轮胎与格室加筋路堤性能及承载力研究

为研究废旧轮胎与土工格室加筋路堤边坡的性能,分别对废旧轮胎、土工格室加筋路堤边坡开展了室内模型试验,并考虑了填料两种不同相对密度的影响。试验结果表明:相对素土路堤而言,废旧轮胎和土工格室加筋路堤均能有效地提高承载力,增强其稳定性,减小不均匀沉降。加筋后均有效地增大了附加应力的扩散角,使得附加应力分布更为均匀,并且素土路堤与加筋路堤中轴线上附加应力差值随路堤深度增大而减小。中轴线以外的质点侧向位移随路堤深度的增加,呈现出先增大后减小的趋势,几种路堤中,废旧轮胎加筋路堤侧向位移最小。加筋效果随相对密度增大而减小,在低相对密度条件下,加筋后承载力能达到素土路堤2倍以上,而在高相对密度下却不足2倍。最后根据土工格室加筋地基承载力计算方法及对废旧轮胎加筋机理分析,提出了关于废旧轮胎加筋地基承载力计算方法。

Performance and bearing capacity of embankments reinforced with waste tires and geocells

In order to investigate the performance of with embankment slopes reinforced waste tires and geocells, the model tests on reinforced the embankment slopes with waste tires and geocells are carried out respectively, and the two different relative densities are considered. The results show that compared with the unreinforced soil embankment, the embankments reinforced with both waste tires and geocells can evidently improve bearing capacity and stability and reduce uneven settlement. The reinforced embankments effectively increase the diffusion angle of the additional stress, which makes the distribution of the additional stress become more uniform, and the difference between the additional stress on the center axis of the unreinforced soil embankment and that of the reinforced embankments decreases with the increase of the depth of embankment. The lateral displacements of the unreinforced and reinforced embankments firstly increase and then decrease with the increase of the depth of embankment, and the lateral displacement of the embankment with waste tires is the smallest. The reinforcement effect of waste tires and geocells decreases with the increase of the relative density, and the bearing capacity of the reinforced embankment is over 2 times higher than that of the unreinforced soil embankment under lower density, but less than 2 times under higher density. Finally, the relevant method for calculating bearing capacity of waste tires-reinforced foundation is proposed based on the method for calculating bearing capacity of geocell-reinforced foundation and the analysis of the reinforcement mechanism of waste tires.