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为确定不同配比轻量土的最优含水率,提出ρd-w模型,qu-w模型,RS-w模型3种最优含水率模型,假设3种模型可以统一表示为开口向下的抛物线函数,从理论上推导出了最优含水率解析式。为检验3种最优含水率模型及确定模型系数,通过试验对轻量土物理力学特性进行了研究。结果表明:轻量土的干密度、无侧限抗压强度、比强随着含水率的增大,先增大后减小,存在最优含水率,曲线形态类似于抛物线。用3种最优含水率模型对实测数据进行回归分析,模型计算得到的最优含水率与图解法直接得到的含水率值是极其接近的。结合前人成果,qu-w模型,RS-w模型对应的最优含水率几乎相同,而与ρd-w模型对应的含水率略有差别,3种模型对应的最优含水率基本上是相同的。轻量土的最优含水率为混合物物理需水与化学需水的总和,是复杂物理化学反应需水量的外在表现,是3种模型具有统一性的理论基础。以RS-w模型为例,计算出了轻量土各组分的质量需水率,与原材料性质关系较为密切。
In order to determine the optimum moisture content of different proportion of light soil, three optimal moisture content models of ρd-w model, qu-w model and RS-w model were proposed. Suppose the three models can be unified as a parabola with downward opening Function, theoretically derived the optimal moisture content analytic formula. To test the three kinds of optimal moisture content model and determine the model coefficients, the physical and mechanical properties of lightweight soil were studied through experiments. The results show that the dry density, unconfined compressive strength and specific strength of lightweight soil increase firstly and then decrease with the increase of water content. The optimal moisture content exists and the shape of the curve is similar to the parabola. Regression analysis of the measured data with the three optimal moisture content models shows that the optimal moisture content calculated by the model is very close to the moisture content obtained directly from the graphical method. According to the previous results, the optimal water cut corresponding to the qu-w model and the RS-w model is almost the same, while the water cut corresponding to the ρd-w model is slightly different. The optimal water cut corresponding to the three models is basically the same of. The optimal moisture content of lightweight soil is the sum of the physical water requirement and the chemical water requirement of the mixture. It is the external manifestation of the complex physical-chemical reaction water demand and is the theoretical basis of the unity of the three models. Taking RS-w model as an example, the mass water rate of each component in light-weight soil was calculated, which is closely related to the properties of raw materials.