土工格栅在加固高速公路路堤中的应用研究

土工格栅应用到高速公路路基中，对土性参数c，? 值有不同程度的改善作用，在一定程度上解决了特殊土的施工问题。土工格栅蠕变试验表明，在相同荷载作用下，强度大的格栅应变较小；并且荷载变化及温度大小对格栅流变性有显著影响。有限元分析是研究加筋作用效果的一种有效方法，它可定性比较多种加筋方案的优劣。利用PLAXIS有限元模拟不同工况下的沉降量，表明土工格栅在限制水平方向位移比限制垂直方向位移更有效。现场荷载试验表明，土工格栅加筋能使路基承载力成倍提高，改善土体应力环境，有效地均衡差异沉降和减少总沉降量。土工格栅对路堤加固有显著作用，值得在实际工程中广泛应用。

Study on using geogrids to reinforce embankment of expressway

Geogrids are used in the embankment of expressway to solve the construction problem of special soil in a certain extent for it can improve the indexes of soil, e.g. c and ?. Based on creep experiments for geogrids, it is shown that the bigger intensity geogrids have smaller strain under the same load action; and load and temperature have remarkable impact on the rheology of geogrids. Finite element method is effective to study the effect of geogrids on reinforcing soil; and the advantages and disadvantages of multifarious schemes can be compared conveniently. FEM(PLAXIS) is used to simulate the settlements under several different working states. The results indicate that the geogrids to control horizontal displacements is better than to control vertical displacement. The field load tests show that geogrids can boost bearing capacity of the road embankment severalfold , improve stress condition of soil, reduce differential settlements and total settlements effectively. Geogrids are good for reinforcing the road embankment observably and will be used in the practical engineering widely.