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现多数水泥土防渗工程都间接或直接的与地下腐蚀性介质环境接触,会导致水泥土防渗性能的降低甚至失效。因此,通过室内模拟试验,设计了不同的水泥掺入比,进行了在污水和清水环境下水泥土的渗透性能试验,研究了在不同龄期下水泥土的渗透系数变化规律,并同时分析了渗透后水泥土中离子浓度的变化规律。试验结果表明,在清水环境下,随着龄期的增长,水泥土的渗透系数逐步减小,60 d后随着龄期的增加,水泥土渗透系数减小的程度越来越缓慢;在污水养护条件下,龄期在60 d之前,水泥土渗透系数逐步减小,龄期在60 d之后,由于水泥土被侵蚀,致使水泥土随着龄期的增加,水泥土的渗透系数逐步增大;无论是清水还是污水环境,随着水泥掺量的增大,其渗透系数均逐步降低;在污水环境中,随着龄期的增加,其水泥土中的Ca2+,Mg2+,Cl?,24SO?浓度均逐步增大,而清水环境中Mg2+,Cl?,24SO?浓度均逐步减小。其研究成果可为水泥土防渗工程的抗渗性和耐久性设计和应用提供技术参数,具有重要的工程意义。
Now most of the cement soil seepage control projects are directly or indirectly with the corrosive media underground environment will lead to the cement soil impermeability performance even failure. Therefore, through the indoor simulation test, different cement incorporation ratios were designed, the permeability of cemented soil under sewage and clear water environment was tested, and the variation law of permeability coefficient of cemented soil at different ages was studied. At the same time, Changes of ion concentration in cemented soil. The experimental results show that under the condition of clear water, the permeability coefficient of cement soil gradually decreases with the increase of age. The permeability coefficient of cement soil decreases with the increase of age after 60 d. Under the condition of conservation, the infiltration coefficient of cement soil gradually decreased before the age of 60 days. After the age of 60 days, due to the erosion of cement soil, the permeability coefficient of cement soil gradually increased with the increase of age . The permeability coefficient of both cement and concrete decreased gradually with the increase of cement content in both clear and sewerage environments. In the sewage environment, Ca2 +, Mg2 +, Cl? And 24SO? Concentration gradually increased, while the concentrations of Mg2 +, Cl ?, 24SO? The research results can provide technical parameters for impermeability and durability design and application of cement-soil seepage control project, which has important engineering significance.