冻融循环条件下水泥固化铅污染土强度模型研究

以冻融循环条件下水泥固化铅污染土为研究对象，通过室内试验研究冻融条件下水泥固化铅污染土的抗压强度特性。试验结果表明：水泥固化铅污染土的强度随水泥掺量增大而增大，随冻融循环次数的增加先略微增加，达到峰值后，随冻融循环次数的增加而快速减小，最后趋于稳定。随着冻融循环次数的增加，不同铅离子浓度的固化铅污染土的强度损失量不同，并表现出在相同水泥掺量下，铅离子浓度为0.5%的固化污染土抗压强度损失量最小。通过回归分析，建立了水泥固化铅污染土强度随冻融循环次数变化的预测模型，为实际工程提供理论参考。

Research of the strength model of cement solidified lead-contaminated soil under freezing and thawing cycles

In this paper, the cement solidified contaminated soil was taken as a research object, and a unconfined compressive strength test of solidified contaminated soil under freezing and thawing cycles were carried out in laboratory. The test results showed that the strength of cement solidified lead contaminated soil increased with cement content, and the compressive strength of solidified contaminated soil increased with freezing and thawing cycles at first and reaching a peak, then it decreased with freezing and thawing cycles. With the increase of freezing and thawing cycles, the unconfined compressive strength loss of the solidified contaminated soil with lead ion concentration was different, with a minimum compressive strength loss at the lead ion concentration of 0.5%. Through data fitting, a strength prediction model of the solidified contaminated soil with freezing and thawing cycles can be achieved, which can be used in actual project.