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通过模拟试验的方法探讨了在不同H2SO4侵蚀环境下不同龄期(0~28d)的水泥土表观变化和抗压强度衰减规律,得出了水泥土表面腐蚀程度随着侵蚀时间的增长和H2SO4介质浓度的增大而增加,水泥土抗压强度随H2SO4浓度的增大而减小;分析了H2SO4溶液的pH值和SO42-浓度随时间的变化关系,得出随着时间的增长侵蚀溶液的pH值增大,SO42-浓度则呈下降趋势。研究认为:受H2SO4侵蚀的水泥土强度改变与环境溶液的pH值、SO42-浓度和时间密切相关。在此基础上建立了考虑H2SO4侵蚀环境下pH值、SO42-浓度、时间多因素的多元线性回归的水泥土强度Q-T,pH,S模型,经对比预测值与实测值,证明两者比较接近,差值说明模型的具有一定的可行性,可供工程设计参考。
Through the simulation experiment, the apparent change of cement soil and the decrement of compressive strength at different ages (0 ~ 28d) under different H2SO4 erosion conditions were discussed, and the corrosion degree of cement soil with erosion time and H2SO4 The compressive strength of cement soil decreases with the increase of H2SO4 concentration. The relationship between the pH value and SO42- concentration of H2SO4 solution with time is analyzed. It is concluded that the erosion of solution pH value increased, SO42- concentration showed a downward trend. The results show that the strength of cement-soil eroded by H2SO4 is closely related to the pH, SO42- concentration and time of environmental solution. On this basis, the QT, pH and S models of cement-soil strength were built by considering the multiple linear regression of pH value, SO42- concentration and time under the H2SO4 erosion environment. The predicted values and measured values were compared to prove that they are close to each other, Difference specification model has a certain feasibility for engineering design reference.