土工格室于砂土之承载能力及动态特性试验研究

在沙漠地带中,在路基材料缺乏的状况下,利用土工格室与现场砂土可有效提高沙漠道路的承载力,并能达到经济效益与路基的设计要求。为了解土工格室于砂土路基的加筋行为,分别进行了静态承载板载重试验与动态载重试验,探讨土工格室加筋后的承载能力与动态特性。与未加筋砂土比较,土工格室发挥良好之加筋效果,其能提高砂土的承载能力;于静态承载试验中,承载能力随着土工格室高度增加而提升,并有效减少沉降量之产生。在动态试验指出,土工格室加筋于砂土受动态反复作用下,增加土工格室高度,并不相对能提升加筋的承载成效。以动态载重试验反应公路的反复载重条件,对于沙漠公路设计使用土工格室加固路基时,得以选择具有经济效益的优化方案。

Bearing capacity and dynamic properties of sandy soil with confinement of geocells

In the desert area,due to the lack of qualified subgrade materials,the use of geocells with in-situ sand can improve the bearing capacity of the desert road.Also,the economic benefits and the design requirements for the subgrade layer can be achieved.In order to evaluate the reinforcement behavior of geocells,both static and dynamic loading tests are conducted to investigate the bearing capacity and dynamic behaviors.Compared with the unreinforced sand,the geocells significantly improve the performance of the sandy soil used in this study.In the static loading test,with the increasing height of the geocells,the subgrade gains have higher bearing capacity and lower total settlement.Under repeated loading condition,with the increasing height of the geocells,the bearing effect can not be relatively improved.The repeated loading pavement is simulated in the dynamic loading test,and the results show that the design of subgrade reinforced with geocells in desert area can be suggested to have optimization scheme of economic benefits.