中文摘要：

通过不同初始孔隙比条件下的土水特征试验及增湿试验,研究了膨胀土的土水特征曲线拟合参数及体积膨胀曲线拟合参数与初始孔隙比的关系,采用曲面拟合法建立了孔隙比与重量含水率及初始孔隙比的关系曲面、孔隙比与吸力及初始孔隙比的关系曲面、重量含水率与吸力及初始孔隙比的关系曲面、体积含水率与吸力及初始孔隙比的关系曲面。试验结果表明,在重量含水率（或吸力）–初始孔隙比–孔隙比坐标系中的体变曲面由饱和部分及非饱和部分组成;在增湿过程中,曲面由非饱和区进入饱和区的转折点对应的重量含水率随着初始孔隙比的增大而增大,转折点对应的吸力随着初始孔隙比的增大而减小;在吸力–初始孔隙比–重量含水率或体积含水率坐标系中,与特定初始孔隙比对应的土水特征曲线是纵坐标恒定的平面曲线;在吸力–孔隙比–重量含水率或体积含水率坐标系中,与特定初始孔隙比对应的土水特征曲线是纵坐标在变化空间曲线,它能同时表示初始孔隙比的影响及试验过程中孔隙比的变化。

英文摘要：

By means of soil water characteristic tests and wetting tests under different initial void ratios, the relationship between the initial void ratio and the fitting parameters of soil water characteristic curve and volume change curve are discussed. Surface fitting is carried out to establish the relationships among void ratio？gravimetric water content？initial void ratio, void ratio？suction？initial void ratio, gravimetric water content？suction？initial void ratio and volumetric water content？suction？initial void ratio. The test results show that in the gravimetric water content （or suction）？initial void ratio？void ratio coordinate, the volume change surface contains saturation and unsaturation parts. In the wetting process, the gravimetric water content at turning point between saturation and unsaturation parts increases with the initial void ratio, while the suction at this point decreases on the contrary. In the suction？initial void ratio？gravimetric water content （or volumetric water content） coordinate, the soil water characteristic curves that correspond to the specific initial void ratios are plane curves with constant vertical coordinates. However, in the suction？void ratio？gravimetric water content （or volumetric water content） coordinate, the soil water characteristic curves that correspond to the specific initial void ratios are space curves with variable vertical coordinates, which can reflect the influences of both the initial void ratio and the variation of the void ratio during test process.