三轴应力条件下原状黄土的渗气特性

张登飞; 陈存礼; 陈惠; 刘科

doi:10.11779/CJGE2018S1015

三轴应力条件下原状黄土的渗气特性 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: TU444
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出版历程
- 收稿日期: 2017-06-10
- 发布日期: 2018-08-24

Gas permeability of intact loess under traixial 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: 用改装的三轴渗气仪,在三轴应力条件下对不同含水率原状黄土进行渗气试验,分析了平均应力、偏应力及含水率变化对渗气系数与饱和度关系的影响,提出了考虑三者影响的渗气函数。研究结果表明：偏应力、平均应力及含水率对渗气系数与饱和度关系皆有较大的影响。平均应力（应力比相同）或偏应力（平均应力相同）作用引起饱和度增大时,渗气系数线性减小,且减小程度与含水率的大小有关;含水率增大时渗气系数随饱和度增大而减小的速率比应力增大时的小。不同应力状态下,相对渗气系数与饱和度关系,渗气系数与修正气体饱和度关系皆可归一,且可分别用以总饱和度为参量的P-vG-M模型及本文提出的修正气体饱和度幂函数（MAPL）模型描述,但相比较而言,MAPL模型参数较少,更便于实际工程应用。MAPL模型对渗气系数的预测结果与试验结果吻合较好。
- 原状黄土 /
- 偏应力 /
- 平均应力 /
- 含水率 /
- 渗气系数
Abstract: The gas permeability tests on intact loess with various water contents are performed under traixial stress conditions using the refitted triaxial gas permeability equipment. Influences of changes in the mean stress, deviator stress and water content on gas permeability as a function of liquid saturation are analyzed. The gas permeability function considering their effects is proposed. The results show that the relationships between gas permeability and liquid saturation are affected clearly by the deviator stress and mean stress as well as water content. The gas permeability decreases linearly with the increase of liquid saturation resulted from the mean stress with constant stress ratio or deviator stress with constant mean stress, and the decreasing degree is dependent on the value of water content. The decreasing rate of gas permeability with the increase of liquid saturation is smaller during the increasing water content than that during increasing stress. There are all unique relationships between the relative gas permeability and the liquid saturation between the gas permeability and the modified gas saturation at different stress states. These relationships can be predicted by the P-vG-M model in term of the total liquid saturation and proposed modified gas saturation power law (MAPL) model, respectively. In comparison with the P-vG-M model, the MAPL model with less parameters is more convenient for engineering application. The predicted results of gas permeability by MAPL model are in good agreement with the test ones.
- intact loess /
- deviator stress /
- mean stress /
- water content /
- gas permeability

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参考文献(13)

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