Soil water characteristics of expansive soil considering the effects of drying and wetting cycles and volume change under dehydration path

被引：0
|
作者：
Fang J. [1 ]
Xue T. [1 ]
Yang X. [1 ]
Yu J. [1 ]
Zhang J. [1 ]
Feng Y. [2 ]
机构：
[1] School of Civil Engineering, Henan Polytechnic University, Henan, Jiaozuo
[2] Infrastructure Department, Henan Polytechnic University, Jiaozhuo, Henan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷 / 08期
基金：
中国国家自然科学基金;
关键词：
dehydration; drying and wetting cycles; soil mechanics; soil water characteristics; true triaxial apparatus; volume change;
D O I：
10.13722/j.cnki.jrme.2021.1097
中图分类号：
学科分类号：
摘要：
A set of dehydration tests of weakly expansive soils experienced different drying and wetting cycles were carried out by using the improved true triaxial apparatus for unsaturated soil to investigate the influence of drying and wetting cycle and volume change on soil water characteristic curve of expansive soil, and the water content and void ratio after each stage of dehydration were measured. The results show that with the increase of drying and wetting cycle, the pore ratio increases after saturation and decreases after dehumidification. The water content and void ratio of expansive soils after drying and wetting decrease with an increase in suction. Under the increasing of matric suction, the curves of the water content and the degree saturation with suction appear cross phenomenon, and the void ratio and suction curves appear cross-convergence phenomenon. With the increase of drying and wetting cycle, the volumetric moisture content and degree of saturation of expansive soils after dehydration decrease, which reflects the coupling effect of soil water characteristics and volume change of expansive soils after drying and wetting cycles. Based on Fredlund-Xing model, a SWCC equation expressed by the water content considering the influence of drying and wetting cycle is constructed, and the volume change equation of expansive soils considering the influence of drying and wetting cycles is established. Finally, the SWCC equation expressed in degree of saturation considering the effects of drying and wetting cycles and volume change is obtained. These three models can well describe the change rules of the water content, the void ratio and the degree of saturation of expansive soils after different drying and wetting cycles. © 2022 Academia Sinica. All rights reserved.
引用
收藏
页码：1671 / 1679
页数：8
相关论文
共 25 条
  • [1] BARBOUR S L., Nineteenth Canadian Geotechnical Colloquium: the soil-water characteristic curve: a historical perspective[J], Canadian Geotechnical Journal, 35, 5, pp. 873-894, (1998)
  • [2] BAO Chenggang, Behavior of unsaturated soil and stability of expansive soil slope, Chinese Journal of Geotechnical Engineering, 26, 1, pp. 1-15, (2004)
  • [3] KONG Lingwei, CHEN Jianbin, GUO Aiguo, Et al., Field response tests on expansive soil slopes under atmosphere, Chinese Journal of Geotechnical Engineering, 29, 7, pp. 1065-1073, (2007)
  • [4] SUN Dean, MENG Delin, SUN Wenjing, Et al., Soil-water characteristic curves of two bentonites, Rock and Soil Mechanics, 32, 4, pp. 937-978, (2011)
  • [5] MIAO L C, FEI J, SANDRA L., Soil-water characteristic curve of remolded expansive soils[C], Proceedings of the Fourth International Conference on Unsaturated Soils, pp. 997-1004, (2006)
  • [6] KONG Lingwei, LI Xiongwei, GUO Aiguo, Et al., Preliminary study on engineering behaviors and water retention characteristics of expansive soil under influence of drying rate, Chinese Journal of Geotechnical Engineering, 31, 3, pp. 335-340, (2009)
  • [7] LIU Yanhua, GONG Biwei, SU Hong, Study on characteristic curve of soil and water for unsaturated soil, Geotechnical Investigation and Surveying, 3, pp. 8-11, (2002)
  • [8] ZOU Weilie, ZHANG Junfeng, WANG Xiequn, Volume change correction and soil-water characteristics of remodeling expansive soil under dehydration path, Chinese Journal of Geotechnical Engineering, 34, 12, pp. 2213-2219, (2012)
  • [9] ZHOU Baochun, KONG Lingwei, Effect of volume changes on soil-water characteristics of unsaturated expansive soil, Journal of Hydraulic Engineering, 42, 10, pp. 1152-1160, (2011)
  • [10] WU Junhua, YANG Song, Changes of matric suction in expansive soil under drying-wetting cycles using filter paper method[J], Transactions of the Chinese Society of Agricultural Engineering, 33, 15, pp. 126-132, (2017)
123