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为研究NH_4~+和SO_4~(2-)耦合侵蚀下水泥土的力学性质,将制备的水泥土试块置于不同浓度的硫酸铵和硫酸钠溶液中进行长期(150 d)浸泡,通过无侧限抗压强度试验,得到无侧限抗压强度随侵蚀溶液浓度和侵蚀时间的变化规律,分析NH_4~+和SO_4~(2-)耦合侵蚀对水泥土力学性质的影响.研究结果表明:低浓度的SO_4~(2-)在初期对水泥土的抗压强度有明显促进作用;当硫酸铵溶液浓度大于9.0 g/L后,相较于NH_4~+,SO_4~(2-)对水泥土的侵蚀占主导地位;NH_4~+对水泥土有一定的侵蚀作用,且随侵蚀浓度的增加而逐步提高;NH_4~+和SO_4~(2-)通过化学侵蚀和晶体膨胀侵蚀,影响水泥土的力学性质.
In order to study the mechanical properties of cemented soil under coupled corrosion of NH_4 ~ + and SO_4 ~ (2-), the cemented soil samples prepared were placed in different concentrations of ammonium sulfate and sodium sulfate solution for long-term (150 d) soaking, The results show that the influence of NH_4 ~ + and SO_4 ~ (2-) coupling erosion on the mechanical properties of cement soil is analyzed. The results show that the low compressive strength Compared with NH4 +, SO4- (2-), the concentration of SO4- (2-) promoted the compressive strength of cement-soil at initial stage. When the concentration of ammonium sulfate solution was more than 9.0 g / L, NH_4 ~ + has a certain degree of erosion on cement-soil, and gradually increases with the increase of erosion concentration. NH_4 ~ + and SO_4 ~ (2-) affect soil-cement by chemical attack and crystal expansion erosion Mechanical properties.