土凝岩改良盐渍土干湿循环试验研究

Experimental Study on Dry-wet Cycle of Saline Soil Ameliorated by Tuff

盐渍土是广泛存在于我西北地区的一种工程性质较差的路基填土,通过采用土凝岩进行盐渍土的改良研究,通过对不同干湿循环次数、不同含盐量和不同掺量的土凝岩改良盐渍土的无侧限抗压强度试验,得出以下结论:土凝岩改良盐渍土的无侧限抗压强度随着干湿循环次数的增加整体呈减小的趋势,经过四次干湿循环后强度趋于稳定,衰减幅度为29%左右,在干湿循环条件下,土凝岩改良盐渍土的无侧限抗压强度随含盐量的增加先增加后减小,随土凝岩的掺量的增加而增加,当含盐量和土凝岩掺量分别增加到3.9%和12%左右强度基本趋于稳定.

Saline soil is a kind of roadbed filling with poor engineering properties which widely exists in the northwest of China.In this paper,the improvement of saline soil is studied by using soil tuff.Through the unconfined compressible strength test of saline soil improved by soil tuff with different drying and wetting cycles,different salt content and different content,the following conclusions are obtained.The unconfined compressible strength of improved saline soil by soil tuff tends to decrease with the increase of the number of dry-wet cycles.After four dry-wet cycles,the strength tends to be stable,with the attenuation range of about 29%.Under the condition of dry-wet cycles,the unconfined compressible strength of improved saline soil by soil tuff increases first and then increase with the increase of salt content.The strength tends to be stable when the salt content and the content of soil tuff increase to 3.9% and 12%,respectively.