土工网在桥头引道路堤中的应用研究

Application of Geogrid in Embankment of Bridge-approach

关键词:  桥头引道  加筋路堤  土工网  路基土  道路  桥头跳车  路面  土压力  地基  摩阻力

Key words:  geogrid,embankment,bridge-approach,bumping at the bridge-head

摘要:

以室内试验研究了路基土与土工网之间的综合摩阻力、张力膜效应及不同土工网铺设间距对复合土反应模量的影响，并依托上海市城市外环线1期工程，研究了桥头引道加筋路堤和不加筋路堤的地基顶面垂直土压力、水平土压力、地基顶面沉降、路堤坡脚侧向位移和路面工后沉降等．结果表明，将土工网加筋路堤用于解决桥头跳车效果明显。

Abstract:

The mechanical properties of geogrid-reinforced embankment including tensile membrane effect, the compositive friction between the subgrade soils and geogrid and the reaction modulus of reinforced composite soils were studied in laboratory test. To investigate the effect of the application of geogrid-reinforced embankment, some bridge-approachs in Shanghai Outer-ring Road engineering were chosen to test. It is shown that settlement and the earth pressure on the top of the foundation decreases greatly after using geogrid-reinforced embankment, and the settlement after construction on the road surface also becomes quite small. The result indicates that the use of geogrid-reinforced embankment could reduce the bumping at the bridge-head distinctly.