[1]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,(01):63-70.[doi:10.16089/j.cnki.1008-2786.000101]
　HE Na,ZENG Mei,CHEN Ningsheng,et al.Experiment on Fractal Feature of Gravelly Soil and Relationship between Fractal Dimension and Debris Flow Initiation[J].Mountain Research,2016,(01):63-70.[doi:10.16089/j.cnki.1008-2786.000101]
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砾石土分形特征及其与泥石流启动关系试验()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2016年01期
页码:
63-70
栏目:
山地灾害
出版日期:
2016-02-01

文章信息/Info

Title:
Experiment on Fractal Feature of Gravelly Soil and Relationship between Fractal Dimension and Debris Flow Initiation
作者:
贺 拿1; 曾 梅2; 陈宁生3; 李 涛4; 陈 容2
1.河南理工大学土木工程学院，河南 焦作 454000； 2. 河南工业和信息化职业学院，河南 焦作 454000； 3.中国科学院水利部成都山地灾害与环境研究所/山地灾害与地表过程重点实验室，四川 成都 610041； 4.河南省建筑科学研究院有限公司，河南 郑州 450053
Author(s):
HE Na1;  ZENG Mei2;  CHEN Ningsheng3;  LI Tao4;  CHEN Rong2
1. School of Civil Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China； 2. Henan College of Industry & Information Technology, Jiaozuo 454000,Henan，China； 3. Key Laboratory of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041,China; 4. Henan Provincial Academy of Building Research, Zhengzhou 450053， Henan,China
关键词:
砾石土; 分形特征; 分维值; 泥石流启动; 试验
Keywords:
gravelly soil;  fractal feature;  fractal dimension;  debris flow initiation;  experiments
分类号:
P642.23，TU411
DOI:
10.16089/j.cnki.1008-2786.000101
文献标志码:
A
摘要:
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。
Abstract:
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.

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备注/Memo

备注/Memo:
收稿日期(Received date)：2015-06-03；改回日期(Accepted)：2015-08-22。 基金项目(Foundation item)：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）。[This research were financially supported by Project on Risk Management Mechanisms of Community-Based Mountain Hazards（Grant No. IRDR2012-Y01）supported by Chinese National Committee for Integrated Research on Disaster Risk (IRDR-CHINA), and Doctoral fund of Henan Polytechnic University(Grant No B2015-58).] 作者简介（Biography）：贺拿，男，1984年生，博士，主要从事山地灾害及其动力过程方面的研究工作。 [He Na, male, (1984-),doctor, mainly focused on the research of mountain hazards and its dynamic process. ] E-mail:hn61886@163.com
更新日期/Last Update: 1900-01-01