者：王玉峰[1,2] 许强[2] 程谦恭[1] 罗忠旭 郭强[1] 张金存[1] 

机构地区：[1]西南交通大学地质工程系,四川成都610031 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《岩石力学与工程学报》2016年第2期268-274,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41530639;41502289);成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2015K012)~~

摘　　要：为定量化揭示高速远程滑坡在裹入气流作用下的动力学特性,以高速远程滑坡裹气流态化运动特性实验成果为基础,运用自行设计的水平圆环式旋转剪切流变装置,开展一系列环剪实验,获取碎屑流在不同裹入气流作用下的动态抗剪强度参数。结果表明:(1)碎屑流运动过程中,气体的裹入,可起到明显的减阻作用;(2)在碎屑流的整个运动过程中,随着时间的推移,碎屑流与环盖间剪切力并非一恒定值,而是呈现出忽高忽低的波动性演化特征;(3)随着碎屑流受剪时间的增长,碎屑流与环盖间剪切力值整体呈略微增长的趋势,且剪切速率越大,该趋势越明显。In order to reveal the dynamical shearing behaviors of rock avalanche debris under the effect of entrapped gas,an annular shear shell was designed based on the flow characteristics of rock avalanche debris under the effect of entrapped gas. A series of ring shear tests were conducted to record the dynamical shearing values of rock avalanche debris as the variation of gas entrapment. During the motion of debris,the entrapment of gas reduced the dynamical shearing resistance between debris and top disk obviously. The shearing resistance between the debris and top disk fluctuated with time. With the increase of shearing time,the shearing resistance between the debris and top disk increased slightly. And the larger the shearing rate was,the more obvious this trend.

关 键 词：边坡工程 高速远程滑坡 圆环式剪切实验 石英颗粒 供风量 动态剪切力 

分 类 号：P64[天文地球—地质矿产勘探]