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软土的蠕变特性常常导致路堤出现沉降过大、甚至失稳等现象。本文采用同时考虑蠕变和固结效应的修正的广义Kelvin蠕变—固结模型,对公路软基的时效性变形进行了有限元分析。在某软基上路堤填筑工程的变形分析中,该方法的计算结果和监测数据基本吻合,由此验证了该模型的有效性。本文针对该工程进行了一系列的参数分析,讨论了软土的蠕变效应、塑料排水板布置方式和堆载速率等因素对该路堤变形发展和路堤稳定性的影响。
Creep characteristics of soft soil often lead to embankment settlement appears too large, or even instability and so on. In this paper, the modified generalized Kelvin creep-consolidation model, which considers both creep and consolidation effects, is used to analyze the time-dependent deformation of highway soft ground. In the deformation analysis of a embankment filling project on a soft foundation, the calculated results of the method are in good agreement with the monitoring data, and the validity of the model is verified. In this paper, a series of parametric analysis of the project was carried out. The creep effect of soft soil, the arrangement of plastic drainage board and the stacking speed on the deformation of embankment and the stability of embankment were discussed.