不同颗粒组分下泥石流离心机模型试验研究  

Centrifugal model tests on debris flow with different particle compositions

作　　者：周健[1,2] 杨浪[1,2] 王连欣[3] 张娇[4] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中铁第四勘察设计院集团有限公司,湖北武汉430063 [4]上海城市管理职业技术学院土木工程与交通学院,上海200432

出　　处：《岩土工程学报》2015年第12期2167-2174,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41272296;51479138)

摘　　要：采用自主研发的离心机可视化试验装置,在坡度和降雨强度不变的条件下,进行降雨诱发泥石流离心机模型试验,研究不同颗粒组分对泥石流形成形态的影响。通过配置五组不同细颗粒含量的土样进行20g加速度下的离心机试验,分析宏观位移场、水分迁移、孔隙水压力等,研究不同颗粒组分下泥石流的形成机理。研究结果表明:随着细颗粒含量由10%增大至70%,泥石流破坏形态由分层滑动型破坏向整体流滑型破坏转变;不同颗粒组分下渗透系数的不同,是泥石流不同破坏形态的主要原因。Using the self-developed visualization test apparatus with constant slope and rainfall intensity, centrifuge model tests on rainfall-induced debris flow are carried out in order to study the formation mechanism of debris flow under different particle compositions. The test conditions include 20 times of gravity, five soil samples and different fine particle contents. Through the analysis of macroscopic displacement fields, moisture migration and pore water pressures under different particle compositions, different morphological characteristics of debris flow are observed and discussed. The test results indicate that the failure pattern of debris flow changes from retrograded sliding to whole flow sliding with the increasing content of fine particles from 10% to 70%. And the difference of permeability coefficient under different particle compositions is the major cause for different failure patterns of debris flow.

关 键 词：降雨诱发泥石流 离心机模型试验 颗粒组分 渗透系数 

分 类 号：TU411.93[建筑科学—岩土工程]