积水入渗稳定时近饱和土中封闭气泡含量 试验研究

吴争光; 张 华

积水入渗稳定时近饱和土中封闭气泡含量试验研究 English Version

吴争光¹,
张华²

1. 深圳市岩土工程有限公司，广东深圳 518028; 2. 三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002

详细信息

作者简介:
吴争光 (1985 – ) ，男，硕士，主要从事非饱和渗流和边坡稳定性分析、基坑支护设计与研究工作。

中图分类号: TU411
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出版历程
- 收稿日期: 2010-12-07
- 发布日期: 2012-02-19

Experimental study on entrapped air content in quasi-saturated soil subjected to steady ponded water infiltration

WU Zheng-guang¹,
ZHANG Hua²

1. Shenzhen Geotechnical Engineering Co., Ltd., Shenzhen 518028, China; 2. China Three Gorges University, Key Laboratory of Geological Hazards on Three Gorges Reservoir Area , Ministry of Education , Yichang 443002, China

摘要

摘要: 含有与大气不相连通的封闭气泡且饱和度接近 100% 的土体称为近饱和土体。通过室内土柱一维积水入渗模型试验，研究了入渗稳定时土壤类型、干密度和初始含水率对近饱和土体中封闭气泡的含量以及气相逸出率的影响，分析了 3 种影响因素对封闭气泡体积的影响趋势和影响机理。试验结果表明：土样孔隙中封闭气泡的体积随土样干密度的增大而减小；当土样初始含水率超过某一临界含水率时，土样孔隙中封闭气泡的逸出随初始含水率的增加显著减少；由于黏性土达到渗流稳定需要的时间较砂性土长，因而砂性土的气相逸出率要明显小于黏性土的气相逸出率。通过试验揭示了实际土体入渗中的一些物理现象，为更好地理解土壤入渗过程和建立数值模拟模型提供了试验数据。
- 近饱和土 /
- 封闭气泡 /
- 积水入渗 /
- 试验研究
Abstract: The quasi-saturated soil is defined as a soil with entrapped air and saturation close to 100%. A series of one-dimensional ponded water infiltration tests are designed and conducted in laboratory. The influence factors of entrapped air content in the quasi-saturated soil, such as soil types, dry density and the initial water content, are studied. The influence mechanisms are analyzed and discussed. The results show that the volume of entrapped air decreases as dry density increase; the escape of entrapped air is more difficult when the initial water content increases above a critical water content; the escape ratio of entrapped air in sand is smaller than that in clay because of the relatively longer time to reach stable state of infiltration for the clay. Some physical phenomena in real soil infiltration are shown. The results provide test data for better understanding of soil infiltration process and numerical modelling.
- quasi-saturated soil /
- entrapped air /
- ponded water infiltration /
- experimental study

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参考文献(9)

[1]	雷志栋 , 杨诗秀 , 谢森传 . 土壤水动力学 [M] . 北京 : 清华大学出版社 , 1988 . (LEI Zhi-dong, YANG Shi-xiu, XIE Sen-chuan. Soil water dynamics[M]. Beijing: Tsinghua University Press, 1988. (in Chinese))
[2]	CONSTANTZ J, HERKELRATH W N, MURPHY F. Air encapsulation during infiltration[J]. Soil Science Society of America Journal, 1988, 52 : 10 – 16.
[3]	JAOUDAT Touma, MICHEL Vauclin . Experimental and numerical analysis of two-phase infiltration in partially saturated soil[J]. Transport in Porous Media, 1986, 1 : 27 – 55.
[4]	SAKAGUCHI A, NISHIMURA T M Kato. The effect of entrapped air on the quasi-saturated soil hydraulic conductivity and comparison with the unsaturated hydraulic conductivity[J]. Vadose Zone Journal, 2005, 4 : 139 – 144.
[5]	李援农 . 不同灌溉方式入渗条件下的土壤空气阻渗特性试验研究 [D]. 西安 : 西安理工大学 , 2007. ( LI Yuan-nong . Study on soil air reduction infiltration characteristics under different irrigation method[D]. Xi'an: Xi'an University of Technology, 2007. (in Chinese))
[6]	张华 , 吴争光 . 封闭气泡对土壤渗透性影响的研究进展 [J]. 三峡大学报 ( 自然科学版 ), 2009, 31 (4): 52 – 56. (ZHANG Hua, WU Zheng-guang. Review on the effect of entrapped air on soil permeability[J]. Journal of China Three Gorges University (Natural Sciences), 2009, 31 (4): 52 – 56. (in Chinese))
[7]	张华 , 吴争光 . 封闭气泡对一维积水入渗影响的试验研究 [J]. 岩土力学 , 2009, 30 ( 增刊 ): 132 – 137. (ZHANG Hua, WU Zheng-guang. Experimental study on the effect of entrapped air on one-dimensional ponded water infiltration[J]. Rock and Soil Mechanics, 2009, 30 (S0): 132 – 137. (in Chinese))
[8]	HONIG J A, MURPHY J A. Antecedent water content and air encapsulation effects on physical properties of sand root zone material[J]. Journal of Turfgrass Science, 2001, 77 : 24 – 37.
[9]	包承纲 . 非饱和压实土的气相形态及其与孔隙压力消散的关系 [C]// 第五届土力学及基础工程学术会议论文选集 . 北京 : 工业出版社 , 1979. (BAO Cheng-gang. The air form in compressed unsaturated soil and its relationship to pore water pressure dissipation[C]// The 5th Conference on Soil Mechanics and Foundation Engineering. Beijing: Industry Press, 1979. (in Chinese))