拓宽路堤填土期间土工格栅的力学行为试验研究

土工格栅在道路建设工程中广泛应用,但土工格栅在路堤中的受力情况和效用发挥仍不清晰。结合广三高速公路直接拼接拓宽路堤工程,采用在土工格栅安装柔性位移计观测土工格栅应变的方法,测试分析和研究土工格栅在桩承式加筋路堤填土期间的力学行为。研究表明,对于桩承式加筋土路堤,土工格栅拉应变随填土高度增长,能有效地将荷载分散到桩体,路堤荷载作用下土工格栅横向应力分布呈现中央小、两侧大的特征,但是发生的应力和应变远小于设计值,道路扩建工程中土工格栅的材料设计具有进一步优化的可能性和必要性。

Field Test Study on the Mechanical Behavior of Geogrid on Highway Widening

Geogrid is extensively applied in highway construction,but its mechanical behavior and effect are still not clear.Based on Guangsan Highway Widening Project,the field test with displacement-meter has been executed to measure the strain of the geogrids.The results indicate that the geogrids can effectively concentrate loads on piles in filling period on a GRPS embankment,the transverse stress on the center is smaller than that on the both sides,while strain and tensile are far smaller than design.So there are possibility and necessity to optimize the design of geogrid in highway widening.