工程地质学报2016，Vol.24Issue(5)：856-862,7.DOI:10.13544/j.cnki.jeg.2016.05.015
干湿循环条件下重塑膨胀土的裂隙发育特征及量化研究
QUANTIFING DESICCATION CRACK BEHAVIOUR OF REMOLDED EXPANSIVE SOIL DURING WETTING-DRYING CIRCLES
摘要
Abstract
Desiccation cracking is one of the typical engineering geological characteristics of expansive soil and has a major impact on engineering properties of expansive soils.It can lead to many engineering geological problems directly or indirectly.After indoor wetting-drying circle tests on remolded expansive soil,obtained crack digital images are disposed by a series of pre-processing operations with the image processing technique.A series of parameters are propose to describe the morphological structure of the desiccation crack pattern quantitatively.It includes the crack ratio of surface,crack number,total crack length,average crack width and absolute shrinkage ratio.And the impact of wetting-drying circles on characteristics of expansive soil crack development are analyzed. The results show that wetting-drying cycles and moisture content are some significant factors affecting the development of expansive soil desiccation cracks.With decreasing moisture content,there is an increasing trend of the development of remolded expansive soil cracks overall.The surface crack ratio,number of cracks and total length increase with decreasing moisture content and absolute shrinkage ratio grows greater,but there is no obvious regularity between average crack width and water content.Desiccation cracks develop further with increasing wetting-drying circles and the numbers of cracks,total crack length and surface crack ratio increase,and absolute shrinkage ratio increases in the mass.Nevertheless,there is a reduced phenomenon on average crack width,which is related to the development of micro-cracks later.关键词
膨胀土/干湿循环裂隙/数字图像处理/定量分析Key words
Expansive soil/Wetting-drying cycle/Desiccation crack digital image processing/Quantitative analysis分类
天文与地球科学引用本文复制引用
冷挺,唐朝生,施斌..干湿循环条件下重塑膨胀土的裂隙发育特征及量化研究[J].工程地质学报,2016,24(5):856-862,7.基金项目
优秀青年科学基金项目（41322019），国家自然学科基金项目（41572246），国家自然科学基金重点项目（41230636），中央高校基本科研业务费专项资金，“青蓝工程”资助． （）
