盐分侵蚀对水泥固化土力学特性的影响研究

Effect of Salt Erosion on Mechanical Properties of Cement-solidified Soil

探究海水环境下水泥固化土强度劣化特性对推进水泥固化土在海洋工程的应用具有重要意义。本文以天然海盐溶液为侵蚀环境,以硫酸钠及氯化钠溶液为对照组,在控制溶液浓度和浸泡龄期下开展了一系列室内试验研究。试验结果表明:海盐溶液对水泥固化土的侵蚀作用要大于氯化钠溶液,小于硫酸钠溶液;侵蚀溶液中盐分的浓度越高,对固化土的侵蚀越严重;浸泡龄期28 d时,30,50 g/L海盐溶液中固化土的强度相对于清水溶液分别降低了61.1%,75.4%。在侵蚀作用前期,水泥固化土的强度会随着龄期的增加而增加;当浸泡龄期达到28 d时,所有浸泡溶液中水泥固化土的强度均有不同程度的降低。分析了不同侵蚀环境下水泥固化土强度劣化的机理,为水泥固化土在侵蚀环境中的应用提供一定的理论依据。

It is of great significance to explore the strength degradation characteristics of cement-solidified soil in seawater environment to promote the application of cement-solidified soil in Marine engineering. In this paper, a series of laboratory experiments were carried out with natural sea salt solution as erosion environment and sodium sulfate and sodium chloride solution as control group under the control of solution concentration and immersion age. The results show that the erosive effect of sea salt solution on cement-solidified soil is between sodium sulfate solution and sodium chloride solution;The higher the concentration of salt in the erosion environment, the more serious the erosion of solidified soil;At 28 d of soaking age, the strength of solidified soil in 30 g/L and 50 g/L sea salt solution decreased by 61.1% and 75.4%, respectively, compared with that in clear aqueous solution;In the early stage of erosion, the strength of cement-solidified soil will increase with the increase of age;When the soaking age reaches 28 d, The strength of cement-solidified soils decreased to varying degreesin all soaking solutions.The mechanism of strength deterioration of cement-solidified soil under different erosion environment was analyzed, which provided certain theoretical basis for the application of cement-solidified soil in erosion environment.