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为了解释目前盐渍土盐胀率随含水率变化规律的3种不同研究结论,采用2种试验方法进行研究,一种是以含水率作为单一因素变量的盐胀试验,研究盐胀率在含水率单因素影响条件下的变化规律,另一种是以细粒土质砂亚硫酸盐渍土为研究对象,以含盐量、含水率、压实度、上覆荷载为多因素变量的正交试验,研究盐胀率在多因素交互作用下随含水率的变化规律。基于回归方程定义计算公式ω_(in)=-B/(2A)为调节因素,给出盐胀率随含水率变化规律发生改变的界限含水率的影响因素和计算方法。应用调节因素公式分析已有文献试验数据,给出试验中界限含水率的影响因素、变化规律和盐胀率随含水率变化的准确区间,并得出目前3种不同研究结论产生的原因。结果表明:盐胀试验的含水率变化范围影响盐胀率随含水率变化规律的研究结论,而且界限含水率不仅受含盐量影响,同时受试验中其他与含水率有交互作用的因素影响。该公式使得盐胀率随含水率变化规律的研究更加准确。
In order to explain the three different conclusions of the present study on the variation of salt expansion rate of salinized soil with moisture content, two kinds of test methods were used to study the salt expansion test of water content as a single factor variable. Rate of single factor under the influence of changes in the law, and the other is based on fine grained sandy sulfite soil as the object of study, salinity, moisture content, compaction, overlying load as a multi-factor orthogonal Experiments were conducted to study the variation of salt expansion rate with moisture content under the multi-factor interaction. Based on the definition formula of regression equation, ω_ (in) = - B / (2A) as the adjustment factor, the influence factors and calculation methods of the limit moisture content whose salt expansion rate changes with the change of water content are given. By using the formula of adjustment factor, the existing experimental data were analyzed, the influencing factors, variation rules and the exact interval of the change of the salt expansion rate with the water cut were given, and the reasons of the three different conclusions were obtained. The results show that the variation range of the water content in the salt swelled test affects the change law of the salt expansion rate with the water content, and the limit moisture content is affected not only by the salinity but also by other factors that interact with the water content in the test. The formula makes the research on the law of the salt expansion rate with the variation of moisture content more accurate.