考虑软土蠕变效应的路基沉降有限元反演分析

提出了考虑软土蠕变效应的路基沉降有限元反演分析方法,通过Matlab语言将Abaqus有限元分析软件嵌入改进的鲸鱼算法中,实现了软土地层计算参数快速而又准确的获取。并采用修正的Drucker-Prager屈服准则模型与"时间硬化"蠕变法则耦合模型模拟考虑蠕变效应的路基土体的沉降变形情况。为了验证该方法的可靠性,构建了某跨越软土地区的高速公路路基有限元反演模型,模拟了整个施工期内路基的变形情况,结果表明,反演分析得到的路基变形情况与实测值有较高的一致性。另外,利用反演分析得到的计算参数预测了工后10年的路基与路面的沉降情况,为该公路的运行与管理提供很好的理论指导。

Finite Element Inverse Analysis for Soft Soil Subgrade Settlement Considering Creep Behavior

The finite element inversion analysis method, allowing for describing the creep behavior of soft soil, is presented for simulating the subgrade settlement. The finite element analysis software, ABAQUS, was embedded into the improved whale algorithm by MATLAB, thus the calculation parameters of soft soil can be obtained quickly and accurately. The modified Drucker-Prager and time hardening creep model were used to simulate the subgrade settlement and deformation. In order to test the reliability of the proposed method, the finite element inversion model was built for a highway subgrade crossing soft soil and the deformation of the subgrade was simulated during the whole construction period. The simulation results indicate that the subgrade deformation obtained by the inversion analysis agreed well with the measured data. In addition, the post-construction settlement was also predicted and the settlement was within 10 cm in ten years after construction, which provides good theoretical guidance for the operation and management of the highway.