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根据现场勘察成果,柳林江大桥南段公路旧路拓宽工程的软土工程力学性质差,且分布广泛,厚度较大。道路回填时,随着时间及上部荷载的增长,不均匀沉降会加剧。为了保证工程安全和施工进度,需对路基处治做出优化及并预测工后沉降。本文对柳林江大桥南段公路软土旧路拓宽所采用的反压护道处治方案做出数值模拟和优化,应用Flac二次开发得到的广义Bingham体流变本构模型预测路基的工后沉降。结果表明,广义Bingham体模型能够很好地模拟柳林江软土的早期流变过程,能准确反映其软土路基的早期流变特性。
According to the results of on-site survey, the soft soil engineering of widening the old road in southern section of Liulin River Bridge has poor mechanical properties and is widely distributed and large in thickness. When the road backfill, as time and the upper load increases, uneven settlement will increase. In order to ensure the safety of the project and the construction progress, it is necessary to optimize the roadbed treatment and predict the post-construction settlement. This paper numerically simulates and optimizes the treatment scheme for the anti-pressure protection road used to widen the old soft soil section of the southern section of the Liulin River Bridge. The generalized Bingham body rheological constitutive model obtained by Flac’s secondary development is used to predict the post-construction settlement of the subgrade. The results show that the generalized Bingham body model can well simulate the early rheological process of the soft soil in Liulin River and accurately reflect the early rheological properties of the soft soil subgrade.