不同应力状态下孔隙结构特征对土-水特征曲线的影响
Influence of pore structure characteristics on soil-water characteristic curves under different stress states
查看参考文献30篇
文摘
|
针对传统土-水特征曲线测试仪无法实现荷载作用的不足,研制吸力控制式三轴试验装置,开展不同应力状态作用下土-水特征曲线试验,讨论应力状态对孔隙特征的作用. 结果表明,固结压力和基质吸力均能使土体产生不可逆的收缩变形. 固结压力越大,土颗粒就越紧密,孔隙比越小,孔隙尺寸和数量越小,渗透性越差,表现出较好的持水能力,空气难以进入土体,土体排水困难,导致进气值增大和减湿率减小. 土-水特征曲线与孔隙结构特征的关系紧密,与应力状态无直接关系.固结压力对土-水特征曲线的影响是通过改变孔隙结构特征来体现的. 孔隙结构特征相近时,应力状态对其土-水特征曲线不会产生影响. |
其他语种文摘
|
Since traditional instruments cannot apply stress in soil-water characteristic curve tests,we develop a suction controlled triaxial apparatus,by which soil-water characteristic curve tests are performed under different stress states. Further,the influence of stress state on the pore characteristics is discussed. The results show that both consolidation pressure and matrix suction can lead to the irreversible contraction deformation of soil. The soil under a larger consolidation pressure has a denser structure and a less void,leading to a smaller pore size and quantity. So it results in a worse permeability. Accordingly,it shows a better water retentivity. Air can hardly enter and water can hardly drain out,which give rise to a larger air entry value and a smaller slope of the soil-water characteristic curve. The soil-water characteristic curve of a compacted soil mainly depends upon current void ratio,not directly upon stress state. The influence of consolidation pressure on the soil-water characteristic curve is embodied in pore distribution properties. For similar pore distribution properties,the soil-water characteristic curve should be similar regardless of stress state. A larger consolidation pressure causes a less hysteresis. |
来源
|
工程科学学报
,2017,39(1):147-154 【核心库】
|
DOI
|
10.13374/j.issn2095-9389.2017.01.019
|
关键词
|
土-水特征曲线
;
应力状态
;
孔隙结构
;
孔隙比
;
滞后
|
地址
|
1.
东京大学土木工程系, 日本, 东京, 113-8656
2.
中国科学院山地灾害与地表过程重点实验室, 中国科学院山地灾害与地表过程重点实验室, 成都, 610041
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
2095-9389 |
学科
|
建筑科学 |
基金
|
国家自然科学基金资助项目
|
文献收藏号
|
CSCD:5926843
|
参考文献 共
30
共2页
|
1.
Fredlund D G. The relationship of the unsaturated soil shear to the soil-water characteristic curve.
Can Geotech J,1996,33(3):440
|
被引
89
次
|
|
|
|
2.
Oberg A L. Determination of shear strength parameters of unsaturated silts and sands based on the water retention curve.
Geotech Test J,1997,20(1):40
|
被引
19
次
|
|
|
|
3.
Huang S Y. Development and verification of a coefficient of permeability function for a deformable unsaturated soil.
Can Geotech J,1998,35(3):411
|
被引
18
次
|
|
|
|
4.
Lim P C. The influence of degree of saturation on the coefficient of aqueous diffusion.
Can Geotech J,1998,35(5):811
|
被引
3
次
|
|
|
|
5.
Gallage C. Laboratory measurement of hydraulic conductivity functions of two unsaturated sandy soils during drying and wetting processes.
Soils Found,2013,53(3):417
|
被引
9
次
|
|
|
|
6.
Ng C W W. Influence of stress state on soil-water characteristics and slope stability.
J Geotech Geoenviron Eng,2000,126(2):157
|
被引
42
次
|
|
|
|
7.
谈云志. 固结作用下粉土的持水性能与细观机制研究.
岩土力学,2013,34(11):3077
|
被引
4
次
|
|
|
|
8.
Tavakoli Dastjerdi M H. Effect of confining stress on soil water retention curve and its impact on the shear strength of unsaturated soils.
Vadose Zone J,2014,13(5):1
|
被引
9
次
|
|
|
|
9.
Irfan M. Modified triaxial apparatus for determination of elastic wave velocities during infiltration tests on unsaturated soils.
KSCE J Civ Eng,2016,20(1):197
|
被引
2
次
|
|
|
|
10.
Pham H Q.
A Volume-Mass Constitutive Model for Unsaturated Soils[Dissertation],2005
|
被引
1
次
|
|
|
|
11.
陈仲颐.
土力学,1994
|
被引
204
次
|
|
|
|
12.
胡孝彭. 应力状态对土-水特征曲线的影响规律.
河海大学学报(自然科学版),2013,41(2):150
|
被引
4
次
|
|
|
|
13.
Miller C J. Impact of soil type and compaction conditions on soil water characteristic.
J Geotech Geoenviron Eng,2002,128(9):733
|
被引
29
次
|
|
|
|
14.
Hu R. A water retention curve and unsaturated hydraulic conductivity model for deformable soils:consideration of the change in pore-size distribution.
Geotechnique,2013,63(16):1389
|
被引
16
次
|
|
|
|
15.
Zhou A N. Modelling the effect of initial density on soil-water characteristic curves.
Geotechnique,2012,62(8):669
|
被引
23
次
|
|
|
|
16.
Fleureau J M. Aspects of the behaviour of compacted clayey soils on drying and wetting paths.
Can Geotech J,2002,39(6):1341
|
被引
5
次
|
|
|
|
17.
沈珠江. 广义吸力和非饱和土的统一变形理论.
岩土工程学报,1996,18(2):1
|
被引
87
次
|
|
|
|
18.
Bolt G E. Physico-chemical analysis of the compressibility of pure clays.
Geotechnique,1956,6(2):86
|
被引
37
次
|
|
|
|
19.
张俊然. 吸力历史对非饱和土力学性质的影响.
岩土力学,2013,34(10):2810
|
被引
10
次
|
|
|
|
20.
戚国庆. 基质吸力变化引起的体积应变研究.
工程地质学报,2015,23(3):491
|
被引
4
次
|
|
|
|
|