松嫩平原碳酸盐渍土的工程特性

对东北松嫩平原的碳酸盐渍土进行了勘察和室内试验分析,结果表明碳酸盐渍土在1 m以内土壤含盐量随深度增加呈现先增加后减小的趋势,在深度50~75 cm的土层内含易溶盐最多,其中阳离子以Na+为主,阴离子以HCO-为主;土壤的pH值在9.58~10.08之间,碱性较强;通过人工配盐,测得碳酸盐渍土随着含盐量的增大,土的液塑限都有所提高;通过膨胀试验发现:当碳酸盐含量大于0.5%时,膨胀量显著增大,当含盐量从0.5%逐渐增加到2.0%时,它的膨胀率最大可以达到23%;同时土体的抗剪强度与含盐量也有密切的关系,当土的含盐量增加时,黏聚力有减小的趋势,而内摩擦角先减小后增大。

Characteristics of Carbonate Saline Soil in the Songnen Plain

By Surveying and mechanical test of carbonate saline soil in the Songnen Plain,the results showed that the soil salinity of the carbonate saline soil increased at first and then decreased with the depth increasing within one meter.Soluble salt was most in the soil with a depth of 50~75 cm,where the cations were dominated by Na+ and anions were dominated by HCO-3,and pH ranged from 9.58 to 10.08 with strong alkalinity.By adding the different salt content to soil artificially,it was gained that the soil liqui...