三轴应力条件下原状黄土的吸湿渗水特性

张登飞; 陈存礼; 陈惠; 刘科

doi:10.11779/CJGE2018S1008

三轴应力条件下原状黄土的吸湿渗水特性 English Version

张登飞^{1, 2},
陈存礼^1,2, ,,
陈惠³,
刘科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. 中国电建集团西北勘测设计研究院有限公司,陕西西安 710065;
4. 西北综合勘察设计研究院,陕西西安 710003

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

中图分类号: TU44
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出版历程
- 收稿日期: 2017-06-10
- 发布日期: 2018-08-24

Wetting permeability of intact loess under triaxial stress conditions

ZHANG Deng-fei^{1, 2},
CHEN Cun-li^1,2, ,,
CHEN Hui³,
LIU Ke⁴

1. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China;
2. Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi'an University of Technology, Xi'an 710048, China;
3. PowerChina Northwest Engineering Corporation Limited, Xi'an 710065, China;
4. Northwest Research Institute of Engineering Investigation and Design, Xi'an 710003, China

摘要

摘要: 以原状黄土为研究对象,用改装的非饱和土三轴剪切渗透仪,在三轴应力条件下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,分析了相同净平均应力p下偏应力q变化、相同应力比η下净平均应力p变化及饱和度S_r变化时对渗水系数的影响。研究结果表明：偏应力q、净平均应力p及饱和度S_r对渗水系数皆有较大的影响,且影响程度存在差异性。p,q一定,随着S_r增大渗水系数呈先快速后缓慢增大的趋势。S_r一定,随着q增大（p相同）或p增大（η相同）渗水系数皆呈近似线性减小趋势,前者的斜率与p大小有关,而与S_r大小无关;后者的斜率与η大小无关,而与S_r大小有关,且皆小于前者。不同净平均应力下饱和渗水系数与应力比之间皆可用指数函数描述,且仅一个参数随着净平均应力而变化。不同应力状态下相对渗水系数与饱和度关系可近似归一,无法用VG-M模型来描述,但可用本文提出的模型描述。该模型直接把净平均应力与应力比作为变量,便于实际工程应用。模型预测与试验结果吻合较好。
- 原状黄土 /
- 净平均应力 /
- 偏应力 /
- 饱和度 /
- 渗水系数
Abstract: A series of unsaturated infiltration tests on intact loess are performed using the refitted triaxial equipment for shearing and permeability measurement of unsaturated soil, whereby the suction is reduced incrementally by the direct addition of small amounts of water to the sample at constant triaxial stresses. Influences of changes in deviator stress q with constant mean net stress p, mean net stress p with constant stress ratio η and degree of saturation S_ron liquid permeability are analyzed. The results indicate that the deviator stress q, mean net stress p and degree of saturation S_r remarkably affect the coefficient of permeability, and these impacts are different. The coefficient of permeability exhibits first rapid and then slight increase in S_r with constant p and q. It decreases linearly with the increase in q with constant p or in p with constant η at the same S_r. The slope of the former is dependent on p, but irrelevant to S_r. That of the latter is dependent on S_r, but independent of η. Besides, the slope of the latter is lower than that of the former. The saturated coefficient of permeability as a function of stress ratio for different mean net stresses can be expressed by the exponential function, in which only one of parameters changes with the mean net stress. The relationship between the relative coefficient permeability and the degree of saturation can be considered as the unique at different stress states. These relationships are not described by VG-M model, but by the proposed models. The models taking the net mean stress and stress ratio as variables are more convenient for engineering application. The predicted results agree well with the test ones.
- intact loess /
- net mean stress /
- deviator stress /
- degree of saturation /
- coefficient of permeability

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参考文献(18)

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施引文献(8)

期刊类型引用(4)

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3.	Jiading WANG，Yuanjun XU，Dengfei ZHANG，Tianfeng GU. Vibration-induced acceleration of infiltration in loess. Science China(Earth Sciences). 2021(04): 611-630 . 必应学术
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