净平均应力对非饱和重塑黄土渗水系数的影响

doi:10.11779/CJGE2018S1009

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摘要为了研究净平均应力对非饱和重塑黄土渗水系数的影响,本文借助考虑净平均应力影响的广义土水特征曲线,应用间接方法预估渗水系数。对重塑黄土试样进行了四个控制净平均应力为常数而基质吸力逐步增大的三轴收缩试验。采用Van Genuchten模型对试验获取的土-水特征曲线进行拟合,通过拟合的连续曲线预测了不同净平均应力下非饱和重塑黄土的渗水系数。结果表明：净平均应力对土-水特征曲线的影响有明显规律,同一基质吸力下,净平均应力越大,试样的体积含水率越小,在一定吸力范围内,体积含水率与取对数基质吸力的关系曲线近似呈直线;渗水系数随基质吸力的增大而减小,同一基质吸力下,净平均应力越大渗水系数越小,较低净平均应力下基质吸力与取对数渗水系数的关系曲线近似呈直线,随着净平均应力的增加,关系曲线变为明显的折线。所得的成果为预测黄土地区高填方的增湿变形、降雨入渗下的边坡稳定性评价等方面提供了科学依据。

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关键词 ：非饱和重塑黄土, 基质吸力, 广义土-水特征曲线, 净平均应力, 渗水系数

Abstract：In order to study the influence of the net mean stress on the permeability coefficient of unsaturated remolded loess, an indirect method is used to predict the permeability coefficient through the generalized soil water characteristic curve which involves the effect of net mean stress on SWCC. To get the generalized soil water characteristic curve, four triaxial contraction tests are conducted for remolded loess samples by increasing matrix suction step by step and controlling the net mean stress as constant. Based on the measured generalized soil water characteristic curve, the Van Genuchten model for predicting the permeability coefficient of unsaturated soil is used. The permeability coefficient of every matrix suction under different net mean stresses is calculated. The results show that the permeability coefficient of unsaturated remolded loess decreases nonlinearly with the increase of the matrix suction in the semi-log coordinates. Under the same matrix suction, the smaller the net mean stress, the greater the permeability coefficient. The results may provide a useful basis for the deformation of high embankment and rainfall infiltration of slope stability evaluation in loess regions.

Key words： unsaturated remolded loess matric suction generalized soil-water characteristic curve net mean stress permeability coefficient

收稿日期: 2017-06-11

ZTFLH:

TU43

基金资助:国家自然科学基金项目（11672330,51379220）; 大学生创新训练计划项目（D2016120）

作者简介: 高登辉(1988- ),男,河南确山人,中国水利水电科学研究院博士研究生,主要从事非饱和土力学及工程应用的研究。E-mail: 1403970876@qq.com。

引用本文:

高登辉, 陈正汉, 邢义川, 郭楠, 邓刚, 扈胜霞. 净平均应力对非饱和重塑黄土渗水系数的影响[J]. 岩土工程学报, 2018, 40(S1): 51-56. GAO Deng-hui, CHEN Zheng-han, XING Yi-chuan, GUO Nan, DENG Gang, HU Sheng-xia. Influence of net mean stress on permeability coefficient of unsaturated remolded loess. Chinese J. Geot. Eng., 2018, 40(S1): 51-56.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2018S1009 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2018/V40/IS1/51

[1] 陈正汉, 谢定义, 王永胜. 非饱和土的水气运动规律及其工程性质研究[J]. 岩土工程学报, 1993, 15(3): 9-20.
(CHEN Zheng-han, XIE Ding-yi, WANG Yong-sheng.Experimental studies of fluid motion, suction and pore pressures in unsaturated soil[J]. Chinese Journal of Geotechnical Engineering, 1993, 15(3): 9-20. (in Chinese))
[2] 徐永福, 兰守奇, 孙德安, 等. 一种能测量应力状态对非饱和土渗透系数影响的新型试验装置[J]. 岩石力学与工程学报, 2005, 24(1): 160-164.
(XU Yong-fu, LAN Shou-qi, SUN De-an, et al.New apparatus for measurement of stress effect on permeability of unsaturated soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(1): 160-164. (in Chinese))
[3] 李永乐, 刘翠然, 刘海宁, 等. 非饱和土的渗透特性试验研究[J]. 岩石力学与工程学报, 2004, 23(22): 3861-3865.
(LI Yong-le, LIU Cui-ran, LIU Hai-ning, et al.Testing study on permeability characteristics of unsaturated soil[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(22): 3861-3865. (in Chinese))
[4] CHIU C F, NG C W W. A state-dependent elasto-plastic model for saturated and unsaturated soils[J]. Géotechnique, 2003, 53(9): 809-829.
[5] 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: 892-898.
[6] FREDLUND D G, XING A.Equations for the soil water characteristic curve[J]. Can Geotech, 1994, 31: 521-532.
[7] 姚志华, 陈正汉, 黄雪峰, 等. 非饱和原状和重塑Q₃黄土渗水特性研究[J]. 岩土工程学报, 2012, 34(6): 1020-1027.
(YAO Zhi-hua, CHEN Zheng-han, HUANG Xue-feng, et al.Hydraulic conductivity of unsaturated and remolded Q₃ loess[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 1020-1027. (in Chinese))
[8] 陈正汉, 孙树国, 方祥位, 等. 非饱和土与特殊土测试技术新进展[J]. 岩土工程学报, 2006, 28(2): 147-169.
(CHEN Zheng-han, SUN Shu-guo, FANG Xiang-wei, et al.Recent advances of the measuring technology for unsaturated soils and special soils[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(2): 147-169. (in Chinese))
[9] 中国民航机场建设集团公司和空军工程设计研究局. 延安新区一期综合开发工程地基处理与土石方工程设计[R]. 北京: 中国民航机场建设集团公司和空军工程设计研究局, 2012.
(The Air Force Engineering Research & China Airport Construction Group Corporation. Yan’an new district, foundation treatment and earthwork engineering design of first period of comprehensive development project[R]. Beijing: The Air Force Engineering Research & China Airport Construction Group Corporation, 2012. (in Chinese))
[10] 黄海, 陈正汉, 李刚. 非饱和土在p-s平面上屈服轨迹及土-水特征曲线的探讨[J]. 岩土力学, 2000, 21(4): 316-321.
(HUANG Hai, CHEN Zheng-han, LI Gang.A study on yield locus of unsaturated soils on p-s plane and soil-water characteristic curve[J]. Rock and Soil Mechanics, 2000, 21(4): 316-321. (in Chinese))
[11] FREDLUND D G, RAHARDJO H.Soil mechanics for unsaturated soils[M]. New York: John Wiley & Sons, Inc, 1997.
[12] 高燕燕. 重塑黄土的渗透特性研究[D]. 西安: 长安大学, 2016.
(GAO Yan-yan.Experimental study of permeability characteristics of remolded loess[D]. Xi'an: Chang'an University, 2016. (in Chinese))
[13] 郭鸿. 不同地区重塑Q₃黄土三轴渗透试验研究[D]. 杨陵: 西北农林科技大学, 2009.
(GUO Hong.Experimental study on triaxial seepage of disturbed Q₃ loess in different regions[D]. Yangling: Northwest A&F University, 2016. (in Chinese))