土壤膨胀性对土壤饱和水分运动参数的影响
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摘要
膨胀性土壤吸水后易膨胀变形,从而影响到土壤水分的运动参数。为了研究土壤膨胀性对土壤饱和水分运动参数的影响,采用室内土柱试验装置分析了不同土壤厚度(2,4,6,8,10,15,20,25,30,35,40,45,50,55cm)对3种土壤(沙土、黄绵土、娄土)土壤容重、土壤饱和含水量、土壤饱和导水系数的影响,并分别用幂函数、指数函数和对数函数进行了拟合分析。结果表明:①土壤饱和膨胀率、饱和比容积、饱和含水量和饱和导水系数均随土壤厚度增加而减小。②通过3种函数拟合效果对比发现,幂函数具有最佳拟合效果。
The expansive soil will greatly affect the movement parameters of soil moisture after absorbing water. In order to study the influence of soil swelling on soil saturated water movement parameters,indoor soil column test was conducted to analyze the influence of different soil thicknesses (2,4,6,8,10,15,20,25,30,35,40,45,50,55 cm) on soil bulk density,saturated soil water content,and saturated soil hydraulic conductivity in the terms of three types of soils (sandy soil,loess soil,and bauxite soil) and fitting analysis was performed using power,exponential,and logarithmic functions respectively. The results showed that: ① Soil saturated expansion rate,saturated specific volume,saturated moisture content and saturated hydraulic conductivity all decreased with increasing soil thickness. ② Through the comparison of the three function fitting effects,the power function had the best fitting effect.
The expansive soil will greatly affect the movement parameters of soil moisture after absorbing water. In order to study the influence of soil swelling on soil saturated water movement parameters,indoor soil column test was conducted to analyze the influence of different soil thicknesses (2,4,6,8,10,15,20,25,30,35,40,45,50,55 cm) on soil bulk density,saturated soil water content,and saturated soil hydraulic conductivity in the terms of three types of soils (sandy soil,loess soil,and bauxite soil) and fitting analysis was performed using power,exponential,and logarithmic functions respectively. The results showed that: ① Soil saturated expansion rate,saturated specific volume,saturated moisture content and saturated hydraulic conductivity all decreased with increasing soil thickness. ② Through the comparison of the three function fitting effects,the power function had the best fitting effect.
引文
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[2]黄斌,程展林,徐晗.膨胀土膨胀模型及边坡工程应用研究[J].岩土力学,2014,35(12):3550-3555.
[3]黄传琴.干湿交替过程中土壤胀缩特征的试验研究[D].杨凌:西北农林科技大学,2015.
[4]甘永德,刘欢,贾仰文,等.膨胀性土壤饱和水分运动参数计算模型[J].工程科学与技术,2018,50(2):77-83.
[5]甘永德,贾仰文,刘欢,等.膨胀性土壤降雨入渗产流模型[J].水利学报,2017,48(10):1220-1228,1239.
[6]杨运来.黄土湿陷机理的研究[J].中国科学(B辑),1988(7):756-766.
[7]谢婉丽,王延寿,马忠豪,等.黄土湿陷机理研究现状及发展趋势[J].现代地质,2015,29(2):397-407.
[8]丁振洲,李利晟,郑颖人.膨胀土增湿变形规律及计算公式[J].工程勘察,2006(7):13-16.
[9]龙安宝.浅论膨胀土在胀缩变形过程中的应力应变状态[J].四川建筑科学研究,2003,29(4):49-52.
[10]霍云鹏.黑龙江省几种主要土壤膨胀性的研究[J].土壤通报,1965(1):41-44.
[11]Davidson S E,Pay J B.Factors influencing swelling and shrinkage in soils[J].Soil Sci.Soc Am,1956,(20):320-324.
[12]郑柏杨.适合湿陷性黄土的入渗模型及入渗参数的变化情况研究[D].郑州:华北水利水电大学,2017.
[13]王益,王益权等.黄土地区影响土壤膨胀因素的研究[J].干旱地区农业研究,2005,23(5):93-97.
[14]陈祯,崔远来,刘方平.不同灌溉施肥模式下土壤湿胀干缩特征曲线及其滞后效应[J].农业工程学报,2013,29(11):78-84.
[15]黄传琴,邵明安.干湿交替过程中土壤胀缩特征的实验研究[J].土壤通报,2008,39(6):1243-1247.
[16]Mc Garry D,Malafant K W J.The analysis of volume change in unconfined units of soil[J].Soil science society of America Journal,1987,51(2):290-297.
[17]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社有限公司,1994.
[18]Lambe T W,Whitman R V.Soil Mechanics,SI version[M].New Jersey Soil mechanics,SI version,1979.