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结合软土变形的大位移、大应变、渗透固结及依时性特点,采用黏弹塑(西原)模型模拟土骨架,建立了分析软土地基的大应变黏弹塑性有限元列式和迭代求解算法,并采用动态“生”“死”单元模拟路堤的施工过程,建立了软土路基双重非线性渗透固结分析模型,研制了相应的大型实用化有限元分析程序LSVEP。分别采用反分析所得参数和室内试验确定参数对路基地表沉降和地基深层沉降进行预测,并将所得结果和现场实测结果进行对比分析,结果表明:所建立的大应变黏弹塑性有限元分析方法正确;计算参数的准确选择对沉降预测精度影响很大;用反分析所得参数进行沉降预测的精度远高于正分析预测,是提高沉降预测精度的有效途径,可供类似工程借鉴。
According to the characteristics of large displacement, large strain, infiltration consolidation and time-dependent deformation of soft clay, viscoelasto-plastic model (Nishihara) was used to simulate the soil skeleton and a large-strain viscoelasto-plastic finite element formulation and iteration The algorithm of dynamic embankment construction was simulated with dynamic “dead ” “dead ” unit. The double non-linear infiltration consolidation analysis model of soft soil roadbed was established and the corresponding large-scale practical finite element analysis program LSVEP was developed. The parameters of back analysis and parameters determined by laboratory test were respectively used to predict subsidence and subsidence of roadbed. The results were compared with the measured data. The results show that the established large strain viscoelastic-plastic finite element method The correct choice of calculation parameters has a great influence on the accuracy of settlement prediction. The accuracy of settlement prediction by inverse analysis parameters is much higher than that of positive analysis and prediction, which is an effective way to improve the accuracy of settlement prediction.