黄土滑坡不同发育阶段滑带土微结构变化研究

项目名称： 黄土滑坡不同发育阶段滑带土微结构变化研究

项目编号： No.41202187

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 谷天峰

作者单位： 西北大学

项目金额： 24万元

中文摘要： 针对不同发育阶段黄土滑坡滑带土的微结构变化规律这一科学问题，以黑方台黄土滑坡群为研究对象,在不同发育阶段（未动、蠕动及滑动阶段）的黄土滑坡上采集滑带黄土样品，采用显微CT、激光扫描共焦显微镜技术获取滑带土及同层位原状黄土的三维图像，定性、定量地分析孔隙、颗粒在三维空间的分布状态，以这些图像为基础结合扫描电镜照片研究不同发育阶段黄土滑坡滑带土孔隙大小、分布以及土颗粒集合体的空间分布与联结的变化规律，探索微结构参数与滑坡发育阶段的关系。本申请思路与前人研究成果相比，其最大的特点在于：在三维空间研究黄土孔隙、颗粒分布，用表面粗糙度、纹理指数等综合指标描述滑面表面形态，在此基础上分析不同发育阶段滑带土的微结构特征。本研究对黄土滑坡机理研究、稳定性评价、监测预报以及防治具有重要的理论意义和应用价值。

中文关键词： 黄土滑坡；滑带土；微结构；发育机制；

英文摘要： Aiming at solving the problems of microstructure features of loess slip zone in different developmental stages of loess landslides, Heifangtai Landslides in Gansu Province of China has been chosen as the research region. Being typical irrigation triggered landslides, the landslides receive much concern and are seen as natural validation site for landslide study. Firstly, based on engineering geology survey, digging exploratory wells, we will collect undisturbed slide zone samples in different developmental stages of loess landslides. Secondly, 2D and 3D images of loess slide zone are to be gained by a series of advanced testing technology such as SEM, Micro-CT and LSCM. Digital image processing techniques will be used to analyze micro-porous structure which includes image enhancement, image segmentation and feature extraction and so on. Characteristics of the pore distribution and spatial distribution of granular soils at different levels will be analyzed. Finally, this research attempts to measure the microstructure including the size and shape, spatial arrangement and distribution, contacting and concatenating way, then tries to find out developmental stages of loess landslides among them. The research's greatest characteristic lies in that we are going to study the loess microstructure in three-dimensional

英文关键词： Loess Lansslide；Slip Soil；Microstructure；Developmental Mechanism；