Performance Evaluation of Lightweight Pavement via Geo-Centrifuge Tests
Performance Evaluation of Lightweight Pavement via Geo-Centrifuge Tests
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DOI：
10.1520/jte20150122
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发表时间：
2016-03
影响因子：
1.2
通讯作者：
Seong-Kyum Kim;Kwanho Lee
中科院分区：
文献类型：
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作者：
Seong-Kyum Kim;Kwanho Lee
在韩国很多地方，软土沥青路面非常普遍。这导致了长时间的软土处理，增加了处理成本，沥青路面的残余沉降，增加了维护成本，等等。为了克服这些问题，研究了一种新的沥青路面系统，该系统具有透水沥青表面，轻质基层混凝土和桩基础。本研究的第一个目的是评估透水沥青路面的混合料设计特性，如马歇尔稳定性、流动、空气空隙和弹性模量。研究的第二个目的是评估水、水泥、沙子和起泡剂的混合比例，以及压缩和弯曲强度。研究的第三个目标是确定桩基础的数量和每桩的间距。为了验证轻质路面体系在软土地基上的性能，进行了土工离心试验。采用1/30减轻路面系统模型，路面系统最大加速载荷为30 g。采用高岭石模拟海洋或河滨地区的高软土。确定了路面体系的沉降、桩基础的应力-应变关系和荷载-位移关系。从有限的研究来看，在软土上使用轻质路面系统可以作为软土上的一种替代施工方法，以减少传统设计和施工的挑战。
Asphalt pavements on soft soils are very common in many parts of Korea. These result in long periods of soft soil treatment, increased treatment costs, residual settlement of asphalt pavements, increased maintenance costs, and so forth. To overcome these problems, a new asphalt pavement system was studied, featuring a permeable asphalt surface, lightweight base concrete, and pile foundations. The first objective of the study was to evaluate the mix design properties of the permeable asphalt pavement, such as the Marshall stability, flow, air voids, and elastic modulus. The second objective of the study was to evaluate the mixing ratio of water, cement, sand, and the bubble foaming agent, as well as the compressible and flexural strength. The third objective of the study was to determine the number of pile foundations and the spacing of each pile. To verify the performance of lightweight pavement systems on soft soil, geo-centrifuge tests were conducted. The 1/30 reduced lightweight pavement system model was used, and a maximum 30 g of accelerated loading was applied to the pavement system. The kaolinite was used to simulate the highly soft soils at ocean or riverside areas. The settlement of the pavement system and the stress-strain relationship and load-displacement of the pile foundations were determined. From the limited study, the use of lightweight pavement systems on soft soils could be an alternative construction method on soft soils to reduce the challenges of conventional design and constructions.