论文部分内容阅读
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.
In view of the shortcoming that the traditional soil-water characteristic curve tester can not realize the load, a suction-controlled triaxial test device was developed to test the soil-water characteristic curve under different stress states and the effect of stress state on the pore characteristics was discussed. Consolidation pressure and matrix suction can cause irreversible shrinkage deformation of soil.Consolidation pressure is greater, the closer the soil particles, the smaller the pore ratio, the smaller the pore size and number, the worse the permeability, showing better Of the water holding capacity, the air is difficult to enter the soil, soil drainage difficulties, leading to increased intake value and dehumidification rate decreases.Earth-water characteristic curve and the pore structure characteristics are closely related to the stress state is not directly related to the consolidation The effect of pressure on the soil-water characteristic curve is reflected by changing the pore structure characteristics, and the stress state has no effect on the soil-water characteristic curve when the pore structure characteristics are similar.