深埋隧洞饱和原状Q_2黄土三轴剪切特性试验
Test on triaxial shear properties of saturated undisturbed Q_2 loess in deep-buried tunnel
查看参考文献15篇
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文摘
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为进一步探讨饱和原状Q_2黄土在三轴应力状态下的变形、孔隙水压力变化以及强度特性,利用GDS多功能三轴仪,对甘肃引洮输水工程15#隧洞原状黄土进行了常规三轴不排水剪切试验.通过对试验数据的整理与分析发现:在常规三轴不排水剪切试验下,原状Q_2黄土的应力-应变曲线呈应变软化型,表现为脆性破坏;随着围压的增大,曲线的软化性状减弱;在土的峰值强度出现前,变形几乎近似"弹性".土在剪切过程中产生正孔隙水压力,曲线在低围压下具有峰值压力,变化似软化型;在高围压下孔隙水压力随着轴向应变的增加而增大.随着围压的增大,原状Q_2黄土的破坏应力随之提高,有效应力路径曲线形态呈相似的直线形. |
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其他语种文摘
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With a GDS multifunctional triaxial apparatus,the conventional consolidated undrained triaxial shear tests were carried out to study the effects of deformation,changes of pore-water pressure and properties of strength of saturated undisturbed Q_2 loess in the fifteenth tunnel of Yintao water transmission project in Gansu province.Based on scientific interpretation and analysis of test data,the stress-strain curve of saturated undisturbed Q_2 loess under a conventional consolidated undrained triaxial shear test showed a strain softening, while the failure model displayed brittle failure.The softening behavior of the stress-strain curve had a trend of attenuation with the increase of confining pressure,and the strain before the peak was approximately elastic. During the process of shear test,the pore-water pressure was positive.Under lower confining pressure,the porewater pressure curve had peak value and the shape of pore-water pressure curve looked like softening.While the pore-water pressure under a larger confining pressure increased with an increasing axial strain.It was also shown that the strength of undisturbed Q_2 loess would increase with the confining pressure and the breaking stress of loess would augment with it.The curve of the effective stress path had a similar linear shape. |
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来源
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兰州大学学报. 自然科学版
,2012,48(3):23-27,33 【核心库】
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关键词
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土力学
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Q_2黄土
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三轴剪切
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应变软化
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孔隙水压力
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强度
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地址
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兰州大学土木工程与力学学院, 西部灾害与环境力学教育部重点实验室, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0455-2059 |
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学科
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建筑科学 |
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基金
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国家科技支撑计划项目
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文献收藏号
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CSCD:4589858
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参考文献 共
15
共1页
|
|
1.
Derbyshire E.
Landslides in the loess terrain of northwest China,2000:131-159
|
被引
4
次
|
|
|
|
|
2.
方祥位. 原状Q_2黄土三轴剪切特性.
岩石力学与工程学报,2008,27(2):383-389
|
被引
14
次
|
|
|
|
|
3.
陈存礼. 考虑结构性影响的原状黄土本构关系.
岩土力学,2007,28(11):2284-2290
|
被引
18
次
|
|
|
|
|
4.
陈正汉. 膨胀土和黄土的细观结构及其演化规律研究.
岩土力学,2009,30(1):1-11
|
被引
54
次
|
|
|
|
|
5.
李大展. Q↓2黄土大面积浸水试验研究.
岩土工程学报,1993,15(2):1-11
|
被引
32
次
|
|
|
|
|
6.
Fredlund D G.
Soil mechanics for unsaturated siols,1993:277-279
|
被引
1
次
|
|
|
|
|
7.
Bishop A W. The use of pore pressure coefficient in practice.
Geotechnique,1954,4(4):148-152
|
被引
16
次
|
|
|
|
|
8.
张豫川. 基于湿陷性和震陷性的黄土微结构.
兰州大学学报: 自然科学版,2011,47(2):72-76
|
被引
5
次
|
|
|
|
|
9.
Bianchini G. Complex stress paths and validation of constitutive models.
Geotechnical Testing Journal,1991,14(1):13-25
|
被引
1
次
|
|
|
|
|
10.
宋丙辉. 甘肃舟曲泄流坡滑坡滑带土的抗剪强度特性.
兰州大学学报: 自然科学版,2011,47(6):7-12
|
被引
15
次
|
|
|
|
|
11.
Mitchell J K.
Fundamentals of soil behavior,2005:411-414
|
被引
1
次
|
|
|
|
|
12.
Skempton A W. The pore pressure coefficients A and B.
Geotechnique,1954,4(4):143-147
|
被引
79
次
|
|
|
|
|
13.
Law K T. A note on Skempton’s A parameter with rotation of principal stresses.
Geotechnique,1978,28(1):57-64
|
被引
2
次
|
|
|
|
|
14.
黄文熙.
土的工程性质,1983:291-294
|
被引
1
次
|
|
|
|
|
15.
Wood D M.
Soil behaviour and critical state soil mechanics,1990:175-179
|
被引
1
次
|
|
|
|
|
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