IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitleExperiment on Fractal Feature of Gravelly Soil and Relationship between Fractal Dimension and Debris Flow Initiation
贺拿1; 曾梅2; 陈宁生3; 李涛4; 陈容2
Corresponding Author贺拿
Source Publication山地学报
Other Abstract对116条泥石流沟取样,所取土样共182个,通过室内颗分试验得到其颗粒组成特征,以此为基础引入分形理论计算各土样的分维值,并分析分维值与级配特征之间的关系。分析发现:泥石流源区砾石土以一重分形特征为主,分维值介于2.250~2.798之间,分维值大的砾石土颗粒组成较为均匀,分维值减小,砾石土中的细颗粒含量逐渐降低。基于砾石土分维值分布区间,在野外配置土样开展泥石流启动试验,综合分析试验现象、孔隙水压力及含水量变化情况得到以下结论:形成泥石流的砾石土具有临界特征,分维值小于2.4的砾石土不易形成泥石流;分维值介于2.4~2.6时,以土力类泥石流为主,泥石流重度较高且规模较大;分维值介于2.6~2.7时,以水力类泥石流为主,泥石流的重度较低,以稀性泥石流为主,并伴有明显的阵性特征。分维值及降雨条件相同时,土体变形(未启动形成泥石流)或破坏启动形成泥石流的时间与密度呈正相关关系。 ; About 182 gravelly soil samples were taken from 116 gullies in debris flow prone area. By means of grain size analysis experiment the feature of gravelly soil is obtained,on the basis of grain size analysis results the fractal theory was introduced to calculate the fractal dimension of each sample,at the same time,the relationship between
fractal dimension and particle size distribution was discussed. After comprehensive analysis found that gravelly soil in debris flow prone area is mainly concentrated in one dimension,and the value of one dimension fractal ranges from about 2. 250 to 2. 798,the larger the dimension fractal the more uniformly the gravelly soil becomes,while the fine particle content decreased along with the value of fractal dimension decreased. Based on distribution scope of fractal dimension,debris flow initiation experiment was conducted in the field,and then by comprehensive analysis of experiment phenomenon,real time pore-water pressure and water-content conditions in the slope the following results has been achieved: the gravelly soil which can transfer into debris flow have prominent critical property,the critical value of fractal dimension is 2. 4. When fractal dimension below 2. 4,the possibility of gravelly soil transfer
into debris flow is extremely low,when fractal dimension value ranges from about 2. 4 to 2. 6,the soil destruction and form into debris flow can be explained by soil mechanics,under this circumstance,debris flow density is higher and the scale is larger. While fractal dimension value ranges from about 2. 6 to 2. 7,the soil destruction and form into debris flow can be explained by hydraulics,and debris flow density is lower,at the same time the formation of debris flow possess significant intermittent characteristics. Under the condition of identical fractal dimension and
rainfall,the time of soil deformation ( debris flow do not initiate) or destruction and transferred into debris flow is significantly positive related with soil density.
Keyword砾石土 分形特征 分维值 泥石流启动 试验
Subject AreaP642.23
Indexed ByCSCD ; 北大中文核心
Funding Organization灾害风险综合研究计划中国委员会(IRDR-CHINA)资助项目“社区山地灾害风险管理机制研究”(IRDR2012-Y01) ; 河南理工大学博士基金(B2015-58)
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GB/T 7714
贺拿,曾梅,陈宁生,等. 砾石土分形特征及其与泥石流启动关系试验[J]. 山地学报,2016,34(1):63-70.
APA 贺拿,曾梅,陈宁生,李涛,&陈容.(2016).砾石土分形特征及其与泥石流启动关系试验.山地学报,34(1),63-70.
MLA 贺拿,et al."砾石土分形特征及其与泥石流启动关系试验".山地学报 34.1(2016):63-70.
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