基于化学改性的铁路盐胀病害整治方法研究

Study on Remediation Method of Railway Salt Expansion Disease based on Chemical Modification

为降低硫酸盐渍土的盐胀性,采用素黄土与硫酸钠粉末拌合成硫酸钠含量为2%、4%、6%的土样,分别采用100、300、500、700g/L四种不同浓度,体积为20mL氯化钙溶液对土样进行滴淋,并对滴淋前后的土样进行盐胀试验,分析其效果。试验表明:采用滴淋氯化钙溶液的方法可以有效抑制硫酸盐渍土的盐胀,并对该方法应用于实际工程的可行性进行分析。

In order to reduce the salt expansion of sulfate saline soil, the soil samples containing 2 %, 4 % and 6 % sodium sulfate were mixed with plain loess and sodium sulfate powder. The soil samples were dripped with 100, 300, 500, 700 g/L calcium chloride solution with a volume of 30 ml, and the salt swelling tests were carried out before and after dripping. Experiments show that the method of dripping calcium chloride solution can effectively inhibit the salt expansion of sulfate saline soil, and the feasibility of applying this method to practical engineering is analyzed.