首页 | 官方网站   微博 | 高级检索  
     

非饱和土毛细滞回内变量模型的修正
引用本文:李幻,韦昌富,颜荣涛,曹华峰.非饱和土毛细滞回内变量模型的修正[J].岩土力学,2010,31(12):3721-3726.
作者姓名:李幻  韦昌富  颜荣涛  曹华峰
作者单位:1. 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点试验室,武汉,430071;华北水利水电学院,资源与环境学院,郑州,450011
2. 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点试验室,武汉,430071
基金项目:国家自然科学基金(No. 19872211);中国科学院岩土力学与工程国家重点项目(No. Q110601);中科院“百人计划”择优支持项目。
摘    要:土-水特征关系是基质吸力和含水率之间关系。在反复干湿循环路径下土-水特征曲线呈现出毛细滞回特性。基于毛细滞回内变量理论和传统的土-水特征关系经验模型,提出了能模拟在任意干湿循环路径下土-水特征关系的修正模型。该模型比原模型增加了一个可逆参数,考虑了含水率的可逆变化,使扫描线在靠近边界线的时候斜率不会无限大,同时保留了原模型精度。通过与文献中的试验结果进行比较,修正模型可以更好地模拟非饱和土的土-水特征关系的循环滞回特性,并讨论了可逆参数的确定方法。

关 键 词:非饱和土  土-水特征曲线  滞回  内变量
收稿时间:2009-12-22

A modification for capillary hysteresis internal variable model of unsaturated soils
LI Huan,WEI Chang-fu,YAN Rong-tao,CAO Hua-feng.A modification for capillary hysteresis internal variable model of unsaturated soils[J].Rock and Soil Mechanics,2010,31(12):3721-3726.
Authors:LI Huan  WEI Chang-fu  YAN Rong-tao  CAO Hua-feng
Affiliation:1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. College of Resources and Environmental Science, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China
Abstract:Soil-water characteristic curve(SWCC) describes the relationship between suction and volumetric water content of unsaturated soil which are not one-to-one correspondence. This curve performs hydraulic hysteresis during arbitrary drying-wetting suction changes are applied to the material. Based on capillary hysteresis internal variable model and conventional soil-water characteristics theory of unsaturated soils, a modified model which can simulate soil-water characteristic relationship during arbitrary suction changes is proposed. This model increases one parameter compared with the capillary hysteresis internal variable model, which describes the reversible changes of water content and ensures the slope of scanning curve not to be infinite when scanning curves approach the boundary of SWCC. The modified model retains the precision of the capillary hysteresis internal variable model simultaneously. Compared with experimental results in references, this model is able to simulate soil-water characteristics relationship of unsaturated soils better than the capillary hysteresis internal variable model. Determination method of the new parameter is also discussed.
Keywords:unsaturated soils  soil-water characteristic curve  hysteresis  internal variable
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《岩土力学》浏览原始摘要信息
点击此处可从《岩土力学》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号