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通过室内模拟,研究水泥土在侵蚀环境下强度变化,在指定龄期取出土样测定其剪切强度,拍摄对应的微结构图像,从而了解侵蚀溶液对水泥土的侵蚀机理。研究结果表明:侵蚀溶液作用下同时期水泥土强度均小于自然养护方式下水泥土强度;随着侵蚀日期的增长,HCl溶液、Na2SO4溶液及NaCl溶液作用下的水泥土强度呈继续下降趋势,无污染水及NaOH溶液作用下水泥土强度呈上升趋势;水泥土的侵蚀主要来自于Cl-和SO42-,同时SO42-对水泥土的侵蚀作用比Cl-更显著;水泥土微结构量化参数随着侵蚀时间的增长均发生了显著变化,且具有一定的规律性,证明水泥土侵蚀强度与微结构量化参数有显著的相关性,建立了侵蚀环境下水泥土抗剪强度指标与微结构参数的线性回归关系式。
Through indoor simulation, the change of strength of cement soil under erosion environment was studied. The shear strength of cement soil was removed at specified age, and the corresponding microstructure images were taken to understand the erosion mechanism of cement solution by soil erosion. The results show that the strength of cemented soil at the same time is lower than that of natural cemented soil under the action of erosion solution. With the increase of erosion date, the strength of cemented soil under HCl solution, Na2SO4 solution and NaCl solution continues to decline, The strength of cement soil under the action of water and NaOH solution is on the rise. The erosion of cement soil mainly comes from Cl- and SO42-, while the erosion effect of SO42- on cement soil is more significant than Cl-. The quantitative parameters of cement soil microstructure with erosion time The results show that the erosion intensity of cement-soil has a significant correlation with the quantitative parameters of microstructure, and the linear regression relationship between the shear strength index and microstructure parameters of cement-soil under erosion environment is established .