黄泛区非饱和砂质粉土的土-水特征曲线试验研究
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摘要
为了确定黄泛区非饱和砂质粉土的土-水特征曲线,以开封市朗润园小区的地下土为试验对象,通过滤纸法对其进行了室内试验研究,并利用Van Genuchten模型对试验测定出的土-水特征曲线进行了拟合。研究结果表明:非饱和砂质粉土的进气值约为9.5kPa,残余饱和度对应的吸力值约为73.5kPa,非饱和土的减饱和过程具有明显的阶段特征。根据拟合出的含水率和吸力之间的函数关系,可以预测黄泛区非饱和砂质粉土的土-水特征曲线。
In order to determine the soil-water characteristic curve characteristic of unsaturated sandy silt soil in the Yellow River flood area, the filter paper method was used to carry out laboratory experiments, and the underground soil of Kaifeng City Langrun Park areas is taken as the experimental object to determine soil-water characteristic curve of unsaturated sandy silt in the Yellow River flood area. Then the soil water characteristic curve measured by the test was fitted by using the Van Genuchten model. The results show that the inlet value of unsaturated sandy silt is about 9.5 kPa, the suction value of the residual saturation is about 73.5 kPa, and the decreasing saturation process of unsaturated soil has obvious phase characteristics. In addition, according to the function relation between the water content and the suction, the soil water characteristic curve of the unsaturated sandy silty soil in the Yellow River flood area can be predicted.
In order to determine the soil-water characteristic curve characteristic of unsaturated sandy silt soil in the Yellow River flood area, the filter paper method was used to carry out laboratory experiments, and the underground soil of Kaifeng City Langrun Park areas is taken as the experimental object to determine soil-water characteristic curve of unsaturated sandy silt in the Yellow River flood area. Then the soil water characteristic curve measured by the test was fitted by using the Van Genuchten model. The results show that the inlet value of unsaturated sandy silt is about 9.5 kPa, the suction value of the residual saturation is about 73.5 kPa, and the decreasing saturation process of unsaturated soil has obvious phase characteristics. In addition, according to the function relation between the water content and the suction, the soil water characteristic curve of the unsaturated sandy silty soil in the Yellow River flood area can be predicted.
引文
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[21]包承纲.非饱和土的性状及膨胀土边坡稳定问题[J].岩土工程学报,2004,26(1):1-15.(BAO Chenggang.Behavior of unsaturated soil and stability of expansive soil slope[J].Chinese journal of geotechnical engineering,2004,26(1):1-15(in Chinese)).
[22]XIE Dingyi,XU Miao,LIU Fengyin.Affection of stress condition to the suction characteristics of unsaturated loess soil[C]//Proceedings of the Second International Conference on Unsaturated Soil.Beijing:[s.n.],1998:179-185.
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[24]GENUCHTEN M T V.A closed form equation for predicting the hydraulic conductivity of unsaturated soils[J].America journal of soil science society,1980,44(44):892-898.
[25]张涛,乐金朝,张俊然.压实度和干湿循环对豫东粉土土-水特征曲线的影响[J].郑州大学学报(工学版),2016,37(6):53-57.(ZHANG Tao,YUE Jinchao,ZHANG Junran.Influence of compaction degree and drying-wetting cycle on the soil-water characteristic curve of Yudong silt[J].Journal of Zhengzhou university(engineering science),2016,37(6):53-57(in Chinese)).
[2]白福清,刘斯宏,袁骄.滤纸法测定南阳中膨胀土土水特征曲线试验研究[J].岩土工程学报,2011,33(6):928-933.(BAI Fuqing,LIU Sihong,YUAN Jiao.Measurement of SWCC of Nanyang expansive soil using the filter paper method[J].Chinese journal of geotechnical engineering,2011,33(6):928-933(in Chinese)).
[3]叶为民,白云,金麒,等.上海软土土水特征的室内试验研究[J].岩土工程学报,2006,28(2):260-263.(YE Weimin,BAI Yun,JINQi,et al.Lab experimental study on soil-water characteristics of Shanghai soft clay[J].Chinese journal of geotechnical engineering,2006,28(2):260-263(in Chinese)).
[4]刘小文,常立君,胡小荣.非饱和红土基质吸力与含水率及密度关系试验研究[J].岩土力学,2009,30(11):3302-3306.(LIUXiaowen,CHANG Lijun,HU Xiaorong.Experimental research of matric suction with water content and dry density of unsaturated laterite[J].Rock and soil mechanics,2009,30(11):3302-3306(in Chinese)).
[5]李龙起,罗书学,姜红,等.非饱和红黏土土水特性及强度特征研究[J].西南交通大学学报,2014,49(3):393-398,431.(LI Longqi,LUO Shuxue,JIANG Hong,et al.Soil-water and shear strength characteristics of unsaturated red clay[J].Journal of southwest Jiaotong university,2014,49(3):393-398,431(in Chinese)).
[6]ZHOU Jian,YU Jianlin.Influences affecting the soil-water characteristic curve[J].Journal of Zhejiang university science A(applied physics&engineering),2005,6(8):797-804.
[7]徐全,谭晓慧,辛志宇,等.土水特征曲线的概率分析[J].水文地质工程,2015,42(3):79-85.(XU Quan,TAN Xiaohui,XIN Zhiyu,et al.Probabilistic analysis of the soil-water characteristic curve[J].Hydrogeology&engineering geology,2015,42(3):79-85(in Chinese)).
[8]张卫华,赵成刚,傅芳,等.基于相变状态的非饱和砂土边界面本构模型[J].应用力学学报,2015,32(5):724-730.(ZHANGWeihua,ZHAO Chenggang,FU Fang,et al.The bounding-surface constitutive model for unsaturated sands based on the phase transformation state[J].Chinese journal of applied mechanics,2015,32(5):724-730(in Chinese)).
[9]DOLINAR B.Prediction of the soil-water characteristic curve based on the specific surface area of fine-grained soils[J].Bulletin of engineering geology&the environment,2015,74(3):697-703.
[10]中华人民共和国交通运输部.港口工程地基规范:JTS147-1-2010[S].北京:人民交通出版社,2010.(Ministry of Transport of the People's Republic of China.Specification for foundations of port engineering:JTS 147-1-2010[S].Beijing:China Communications Press,2010(in Chinese)).
[11]汪东林,栾茂田,杨庆.重塑非饱和黏土的土-水特征曲线及其影响因素研究[J].岩土力学,2009,30(3):751-756.(WANG Donglin,LUAN Maotian,YANG Qing.Experimental study of soil-water characteristic curve of remolded unsaturated clay[J].Rock and soil mechanics,2009,30(3):751-756(in Chinese)).
[12]李顺群,贾红晶,王杏杏.轴平移技术在基质吸力测控中的局限性和误差分析[J].岩土力学,2016,37(11):3089-3095.(LI Shunqun,JIA Hongjing,WANG Xingxing.Limitation and error analysis of axis translation technique for measuring and controlling matric suction[J].Rock and soil mechanics,2016,37(11):3089-3095(in Chinese)).
[13]HOUSTON S L,HOUSTON W N,WAGNER A.Laboratory filter paper suction measurements[J].Geotechnical testing journal,1994,17(2):185-194.
[14]SUITS L D,SHEAHAN T C,LEONG E C,et al.Factors affecting the filter paper method for total and matric suction measurements[J].Geotechnical testing journal,2002,25(3):1-12.
[15]GARDNER W R.Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table[J].Soil science,1958,85(4):228-232.
[16]BROOKS R H.Hydraulic properties of porous medium[J].Hydrology paper,1964,3(1):352-366.
[17]WILLIAMS P J.The surface of the earth,an introduction to geotechnical science[M].London:Longman Inc.,1982.
[18]ASSOULINE S,TESSIER D,BRUAND A.A conceptual model of the soil water retention curve[J].Water resources research,1998,34(2):223-231.
[19]FENG M,FREDLUND D G.Hysteretic influence associated with thermal conductivity sensor measurements[C]//Proceedings from Theory to the Practice of Unsaturated Soil Mechanics in Association with the 52nd Canadian Geotechnical Conference and the Unsaturated Soil Group.Regina,Sask:[s.n.],1999.
[20]陈正汉.非饱和土固结的混合物理论[D].西安:陕西机械学院,1991.(CHEN Zhenghan.Theory of consolidation of unsaturated soil mixtures[D].Xi’an:Shanxi Mechanical Institute,1991(in Chinese)).
[21]包承纲.非饱和土的性状及膨胀土边坡稳定问题[J].岩土工程学报,2004,26(1):1-15.(BAO Chenggang.Behavior of unsaturated soil and stability of expansive soil slope[J].Chinese journal of geotechnical engineering,2004,26(1):1-15(in Chinese)).
[22]XIE Dingyi,XU Miao,LIU Fengyin.Affection of stress condition to the suction characteristics of unsaturated loess soil[C]//Proceedings of the Second International Conference on Unsaturated Soil.Beijing:[s.n.],1998:179-185.
[23]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(in Chinese)).
[24]GENUCHTEN M T V.A closed form equation for predicting the hydraulic conductivity of unsaturated soils[J].America journal of soil science society,1980,44(44):892-898.
[25]张涛,乐金朝,张俊然.压实度和干湿循环对豫东粉土土-水特征曲线的影响[J].郑州大学学报(工学版),2016,37(6):53-57.(ZHANG Tao,YUE Jinchao,ZHANG Junran.Influence of compaction degree and drying-wetting cycle on the soil-water characteristic curve of Yudong silt[J].Journal of Zhengzhou university(engineering science),2016,37(6):53-57(in Chinese)).