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为了研究公路软基沉降特性,文章结合四川达渝高速公路建设工程,现场观测了填方路堤土压力、路基沉降以及空隙水压力变化情况。结果表明:路堤填方施工过程是随机增加的,引起的沉降变形规律的不确定性。路基、路堤沉降的发展过程与荷载和时间都有关系,表明土体既有压缩变形,也有固结变形和流变变形。原状地基,尤其是软基的沉降量远大于填方土体的沉降量。填方路堤土体本身的最终沉降量沿横断面是中间大、两边小。填方路堤土体的自身沉降值是下部大于上部。对于基础面积较大,软土层深度相对基础宽度不大,以一维固结理论是可靠的。
In order to study the settlement characteristics of highway soft foundation, the article combined with the Sichuan-Chongqing Expressway construction project, the site observation of the embankment earth pressure, roadbed settlement and pore water pressure changes. The results show that the embankment filling process is randomly increasing, which leads to the uncertainty of settlement deformation law. Subgrade and embankment settlement development process and load and time are related, indicating that both the soil compression deformation, but also consolidation deformation and rheological deformation. The settlement of undisturbed foundation, especially the soft foundation, is much larger than the settlement of filled soil. The final settlement of embankment soil itself is large in cross section and small on both sides. The value of embankment soils themselves is lower than the upper part. For the larger foundation area, the relative depth of soft soil depth is not large, one-dimensional consolidation theory is reliable.