合肥新桥国际机场原状非饱和膨胀土的土水特性研究

汪明武; 杨江峰; 李健; 秦帅

doi:10.13204/j.gyjz201212010

合肥新桥国际机场原状非饱和膨胀土的土水特性研究

doi: 10.13204/j.gyjz201212010

1.
合肥工业大学土木与水利工程学院,合肥 230009

基金项目:

国家自然科学基金项目(41172274)

详细信息

作者简介:
汪明武，男，1972 年出生，博士，教授，博士生导师。E-mail:geotechnics@foxmail.com

计量
- 文章访问数: 192
- HTML全文浏览量: 2
- PDF下载量: 152
- 被引次数: 0
出版历程
- 收稿日期: 2012-05-05
- 刊出日期: 2012-12-20

SOIL-WATER CHARACTERISTICS OF UNDISTURBED AND UNSATURATED EXPANSIVE CLAYS IN THE XINQIAO INTERNATIONAL AIRPORT AREA OF HEFEI

1.
School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China

摘要

摘要: 土水特性影响并控制着非饱和膨胀土的工程特性。基于扫描电子显微镜试验和GDS非饱和应力路径系统试验,对合肥新桥机场场地原状非饱和膨胀土在失水和吸水过程中土水特征曲线进行研究,并数值反演相应的土水特征曲线、相对渗透系数和土水扩散系数,研究得出工程区域原状膨胀土微结构易于形成微裂隙,吸湿土水特征曲线较失水过程的土水特征曲线存在明显的滞后性。数值分析结果表明,Fredlund模型与实测结果吻合较好,研究结果为新桥机场膨胀土地基处理方案的制定提供了一定依据。
- 非饱和土 /
- 膨胀土 /
- 土水特征曲线 /
- 相对渗透系数
Abstract: Soil-water characteristics play roles in engineering behaviors of undisturbed and unsaturated expansive clays.Based on SEM and other experiments,microstructures and shrinkage-swelling properties were discussed for the unsaturated expansive clays in the area of Xinqiao International Airport in Hefei.Moreover,soil-water characteristic curves(SWCCs) during drying and wetting process were measured by means of GDS triaxial stress path system,and numerical simulations and comparisons were conducted for the corresponding SWCC,relative hydraulic conductivity and soil-water diffusivity.The results showed that the measured SWCCs during wetting process behaved hysteresis with reference to that during drying process.The simulation SWCC using Fredlund model was in good agreement with the measured curve.These results provided a certain basis for making a rational foundation treatment plan for the Xinqiao International Airport founded on expansive clays.
- unsaturated soil /
- expansive clay /
- soil-water characteristic curve /
- relative hydraulic conductivity

HTML全文

参考文献(14)

[2] Wang M,Chen G.A Novel Coupling Model for Risk Analysis ofSwell and Shrinkage of Expansive Soils[J].Computers and Mathematics with Applications,2011,62(7):2854-2861.

Du Yanjun,Li Shenglin,Hayashi Shigenori.Swelling-ShrinkageProperties and Soil Improvement of Compacted Expansive Soil,Ning-Liang Highway[J].Engineering Geology,1999,53(3/4):351-358.

[3] Van Genuchten M T.A Close-From Equation for Predicting theHydraulic Conductivity of Unsaturated Soils[J].Soil ScienceSociety of America Journal,1980,44(5):892-898.

[4] Fredlund D G,Xing A.Equations for the Soil-WaterCharacteristic Curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.

[5] Ng C W W,Zhan L T,Cui Y J.A New Simple System forMeasuring Volume Changes in Unsaturated Soils[J].Canadian Geotechnical Journal,2002,39(3):757764.

[6] Wheeler S J,Sharma R S,Buisson M S R.Coupling of HydraulicHysteresis and Stress-Strain Behaviour in Unsaturated Soils[J].Geotechnique,2003,53(1):43-54.

[7] 陈正汉,孙树国,方祥位,等.非饱和土与特殊土测试技术新进展[J].岩土工程学报,2006,28(2):147-169.

[8] 包承纲,詹良通.非饱和土性状及其与工程问题的联系[J].岩土工程学报,2006,28(2):129-136.

[9] 缪林昌,刘松玉.南阳膨胀土的水分特征和强度特性研究[J].水利学报,2002(7):87-92.

[10] 龚壁卫,吴宏伟,王斌.应力状态对膨胀土SWCC的影响研究[J].岩土力学,2004,5(12):1915-1918.

[11] 孔令伟,郭爱国,赵颖文,等.荆门膨胀土的水稳定性及其力学效应[J].岩土工程学报,2004,26(6):727-732.

[12] 叶为民,钱丽鑫,白云,等.由土-水特征曲线预测上海非饱和软土渗透系数[J].岩土工程学报,2005,27(11):1262-1 265.

[13] 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.

[14] Wang Mingwu,Ge Kang,Zhu Darong.Experimental Study ofEngineering Behaviors on Improved Expansive Soils in the XinqiaoAirport Runway of Hefei[J].Advanced Materials Research,2011,261/263:1329-1335.

施引文献

资源附件(0)

访问统计