粘粒含量对泥石流源区砾石土体强度影响的试验研究

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 成都山地所知识仓储（2009年以前）

题名	粘粒含量对泥石流源区砾石土体强度影响的试验研究
作者	杨成林
学位类别	硕士
答辩日期	2008
授予单位	中国科学院水利部成都山地灾害与环境研究所
授予地点	成都
导师	陈宁生
关键词	泥石流砾石土粘粒含量最大剪应力孔隙水压力
其他题名	Experimental Study on the influence of the clay content to the gravelly soil from upstream area of debris flow
学位专业	自然地理学
中文摘要	泥石流源区砾石土的粘粒颗粒含量对砾石土强度和孔隙水压力的影响是泥石流形成机理中的重要问题之一。本文采用室内静三轴试验的方法来研究砾石土体强度、孔隙水压力与粘粒颗粒含量的关系，寻找在与野外情况相似的条件下最有利于土体强度降低的粘粒含量。通过对野外泥石流启动机理以及试验结果的分析，以固结排水剪切条件下剪应力与粘粒含量的关系为基础，结合前期完成的野外人工降雨试验的数据，统计分析得出砾石土体强度与粘粒含量关系。试验取得了如下的结论： (1) 在室内三轴试验中，粘粒含量在3.75％-7. 50％范围内砾石土试样湿陷性较大；尤以粘粒含量为5.00％左右的砾石土湿陷性最大。 (2) 在室内三轴试验中，粘粒含量在3.25-7. 50％范围内砾石土试样在剪切过程中孔压上升较高，尤以粘粒含量为6. 25％的试样孔压上升的幅度最高。 (3) 在室内三轴试验中，中等粘粒含量(3. 75％-7. 50％)的砾石土强度较低，尤其是粘粒含量5％的砾石土强度最低，在相同条件下最容易被破坏。 (4) 中等粘粒含量(3. 75％-7.50％)的砾石土，在相同降雨和坡度等条件下，最易启动暴发规模较大、破坏性较强的泥石流。以上试验成果适用于云南东川蒋家沟支沟-大凹子沟源区的砾石土，其他地区砾石土是否拥有这一性质还有待于更多试验来验证。
英文摘要	In order to find out the relationship between the clay contents and the intensity, the pore water pressure of the gravelly soil, the candidate was screened out the granules that less than 2 mm in the gravelly soil, and then did the screen analysis. The granules ware put back into the gravelly soil equably to confected nine types of the gravelly soil for the test. The clay contents were 1%, 2.5%, 3.75%, 5%, 6.25%, 7.5%, 10%, 12.5%, 15%.Then the each sample of different clay contents were did the unconsolidated-undrained triaxial test (UU) and consolidated drained triaxial test (CD). The conclusion of the experiment was based on the consolidated drained triaxial test (CD) and the artificial rainfall experiment which was finished before. The following are the conclusion of this experiment: 1. When the clay contents is 3.75%-7.5%, the collapsibility of the sample is greater; especially 5% is the maximal. 2. When the clay contents is 3.75%-7.5%, the pore water pressure of the sample has the greater increment, especially 5% is the maximal. 3. When the clay contents is 3.75%-7.5%, the sample has the inferior intensity, and the gravelly soil of 5% clay contents is the easiest to demolish. 4. In the same condition of rainfall and gradient, the gravelly soil of 3.75%-7.5% clay contents is most likely to motivate a devastating debris flows of large scale. The above-mentioned conclusions are based on the samples from Jiangjia Ravine, Dongchuan, Yunnan province. More experiments are needed to prove if gravelly soil in other area has similar adaptability.
语种	中文
学科主题	灾害学
公开日期	2010-10-14
分类号	P64;TU4
内容类型	学位论文
源URL	[http://ir.imde.ac.cn/handle/131551/2187]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）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
推荐引用方式 GB/T 7714	杨成林. 粘粒含量对泥石流源区砾石土体强度影响的试验研究[D]. 成都. 中国科学院水利部成都山地灾害与环境研究所. 2008.