Effects of dry density and initial water content on water retention of coral sand

被引：0

作者：

Wu H. ^{[1
,2
]}

Shen J. ^{[1
]}

Lei X. ^{[2
]}

Chen X. ^{[3
]}

Ding H. ^{[1
]}

Wang X. ^{[1
]}

机构：

[1] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, Wuhan

[2] College of Urban Construction, Wuhan University of Science and Technology, Hubei, Wuhan

[3] School of Civil Engineering, Tongji University, Shanghai

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2024年 / 43卷

基金：

中国国家自然科学基金;

关键词：

coral sand; nuclear magnetic resonance; pore water distribution; soil mechanics; water retention characteristics;

D O I：

10.13722/j.cnki.jrme.2023.1037

中图分类号：

学科分类号：

摘要：

In order to study the effects of dry density and initial water content on water retention of coral sand,soil-water characteristic curves of samples with different dry densities and initial water contents were tested and analyzed by pressure plate apparatus test,and the pore water distribution characteristics of samples under different suction forces were obtained by nuclear magnetic resonance technology. The results show that the air entry value of coral sand increases with the increase of dry density and decreases with the increase of initial water content. The residual water content increases with the increase of dry density and initial water content. In general,the samples with high dry density and initial water content have better water retention. The F‐X model has good applicability to soil-water characteristic curves of coral sand samples under different conditions. Dry density and initial water content have important effects on pore size distribution and water retention of compacted coral sand samples,but their effects on water retention gradually weaken with the increase of matric suction. At different suction stages,the effects of dry density and initial water content on water retention of coral sand were different. At 0–10 kPa,the initial water content was the main factor,while at 10–70 kPa,the dry density had a greater effect,and at 70–300 kPa,neither of them had a major effect on water retention of coral sand. The poor connectivity of coral sand pores results in large pores that can still store water under high suction,which enhances the water retention of coral sand to a certain extent. © 2024 Academia Sinica. All rights reserved.

引用

页码：3568 / 3577

页数：9

共 24 条

[1] GAO Ran, YE Jianhong, Experimental study on dynamic characteristics of calcareous sand in the South China Sea[J], Rock and Soil Mechanics, 40, 10, pp. 3897-3896, (2019)
[2] WANG X, WENG Y, WEI H, Et al., Particle obstruction and crushing of dredged calcareous soil in the Nansha Islands,South China Sea[J], Engineering Geology, 261, (2019)
[3] ZHAO Huanting, WANG Lirong, YUAN Jiayi, The natural environment , Resources and Development of Nanhai Zhudao — Commemorating the 70th anniversary of the recovery of Nanhai Zhudao by the Chinese Government(3)[J], Tropical Geography, 37, 5, pp. 659-680, (2017)
[4] CUI Xiang, ZHU Changqi, HU Mingjian, Et al., Study on microscopic mechanism of coral sand permeability[J], Chinese Journal of Geotechnical Engineering, 42, 12, pp. 2336-2341, (2020)
[5] HU Mingjian, ZHANG Chenyang, CUI Xiang, Et al., Experimental study on capillary water height and influencing factors in calcareous sand[J], Rock and Soil Mechanics, 40, 11, pp. 4157-4164, (2019)
[6] YIN Panpan, NIU Shengkuan, WEI Changfu, Effects of dry density and initial moisture content on soil-water characteristic curve of unsaturated remolded silt[J], Hydrogeology Engineering Geology, 39, 1, pp. 42-46, (2012)
[7] CHEN Yulong, TAIRO Uchimura, Soil-water characteristic curve of unsaturated soil under different dry densities[J], Journal of Central South University:Natural Science, 48, 3, pp. 813-819, (2017)
[8] LI Jiamin, MA Lina, CHANG Yongling, Et al., Effect of saturation and dry density on soil-water characteristic curve of weak expansive soil[J], Journal of Southwest University:Natural Science, 42, 4, pp. 142-148, (2020)
[9] GALLAGE C P K, UCHIMURA T., Effects of dry density and grain size distribution on soil-water characteristic curves of sandy soils[J], Soils and foundations, 50, 1, pp. 161-172, (2010)
[10] LI L, LI X A, WANG L, Et al., The effects of soil shrinkage during centrifuge tests on SWCC and soil microstructure measurements[J], Bulletin of Engineering Geology and the Environment, 79, pp. 3879-3895, (2020)

← 1 2 3 →