条形荷载下土工格室加筋砂土路堤模型试验研究

Model tests on sand embankment reinforced with geocell subjected to strip loading

为了探讨不同土工格室加筋方式对路堤应力变形特性和不均匀沉降的控制效果,分别对纯砂路堤边坡和土工格室加筋路堤进行多组模型试验,研究了土工格室焊距、埋深、加筋层数以及压实度对路堤承载力特性和变形特性的影响,同时结合土工格室材料应变的变化规律和加筋路堤的坡面变形状态分析了土工格室加筋路堤的破坏模式。试验结果表明:格室加筋效果随着焊距、加筋深度的减小而增加,随着压实度、加筋层数的增加而增加;土工格室加筋路堤承载力是纯砂的2.5倍左右,提高了路堤的极限承载力,减小了路堤沉降,并且土工格室加筋路堤坡面侧向位移比纯砂路堤减小了75%。

A series of model tests are carried out on pure embankment and reinforced embankment with geocell to study the effect of the different reinforced types of geocell on variation characteristic of stress and differential settlement in embankment. The influences of welded spacing, single-layer reinforcement depth, reinforcement layers and soil compaction on the bearing capacity and deformation of the embankment are investigated. At the same time, the failure mode of reinforced embankment is analyzed according to the distribution of tensile strain of geocell and the failure state of embankment slope. The results show that the effect of reinforcement increases with the decrease of geocell welded spacing and single-layer geocell depth, moreover, the effect of reinforcement increases with the increase of reinforcement layers and the embankment compaction. The bearing capacity of reinforcement embankment is about 2.5 times that of the pure sand, improves the bearing capacity and reduces the settlement of reinforcement embankment, and the lateral displacement of embankment slope is reduced by 75% than that of the pure sand embankment.