不同过筛粒径取样对粗粒盐渍土易溶盐试验结果的影响研究

Impact of Different Sieving Diameter Sampling on Test Result of Soluble Salt for Coarse-grained Saline Soil

为了研究现行粗粒盐渍土易溶盐试验方法的合理性,在分析现行规范方法和关于易溶盐测试试验方法研究成果的基础上,选取典型粒径组合条件下的人工配制粗粒盐渍土和天然盐渍土,开展单次降温盐胀试验和多次冻融循环盐胀试验及结果分析,初步确定粗粒盐渍土易溶盐测试试验所取土样的合理过筛粒径;最后,通过室内重配土的易溶盐测试试验进一步验证其合理性。结果表明:利用过5mm筛孔的烘干土样进行粗粒盐渍土的易溶盐试验,能更好地反映其实际工程特性,试验结果也更具代表性。

In order to study the rationality of the test method of the soluble salt for the coarse-grained saline soil, based on the analysis of the existing test methods for soluble salts, well coarse-grained saline soil in typical particle size combination are selected to carry out the single temperature drop salt expansion test and freezing-thawing cycles and salt expansion test. Through the analysis of results, the reasonable sieve diameters of soil sample, which is selected to conducted soluble salt test for coarse grain saline soil, is preliminary determined. At the same time, the experiment of soluble salts for configured saline soil is performed to further explain its rationality. Results show that using drying soil which pass 5mm mesh to carry out the test method for soluble sait in coarse grain saline soil can better reflect the actual engineering characteristics, and the test results are more representative.