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为了探讨盐分对遗址土体颗粒级配和界限含水率的影响,通过室内试验,对洗盐后的素土分别以0(素土),0.2%,0.4%,0.6%,0.8%,1.0%的梯度加入NaCl,Na_2SO_4两种可溶盐,测试特定盐分质量分数和类别的含盐土的颗粒粒径分布和界限含水率的变化.试验结果表明:盐分对遗址土体的颗粒级配有一定的影响,尤其对黏粒占比的变化影响显著,随着盐分质量分数的增大,分布在细粉粒和黏粒范围内的颗粒占比相对减小,分布在粗粉粒和砂粒范围内的颗粒占比相对增加,并且Na_2SO_4盐对土体颗粒级配的影响比NaCl盐的显著;随着盐分质量分数的增大,含盐试样的液限含水率、塑限含水率以及塑性指数均逐渐减小,试样由粉质黏土变为粉土,由于盐分的加入,盐分作为电解质对土粒产生团聚作用,黏粒被吸附,使得试样中黏粒占比相对减少.
In order to investigate the effects of salinity on the grading of grain and the limiting moisture content of the soil in the site, the contents of 0 (plain soil), 0.2%, 0.4%, 0.6%, 0.8%, 1.0% NaCl and Na_2SO_4 were added into the gradient to test the changes of the particle size distribution and the limit moisture content of the salt-containing soil with specific salt content and type.The results showed that the salt content had a certain In particular, with the increase of salt mass fraction, the proportion of particles distributed in the range of fine powder and clay particles is relatively decreased, distributed in the range of coarse powder and grit And the proportion of particles increases relatively, and the effect of Na_2SO_4 salt on the grading of soil particles is more significant than that of NaCl salt. With the increase of salt mass fraction, the liquid limit moisture content, plastic limit moisture content and plasticity index Gradually decreased, the sample from silty clay into silt, due to the addition of salt, salt as electrolyte on the occurrence of agglomeration of soil particles, clay particles are adsorbed, making the sample relatively reduced proportion of clay.