陇东黄土湿陷过程的CT结构变化研究

Research on CT structure changing for damping process of loess in Longdong

摘要: 已经用多种方法进行了黄土的湿陷性研究,由于研究方法的限制,只能在试验前后推导试验现象,人们比喻为‘黑匣子’。计算机断层扫描仪(CT)是一种无损、定量检测方法,通过对黄土在单轴、三轴、渗水及其综合作用条件下进行的CT扫描和初步图像分析,看到在达到破坏应力前,黄土裂隙自缺损处开始扩大,其发展速率随试验条件而变;水分沿着毛细孔道渗入并扩展,计算出渗水速率及渗水量。通过对CT扫描辅助装置的改造和与计算机图像处理系统的联网,实现了CT图像的彩色显示,纠正了扫描过程的数据偏差,为数据图像的深入处理提供了基础

Abstract: The CT techonology has been used on frozen soil,ice,some stones and cement mortar.It can open the“black box”of experiment process.Because of nondestruction and quantization,the images have been changed to PC Images.From these images,the change of density and water content can be caught in experiment process of undisturbed state loess.The structure and specific property of loess would be exposed in many tests.