【摘要】 在利用压力板仪测定非饱和土的土-水特征曲线时,常用的取样称量法、溢出水称量法分别存在实测试样质量与实际试样质量不相等、实测排水量与实际排水量不相等等问题,从而造成试验结果失真。为此,溢出水校正称量法被引入用来消除取样称量法及溢出水称量法中存在的问题。通过取样称量法、溢出水称量法、溢出水校正称量法的对比研究发现,在同一基质吸力作用下,由取样称量法、溢出水称量法确定的试样饱和度均小于由溢出水校正称量法确定的试样饱和度,并对该现象进行了解释。随后,对取样称量法、溢出水称量法、溢出水校正称量法的适用范围进行了探讨。更多还原

【Abstract】 Usually,two methods are adopted in using the pressure plate extractor,namely,including the weighing soil method(WSM),which measures the water content by weighing the soil sample when equilibrium is reached;and the weighing outflow method(WOM),which measures the water content by weighing the outflow from the soil sample after equilibrium is attained.In the measurement,however,there are some factors that can adversely influence testing results.For example,with the WSM,part of soil mass may lose,and in using the WOM,the outflow could be overestimated because the air-bubble accumulation and the air-water interface.All these factors may result in error.To resolve the problem,an adjusted method of weighing ouflow is introduced.By comparing the weighing soil method and the weighing outflow method to the adjusted method of weighing outflow,it is shown that at the same matric suction,the saturations determined with the weighing soil method and the weighing outflow method are less than that determined with the adjusted method of weighing outflow.The reasons for this are sought;and the applicabilities of these three methods are discussed.更多还原