泡沫轻质土格栅加筋路堤室内足尺模型试验研究

Research on Indoor Full-scale Model Test for Foam Lightweight Geogrid Reinforced Embankment

为了揭示泡沫轻质土格栅加筋路堤的沉降及稳定性特征,制作室内足尺模型,对路堤温度、土压力、沉降进行监测并分析,得出如下结论:(1)浇筑后24h内,泡沫轻质土路堤内部温度可升高至73℃;路基中心线处为水化热集中区域,应在48h内采取养护及散热措施降低温度;(2)路堤沉降随时间逐渐增大,但总体沉降量较小,220d累计沉降约8mm;(3)土工格栅对于平缓泡沫轻质土路堤沉降曲线具有一定作用,但对总体沉降量的影响不明显;(4)铺筑土工格栅能够降低泡沫轻质土路基的土压力值,铺设格栅的位置升高,土压力分散效果仍显著。

In order to reveal the settlement and stability characteristics of foam lightweight geogrid reinforced embankment,the indoor full-scale model is made to monitor and analyze the embankment temperature,earth pressure and settlement,and the following conclusions are drawn:(1)Within 24 hours after pouring,the internal temperature of foam lightweight soil embankment can rise to 73℃;The centerline of the subgrade is a concentrated area of hydration heat,and the maintenance and heat dissipation measures should be taken within 48 hours to reduce the temperature;(2)The settlement of the embankment gradually increases over time,but the overall settlement is relatively small,with a cumulative settlement of about 8mm after 220 days;(3)Geogrid has a certain effect on the settlement curve of gentle foam lightweight soil embankment,but has no obvious effect on the overall settlement;(4)Paving geogrid can reduce the earth pressure value of foam lightweight soil subgrade.When the geogrid is placed at a higher position,the earth pressure dispersion effect is still significant.