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为了研究最优含水率、流动上、下限含水率对轻量土性能的影响,通过密度、无侧限抗压强度试验研究了混合土的工程性质。结果表明:采用流动性指标(180 20 mm)控制混合土的流动性基本可行。混合土处于流动性上、下限含水率时,无侧限应力-应变关系曲线几乎重合,流动性上、下限含水率范围内土壤性质较为接近。无侧限抗压强度随含水率增加而衰减,但流动上、下限含水率对应强度差别不大。不管含水率高低,强度随龄期增长,都可以采用双曲线模型进行预测,并且总结了7 d、90 d强度与28 d强度之间的经验关系。当含水率为最优含水率时,混合土基本不收缩;在流动性上、下限含水率范围内,线收缩率范围为1.53%～4.71%,体积收缩率范围为4.53%～13.46%,收缩性受含水率、水泥剂量等因素影响。理想密度模型可以近似预测混合土的湿密度,高含水率时预测值有一定误差,误差范围为3.834%～8.231%。
In order to study the influence of optimal water content, upper and lower water content on the properties of lightweight soil, the engineering properties of mixed soil were studied by density and unconfined compressive strength tests. The results show that it is feasible to control the fluidity of mixed soil by using the liquidity index (180 20 mm). When the mixed soil is in upper and lower fluidity, the unconfined stress-strain curves almost coincide, and the soil properties in the upper and lower water content of the fluidity are close to each other. The unconfined compressive strength decayed with the increase of water content, but the difference between the corresponding upper and lower water content of the flow was not significant. Regardless of moisture content and intensity with age, hyperbolic model can be used to predict and the empirical relationship between intensity of 7 d, 90 d and intensity of 28 d is summarized. When the moisture content is the optimal moisture content, the mixed soil basically does not shrink; in the range of upper and lower fluidity, the linear shrinkage ranged from 1.53% to 4.71%, the volume shrinkage ranged from 4.53% to 13.46% Sex by moisture content, cement dosage and other factors. The ideal density model can predict the wet density of the mixed soil approximately, and the predicted value of the high moisture content has a certain error with the error range of 3.834% ~ 8.231%.