细粒含量对冰碛土抗剪强度影响的实验研究
Experimental study on the effect of shear strength of moraine soil with fine grain content
查看参考文献34篇
文摘
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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,并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。 |
其他语种文摘
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In order to study the effect of migration of fine grains 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 ( grain 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 grains on the dry density is small,the basic pore ratio of different grain contents is basically same; the fine grains have the remodeling effect on the pore,and different fine grains 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 grains leads to high content of fine grains 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 grains has an important influence on the shear strength parameters,reflecting the change of structure control of moraine soil in such a way: coarse grain control→coarse and fine grain control together→ fine grain control. The research results are helpful for the stability evaluation of moraine dams. |
来源
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冰川冻土
,2019,41(1):129-139 【核心库】
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DOI
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10.7522/j.issn.1000-0240.2019.0056
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关键词
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细粒含量
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冰碛土
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颗粒迁移
;
抗剪强度
;
强度参数
;
冰碛土结构
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地址
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1.
中国科学院/水利部成都山地灾害与环境研究所, 中国科学院山地灾害与地表过程重点实验室, 四川, 成都, 610041
2.
中国科学院大学, 北京, 100049
3.
中国科学院青藏高原地球科学卓越创新中心, 中国科学院青藏高原地球科学卓越创新中心, 北京, 100101
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-0240 |
学科
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建筑科学 |
基金
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国家自然科学基金国际合作与交流项目
;
中国科学院前沿科学重点研究项目
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文献收藏号
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CSCD:6443213
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参考文献 共
34
共2页
|
1.
郭朝旭. 宽级配弱固结土体内细颗粒迁移规律研究评述.
山地学报,2017,35(2):179-186
|
被引
7
次
|
|
|
|
2.
Lu X B. A study on water film in saturated sand.
International Journal of Sediment Research,2010,25(3):221-232
|
被引
2
次
|
|
|
|
3.
王志兵. 蒋家沟砾石土的特性及其对斜坡失稳的意义.
岩土力学,2010,31(增刊2):206-211
|
被引
6
次
|
|
|
|
4.
陈晓清. 滑坡转化泥石流起动的人工降雨试验研究.
岩石力学与工程学报,2006,25(1):106-116
|
被引
57
次
|
|
|
|
5.
陈晓清.
滑坡转化泥石流起动机理试验研究,2006
|
被引
5
次
|
|
|
|
6.
齐俊修. 细粒含量P_c<25%渗透变形类型为非管涌碎砾石的颗粒级配特征及判别方法.
冰川冻土,2016,38(4):977-981
|
被引
2
次
|
|
|
|
7.
Salgado R. Shear strength and stiffness of silty sand.
Journal of Geotechnical and Geoenvironmental Engineering,2000,126(5):451-462
|
被引
26
次
|
|
|
|
8.
Bobei D C. Modified state parameter for characterizing static liquefaction of sand with fines.
Canadian Geotechnical Journal,2009,46(3):281-295
|
被引
9
次
|
|
|
|
9.
Peters J F. Percolation threshold of sand-clay binary mixtures.
Journal of Geotechnical and Geoenvironmental Engineering,2010,136(2):310-318
|
被引
1
次
|
|
|
|
10.
Fuggle A R. Size effects on the void ratio of loosely packed binary particle mixtures.
Geocongress 2014 technical papers,2014:129-138
|
被引
1
次
|
|
|
|
11.
郭庆国.
粗粒土的工程特性及应用,1998
|
被引
102
次
|
|
|
|
12.
Miller E A. The strength characteristics of soil-aggregate mixtures.
Highway Research Board Bulletin,1957,183:16-23
|
被引
8
次
|
|
|
|
13.
Kawakami H. Shear characteristics of saturated gravelly clays.
Proceedings of the Japan Society of Civil Engineers,1970,183:55-62
|
被引
1
次
|
|
|
|
14.
Wang G. Pore-pressure generation and movement of rainfall-induced landslides: effects of grain size and fine-particle content.
Engineering Geology,2003,69(1/2):109-125
|
被引
20
次
|
|
|
|
15.
Vallejo L E. Interpretation of the limits in shear strength in binary granular mixt.
Canadian Geotechnical Journal,2001,38(5):1097-1104
|
被引
16
次
|
|
|
|
16.
李振. 干密度和细粒含量对砂卵石及碎石抗剪强度的影响.
岩土力学,2006,27(12):2255-2260
|
被引
19
次
|
|
|
|
17.
李君. 不同细粒含量下粗砂的强度特性试验研究.
土工基础,2016,30(6):721-725
|
被引
1
次
|
|
|
|
18.
王保亮. 降雨作用下土体细颗粒迁移特征及其对崩塌的影响.
工程科学与技术,2017,49(增刊2):43-53
|
被引
2
次
|
|
|
|
19.
何正贵. 墨脱公路自然环境与山地灾害.
地质灾害与环境保护,2003,14(1):28-31
|
被引
1
次
|
|
|
|
20.
南京水利科学研究院.
土工试验规程: SL 237-1999,1999
|
被引
5
次
|
|
|
|
|