|
|
|
| EXPERIMENTAL RESEARCH ON IMMERSION FOR UNSATURATED INTACT LOESS SLOPE |
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Logistic Engineering
University of PLA，Chongqing 400041，China) |
|
|
|
|
Abstract It is a difficult research topic of the rule about water flow in the unsaturated intact loess；this subject develops slowly by now，owing to the complex theory and the lagging of experimental method. This article addresses the problems of temporary saturated zone and transport progresses of water in unsaturated intact loess slope. The authors analyze the variation regularities of daily moisture content of soil within the depth of 2–3 m beneath the immersion test pit，discuss the formation of transient saturated zone and migration process，canvass formation mechanism of infiltration regions in unsaturated intact loess slope and migration rules of water in unsaturated intact loess slope. The results show that the process of infiltration in the unsaturated loess slope is the process of continuously enlargement of transient saturated zone；permeability zones and the value of wetting angle are not fixed，and both enlargement as infiltration capacity of water increasing. Permeability zone could be divided into four parts：the first and second parts are the stage of water lateral migration；the third part is the stage of vertical permeability；the forth part is the wetting front of temporary saturated zone；permeability zone in the unsaturated loess would be closed region of approximate oval forever.
|
|
Received: 15 January 2011
|
|
|
|
| [1] 罗宇生. 湿陷性黄土地基评价[J]. 岩土工程学报，1998，20(4)：87–91.(LUO Yusheng. Assessment of collapsibility of collapsible loess foundation[J]. Chinese Journal of Geotechnical Engineering，1998，20(4)：87–91.(in Chinese))
[2] 谢定义. 试论我国黄土力学研究中的若干新趋向[J]. 岩土工程学报，2001，23(1)：3–13.(XIE Dingyi. Exploration of some new tendencies in research on loess mechanics [J]. Chinese Journal of Geotechnical Engineering，2001，23(1)：3–13.(in Chinese))
[3] 李大展，何颐华，隋国秀. Q2黄土大面积浸水试验研究[J]. 岩土工程学报，1993，15(2)：1–11.(LI Dazhan，HE Yihua，SUI Guoxiu. Study and test on immersion of Q2 loess in large area[J]. Chinese Journal of Geotechnical Engineering，1993，15(2)：1–11.(in Chinese))
[4] 谢绍忠. 积水入渗条件下土壤水分动态变化野外观测与分析[J]. 水土保持学报，1997，17(1)：7–12.(XIE Shaozhong. Field observation and analysis on dynamics of soil water content in the situation of ponding infiltration[J]. Journal of Soil and Water Conservation，1997，17(1)：7–12.(in Chinese))
[5] 汪国烈，明文山. 湿陷性黄土的浸水变形规律与工程对策[C]// 湿陷性黄土研究与工程. 北京：中国建筑工业出版社，2001：21–32.(WANG Guolie，MING Wenshan. Immersion deformation of collapse loess and engineering technologies[C]// Research and Engineering of Collapsed Loess. Beijing：China Architecture and Building Press，2001：21–32.(in Chinese))
[6] 孙玉龙. 用TDR快速确定非饱和土中水分的入渗锋面[J]. 灌溉排水，1998，(4)：43–46.(SUN Yulong. Determine moisture infiltration front in unsaturated soil fatly by TDR[J]. Chinese Journal of Irrigation and Drainage，1998，(4)：43–46.(in Chinese))
[7] MCDOUGALL J R，PYRAH I C. Simulating transient infiltration in unsaturated soils[J]. Canadian Geotechnical Journal，1998，35(10)：1 093–1 100.
[8] CHO S E，LEE S R. Instability of unsaturated soil slopes due to infiltration[J]. Computers and Geodetics，2001，28(3)：185–208.
[9] 刘保健，谢永利，于友成. 黄土非饱和入渗规律原位试验研究[J]. 岩石力学与工程学报，2004，23(24)：4 156–4 160.(LIU Baojian，XIE Yongli，YU Youcheng. In-situ testing study on infiltration in unsaturated loess[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(24)：4 156–4 160.(in Chinese))
[10] DAVID J B，PETER S. Fundamental of physical geography[M]. [S.l.]：Rowman and Littlefield，1986：288–289.
[11] FREDLUND D G，RAHARDJO H. 非饱和土土力学[M]. 陈仲颐，张在明，陈愈炯，等译. 北京：中国建筑工业出版社，1997：27–29.(FREDLUND D G，RAHARDJO H. Soil mechanics for unsaturated soils[M]. Translated by CHEN Zhongyi，ZHANG Zaiming，CHEN Yujiong，et al. Beijing：China Architecture and Building Press，1997：27–29.(in Chinese))
[12] 刘巍然. 压实黄土路基中含水量的分布及水分迁移规律研究[硕士学位论文][D]. 西安：长安大学，2004.(LIU Weiran. Research on moisture content distribution and laws of moisture migration of compacted loess[M. S. Thesis][D]. Xi?an：Chang?an University，2004.(in Chinese)) |
|
|
|
2011, Vol. 30 
