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基底桩土刚度差异大和路堤结构性综合作用,使得基底荷载向疏桩集中,产生了疏桩支撑路堤结构的稳定性问题。文章在对路堤结构强度分析的基础上,引入相对刚度判别方法分析疏桩荷载作用下的路堤破坏模式,建立了强度特征破坏模式下承载力塑性解修正的路堤结构抗力计算模型及变形特征破坏模式下基于孔穴扩张理论的结构抗力分析模型,并计算分析了石灰改良土的路堤结构抗力与稳定性。
The large difference of pile-soil stiffness and the structural comprehensive effect of embankment make the load of the foundation concentrate to the sparse pile, resulting in the stability problem of the sparse pile supporting embankment structure. Based on the strength analysis of embankment structure, this paper introduces the method of relative stiffness analysis to analyze the embankment failure mode under the action of sparse pile loading, and builds the resistance calculation model and the deformation failure mode of embankment with the plastic solution of strength failure mode The structural resistance analysis model based on the cavity expansion theory is presented. The resistance and stability of embankment with lime-modified soil are calculated and analyzed.