岩土CT技术在评价膨润土裂缝自愈性能研究中的应用
摘要:以含裂缝压实膨润土试样为研究对象进行给水愈合实验,利用计算机截面成相技术(CT)对试样截面进行扫描,观察试样裂缝细观结构的变化,以揭示膨润土裂缝的自愈合性能。研究采用裂缝区和对照区划分方案,通过CT数、CT方差和CT图像的对比,分析裂缝区域及对照区域的土体CT特征。结果显示,在侧限条件下,膨润土吸水膨胀,内部孔洞缩小、闭合,膨润土横向、纵向裂缝区域的宏观裂缝消失,无连通性孔隙存在,从微观形貌角度证实了膨润土裂缝具有良好的自愈合性能。同时,裂缝区域平均CT数小于对照区,CT数方差大于对照区,显示出初始裂缝对愈合后试样的结构仍有一定程度的影响。
Abstract:After Penetration test, computerized tomography was carried on to evaluate the self-healing performance of compacted bentonite. By contrasting the CT number, CT variance and CT images of the fracture zone and the control zone in cross-section to analyse the CT characteristics in soil. The results showed that under confined conditions, the soil expanded upon imbibing water, internal voids narrowed, macro cracks and connectivity pores disappeared. Meanwhile, CT number of the fracture zone was lower than the control zone, CT variance was on the contrary. All the data above showed that the compacted bentonite has good self-healing performance, although fracture has certain influence on structure of healed samples.
中文标题：
岩土CT技术在评价膨润土裂缝自愈性能研究中的应用
Application of Computerized Tomography in Evaluation on Self-healing Performance of Compacted Bentonite
作者：
陈洁,张永浩,沈忠
Chen Jie,Zhang Yonghao,Shen Zhong
作者简介:陈洁,1985年生,女,汉族,黑龙江伊春人,工程师,主要从事环境地质研究。E-mail:chenjie1234@yahoo.cn
通讯地址：
西北核技术研究所, 陕西西安 710024
NorthwestInstituteofNuclearTechnology,Xi'an,710024,Shaanxi,China
中图分类号:P631.325
doi:10.3969/j.issn.1007-2993.2013.04.010
出版物：岩土工程技术
收稿日期:2013-05-06
关键词:压实膨润土,裂缝,岩土CT
Key words:compacted bentonite,fracture,computerized tomography
文档包含图片数量：图片(0)张
文档包含表格数量：表格(0)个
参考文献：
基金项目：
- 文件大小:
- 4.64 MB
- 下载次数:
- 60
-
高速下载
|
