填方路基不均匀沉降模式及其成因机制

Uneven Settlement Pattern of Fill Subgrade and Its Formation Mechanism

在山区和多丘陵地区多采用挖方土石混合料填筑路基,并且形成高路堤。因此在路基的自重荷载和行车荷载共同作用下,经常出现路基的整体下沉或部分下沉,特别是一些填挖接头和桥台处,路基不均匀沉降特别突出。经过大量的实际调查以及实验,归纳起来填方路基的不均匀沉降主要有四种基本模式:路基填方压实度不足;地基中存在软弱土层;路基刚度差异过大;填充物成分不均匀。

In mountain and hilly area,excavated soil and rocks mixture are usually used to fill subgrade and form high embankment.Under the combined action of deadweight load of subgrade and traffic load,the overall or part subsidence of subgrade often appear,the uneven settlement of subgrade is very obvious especially at the joints of excavation and filling or abutments.Through lots of practical investigation and experiments,it is summed up that there are four basic mode of uneven settlement of excavated subgrade as follows： insufficiency of compaction of subgrade excavation,there are soft soil existing in foundation,too much difference between subgrade′s stiffness,uneven component of filling.