Cement-based stabilization by deep mixing or grouting is a popular method used to enhance soft clay ground because clay gradation has a significant effect on its unconfined compression strength. However, the functional relationship between the gradation and the strength is currently unclear, which limits the assessment and cognition for the strength formation of cement-based stabilized soft clay. Strength experiments controlling the sand ratio were conducted, in addition to the literature review, to clarify the sand incorporation effect on the strength. An effective cement ratio (the mass ratio of cement to involved clay) was proposed to evaluate the strength of stabilized clay with sand incorporation. In order to combat data dispersion and the labour-intensive nature of these experiments, meso-mechanical numerical simulations were carried out by the finite element method. This served to enrich the data and clarify the mesoscopic mechanism. The numerical result indicates that the strength of stabilized clay at low sand incorporation ratio is mainly controlled by the strength of the cement-clay-water matrix, thus verifying the rationality of studying the effective cement ratio. Subsequently, the threshold sand ratio in the cement-clay-water matrix was discussed to optimize the stabilization of soft clay.

通过深度搅拌或灌浆进行水泥基稳定是一种常用的增强软粘土地基的方法，因为粘土级配对其无侧限抗压强度有显着影响。然而，目前尚不清楚级配与强度之间的函数关系，这限制了对水泥基稳定软粘土强度形成的评估和认知。除了文献综述外，还进行了控制砂比的强度试验，以阐明砂掺入对强度的影响。提出了有效水泥比（水泥与参与粘土的质量比）来评估掺砂稳定粘土的强度。为了解决这些实验的数据分散和劳动密集型性质，中观-力学数值模拟是通过有限元方法进行的。这有助于丰富数据并阐明介观机制。数值结果表明，低掺砂比下稳定粘土的强度主要受水泥-粘土-水基体强度的控制，从而验证了研究有效水泥比的合理性。随后，讨论了水泥-粘土-水基质中的临界砂比以优化软粘土的稳定性。