非饱和土土水特征曲线(SWCC)测试与预测

李志清; 李涛; 胡瑞林; 李熊; 李壮举

非饱和土土水特征曲线(SWCC)测试与预测

1.
中国科学院地质与地球物理研究所工程地质力学重点实验室,北京100029;
2.
北京交通大学,北京100044;
3.
湖南百利工程科技有限公司,岳阳414000;
4.
北京双圆工程咨询监理有限公司,北京100022

基金项目:

973项目(No.2002CB412702);;国家自然科学基金项目(No.50579002)资助.

详细信息

作者简介:
李志清,主要从事非饱和特殊土方面的研究.Email:lizhiq-2002@sohu.com

中图分类号: P642.116
计量
- 文章访问数: 5009
- HTML全文浏览量: 533
- PDF下载量: 1056
- 被引次数: 0
出版历程
- 收稿日期: 2006-09-04
- 修回日期: 2006-10-26
- 刊出日期: 2007-09-29

METHODS FOR TESTING AND PREDICTING OF SWCC IN UNSATURATED SOIL MECHANICS

1.
Institute of Geology and Geophysics, Key laboratory of Engineering Geomechanics, Chinese Academy of Sciences, Beijing 100029;
2.
Beijing Jiaotong University, Beijing 100044;
3.
Baili Engineering Technology Limited Company of Hunan, Yueyang 414000;
4.
Beijing Shuangyuan Engineering Consultation Surveillance Ltd., Beijing 100022

摘要

摘要: 非饱和土土水特征曲线(SWCC)表示了土中含水量与吸力之间的关系。文章介绍了6种常用方法,各有其适用范围。体积压力板仪可量测最大基质吸力值为1500kPa的干燥曲线和浸湿曲线;超过1500kPa时,可用盐溶液法进行量测;Tem-ple仪可量测基质吸力达100kPa的干燥曲线;滤纸法可用于测量土体的基质吸力与总吸力;Dew-point电位计可用于量测土样总吸力变化,尤其适合渗透吸力的量测;TDR探头适合于量测小于300kPa的基质吸力。用GDS非饱和土三轴仪可以进行SWCC测试,测试范围主要取决于陶土板的进气值。用准确的数学模型对测得的含水量、吸力数据进行拟合,对于预测非饱和土力学性质、渗透系数、抗剪强度及分析边坡稳定性有重要意义。由于准确测试SWCC难度较大,并且测试影响因素较多,所以根据土体孔隙大小分布和颗粒大小分布情况预测SWCC,也是一种较好的方法。
- 非饱和土 /
- 土水特征曲线 /
- 数学模型
Abstract: Soil-water characteristic curve (SWCC) in unsaturated soil mechanics presents the relationship between water content and suction in the soil. The paper introduces six methods with their suitable application ranges. The volumetric pressure plate can measure the matric suction value of less than 1500kPa on wetting and drying SWCCs. The temple apparatus can measure matric suction range from 0 to 100kPa. Matric suction and total suction can be tested with filter paper. The dew-point potentiometer can be used to measure total suction, especially osmotic suction. The TDR probe is the same with matric suction less than 300kPa. The triaxial test system for GDS can be used to test SWCC. The test range lies on the air-entry value. It has a great significance for SWCC since it can be used in exact mathematic models to predict mechanics properties, coefficient of infiltration, shear strength and analysing stability of slope for unsaturated soil. It is very difficult to attain the curves accurately, which are affected by many additional factors . It is an alternative idea to predict SWCC with pore-size distribution and grain-size distribution.
- Unsaturated soil mechanics /
- Soil-water characteristic curve (SWCC) /
- Mathematic model

HTML全文

参考文献(1)

[1] 　Agus S S,Leong G E C,Rahardjo H R.Soil-water characteristiccurves of singapore residual soils
[J].Geotechnical and Geological Engineering,2001,(19):285～309.

[2] 　Fredlund D C,Rahardjo.陈仲颐,张在明,陈愈炯等译.非饱和土力学
[M].北京:中国建筑工业出版社,1997,92～95.Fredlund D C,Rahardjo.Chen Zhongyi,Zhang Zaim ing,Chen Yujiong,et a.l.Version.soil mechanics for unsaturated soils.Beijing:China A rchitecture&Building Press,1997,92～95.

[3] 　Leong E C,Tripathy S,Rahardjo H.Total suction measurement of unsaturated soils with a device using the chilled-m irror dew-point technique
[J].Geotechnique,2003,53(2):173～182.

[4] 　Cook David L,Fredlund Delwyn G.TDR matric suction measurements
[A].Proceedings of the second international conference on unsaturated soils
[C].China Beijing,1998,338～343.

[5] 　Fredlund D G,Xing A.Equations for the soil-water characteristic curve
[J].Can.Geotech.J.,1994,(31):521～532.

[6] 　Leong E C,Rahardjo H.Review of soil-water characteristic curve equations
[J].Journal of Geotechnical and Geoenvironmental Engineering,1997,123(12):1106～1117.

[7] 　徐永福,董平.非饱和土的水分特征曲线的分形模型
[J].岩土力学,2002,23(4):400～405.Xu Yongfu,Dong Ping.Fractal models for the soil water characteristics of unsaturated soils
[J].Rock and Soil Mechanics,2002,23(4):400～405.

[8] 　戚国庆,黄润秋.土水特征曲线的通用数学模型研究
[J].工程地质学报,2004,12(2):182～186.Q i Guoqing,Huang Ruiqiu.An universal mathematical model of soil-water characteristic curve
[J].Journal of Engineering Geology,2004,12,(2):182～186.

[9] 　詹良通,包承钢.土水特征曲线及其在非饱和土力学中的应用
[A].南水北调膨胀土渠坡稳定和滑动早期预报研究论文集
[C].武汉:长江科学院,1998,79～90.Zhan L ingtong,Bao Chengang.The app lication of soil-water characteristic curve in unsaturated soil mechanics
[A].Collection of research paper on stability of the trench slope and p rediction of the forepart slip-page in South-to-north water transfer
[C].W uhan:Yangtze R iver Scientific Research Institute,1998,79～90.

[10] 　李志清,胡瑞林,王立朝等.非饱和膨胀土SWCC研究
[J].岩土力学,2006,27(5):730～734.L i Zhiqing,Hu Ruilin,W ang L ichao,et a.l.Study on SWCC of unsaturated expansive soil
[J].Rock and SoilMechanics,2006,27(5):730～734.

[11] 　Fernando A M,Marinho.Nature of soil-water characteristic curve for p lastic soils
[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(5):654～658.

[12] 　Zhang L im in,Chen Qun.Predicting bimodal soil-water characteristic curves
[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(5):666～670.

[13] 　Fredlund M D,Fredlund D G,W ilson GW.Prediction of the soil-water characteristic curve from grain-size distribution and volume-mass p roperties
[A].3rd B razilian symposium on unsaturated soils
[C].B razil,1997,22～25.

[14] 　Gup ta S C,Larson W E.Estimating soil water retention charac2teristics from particle size distribution,organic matter percent,and bulk density
[J].W ater Resources Research,1979,15(6):1633～1635.

[15] 　Murray Fredlund D,W ard W ilson G,Delwyn Fredlund G.U seof the grain-size distributi-on for estimation of the soil-water characteristic curve
[J].Can.Geotech.J.,2002,(39):1103～1117.

[16] 　Van Genuchten M T.A closed-form equation for p redicting the hydraulic conductivity of unsaturated soils
[J].Soil Sc.iSoc.Am.J.,1980,(44):892～898.

[17] 　Sivakumar G L,Muthy D S N.Reliability anal-ysis of unsaturated soil slope
[J].Geotechnical and Geological Engineering,2005,(131):1423～1433.

[18] 　黄润秋,戚国庆.滑坡基质吸力观测研究
[J].岩土工程学报,2004,26(2):216～219.Huang Runqiu,Q i Guoqing.The field observation of suction in the land-slide
[J].Chinese Journal of Geotechnical Engineering,2004,26(2):216～219.

[19] 　吴礼舟,黄润秋,董秀军.非饱和土中的饱和度的求解方法
[J].工程地质学报,2006,14(6):788～791.W u L izhou,Huang Runqiu,Dong Xiujun.Methods for measuring degree of saturation in unsaturated soil.Jounal of Engineering Geolgoy,2006,14(6):788～791.

施引文献

资源附件(0)

访问统计