三种模型在浙江省土石坝填筑土土水特征曲线中适用性研究
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摘要
土石坝是由饱和与非饱和渗流区组成的统一体,渗流问题是影响土石坝运行安全的关键因素之一.土水特征曲线(SWCC)是非饱和渗流数值模拟的重要基础.浙江省土石坝众多,对其填筑土持水性研究具有重要意义.确定一个合适的模型来描述填筑土的SWCC是研究的基础.通过压力板仪,对3种浙江省土石坝典型填筑土进行持水试验,选取VG、FX和MX模型对试验数据进行拟合,并对拟合结果进行分析.结果表明,VG模型并不适用于土石坝填筑土,FX和MK模型均取得了较好的效果,FX模型在适用性和普遍性上更好.
Earth-rockfill dams are a unity of saturated and unsaturated seepage zones. Seepage is thus a key factor for the sound operation of earth-rockfill dams. Soil-water Characteristic Curve(SWCC)is an important basis to simulate unsaturated seepage zones. With a large number of earth-rockfill dams in Zhejiang Province,it is significant to study the water retention capability of the filling soil. Firstly,it is necessary to find a suitable model to describe the SWCC of the filling soil. In this paper,water retention tests were conducted via pressure plate instrument on three typical filling soils for earth-rockfill dams in Zhejiang. VG,FX and MX Models were adopted in fitting the experimental data. The analysis on fitting results suggest that the VG Model was not suitable for earth-rockfill dams,while the FX and MX Models achieved preferable effects,and FX Model excelled at applicability and universality.
Earth-rockfill dams are a unity of saturated and unsaturated seepage zones. Seepage is thus a key factor for the sound operation of earth-rockfill dams. Soil-water Characteristic Curve(SWCC)is an important basis to simulate unsaturated seepage zones. With a large number of earth-rockfill dams in Zhejiang Province,it is significant to study the water retention capability of the filling soil. Firstly,it is necessary to find a suitable model to describe the SWCC of the filling soil. In this paper,water retention tests were conducted via pressure plate instrument on three typical filling soils for earth-rockfill dams in Zhejiang. VG,FX and MX Models were adopted in fitting the experimental data. The analysis on fitting results suggest that the VG Model was not suitable for earth-rockfill dams,while the FX and MX Models achieved preferable effects,and FX Model excelled at applicability and universality.
引文
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[6] PACHEPSKY Y A,SHCHERBAKOV R A,KORSUNSKAYA L P.Scaling of soil water retention using a fractal model[J].Soil Science. 1995,159(2):99—104.
[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.2002,4(23):400—405.XU Y F,DONG P.Fractal models for the soil-water characteristics of unsaturated soils[J].Rock and Soil Mechanics,2002,4(23):400—405.(In Chinese)
[8] AUBERTIN M,MBONIMPA M,BUSSIERE B,et al.A model to predict the water retention curve from basic geotechnical Properties[J].Canadian Geotechnical Journal,2003,40(6):1104—1122.
[9]张雪东.土水特征曲线及其在非饱和土力学中应用的基本问题研究[D].北京:北京交通大学,2010.ZHANG X D.Reserch on the principle problem relating to soilwater characteristic curve and its application in unsaturayted soil mechanics[D].Beijing:Beijing Jiaotong University,2010.(In Chinese)
[10]杨文治,邵明安.黄土高原土壤水分研究[M].北京:科学出版社,2000.YANG W Z,SHAO M A.Soil hydro-physical properties of loess plateau[M].Beijing:Sciences Press,2000.(In Chinese)
[11]雷志栋.土壤水动力学[M].北京:清华大学出版社,1988.LEI Z D.Soil hydrodynamics[M].Beijing:Tsinghua University Press,1988.(In Chinese)
[12]福斯.H.D.土壤科学原理[M].北京:农业出版社,1984.FOS H D.Principles of soil science[M].Beijing:Agricultural Press,1984.(In Chinese)
[13]日本土壤物理性测定委员会,翁德衡.土壤物理性测定法[M].北京:科学出版社,1978.Japan Soil Physical Property Determination Committee, Wang de Heng. Soil physical property determination method[M].Beijing:Sciences Press,1978.(In Chinese)
[14]陈仲颐.非饱和土土力学[M].北京:中国建筑工业出版社,1997.CHEN Z Y.Soil mechanics for unsaturated soil[M].Beijing:China Architecture&Building Press,1997.(In Chinese)