上海软土土水特征的室内试验研究

详细介绍了滤纸法、渗析法与气相法3种室内土样吸力量测方法,并采用这3种方法获取了上海浅层②1层土在0～1400 kPa范围以及全吸力范围上的土水特征曲线。由此可得以下结论:①明确上海第②1层软土的进气值在110～250 kPa之间;②上海第②1土层的残余饱和度对应的吸力值约为20 MPa;③上海地区软土的减饱和过程具有明显的阶段特征;④低吸力范围内,上海软土土水特征曲线存在明显的滞后性。

Lab experimental study on soil-water characteristics of Shanghai soft clay

The filter paper method,osmotic method and vapor phase technique for measuring soil suction were introduced.The soil water characteristics curves of the typical Shanghai soil(layer ②1) in a suction range of 0～1400 kPa and a full suction range were obtained using these three lab techniques.From the soil-water characteristic curves obtained,it is clear that,the air-enter value for the testing soil is about 110～250 kPa,the residual saturation degree value is about 20 MPa,the SWCC for desorption process of Shanghai soil shows clearly in step-phase,and for the lower suction range(0～1400 kPa),the soil water characteristics curves for Shanghai soft clay shows significantly in hysteretic loop.