工程科学学报，第39卷，第1期：147-154,2017年1月 Chinese Journal of Engineering,Vol.39,No.1:147-154,January 2017 DOI:10.13374/j.issn2095-9389.2017.01.019;http://journals.ustb.edu.cn 不同应力状态下孔隙结构特征对土-水特征曲线的 影响 陈宇龙”，黄 栋2)四 1)东京大学土木工程系，东京113-8656，日本2)中国科学院山地灾害与地表过程重点实验室，成都610041 区通信作者，E-mail:dhuang@imde.ac.cn 摘要针对传统土-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 下土一水特征曲线试验，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。 固结压力对土一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，应力状态对其土一水特征曲线 不会产生影响. 关键词土-水特征曲线：应力状态：孔隙结构：孔隙比；滞后 分类号TU411 Influence of pore structure characteristics on soil-water characteristic curves under different stress states CHEN Yu-long,HUANG Dong 1)Department of Civil Engineering,University of Tokyo,Tokyo 113-8656,Japan 2)Key Laboratory of Mountain Hazards and Surface Process,Chengdu 610041,China Corresponding author,E-mail:dhuang@imde.ac.cn ABSTRACT Since traditional instruments cannot apply stress in soil-water characteristic curve tests,we develop a suction con- trolled triaxial apparatus,by which soil-water characteristic curve tests are performed under different stress states.Further,the influ- ence 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 consoli- dation pressure causes a less hysteresis. KEY WORDS soil-water characteristic curve;stress state;pore structure;void ratio;hysteresis 收稿日期：2016-02-17 基金项目：国家自然科学基金资助项目(41301009)工程科学学报,第 39 卷,第 1 期:147鄄鄄154,2017 年 1 月 Chinese Journal of Engineering, Vol. 39, No. 1: 147鄄鄄154, January 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 01. 019; http: / / journals. ustb. edu. cn 不同应力状态下孔隙结构特征对土鄄鄄水特征曲线的 影响 陈宇龙1) , 黄 栋2) 苣 1) 东京大学土木工程系, 东京 113鄄鄄8656, 日本 2) 中国科学院山地灾害与地表过程重点实验室, 成都 610041 苣 通信作者,E鄄mail: dhuang@ imde. ac. cn 摘 要 针对传统土鄄鄄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 下土鄄鄄水特征曲线试验,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. 土鄄鄄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. 固结压力对土鄄鄄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,应力状态对其土鄄鄄水特征曲线 不会产生影响. 关键词 土鄄鄄水特征曲线; 应力状态; 孔隙结构; 孔隙比; 滞后 分类号 TU411 Influence of pore structure characteristics on soil鄄鄄 water characteristic curves under different stress states CHEN Yu鄄long 1) , HUANG Dong 2) 苣 1) Department of Civil Engineering, University of Tokyo, Tokyo 113鄄鄄8656, Japan 2) Key Laboratory of Mountain Hazards and Surface Process, Chengdu 610041, China 苣 Corresponding author, E鄄mail: dhuang@ imde. ac. cn ABSTRACT Since traditional instruments cannot apply stress in soil鄄鄄 water characteristic curve tests, we develop a suction con鄄 trolled triaxial apparatus, by which soil鄄鄄water characteristic curve tests are performed under different stress states. Further, the influ鄄 ence 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鄄鄄 water characteristic curve. The soil鄄鄄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鄄鄄water characteristic curve is embodied in pore distribution properties. For similar pore distribution properties, the soil鄄鄄water characteristic curve should be similar regardless of stress state. A larger consoli鄄 dation pressure causes a less hysteresis. KEY WORDS soil鄄鄄water characteristic curve; stress state; pore structure; void ratio; hysteresis 收稿日期: 2016鄄鄄02鄄鄄17 基金项目: 国家自然科学基金资助项目(41301009)