自密实固化土的冻融循环力学特性试验研究

Experimental Study on Mechanical Properties of Self Compacting Solidified Soil Under the Function of Freeze-thaw Cycle

为了探究冻融循环对自密实固化土力学性能的影响规律,通过试验对比分析了不同流动度、不同水泥掺量的自密实固化土在不同冻融循环次数下的无侧限抗压强度.试验结果表明:随着冻融循环次数的增加,冻融循环对自密实固化土无侧限抗压强度的影响程度在逐渐减小;相同的冻融循环次数和水泥掺量条件下,流动度越大,自密实固化土的强度衰减率越大;相同的冻融循环次数和流动度条件下,随着水泥掺量的增大,自密实固化土的强度衰减率先减小后增大;在此基础上,构建了自密实固化土的冻融循环强度损伤模型,该模型可为特定条件下自密实固化土的配合比设计提供参考.

In order to explore the influence of freeze-thaw cycle on the mechanical properties of self-compacting solidified soil,the unconfined compressive strengths of self-compacting solidified soils with different fluidity and different cement contents under different freeze-thaw cycle times were analyzed through experiments. The results show that with the increase of freeze-thaw cycle times,the influence degree of freeze-thaw cycle on the unconfined compressive strength of self-compacting solidified soil decreases gradually. Under the same freeze-thaw cycle times and cement content,the greater the fluidity,the greater the strength decay rate of self-compacting solidified soil. Under the same freeze-thaw cycle times and fluidity,with the increase of cement content,the strength decay rate of self-compacting solidified soil decreases first and then increases. On this basis,the freeze-thaw cycle strength damage model of selfcompacting solidified soil is established,which can provide reference for the mix ratio design of self-compacting solidified soil under specific conditions.