伊犁黄土总吸力和基质吸力土水特征曲线拟合模型
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摘要
新疆伊犁黄土具有湿陷性强烈、易溶盐含量高的特点,描述其非饱和土应力状态中的吸力参量时,须同时考虑总吸力和基质吸力两个参量。为此,通过滤纸法开展了不同含盐量下伊犁黄土的土水特征曲线试验,测量了不同含盐下伊犁黄土的总吸力与基质吸力,计算了不同含盐量下土样中溶液浓度,分析了含盐量对湿陷的影响,基于Gardner模型,提出了可以考虑易溶盐含量影响的伊犁黄土总吸力和基质吸力土水特征曲线的拟合模型。研究结果表明:含盐量对新疆伊犁黄土的基质吸力有一定影响,对总吸力与渗透吸力影响较大;土样溶液浓度随着含盐量的增大而增大,总吸力与溶液浓度之间呈线性关系;随着土样内易溶盐含量的增加,土样湿陷系数明显增大;提出的土水特征曲线模型可以考虑易溶盐含量的影响,可以统一描述伊犁黄土总吸力和基质吸力随含水率、易溶盐含量变化的规律。
The Yili loess of Xinjiang is characterized by strong collapsibility and high soluble salt content. For describing the suction parameters in the stress state of the unsaturated soils, both the total and matrix suctions should be taken into account. Therefore, the soil-water characteristic curve(SWCC) tests on Yili loess with different salt contents are carried out by using the filter paper method. The total and matric suctions of Yili loess with different salt contents are measured. The solution concentrations of samples with different salt contents are calculated. Additionally, the effects of salt content on the collapsibility are analyzed. Based on the Gardner model, fitting models for SWCC of total and matrix suctions for Yili loess which can consider the influences of soluble salt content are proposed. The test results show that the salt content has a certain influence on the matrix suction of Yili loess of Xinjiang, and it has a great effect on the total and osmotic suction. The solution concentration in the soil samples increases with the increase of the salt content, and there is a linear relationship between the total suction and the concentration. With the increase of soluble salt content, the collapsibility of soil samples increases obviously. The proposed SWCC models can consider the influences of soluble salt content, and they can describe the variation of the total suction and matrix suctions for Yili loess with water content and soluble salt content.
The Yili loess of Xinjiang is characterized by strong collapsibility and high soluble salt content. For describing the suction parameters in the stress state of the unsaturated soils, both the total and matrix suctions should be taken into account. Therefore, the soil-water characteristic curve(SWCC) tests on Yili loess with different salt contents are carried out by using the filter paper method. The total and matric suctions of Yili loess with different salt contents are measured. The solution concentrations of samples with different salt contents are calculated. Additionally, the effects of salt content on the collapsibility are analyzed. Based on the Gardner model, fitting models for SWCC of total and matrix suctions for Yili loess which can consider the influences of soluble salt content are proposed. The test results show that the salt content has a certain influence on the matrix suction of Yili loess of Xinjiang, and it has a great effect on the total and osmotic suction. The solution concentration in the soil samples increases with the increase of the salt content, and there is a linear relationship between the total suction and the concentration. With the increase of soluble salt content, the collapsibility of soil samples increases obviously. The proposed SWCC models can consider the influences of soluble salt content, and they can describe the variation of the total suction and matrix suctions for Yili loess with water content and soluble salt content.
引文
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[19]刘祖典.黄土力学与工程[M].西安:陕西科学技术出版社,1997.(LIU Zu-dian.Mechanics and engineering of loess[M].Xi'an:Shaanxi Science and Technology Press,1997.(in Chinese))
[20]汪海涛,司富安,段世委,等.湿陷性黄土地区渠道工程地质勘察体会[J].资源环境与工程,2014,28(4):501-505.(WANG Hai-tao,SI Fu-an,DUAN Shi-wei,et al.Experience on engineering geological survey of channel constructionin collapsible loess area[J].Resources Environment&Engineering,2014,28(4):501-505.(in Chinese))
[21]高凌霞.黄土湿陷性的微结构效应及其评价方法研究[D].大连:大连理工大学,2011.(GAO Ling-xia.Study on microstructural effects on collapsibility of loess and its evaluation methods[D].Dalian:Dalian University of Technology,2011.(in Chinese))
[2]LU N,LIKOS W J.非饱和土力学[M].北京:高等教育出版社,2012.(LU N,LIKOS W J.Unsaturated soil mechanics[M].Beijing:Higher Education Press,2012.(in Chinese))
[3]BULUT R,LEONG E C.Indirect measurement of suction[J].Geotechnical&Geological Engineering,2008,26(6):633-644.
[4]FREDLUND D G,RAHARDJO H.Soil mechanics for unsaturated soils[M].New York:Wiley Inter,1993.
[5]张爱军,邢义川,胡新丽,等.伊犁黄土强烈自重湿陷性的影响因素分析[J].岩土工程学报,2016,38(增刊2):117-122.(ZHANG Ai-jun,XING Yi-chuan,HU Xin-li,et al.Influence factors of strong self-weight collapsibility of Ili loess[J].Chinese Journal of Geotechnical Engineering,2016,38(S2):117-122.(in Chinese))
[6]FATTAH M Y,YAHYA A Y,AL-HADIDI M T,et al.Effect of salt content on total and matric suction of unsaturated soils[J].European Journal of Scientific Research,2013(9):228-245.
[7]王利莉,党进谦,杨晓松.盐渍土土水特征曲线的研究[J].工程勘察,2009,37(2):19-23.(WANG Li-li,DANGJin-qian,YANG Xiao-song.The research of soil-water characteristic curves of saline soil[J].Geotechnical Investigation&Surveying,2009,37(2):19-23.(in Chinese))
[8]于沉香,张虎元,王志硕,等.盐渍土土水特征曲线测试及预测[J].水文地质工程地质,2013,40(2):113-118.(YUChen-xiang,ZHANG Hu-yuan,WANG Zhi-shuo,et al.Test and prediction of SWCC of saline soil[J].Hydrogeology&Engineering Geology,2013,40(2):113-118.(in Chinese))
[9]谷琪,王家鼎,仝云莉,等.滤纸法测非饱和黄土土水特征曲线试验及拟合研究[J].土壤通报,2016,47(3):588-593.(GU Qi,WANG Jia-ding,TONG Yun-li,et al.Soil-water characteristic curve test and simulation of unsaturated loess based on filter paper method[J].Chinese Journal of Soil Science,2016,47(3):588-593.(in Chinese))
[10]MU?OZ-CASTELBLANCO J A,PEREIRA J M,DELAGEP,et al.The water retention properties of a natural unsaturated loess from northern France[J].Géotechnique,2012,62(2):95-106.
[11]D 5298-10:Standard test method forthe measurement of soil potential(suction)using filter paper[S].2010.
[12]LEONG E C,HE L,RAHARDJO H.Factors affecting the filter paper method for total and matric suction measurements[J].Geotechnical Testing Journal,2002,25(3):1-12.
[13]铁道部第一勘测设计院.盐渍土地区铁路工程[M].北京:中国铁道出版社,1988.(Ministry of Railways First Survey and Design Institute.Saline soil area railway engineering[M].Beijing:China Railway Publishing House,1988.(in Chinese))
[14]孟庆珍,胡鼎文,程泉寿,等.无机化学[M].北京:北京师范大学出版社,1988.(MENG Qing-zhen,HU Ding-wen,CHENG Quan,et al.Inorganic chemistry[M].Beijing:Beijing Normal University Press,1988.(in Chinese))
[15]印永嘉.大学化学手册[M].山东:山东科学技术出版社,1985.(YIN Yong-jia.University chemistry handbook[M].Shandong:Shandong Science and Technology Press,1985.(in Chinese))
[16]谢定义.非饱和土土力学[M].北京:高等教育出版社,2015.(XIE Ding-yi.Soil mechanics for unsaturated soils[M].Beijing:Higher Education Press,2015.(in Chinese))
[17]DUDLEY J H.Review of collapsing soils[J].Journal of Soil Mechanics&Foundations Div,1970,97(3):925-947.
[18]张婉,张爱军,陈佳玫,等.含水率和密度对伊犁黄土湿陷系数的影响[J].西北农林科技大学学报(自然科学版),2017,45(5):211-220.(ZHANG Wan,ZHANG Ai-jun,CHEN Jia-mei,et al.Effect of moisture content and density on collapsibility coefficient of ili loess[J].Journal of Northwest A&F University(Nature Science Edit.),2017,45(5):211-220.(in Chinese))
[19]刘祖典.黄土力学与工程[M].西安:陕西科学技术出版社,1997.(LIU Zu-dian.Mechanics and engineering of loess[M].Xi'an:Shaanxi Science and Technology Press,1997.(in Chinese))
[20]汪海涛,司富安,段世委,等.湿陷性黄土地区渠道工程地质勘察体会[J].资源环境与工程,2014,28(4):501-505.(WANG Hai-tao,SI Fu-an,DUAN Shi-wei,et al.Experience on engineering geological survey of channel constructionin collapsible loess area[J].Resources Environment&Engineering,2014,28(4):501-505.(in Chinese))
[21]高凌霞.黄土湿陷性的微结构效应及其评价方法研究[D].大连:大连理工大学,2011.(GAO Ling-xia.Study on microstructural effects on collapsibility of loess and its evaluation methods[D].Dalian:Dalian University of Technology,2011.(in Chinese))