Subgrade Stress Measurements under Heavy Aircraft Gear Loading at FAA National Airport Pavement Test Facility
Subgrade Stress Measurements under Heavy Aircraft Gear Loading at FAA National Airport Pavement Test Facility
复制标题
DOI：
10.1061/41104(377)62
复制
发表时间：
2010-05
期刊：
影响因子：
--
通讯作者：
N. Garg;F. Pecht;Q. Jia
中科院分区：
文献类型：
--
作者：
N. Garg;F. Pecht;Q. Jia
国家机场路面测试设施（NAPTF）是一条长274.3米（900英尺）、宽18.3米（60英尺）的全封闭测试轨道。在施工周期三（CC3），四个新的柔性路面测试项目（LFC 1至LFC 4）的建设。路面结构为常规结构，沥青表面为127 mm（5 in），碎石基层为203 mm（8 in），底基层厚度不同，粉质粘土路基为3至4 CBR。测试项目被命名为LFC1（最薄底基层）至LFC4（最厚底基层）。交通测试进行了6轮加载在一个轮距和4轮加载在其他轮距。车辙深度和轮廓的测量在沥青路面上进行交通试验。在测试过程中，对流量应用了固定的漫游模式。漫游模式由66次重复组成，33次向东行进，33次向西行进。传感器被嵌入到路面层中，以测量路面对施加的载荷的响应，包括沥青应变计（ASG）、多深度弯沉仪（MDD）和土压力传感器（PC）。路基压力传感器（2英寸，Kulite）仅放置在测试项目LFC 4中，并放置在路基表面以下10 cm（4英寸）和43 cm（17英寸）处。本文总结了6轮和4轮起落架在245 kN（55，000 lb）和289 kN（65，000 lb）轮载下不同漂移位置的地基垂直应力测量结果。在交通测试结束时，没有证据表明LFC 4发生结构故障。
The National Airport Pavement Test Facility (NAPTF) is a fully enclosed instrumented test track 274.3 m (900 ft) long by 18.3 m (60 ft) wide. In construction cycle three (CC3), four new flexible pavement test items (LFC1 through LFC4) were constructed. The pavement structures were of conventional construction with 127-mm (5-in) asphalt surface, 203-mm (8-in) crushed stone base, varying subbase thickness, and a silty clay subgrade of 3 to 4 CBR. The test items were named LFC1 (thinnest subbase) through LFC4 (thickest subbase). Traffic tests were performed with 6-wheel loading in one wheel track and 4-wheel loading in the other wheel track. Rut depth and profile measurements were made on the asphalt surface during traffic testing. A fixed wander pattern was applied to the traffic during the tests. The wander pattern consisted of 66 repetitions, 33 traveling east and 33 traveling west. Sensors were embedded into the pavement layers to measure the pavement response to applied loads and included asphalt strain gages (ASG), multiple depth deflectometers (MDD), and soil pressure cells (PC). Subgrade pressure cells (2 inches, Kulite) were placed only in test item LFC4 and were placed 10 cm (4 inches) and 43 cm (17 inches) below the subgrade surface. This paper summarizes the subgrade vertical stress measurements under 6-wheel and 4-wheel landing gears at 245 kN (55,000 lb) and 289 kN (65,000 lb) wheel loads at different wander positions. There was no evidence of structural failure in LFC4 at the end of traffic testing.