|
文摘
|
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. |
|
其他语种文摘
|
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. |
|
来源
|
兰州大学学报. 自然科学版
,2012,48(3):23-27,33 【核心库】
|
|
关键词
|
土力学
;
Q_2黄土
;
三轴剪切
;
应变软化
;
孔隙水压力
;
强度
|
|
地址
|
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
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0455-2059 |
|
学科
|
建筑科学 |
|
基金
|
国家科技支撑计划项目
|
|
文献收藏号
|
CSCD:4589858
|
了解气象卫星更多信息，请访问