基于生石灰和粉煤灰改良硫酸盐渍土强度特性

为得到硫酸盐渍土初始含水率、初始含盐量以及生石灰和粉煤灰掺量对改良后盐渍土强度特性的影响规律。以人工配制硫酸盐渍土为基础，用生石灰和粉煤灰作固化剂，以初始含水率、初始含盐量、生石灰和粉煤灰掺量为试验因素，经正交试验设计进行固化土的无侧限抗压强度试验，获得了7 d无侧限抗压强度值，并选取部分固化土试样进行三轴UU试验。试验结果表明：初始含盐量、生石灰和粉煤灰掺量是影响固化盐渍土无侧限抗压强度的主要因素，且前者影响更为显著；最优固化方案为：初始含水率17%、初始含盐量2%、生石灰和粉煤灰掺量6%＋18%，此时抗压强度为0.541 MPa。

Strength Characteristics of Sulphate Saline Soil Modified by Lime and Fly Ash

In order to obtain the effect of initial moisture content and initial saline content of sulphate saline soil, and lime and fly ash content on strength characteristics of saline soil which had been modified. Based on sulphate saline soil that was prepared artificially, lime and fly ash were used for stabilizer. Factors of initial moisture content, initial saline content, lime and fly ash content were considered, and after orthogonal design, unconfined compressive strength tests of solidified soil were conducted to obtain the 7 days unconfined compressive strength. Likewise, the triaxial test of UU of partial solidified soil samples were carried out. The results indicate that initial saline content and proportion of lime and fly ash are the key factors that affecting unconfined compressive strength of solidified saline soil, and the former has a remarkable influence on it; The best scheme is composed of 17% of initial moisture content with 2% of initial saline content, and mixture with 6% lime and 18% fly ash, and its compressive strength is 0.541 MPa.