登入選單
返回Google圖書搜尋
其他書名
Final Report
出版Ohio Department of Transportation, Office of Statewide Planning & Research, 2022
URLhttp://books.google.com.hk/books?id=K5Zk0AEACAAJ&hl=&source=gbs_api
註釋An increase in pile resistance over time after installation, due to an increase in soil resistance, is referred to as pile setup. Until recently, pile setup was not commonly considered in ODOT's standard driven pile design procedures. If substantial pile driving losses are encountered during pile installation, then either pile driving is stopped for some time to determine if pile setup will occur or pile length increased to reach the required ultimate bearing value which can result in substantial pile quantity overruns during construction. Realization of pile setup in design can therefore result in pile quantity savings and prevent construction delays, and also help to avoid change orders. This research project was undertaken to develop more reliable pile setup models to be used in design to better predict pile driving losses. The project involved collecting data from existing projects around the state, performing investigations at selected field sites, and conducting comprehensive data analysis to investigate the mechanism of pile setup. The main findings of this project are: 1) Existing pile setup models cannot properly predict setup observed in fine-grained Ohio soils, 2) Construction activities and pile driving sequence at project sites can significantly affect pile's resistance obtained from pile load tests, and 3) Side friction setup factors for the piles driven in fine-grained Ohio soils are about 50 to 100% more than the factors currently recommended in the ODOT Bridge Design Manual.