接触面滑坡滑带土吸力的滤纸法测试
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摘要
吸力是控制非饱和土状态的一个决定性因素,滤纸法就是一种间接测量吸力的方法,具有成本低、测量范围大、测量精度高等优点。滤纸法测试土样取自甘肃省天水市一黄土–泥岩接触面滑坡的滑带土,该土样的强度对含水率变化非常敏感,因此对该滑带土的非饱和特性的研究至关重要。试验中首先测定了该滤纸干湿两种状态下的平衡时间,然后对试样分别采用干湿两种状态下的双圈牌203和WhatmanNo.42型滤纸进行了对比试验,运用接触式和非接触式方法分别测定试样的基质吸力和全吸力。通过分析对比低吸力段滤纸含水率,确定了滤纸法测试该类土的下限吸力值。采用Oringin软件对试样全阶段基质吸力曲线拟合,确定了相应的拟合参数和合适的拟合方程。为进一步研究和治理该滑坡提供了参考价值。
Suction is a decisive factor to control the state of unsaturated soils. The filter paper method is an indirect method for measuring suction, which has the advantages of low cost, large measuring range and high precision. The soil samples are collected from a loess-mudstone landslide in Tianshui, Gansu Province. The strength of soil samples is very sensitive to change of soil water content, so the study on the properties of unsaturated soils of the sliding soil is essential. The equilibrium time of the filter paper is measured under wet and dry conditions. Then, the samples are tested by double-circle 203 and Whatman No. 42 filter papers under dry and wet conditions. The contact and Non-contact methods are used to measure the matrix suction and total suction respectively. The lower suction value of this kind of soil is determined by analyzing and comparing the moisture content of filter papers in low suction section. The Oringin software is used to fit the matrix suction curve of the samples, and the corresponding fitting parameters and equation are determined so as to provide a reference for further study and treatment of the landslide.
Suction is a decisive factor to control the state of unsaturated soils. The filter paper method is an indirect method for measuring suction, which has the advantages of low cost, large measuring range and high precision. The soil samples are collected from a loess-mudstone landslide in Tianshui, Gansu Province. The strength of soil samples is very sensitive to change of soil water content, so the study on the properties of unsaturated soils of the sliding soil is essential. The equilibrium time of the filter paper is measured under wet and dry conditions. Then, the samples are tested by double-circle 203 and Whatman No. 42 filter papers under dry and wet conditions. The contact and Non-contact methods are used to measure the matrix suction and total suction respectively. The lower suction value of this kind of soil is determined by analyzing and comparing the moisture content of filter papers in low suction section. The Oringin software is used to fit the matrix suction curve of the samples, and the corresponding fitting parameters and equation are determined so as to provide a reference for further study and treatment of the landslide.
引文
[1]FREDLUND D G,RAHARDJO H.Soil mechanics for unsaturated soils[M].Wiley,1993.
[2]HOUSTON S L,HOUSTON W N,WAGNER A M.Laboratory filter paper suction measurements[J].Geotechnical Testing Journal,1994,17(2):185-194.
[3]GARDNER R,GARDNER R.A method of measuring the capillary tension of soil moisture over a wide moisture range[J].Soil Science,1937,43(4):277-284.
[4]白福青,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 Fu-qing,LIU Si-hong,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))
[5]蒋刚,王钊,邱金营.国产滤纸吸力-含水率关系率定曲线的研究[J].岩土力学,2000,21(1):72-75.(JIANGGang,WANG Zhao,QIU Jin-ying.Suction calibration curveof homemade filter paper[J].Rock and Soil Mechanics,2000,21(1):72-75.(in Chinese))
[6]唐栋,李典庆,金浩飞,等.国产“双圈”牌滤纸吸力率定曲线研究[J].武汉大学学报(工学版),2016,49(1):1-8.(TANG Dong,Li Dian-qing,KIM Ho-bi,et al.Research on calibration curves of home-made“Double Circle”filter papers[J].Engineering Journal of Wuhan University,2016,49(1):1-8.(in Chinese))
[7]刘小丽,邓建辉,李广涛.滑带土强度特性研究现状[J].岩土力学,2004,25(11):1849-1854.(LIU Xiao-li,DENGJian-hui,LI Guang-tao.Shear strength properties of slip soils oflandslides:an overview[J].Rock and Soil Mechanics,2004,25(11):1849-1854.(in Chinese))
[8]王君鹭,唐辉明,倪卫达.黄土坡滑坡滑带土非饱和力学特性试验研究[J].工程地质学报,2015,23(2):211-218.(WANG Jun-lu,TANG Hui-ming,NI Wei-da.Unsaturated mechanical property test of sliding-zone soil of Huangtupo landslide[J].Journal of Engineering Geology,2015,23(2):211-218.(in Chinese))
[9]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.(LI Zhi-qing,HU Rui-lin,WANG Li-chao.Study on SWCC of unsaturatedexpansive soil[J].Rock and Soil Mechanics,2006,27(5):730-734.(in Chinese))
[10]XU Y,SUN D.Determination of expansive soil strength using a fractal model[J].Fractals,2001,9(1):51-60.
[11]BOHN Hinrich.The thermodynamics of soil solutions[J].Eos Transactions American Geophysical Union,1981,63(24):538-538.
[12]刘伟.黄土-泥岩接触面滑坡滑带土变形特征研究[D].兰州:兰州大学,2016.(LUI Wei.Study on deformation characteristics of slip surface of loess-mudstone interface landslide[D].Lanzhou:Lanzhou University,2016.(in Chinese))
[13]ASTM Standard D5298-10.Standard test method for the measurement of soil potential(suction)using filter paper[S].2010.
[14]MARINHO F A M,OLIVEIRA O M.The filter paper method revisited[J].Geotechnical Testing Journal,2006,29(3):250-258.
[15]AL-KHAFAF S,HANKS R J.Evaluation of the filter paper method for estimating soil water potential[J].Soil Science,1974,117(4):194-199.
[16]SUITS L D,SHEAHAN T C,LEONG E C.Factors affecting the filter paper method for total and matric suction measurements[J].Geotechnical Testing Journal,2002,25(3):322-333.
[17]VAN Genuchten M T.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44(5):892-898.
[18]FREDLUND D G,XING A.Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.
[2]HOUSTON S L,HOUSTON W N,WAGNER A M.Laboratory filter paper suction measurements[J].Geotechnical Testing Journal,1994,17(2):185-194.
[3]GARDNER R,GARDNER R.A method of measuring the capillary tension of soil moisture over a wide moisture range[J].Soil Science,1937,43(4):277-284.
[4]白福青,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 Fu-qing,LIU Si-hong,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))
[5]蒋刚,王钊,邱金营.国产滤纸吸力-含水率关系率定曲线的研究[J].岩土力学,2000,21(1):72-75.(JIANGGang,WANG Zhao,QIU Jin-ying.Suction calibration curveof homemade filter paper[J].Rock and Soil Mechanics,2000,21(1):72-75.(in Chinese))
[6]唐栋,李典庆,金浩飞,等.国产“双圈”牌滤纸吸力率定曲线研究[J].武汉大学学报(工学版),2016,49(1):1-8.(TANG Dong,Li Dian-qing,KIM Ho-bi,et al.Research on calibration curves of home-made“Double Circle”filter papers[J].Engineering Journal of Wuhan University,2016,49(1):1-8.(in Chinese))
[7]刘小丽,邓建辉,李广涛.滑带土强度特性研究现状[J].岩土力学,2004,25(11):1849-1854.(LIU Xiao-li,DENGJian-hui,LI Guang-tao.Shear strength properties of slip soils oflandslides:an overview[J].Rock and Soil Mechanics,2004,25(11):1849-1854.(in Chinese))
[8]王君鹭,唐辉明,倪卫达.黄土坡滑坡滑带土非饱和力学特性试验研究[J].工程地质学报,2015,23(2):211-218.(WANG Jun-lu,TANG Hui-ming,NI Wei-da.Unsaturated mechanical property test of sliding-zone soil of Huangtupo landslide[J].Journal of Engineering Geology,2015,23(2):211-218.(in Chinese))
[9]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.(LI Zhi-qing,HU Rui-lin,WANG Li-chao.Study on SWCC of unsaturatedexpansive soil[J].Rock and Soil Mechanics,2006,27(5):730-734.(in Chinese))
[10]XU Y,SUN D.Determination of expansive soil strength using a fractal model[J].Fractals,2001,9(1):51-60.
[11]BOHN Hinrich.The thermodynamics of soil solutions[J].Eos Transactions American Geophysical Union,1981,63(24):538-538.
[12]刘伟.黄土-泥岩接触面滑坡滑带土变形特征研究[D].兰州:兰州大学,2016.(LUI Wei.Study on deformation characteristics of slip surface of loess-mudstone interface landslide[D].Lanzhou:Lanzhou University,2016.(in Chinese))
[13]ASTM Standard D5298-10.Standard test method for the measurement of soil potential(suction)using filter paper[S].2010.
[14]MARINHO F A M,OLIVEIRA O M.The filter paper method revisited[J].Geotechnical Testing Journal,2006,29(3):250-258.
[15]AL-KHAFAF S,HANKS R J.Evaluation of the filter paper method for estimating soil water potential[J].Soil Science,1974,117(4):194-199.
[16]SUITS L D,SHEAHAN T C,LEONG E C.Factors affecting the filter paper method for total and matric suction measurements[J].Geotechnical Testing Journal,2002,25(3):322-333.
[17]VAN Genuchten M T.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44(5):892-898.
[18]FREDLUND D G,XING A.Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.