| 原状黄土损伤破坏过程的CT扫描分析 |
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| 引用本文： | 雷胜友,唐文栋,王晓谋,戴经樑.原状黄土损伤破坏过程的CT扫描分析[J].兰州理工大学学报,2004,30(4):110-114. |
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| 作者姓名： | 雷胜友 唐文栋 王晓谋 戴经樑 |
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| 作者单位： | 长安大学,公路学院,陕西,西安,710064;长安大学,公路学院,陕西,西安,710064;安徽省建筑科学研究设计院结构所,安徽,合肥,230001 |
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| 基金项目： | 国家自然科学基金(59479017)，陕西省自然科学基金(97C22，2001C01)，地质灾害防治与工程地质环境保护国家专业实验室开放基金(99007) |
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| 摘 要： | 进行了原状黄土的三轴剪切试验过程中的CT扫描,结合CT图像、数据与软化型应力 应变曲线的特点,对比分析土样的微观结构变化,认为由于围压没有超过结构强度的临界值,破坏表现为软化开裂破坏,是由轴向压密损伤为主导向横向开裂损伤为主导的转变过程;裂缝首先在结构强度较低的低密软弱大孔隙区域形成,随后衍生出一系列小裂缝,最终形成剪切面.
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| 关 键 词： | 黄土 结构强度 CT扫描 损伤变量 |
| 文章编号： | 1000-5889(2004)04-0110-05 |
| 修稿时间： | 2003年10月12 |
CT Scanning analysis of destruction process of orginal loess damage |
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| LEI Sheng-you,TANG Wen-dong.CT Scanning analysis of destruction process of orginal loess damage[J].Journal of Lanzhou University of Technology,2004,30(4):110-114. |
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| Authors: | LEI Sheng-you TANG Wen-dong |
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| Institution: | LEI Sheng-you~1,TANG Wen-dong~ |
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| Abstract: | CT scanning of three-axial shearing test for original loess is conducted.Microstructural change of loess samples are compared and analyzed by using the CT picture,data,and characteristics of softening-type stress-strain curve.It is preliminarily recognized that, because there is surrounding pressure over the critical value of structural strength,the destructional damage takes the form of softening cracking damage,being a conversion process of axial compression dampage as the primary into lateral cracking damage as the primary.The cracking takes place first at the location of lower structural strength in the area with low density softness,and large porosity,then serial small cracks are derived,and finally a shearing surface is formed. |
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| Keywords: | loess structural strength CT scanning damage variable |
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