| 原状Q2黄土CT-三轴浸水试验研究 |
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| 引用本文： | 方祥位,申春妮,陈正汉,张伟. 原状Q2黄土CT-三轴浸水试验研究[J]. 土木工程学报, 2011, 0(10): 98-106 |
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| 作者姓名： | 方祥位 申春妮 陈正汉 张伟 |
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| 作者单位： | 后勤工程学院;重庆科技学院; |
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| 基金项目： | 中国博士后科学基金(20100480675); 重庆市自然科学基金(2009BB6174); 后勤工程学院学术创新项目(YZ11-42201) |
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| 摘 要： | 利用后勤工程学院研制的CT-多功能土工三轴仪,研究非饱和原状Q2黄土三轴浸水变形特性,并在浸水过程中利用CT技术对内部结构的变化进行无损的量测,得到内部结构演化的CT图像和相应的CT数据,从细观上解释了三轴浸水过程。基于CT数据定义结构性参数和结构演化变量;分析浸水过程中结构演化变量与净围压、偏应力和吸力的关系,浸水前的固结净围压、偏应力和吸力越大,浸水过程中结构演化越快。建立非饱和原状Q2黄土三轴浸水过程的结构演化方程,该方程为结构演化变量与偏应变、体应变和饱和度增量的关系,能同时反映净围压、偏应力和吸力等对结构演化的影响。利用提出的结构演化方程对试验数据进行拟合,拟合结果较理想。CT技术使土的细观结构研究达到定量阶段,为建立土的结构演化方程和结构性本构模型提供了试验基础。
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| 关 键 词： | Q2黄土 三轴浸水试验 CT 细观结构 结构演化方程 |
Triaxial wetting tests of intact Q_2 loess by computed tomography |
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| Fang Xiangwei Shen Chunni Chen Zhenghan Zhang Wei. Triaxial wetting tests of intact Q_2 loess by computed tomography[J]. China Civil Engineering Journal, 2011, 0(10): 98-106 |
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| Authors: | Fang Xiangwei Shen Chunni Chen Zhenghan Zhang Wei |
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| Affiliation: | Fang Xiangwei1 Shen Chunni2 Chen Zhenghan1 Zhang Wei1(1.Logistical Engineering University,Chongqing 401311,China,2.Chongqing University of Science and Technology,Chongqing 401331,China) |
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| Abstract: | A series of CT triaxial wetting tests of an intact unsaturated Q2 loess were conducted using a CT multi-function triaxial apparatus developed at the Logistical Engineering University.Behavior of deformation of intact Q2 loess upon wetting was studied.The distinctive CT images and detailed CT data were obtained during nondestructive wetting of the loess.The CT data were employed to define a parameter and an evolution variable to characterize evolution of the meso-structure.Relationships among the evolution v... |
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| Keywords: | Q2 loess triaxial wetting test computed tomography(CT) meso-structure evolution equation of structure |
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