不同加载速率和地基处理方式下软土地基稳定性的研究

Study on stability of soft soil foundation under different loading ratesand ground treatment methods

考虑到公路工程建设过程中软地基的稳定性直接影响公路工程的安全性,提出了基于不同加载速率和地基处理方式下软土地基的稳定性研究方法。结合土体弹塑性模型,利用三维有限元数值分析方法对不同工况下软土地基的结构稳定性进行仿真计算。算例结果表明,软土地基的形变速率大小同地基所处的状态稳定等级并无紧密联系,需考虑多种因素后综合决定。而加载速率对软土地基的变形速率影响明显,在实际工程应用中,软土地基的不同处理方式将对其稳定性有重要影响,地基排水性好,将大幅提升软土地基的稳定性,且其稳定性不宜采用单一的变形速率指标来界定。研究可为软土地基下的工程监测提供参考。

Considering that the stability of the soft foundation directly affects the safety of the highway engineering during the construction of highway engineering,this paper proposed a method to study the stability of the soft foundation under different loading rates and foundation treatment methods.Combined with the elastoplastic model of the soil,the three-dimensional finite element numerical analysis method was used to simulate the structural stability of the soft soil foundation under different working conditions.The results of the calculation example show that the deformation rate of the soft soil foundation is not closely related to the stability level of the foundation,and it needs to be determined comprehensively after considering a variety of factors.The loading rate has an obvious influence on the deformation rate of soft soil foundation.In practical engineering applications,different treatment methods of soft soil foundation will have an important impact on its stability.Good foundation drainage will greatly improve the stability of soft soil foundation.Stability should not be defined by a single deformation rate index.In summary,the research results can provide reference information for engineering monitoring under soft soil foundation.