详情

Effects of Construction Installation Methods on the Design and Performance of Drilled Shaft Foundations

项目名称：	Effects of Construction Installation Methods on the Design and Performance of Drilled Shaft Foundations
摘要：	All state departments of transportation (DOTs) use the AASHTO LRFD Bridge Design Specifications as standards for design and construction of bridges in public infrastructure projects. However, various state DOTs have developed their own state-specific standards based on experience and differences in local/regional geology. For example, design of drilled shaft foundations varies widely across the United States, as do the construction methods associated therewith. This variation also extends to the various elements of the construction methods used for maintaining a stable drilled shaft excavation. Some state DOTs have been conservative in their design approach and have discounted partially or completely the estimated friction resistance for shaft installations due to concerns about the effects of the various installation methods. Different types of installation methods, use of steel casing, and/or drilling support fluid may have significant effects on geotechnical load transfer characteristics and long-term performance. During the past 40 years, design demands have increased with the magnitude of axial, lateral, and flexural loadings, in part due to larger superstructures, increased awareness to extreme events, and associated updated design codes. Concurrently, the diameter and depths to which drilled shafts can be constructed have grown substantially owing to advancements in equipment technology. As the methods and equipment have evolved, there remain concerns about how the various installation methods affect the design and long-term performance of drilled shafts. Given the widespread use of drilled shaft foundations, research is needed to study the effect of construction installation methods on design and performance. The objective of this research is to quantify the effects of construction installation methods on the design and performance of drilled shaft foundations for different subsurface conditions and geologic materials.
状态：	Proposed
资金：	600000
资助组织：	National Cooperative Highway Research Program；American Association of State Highway and Transportation Officials (AASHTO)；Federal Highway Administration
项目负责人：	McKenney, Christopher
开始时间：	20220609
主题领域：	Bridges and other structures；Construction；Design；Highways