| 细粒含量对冰碛土抗剪强度影响的实验研究 |
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| 引用本文： | 蒋德旺,崔鹏,王姣,李战鲁,殷延洲,雷鸣宇.细粒含量对冰碛土抗剪强度影响的实验研究[J].冰川冻土,2019,41(1):129-139. |
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| 作者姓名： | 蒋德旺 崔鹏 王姣 李战鲁 殷延洲 雷鸣宇 |
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| 作者单位： | 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;中国科学院大学,北京100049;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;中国科学院青藏高原地球科学卓越创新中心,北京100101;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 |
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| 基金项目： | 国家自然科学基金国际合作与交流项目（41520104002）；中国科学院前沿科学重点研究项目（QYZDY-SSW-DQC006）资助 |
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| 摘 要： | 为研究细粒组颗粒在浸水/降雨条件下产生迁移对冰碛土抗剪强度的影响，从西藏林芝市帕隆藏布嘎隆寺沟流域内采取冰碛土样品，进行7种不同细粒（粒径小于2 mm）含量情况下的冰碛土比重和相对密度的测试，开展了不同围压下的大型饱和固结不排水三轴（CU）实验。结果表明：（1）细粒含量对干密度的影响较小，不同细粒含量的冰碛土孔隙比大致相同，细颗粒对孔隙具有改造作用，不同细粒含量会引起孔隙结构的差异，从而导致冰碛土的结构差异，最终导致抗剪强度的不同；（2）细颗粒迁移导致冰碛堤坡脚和内部一定深度细粒含量较高，达到一定的量值时，抗剪强度明显降低，冰碛堤容易发生剪切破坏；（3）细粒含量对抗剪强度参数的变化具有重要影响，从中还可以反映出冰碛土结构控制的变化：粗颗粒控制→粗细颗粒共同控制→细颗粒控制。研究结果对于评价冰碛堤的稳定性具有重要意义。
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| 关 键 词： | 细粒含量 冰碛土 颗粒迁移 抗剪强度 强度参数 冰碛土结构 |
| 收稿时间： | 2017-11-14 |
| 修稿时间： | 2018-01-17 |
Experimental study on the effect of shear strength of moraine soil with fine grain content |
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| JIANG Dewang,CUI Peng,WANG Jiao,LI Zhanlu,YIN Yanzhou,LEI Mingyu.Experimental study on the effect of shear strength of moraine soil with fine grain content[J].Journal of Glaciology and Geocryology,2019,41(1):129-139. |
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| Authors: | JIANG Dewang CUI Peng WANG Jiao LI Zhanlu YIN Yanzhou LEI Mingyu |
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| Institution: | 1.
CAS Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of
Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041,
China;
2.CAS Center for Excellence in
Tibetan Plateau Earth Sciences, Beijing 100101, China;
3.University of Chinese Academy of Sciences,
Beijing 10049, China) |
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| Abstract: | In
order to study the effect of migration of fine particles under flood/rainfall conditions on shear strength of moraine soil, moraine soil samples were collected
from the Galongsi Gully watershed in the Pallon Tsangpo, Nyingchi City, Tibet. Tests of specific gravity and relative density of
moraine soil under seven different fine grain (particle size less than 2 mm) content were carried out as well. Large-scale
saturated consolidated undrained（CU）triaxial test under different confining
pressures were also carried out. The results show that: (1) The effect of fine
particles on the dry density is small, the basic pore ratio of different grain
contents is basically same; the fine particles have the remodeling effect on the pore, and
different fine particles can cause difference in pore structure, leading to structure difference of
moraine soil, and eventually leading to different shear strength. (2) The migration of fine
particles leads to high content of fine particles in the slopes of the moraine
and in its internal,
which reaches a certain magnitude, the shear strength will obviously reduce and the moraine dam easy to shear failure; (3) The
content of fine particles has an important influence on the shear strength
parameters, reflecting the change of structure
control of moraine soil in such a way: coarse particle control→coarse and fine particle control together→fine particle control. The research results are helpful for
the stability evaluation of moraine dams. |
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| Keywords: | fine grain content moraine soil particle migration shear strength strength parameter moraine soil structure |
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