Crack spacing of unsaturated soils in the critical state

作     者：SUN JiChao WANG GuangQian SUN QiCheng 

作者机构：State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2009年第54卷第12期

页      面：2008-2012页

核心收录：

学科分类：08[工学] 081402[工学-结构工程] 080104[工学-工程力学] 081304[工学-建筑技术科学] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by the National Natural Science Foundation of China(Grant No.50709015) China Postdoctoral Science Special Foundation(Grant No.200801081) China Postdoctoral Science Foundation(Grant No.20070410531) National Basic Research Program of China(Grant No.2007CB714100) 

主　　题：裂缝间距 非饱和土 临界状态 开裂机理 应力分析 实验数据 蒸发量 泊松比 

摘      要：The cracking mechanism of unsaturated soils due to evaporation is poorly understood, and the magnitude of crack spacing is usually hard to estimate. In this work, cracks were postulated to occur succedently rather than simultaneously, that is, secondary cracks appear after primary cracks as evaporation continues. Formulae of the secondary crack spacing and secondary trend crack spacing were then derived after stress analysis. The calculated spacing values were consistent with the published experimental data. Meanwhile, the effect of the Poisson ratio on the crack spacing was analyzed, which showed that the magnitude of crack spacing was proportional to the Poisson ratio in the range of [0.30, 0.35].