等向应力条件下非饱和原状黄土增湿渗水特性试验研究

张登飞; 陈存礼; 张洁; 贾亚军

doi:10.11779/CJGE201803006

等向应力条件下非饱和原状黄土增湿渗水特性试验研究 English Version

张登飞^1,2,
陈存礼^1,2, ,,
张洁³,
贾亚军^1,4

1. 西安理工大学岩土工程研究所,陕西西安 710048;
2. 西安理工大学陕西省黄土力学与工程重点实验室,陕西西安710048;
3. 北京理正软件股份有限公司,北京 100044;
4. 甘肃林业职业技术学院,甘肃天水 741020

基金项目: 国家自然科学基金项目（50878183）; 陕西省教育厅省级重点实验室重点科研项目（14JS063）; 西安理工大学博士创新基金项目（310-252071509）

详细信息

作者简介:
张登飞(1987-),男,博士,主要从事非饱和土水力与力学特性研究。E-mail:dfzhang1987@163.com。

通讯作者:
陈存礼，E-mail：chencl@xaut.edu.cn

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出版历程
- 收稿日期: 2016-11-08
- 发布日期: 2018-03-24

Experimental study on wetting water permeability of unsaturated intact loess under isotropic stress

1. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an710048, China;
2. Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi'an University of Technology, Xi'an 710048, China;
3. Beijing Leading Software Co., Ltd., Beijing 100044, China;
4. Gansu Forestry Technological College, Tianshui 741020, China

摘要

摘要: 渗水系数是非饱和土固结分析的关键参数之一。用自制的非饱和土三轴剪切渗透仪,在无应力及不同等向应力下分别对不同和相同孔隙比的原状黄土进行了直接向试样分级注水使吸力逐渐减小的增湿渗透试验,分析了孔隙比,应力与饱和度及吸力对增湿渗水系数的影响,对比分析了无应力与应力作用下的渗水特性,提出了可以考虑应力与饱和度或吸力影响的非饱和原状黄土增湿渗水的渗透性函数。研究结果表明：孔隙比和应力对渗水系数与饱和度关系及渗水系数与吸力关系皆有影响,吸力较大时对后者几乎没有影响,可近似归一。无应力及不同应力条件下,只要孔隙比相同,则渗水系数与饱和度或吸力关系相同;相对渗水系数与吸力的关系不能归一,同一吸力对应的相对渗水系数随孔隙比的减小或应力的增大而增大,而相对渗水系数与饱和度及吸力比（吸力与脱气值之比）关系皆可以归一。vG-M模型不适用于描述常孔隙比下原状黄土的渗水系数;提出的渗透函数可以预测一定等向应力作用下增湿过程中饱和度增大及吸力减小时原状黄土的渗水系数,预测结果与试验结果吻合较好。
- 原状黄土 /
- 增湿 /
- 孔隙比 /
- 等向应力 /
- 饱和度 /
- 吸力 /
- 渗水系数
Abstract: The unsaturated water permeability is one of the key parameters in performing consolidation analysis for unsaturated soil systems. A series of unsaturated infiltration tests are performed on the intact loess with various void ratios at null stress and with the same void ratio at different isotropic stresses using the independently developed triaxial equipment for shearing and permeability measurement of unsaturated soils, whereby the suction is reduced incrementally by the direct addition of small amount of water to the sample at a constant isotropic stress. The influences of void ratio, stress, degree of saturation and suction on the water permeability are analyzed. The water permeability at null stress is compared with that at applied stress. The permeability functions to describe the relationships of water permeability versus degree of saturation and suction are respectively proposed for the intact loess at applied stress. The results show that the void ratio and stress have the effect on the relationships of the water permeability versus degree of saturation and suction, and little influences are found on the latter as the suction value is higher than certain threshold suction. The water permeability as functions of both degree of saturation and suction is the same as long as the void ratio is the same at both null stress and different stresses. The relative water permeability versus suction can not be normalized, and the relative water permeability increases with the decreasing void ratio or increasing stress for the same suction. Interestingly, there are all unique relationships of relative water permeability as functions of both degree of saturation and suction ratio (defined as suction to air-occlusion suction ratio). The wetting water permeability for the intact loess is not described by the vG-M model at a given void ratio. The proposed permeability functions can predict the water permeability for the intact loess with both the increase of degree of saturation and the decrease of suction during wetting at a constant isotropic stress. The predicted results are in good agreement with the test ones.
- intact loess /
- wetting /
- void ratio /
- isotropic stress /
- degree of saturation /
- suction /
- water permeability

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参考文献(25)

[1]	谢定义. 非饱和土土力学[M]. 高等教育出版社, 2015. (XIE Ding-yi.Soil mechanics for unsaturated soil[M]. Beijing: Higher Education Press, 2015. (in Chinese))
[2]	LI X, ZHANGL M, FREDLUND D G.Wetting front advancing column test for measuring unsaturated hydraulic conductivity[J]. Canadian Geotechnical Journal, 2009, 46(12): 1431-1445.
[3]	叶为民, 钱丽鑫, 陈宝, 等. 侧限状态下高压实高庙子膨润土非饱和渗透性的试验研究[J]. 岩土工程学报, 2009, 31(1): 105-108. (YE Wei-min, QIAN Li-xin, CHEN Bao, et al.Laboratory test on unsaturated hydraulic conductivity of densely compacted Gaomiaozi bentonite under confined conditions[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(1): 105-108.(in Chinese))
[4]	王勇, 孔令伟, 郭爱国, 等. 含浅层气砂土的赋存特征及其非饱和参数预测[J]. 岩土力学, 2010, 32(7): 1945-1950. (WANG Yong, KONG Ling-wei, GUO Ai-guo, et al.Occurrence characteristics and unsaturated parameters prediction of shallow gassy sand[J]. Rock and Soil Mechanics, 2010, 32(7): 1945-1950. (in Chinese)).
[5]	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 undisturbed and remolded Q₃ loess[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 1020-1027. (in Chinese))
[6]	LALIBERTE G E.Properties of unsaturated porous media[D]. Fort Collins: Colorado State University, 1966.
[7]	ROMERO E, GENS A, LLORET A.Water permeability, water retention and microstructure of unsaturated compacted Boom clay[J]. Engineering Geology, 1999, 54(1/2): 117-127.
[8]	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 laws of fluid motion, suction and pore pressures in unsaturated soil[J]. Chinese Journal of Geotechnical Engineering, 1993, 15(3): 9-20. (in Chinese))
[9]	刘奉银, 张昭, 周冬. 湿度和密度双变化条件下的非饱和黄土渗透函数[J]. 水利学报, 2010, 41(9): 1054-1060. (LIU Feng-yin, ZHANG Zhao, ZHOU Dong.Saturation-density dependent permeability function for unsaturated loess[J]. Journal of Hydraulic Engineering, 2010, 41(9): 1054-1060. (in Chinese))
[10]	赵彦旭, 张虎元, 吕擎峰, 等. 压实黄土非饱和渗透系数试验研究[J]. 岩土力学, 2010, 31(6): 1809-1902. (ZHAO Yan-xu, ZHANG Hu-yuan, LÜ Qing-feng, et al.Experimental study of unsaturated permeability coefficient of compacted loess[J]. Rock and Soil Mechanics, 2010, 31(6): 1809-1902. (in Chinese))
[11]	GALLAGE C, KODIKARAA J, UCHIMURA T.Laboratory measurement of hydraulic conductivity functions of two unsaturated sandy soils during drying and wetting processes[J]. Soils and Foundations, 2013, 53(3): 417-430.
[12]	HUANG S Y, BARBOUR S L, FREDLUND D G.Development and verification of a coefficient of permeability function for a deformable unsaturated soil[J]. Canadian Geotechnical Journal, 1998, 35(3): 411-425.
[13]	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))
[14]	崔颖, 缪林昌. 非饱和压实膨胀土渗透特性的试验研究[J]. 岩土力学, 2011, 32(7): 2007-2012. (CUI Ying, MIAO Lin-chang.Testing study of permeability characteristics of unsaturatedcompacted expansive soils[J]. Rock and Soil Mechanics, 2011, 32(7): 2007-2012. (in Chinese))
[15]	NG C W W, LEUNGA K. Measurements of drying and wetting permeability functions using a new stress- controllable soil column[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2012, 138(1): 58-68.
[16]	陈存礼, 张登飞, 张洁, 等. 等向应力下原状黄土的压缩及增湿变形特性研究[J]. 岩石力学与工程学报, 2017, 36(7): 1731-1747. (CHEN Cun-li, ZHANG Deng-fei, ZHANG Jie, et al.Research on the compression and wetting deformation behavior of intact loess under isotropic stress[J]. Journal of Rock Mechanics and Engineering, 2017, 36(7): 1731-1747. (in Chinese))
[17]	LOBBEZOO J P, VANAPALLI S K.A simple technique for estimating the coefficient of permeability of unsaturated soils[C]// Proceedings of 55th Canadian Geotechnical Conference. Canada, 2002: 1277-1284.
[18]	ELZEFTAWY A, CARTWRIGHT K.Evaluating thesaturated and unsaturated hydraulic conductivity insoils[C]// Permeability and Groundwater Contaminant Transport, ASTM, International, 1981: 168-181
[19]	VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America, 1980, 44(5): 892-898.
[20]	PARKER J C, LENHARD J C, KUPPUSAMY T.A parametric model for constitutive properties governing multiphase flow in porous media[J]. Water Resources Research, 1987, 23(4): 618-624.
[21]	张洁. 三轴应力条件下原状黄土的增湿变形土水特征及渗透特性研究[D]. 西安: 西安理工大学, 2015. (ZHANG Jie.Deformation and soil water characteristics as well as permeability properties of unsaturated intact loess during wetting under triaxial stress[D]. Xi'an: Xi'an University of Technology, 2015. (in Chinese))
[22]	CHEN C L, ZHANG D F, ZHANG J.Influence of stress and water content on air permeability of intact loess[J]. Canadian Geotechnical Journal, 2017, 54(19): 1221-1230.
[23]	XU X B, ZHAN L T, CHEN Y M, et al.Intrinsic and relative permeabilities of shredded municipal solid wastes from the Qizishan landfill, China[J]. Canadian Geotechnical Journal, 2014, 51(4): 1243-1252.
[24]	AGUS S S, LEONG E C, SCHANZ T.Assessment of statistical models for indirect determination of permeability functions from soil-water characteristic curves[J]. Géotechnique, 2003, 53(2): 279-282.
[25]	CAI G Q, ZHOU A N, SHENG D C.Permeability function for unsaturated soils with differentinitial densities[J]. Canadian Geotechnical Journal, 2014, 51: 1456-1467.

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