蠕变土工格栅加筋砂垫层承载力试验研究

Experimental study on load bearing of creep geogrid reinforced cushion

为了探究土工格栅的蠕变性能对加紧砂垫层承载力的影响,本文采用大型土工槽对不同抗拉强度的双向土工格栅开展无侧限蠕变试验及加筋土模型试验,对比了土工格栅蠕变前后的加筋砂土地基的承载特性。试验结果表明:土工格栅的加入将提高地基承载力,在长期荷载作用下,应考虑土工格栅蠕变对地基承载特性带来的影响。土工格栅在加载初期的蠕变效应对加筋地基沉降影响不大,当荷载超过承载力影响初始荷载时,土工格栅开始出现蠕变效应。

In order to research the influence of the creep performance of geogrid on the bearing capacity of reinforced sand cushion,the unconfined creep test and reinforced soil model test were carried out by using large-scale geogrid with different tensile strength,and the bearing characteristics of reinforced sand foundation before and after the creep of geogrid were compared.The test results show that the addition of geogrid can improve the bearing capacity of foundation,and the influence of geogrid creep on the bearing characteristics of foundation should be considered under long-term load.The creep effect of geogrid has little effect on the settlement of reinforced foundation at the initial stage of loading.When the load exceeds the bearing capacity,the creep effect of geogrid begins to appear.