干旱环境下氯盐和硫酸盐对遗址土体强度的影响

为了探讨氯盐和硫酸盐对遗址土体强度的影响，本文通过室内试验，对洗盐后的素土分别以0.2%的梯度加入NaCl和Na2SO4两种可溶盐，测试特定盐分含量和类别的含盐土在干旱环境下的单轴抗压强度、抗拉强度、弹性波速以及抗风蚀能力的变化。试验结果表明：在室内环境条件下，盐分的存在对土体起着一定的胶结固化作用，使得土体的强度表现出相应程度的增大，并且硫酸盐对土体的胶结固化作用比氯盐显著。随着盐分含量的增加，含盐试样的单轴抗压强度、抗拉强度呈现出指数形式的增大； 垂直于压制方向和平行于压制方向的弹性波速均呈现出增大的趋势； 随着挟沙风速的增大，试样的风蚀损失量增加，同时在18ms-1的挟沙风速作用下，随着盐分含量的增加，试样的风蚀损失量逐渐减小，含盐试样表现出渐进破坏的形式。

INFLUENCE ON STRENGTH OF SITE SOILS ABOUT CHLORINE AND SULFATE SALT IN DRY ENVIRONMENT

In order to explore the influence of salt content on strength of site soils, this paper is based on the laboratory test that join in two soluble salts with the gradient of 0.2% of NaCl and Na2SO4 to the desalination soil, and test the change of uniaxial compressive strength, tensile strength, elastic wave velocity and the ability to resist wind erosion of the soils which include particular and category saline in dry environment. The results show：under the condition of indoor environment, the existence of salt plays the role of a certain cement solidified to site soils, making the strength of the soil corresponding increase, and the cement solidification of sulfate is more than chlorine salt significantly to soils. The uniaxial compressive strength and tensile strength present the form of index increased; the elastic wave velocity in vertical and parallel direction of the suppression present increasing trend with the increasing of salt content; the loss of wind erosion increases with the increasing speed of carrying sand wind, and under the speed of 18ms-1 of carrying sand wind, the loss of wind erosion decreases with the increasing speed of carrying sand wind to salt samples. It showed the form of gradual damage.