高填方路堤粘弹性参数反演与工后沉降预测分析

BACK-ANALYSIS OF VISCO-ELASTIC PARAMETERS OF FILLING MATERIALS AND SETTLEMENT PREDICTION FOR HIGH-FILLED EMBANKMENT

路面的工后沉降问题是高填方路堤工程的主要问题之一。用广义Kelvin模型来表征填筑体的本构关系,在现场沉降监测资料的基础上,运用三维有限元正交数值试验、回归分析和优化相结合的方法,反演了计算模型的材料参数,并在此基础上对高填方路堤的工后沉降作出预测,得到了较高的计算精度,并和实际监测结果比较一致。本文的方法可为今后高填方路堤的工后沉降计算提供参考。

Settlement after construction is one primary problem of high-filled embankment. In this paper a method of prediction for settlement after construction was developed. A general Kelvin model was adopted to depict constitutive relationship of filling material. The bottleneck of the problem is how to obtain reliable material parameters for numerical calculations. Based on field monitoring data, back analysis approach using a 3D FEM method, an orthogonal numerical experiment, and a regression and optimization analysis was conducted to calculate the visco-elastic parameters. With these calibrated parameters, the settlement after construction of a 37 m high-filled highway embankment was predicted. The results show higher accuracy and good agreement with monitoring data. The method can be used to predict settlement after construction of high-filled embankment.